期刊文献+
共找到964篇文章
< 1 2 49 >
每页显示 20 50 100
Design of a 3D-printed liquid lithium divertor target plate and its interaction with high-density plasma
1
作者 苑聪聪 叶宗标 +9 位作者 刘建星 郭恒鑫 彭怡超 廖加术 陈波 陈建军 王宏彬 韦建军 张秀杰 芶富均 《Plasma Science and Technology》 SCIE EI CAS CSCD 2024年第8期112-120,共9页
A liquid Li divertor is a promising alternative for future fusion devices.In this work a new divertor model is proposed,which is processed by 3D-printing technology to accurately control the size of the internal capil... A liquid Li divertor is a promising alternative for future fusion devices.In this work a new divertor model is proposed,which is processed by 3D-printing technology to accurately control the size of the internal capillary structure.At a steady-state heat load of 10 MW m^(-2),the thermal stress of the tungsten target is within the bearing range of tungsten by finite-element simulation.In order to evaluate the wicking ability of the capillary structure,the wicking process at 600℃ was simulated by FLUENT.The result was identical to that of the corresponding experiments.Within 1 s,liquid lithium was wicked to the target surface by the capillary structure of the target and quickly spread on the target surface.During the wicking process,the average wicking mass rate of lithium should reach 0.062 g s^(-1),which could even supplement the evaporation requirement of liquid lithium under an environment>950℃.Irradiation experiments under different plasma discharge currents were carried out in a linear plasma device(SCU-PSI),and the evolution of the vapor cloud during plasma irradiation was analyzed.It was found that the target temperature tends to plateau despite the gradually increased input current,indicating that the vapor shielding effect is gradually enhanced.The irradiation experiment also confirmed that the 3D-printed tungsten structure has better heat consumption performance than a tungsten mesh structure or multichannel structure.These results reveal the application potential and feasibility of a 3D-printed porous capillary structure in plasma-facing components and provide a reference for further liquid-solid combined target designs. 展开更多
关键词 fusion DIVERTOR 3d-printing TUNGSTEN LITHIUM liquid metal
下载PDF
3D-Printed MOF Monoliths:Fabrication Strategies and Environmental Applications
2
作者 Hossein Molavi Kamyar Mirzaei +4 位作者 Mahdi Barjasteh Seyed Yahya Rahnamaee Somayeh Saeedi Aliakbar Hassanpouryouzband Mashallah Rezakazemi 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第12期358-405,共48页
Metal-organic frameworks(MOFs)have been extensively considered as one of the most promising types of porous and crystalline organic-inorganic materials,thanks to their large specific surface area,high porosity,tailora... Metal-organic frameworks(MOFs)have been extensively considered as one of the most promising types of porous and crystalline organic-inorganic materials,thanks to their large specific surface area,high porosity,tailorable structures and compositions,diverse functionalities,and well-controlled pore/size distribution.However,most developed MOFs are in powder forms,which still have some technical challenges,including abrasion,dustiness,low packing densities,clogging,mass/heat transfer limitation,environmental pollution,and mechanical instability during the packing process,that restrict their applicability in industrial applications.Therefore,in recent years,attention has focused on techniques to convert MOF powders into macroscopic materials like beads,membranes,monoliths,gel/sponges,and nanofibers to overcome these challenges.Three-dimensional(3D)printing technology has achieved much interest because it can produce many high-resolution macroscopic frameworks with complex shapes and geometries from digital models.Therefore,this review summarizes the combination of different 3D printing strategies with MOFs and MOF-based materials for fabricating 3D-printed MOF monoliths and their environmental applications,emphasizing water treatment and gas adsorption/separation applications.Herein,the various strategies for the fabrication of 3D-printed MOF monoliths,such as direct ink writing,seed-assisted in-situ growth,coordination replication from solid precursors,matrix incorporation,selective laser sintering,and digital light processing,are described with the relevant examples.Finally,future directions and challenges of 3D-printed MOF monoliths are also presented to better plan future trajectories in the shaping of MOF materials with improved control over the structure,composition,and textural properties of 3D-printed MOF monoliths. 展开更多
关键词 MOFS 3d-printing Environmental remediation SHAPING MONOLITHS
下载PDF
Cover crops,crop rotation,and gypsum,as conservation practices,impact Mehlich-3 extractable plant nutrients and trace metals
3
作者 Javier M.Gonzalez Warren A.Dick +7 位作者 Khandakar R.Islam Dexter B.Watts Norman R.Fausey Dennis C.Flanagan Marvin T.Batte Tara T.VanToai Randall C.Reeder Vinayak S.Shedekar 《International Soil and Water Conservation Research》 SCIE CSCD 2024年第3期650-662,共13页
Conservation practices are encouraged to improve soil health and sustain agronomic crop production.Mehlich-3 is often used as a multi-nutrient extractant to determine soil fertility status.A study inves-tigated the im... Conservation practices are encouraged to improve soil health and sustain agronomic crop production.Mehlich-3 is often used as a multi-nutrient extractant to determine soil fertility status.A study inves-tigated the impacts of the conservation practices of gypsum,cover crops,and crop rotation on 28 Mehlich-3 extractable elements,of which 11 were considered plant nutrients,from soil at three mid-western US locations.Soil was collected from 0 to 15 and 15-30 cm depths 5 years after implementing the conservation practices.Treatments consisted of(1)with and without cereal rye(Secale cereale L.)winter cover,(2)continuous soybean[Glycine max(L.)Merr.]vs.soybean-corn(Zea mays L.)rotation,and(3)annual gypsum application(0,1.1,and 2.2 Mg ha-1).Differences were observed by site,depth,and conservation practice depending on the element evaluated.Minimal interactive effects were observed among treatments.The most consistent effect was observed for crop rotation across sites.Gypsum only affected the site with the greatest clay content,where more Ca and S were retained,and Mg and Mn displaced.Cover crop only affected elements at this high clay site,where different elements were positively or negatively affected.Results suggest that not one practice fits all,and optimum conservation practices must be tailored for the site. 展开更多
关键词 GYPSUM Cover crops Crop rotation Mehlich-3 Plant nutrients Trace metals
原文传递
3D printing of poly(ethyleneimine)-functionalized Mg-Al mixed metal oxide monoliths for direct air capture of CO_(2)
4
作者 Qingyang Shao Zhuozhen Gan +4 位作者 Bingyao Ge Xuyi Liu Chunping Chen Dermot O’Hare Xuancan Zhu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第9期491-500,共10页
Direct air capture(DAC)of CO_(2)plays an indispensable role in achieving carbon-neutral goals as one of the key negative emission technologies.Since large air flows are required to capture the ultradilute CO_(2)from t... Direct air capture(DAC)of CO_(2)plays an indispensable role in achieving carbon-neutral goals as one of the key negative emission technologies.Since large air flows are required to capture the ultradilute CO_(2)from the air,lab-synthesized adsorbents in powder form may cause unacceptable gas pressure drops and poor heat and mass transfer efficiencies.A structured adsorbent is essential for the implementation of gas-solid contactors for cost-and energy-efficient DAC systems.In this study,efficient adsorbent poly(ethyleneimine)(PEI)-functionalized Mg-Al-CO_(3)layered double hydroxide(LDH)-derived mixed metal oxides(MMOs)are three-dimensional(3D)printed into monoliths for the first time with more than 90%adsorbent loadings.The printing process has been optimized by initially printing the LDH powder into monoliths followed by calcination into MMO monoliths.This structure exhibits a 32.7%higher specific surface area and a 46.1%higher pore volume,as compared to the direct printing of the MMO powder into a monolith.After impregnation of PEI,the monolith demonstrates a large adsorption capacity(1.82 mmol/g)and fast kinetics(0.7 mmol/g/h)using a CO_(2)feed gas at 400 ppm at 25℃,one of the highest values among the shaped DAC adsorbents.Smearing of the amino-polymers during the post-printing process affects the diffusion of CO_(2),resulting in slower adsorption kinetics of pre-impregnation monoliths compared to post-impregnation monoliths.The optimal PEI/MeOH ratio for the post-impregnation solution prevents pores clogging that would affect both adsorption capacity and kinetics. 展开更多
关键词 3D printing Mixed metal oxides Amine functionalization Structured adsorbent Direct air capture
下载PDF
Controllable rectification on the thermal conductivity of porous YBa_(2)Cu_(3)O_(7−x) superconductors from 3D-printing 被引量:1
5
作者 Yanbin Ma Baoqiang Zhang +1 位作者 Xingyi Zhang You-He Zhou 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2023年第1期182-191,共10页
Superconducting YBa_(2)Cu_(3)O_(7−x)(YBCO)bulks have promising applications in quasi-permanent magnets,levitation,etc.Recently,a new way of fabricating porous YBCO bulks,named direct-ink-writing(DIW)3D-printing method... Superconducting YBa_(2)Cu_(3)O_(7−x)(YBCO)bulks have promising applications in quasi-permanent magnets,levitation,etc.Recently,a new way of fabricating porous YBCO bulks,named direct-ink-writing(DIW)3D-printing method,has been reported.In this method,the customized precursor paste and programmable shape are two main advantages.Here,we have put forward a new way to customize the YBCO 3D-printing precursor paste which is doped with Al_(2)O_(3)nanoparticles to obtain YBCO with higher thermal conductivity.The great rheological properties of precursor paste after being doped with Al_(2)O_(3)nanoparticles can help the macroscopic YBCO samples with high thermal conductivity fabricated stably with high crystalline and lightweight properties.Test results show that the peak thermal conductivity of Al_(2)O_(3)-doped YBCO can reach twice as much as pure YBCO,which makes a great effort to reduce the quench propagation speed.Based on the microstructure analysis,one can find that the thermal conductivity of Al_(2)O_(3)-doped YBCO has been determined by its components and microstructures.In addition,a macroscopic theoretical model has been proposed to assess the thermal conductivity of different microstructures,whose calculated results take good agreement with the experimental results.Meanwhile,a microstructure with high thermal conductivity has been found.Finally,a macroscopic YBCO bulk with the presented high thermal conductivity microstructure has been fabricated by the Al_(2)O_(3)-doped method.Compared with YBCO fabricated by the traditional 3D-printed,the Al_(2)O_(3)-doped structural YBCO bulks present excellent heat transfer performances.Our customized design of 3D-printing precursor pastes and novel concept of structural design for enhancing the thermal conductivity of YBCO superconducting material can be widely used in other DIW 3D-printing materials. 展开更多
关键词 Al_(2)O_(3)-doped YBCO thermal conductivity theoretical model controllable design DIW 3d-printing
下载PDF
Advances in noble metal-modified g-C_(3)N_(4) heterostructures toward enhanced photocatalytic redox ability
6
作者 Xiao Zhang Ping Yang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第11期2368-2389,共22页
The photocatalytic activity of catalysts depends on the energy-harvesting ability and the separation or transport of photogenerated carriers.The light absorption capacity of graphitic carbon nitride(g-C_(3)N_(4))-base... The photocatalytic activity of catalysts depends on the energy-harvesting ability and the separation or transport of photogenerated carriers.The light absorption capacity of graphitic carbon nitride(g-C_(3)N_(4))-based composites can be enhanced by adjusting the surface plasmon resonance(SPR)of noble metal nanoparticles(e.g.,Cu,Au,and Pd)in the entire visible region.Adjustments can be carried out by varying the nanocomponents of the materials.The SPR of noble metals can enhance the local electromagnetic field and improve interband transition,and resonant energy transfer occurs from plasmonic dipoles to electron-hole pairs via near-field electromagnetic interactions.Thus,noble metals have emerged as relevant nanocomponents for g-C_(3)N_(4) used in CO_(2) photoreduction and water splitting.Herein,recent key advances in noble metals(either in single atom,cluster,or nanoparticle forms)and composite photocatalysts based on inorganic or organic nanocomponent-incorporated g-C_(3)N_(4) nanosheets are systematically discussed,including the applications of these photocatalysts,which exhibit improved photoinduced charge mobility in CO_(2) photoconversion and H2 production.Issues related to the different types of multi-nanocomponent heterostructures(involving Schottky junctions,Z-/S-scheme heterostructures,noble metals,and additional semiconductor nanocomponents)and the adjustment of dimensionality of heterostructures(by incorporating noble metal nanoplates on g-C_(3)N_(4) forming 2D/2D heterostructures)are explored.The current prospects and possible challenges of g-C_(3)N_(4) composite photocatalysts incorporated with noble metals(e.g.,Au,Pt,Pd,and Cu),particularly in water splitting,CO_(2) reduction,pollution degradation,and chemical conversion applications,are summarized. 展开更多
关键词 g-C_(3)N_(4) HETEROSTRUCTURE noble metal PHOTOCATALYSIS H_(2)generation CO_(2)
下载PDF
Ti_(3)C_(2)T_(x)超薄纳米片高效率去除废水中重金属的研究
7
作者 于雪荣 姜健 +3 位作者 王秀莉 陈元元 刘惠 陈宁宁 《化学试剂》 CAS 2024年第1期69-75,共7页
通过刻蚀剥离法制备了Ti_(3)C_(2)T_(x)超薄纳米片,探究了其对废水中重金属离子的吸附特性。通过SEM、XRD、AFM、FT-IR、Raman对Ti_(3)C_(2)T_(x)超薄纳米片的形貌和结构进行了表征,通过ICP-MS对处理前后水体中重金属离子的含量进行了... 通过刻蚀剥离法制备了Ti_(3)C_(2)T_(x)超薄纳米片,探究了其对废水中重金属离子的吸附特性。通过SEM、XRD、AFM、FT-IR、Raman对Ti_(3)C_(2)T_(x)超薄纳米片的形貌和结构进行了表征,通过ICP-MS对处理前后水体中重金属离子的含量进行了测试。结果表明剥离的Ti_(3)C_(2)T_(x)超薄纳米片表面含有结构缺陷和羟基,当水体中Cu(Ⅱ)、Pb(Ⅱ)、Cr(Ⅵ)初始浓度为50 mg/L时,47.5 mg Ti_(3)C_(2)T_(x)超薄纳米片对其的去除效率高达90%以上,尤其是对Pb(Ⅱ)的去除效率达到了98.81%,吸附性能远高于大孔树脂、硅藻土和活性炭等常见吸附试剂。在Na(Ⅰ)、Cu(Ⅱ)、Pb(Ⅱ)、Cr(Ⅵ)4种离子共存溶液中,Ti_(3)C_(2)T_(x)超薄纳米片对于Pb(Ⅱ)和Cr(Ⅵ)的去除依然可以达到92%以上。通过动力学和吸附等温拟合,Ti_(3)C_(2)T_(x)纳米片对Pb(Ⅱ)的吸附符合拟二级动力学模型和Langmuir等温模型,对Pb(Ⅱ)的最大吸附量和最低检出限分别为81.7 mg/g和0.0094 mg/L。Ti_(3)C_(2)T_(x)超薄纳米片对重金属离子的吸附特性在化学工业、食品加工的废水处理中具有良好的应用前景。 展开更多
关键词 Ti_(3)C_(2)T_(x) 超薄纳米片 重金属离子 刻蚀剥离 吸附
下载PDF
In situ generation of Li_(3)N concentration gradient in 3D carbon-based lithium anodes towards highly-stable lithium metal batteries 被引量:4
8
作者 Wenzhu Cao Weimin Chen +4 位作者 Mi Lu Cheng Zhang Du Tian Liang Wang Faquan Yu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第1期648-656,I0016,共10页
The uncontrolled dendrite growth of lithium metal anodes(LMAs)caused by unstable anode/electrolyte interface and uneven lithium deposition have impeded the practical applications of lithium metal batteries(LMBs).Const... The uncontrolled dendrite growth of lithium metal anodes(LMAs)caused by unstable anode/electrolyte interface and uneven lithium deposition have impeded the practical applications of lithium metal batteries(LMBs).Constructing a robust artificial solid electrolyte interphase(SEI)and regulating the lithium deposition behavior is an effective strategy to address these issues.Herein,a three-dimensional(3D)lithium anode with gradient Li_(3)N has been in-situ fabricated on carbon-based framework by thermal diffusion method(denoted as CC/Li/Li_(3)N).Density functional theory(DFT)calculations reveal that Li_(3)N can effectively promote the transport of Li^(+)due to the low energy barrier of Li^(+)diffusion.As expected,the Li_(3)N-rich conformal artificial SEI film can not only effectively stabilize the interface and avoid parasitic reactions,but also facilitate fast Li^(+)transport across the SEI layer.The anode matrix with uniformly distributed Li3N can enable homogenous deposition of Li,thus preventing Li dendrite propagation.Benefiting from these merits,the CC/Li/Li_(3)N anode achieves ultralong-term cycling for>1000 h at a current density of 2 m A cm^(-2)and dendrite-free Li deposition at an ultrahigh rate of 20 m A cm^(-2).Moreover,the full cells coupled with LiFePO4cathodes show extraordinary cycling stability for>300 cycles in liquidelectrolyte-based batteries and display a high-capacity retention of 96.7%after 100 cycles in solid-state cells,demonstrating the promising prospects for the practical applications of LMBs. 展开更多
关键词 Li_(3)N GRADIENT Three-dimensional host INTERPHASE Lithium metal anode
下载PDF
3D Artificial Array Interface Engineering Enabling Dendrite-Free Stable Zn Metal Anode 被引量:2
9
作者 Jianbin Ruan Dingtao Ma +6 位作者 Kefeng Ouyang Sicheng Shen Ming Yang Yanyi Wang Jinlai Zhao Hongwei Mi Peixin Zhang 《Nano-Micro Letters》 SCIE EI CAS CSCD 2023年第3期112-128,共17页
The ripple effect induced by uncontrollable Zn deposition is considered as the Achilles heel for developing high-performance aqueous Zn-ion batteries.For this problem,this work reports a design concept of 3D artificia... The ripple effect induced by uncontrollable Zn deposition is considered as the Achilles heel for developing high-performance aqueous Zn-ion batteries.For this problem,this work reports a design concept of 3D artificial array interface engineering to achieve volume stress elimination,preferred orientation growth and dendrite-free stable Zn metal anode.The mechanism of MXene array interface on modulating the growth kinetics and deposition behavior of Zn atoms were firstly disclosed on the multi-scale level,including the in-situ optical microscopy and transient simulation at the mesoscopic scale,in-situ Raman spectroscopy and in-situ X-ray diffraction at the microscopic scale,as well as density functional theory calculation at the atomic scale.As indicated by the electrochemical performance tests,such engineered electrode exhibits the comprehensive enhancements not only in the resistance of corrosion and hydrogen evolution,but also the rate capability and cyclic stability.High-rate performance(20 mA cm^(-2))and durable cycle lifespan(1350 h at 0.5 mA cm^(-2),1500 h at 1 mA cm^(-2)and 800 h at 5 mA cm^(-2))can be realized.Moreover,the improvement of rate capability(214.1 mAh g^(-1)obtained at 10 A g^(-1))and cyclic stability also can be demonstrated in the case of 3D MXene array@Zn/VO2battery.Beyond the previous 2D closed interface engineering,this research offers a unique 3D open array interface engineering to stabilize Zn metal anode,the controllable Zn deposition mechanism revealed is also expected to deepen the fundamental of rechargeable batteries including but not limited to aqueous Zn metal batteries. 展开更多
关键词 Aqueous Zn-ion batteries Volume stress 3D artificial array interface Controllable deposition Zn metal anode
下载PDF
A Generalized Polymer Precursor Ink Design for 3D Printing of Functional Metal Oxides 被引量:1
10
作者 Hehao Chen Jizhe Wang +7 位作者 Siying Peng Dongna Liu Wei Yan Xinggang Shang Boyu Zhang Yuan Yao Yue Hui Nanjia Zhou 《Nano-Micro Letters》 SCIE EI CAS CSCD 2023年第10期433-448,共16页
Three-dimensional-structured metal oxides have myriad applications for optoelectronic devices.Comparing to conventional lithography-based manufacturing methods which face significant challenges for 3D device architect... Three-dimensional-structured metal oxides have myriad applications for optoelectronic devices.Comparing to conventional lithography-based manufacturing methods which face significant challenges for 3D device architectures,additive manufacturing approaches such as direct ink writing offer convenient,on-demand manufacturing of 3D oxides with high resolutions down to sub-micrometer scales.However,the lack of a universal ink design strategy greatly limits the choices of printable oxides.Here,a universal,facile synthetic strategy is developed for direct ink writable polymer precursor inks based on metal-polymer coordination effect.Specifically,polyethyleneimine functionalized by ethylenediaminetetraacetic acid is employed as the polymer matrix for adsorbing targeted metal ions.Next,glucose is introduced as a crosslinker for endowing the polymer precursor inks with a thermosetting property required for 3D printing via the Maillard reaction.For demonstrations,binary(i.e.,ZnO,CuO,In_(2)O_(3),Ga_(2)O_(3),TiO_(2),and Y_(2)O_(3)) and ternary metal oxides(i.e.,BaTiO_(3) and SrTiO_(3)) are printed into 3D architectures with sub-micrometer resolution by extruding the inks through ultrafine nozzles.Upon thermal crosslinking and pyrolysis,the 3D microarchitectures with woodpile geometries exhibit strong light-matter coupling in the mid-infrared region.The design strategy for printable inks opens a new pathway toward 3D-printed optoelectronic devices based on functional oxides. 展开更多
关键词 3D printing Maillard reaction Polymer-assisted deposition metal oxide Photonic crystal
下载PDF
Design,fabrication,and structural safety validation of 3D-printable biporous bone augments 被引量:1
11
作者 Yeokyung Kang Dasol Lim +2 位作者 Doo-Hoon Sun Jong-Chul Park Jungsung Kim 《Bio-Design and Manufacturing》 SCIE EI CAS CSCD 2023年第1期26-37,共12页
The use of commercial products such as a cup and liner for total hip arthroplasty for patients with severe bone defects has a high probability of failure.In these patients the cup alone cannot cover the bone defect,an... The use of commercial products such as a cup and liner for total hip arthroplasty for patients with severe bone defects has a high probability of failure.In these patients the cup alone cannot cover the bone defect,and thus,an additional augment or cage is required.In this study,we designed three-dimensional(3D)printable bone augments as an alternative to surgeries using reinforcement cages.Thirty-five sharp-edged bone augments of various sizes were 3D printed.A biporous structure was designed to reduce the weight of the augment and to facilitate bone ingrowth.Two types of frames were used to prevent damage to the augment’s porous structure and maintain its stability during printing.Furthermore,two types of holes were provided for easy augment fixation at various angles.Fatigue tests were performed on a combination of worst-case sizes derived using finite element analysis.The test results confirmed the structural stability of the specimens at a load of 5340 N.Although the porosity of the specimens was measured to be 63.70%,it cannot be said that the porous nature was uniformly distributed because porosity tests were performed locally and randomly.In summary,3D-printable biporous bone augments capable of bonding from various angles and bidirectionally through angulation and bottom-plane screw holes are proposed.The mechanical results with bone augments indicate good structural safety in patients.However,further research is necessary to study the clinical applications of the proposed bone augment. 展开更多
关键词 Bone augment 3D printing Biporous structure Total hip arthroplasty metal implant
下载PDF
Novel ternary metals-based telluride electrocatalyst with synergistic effects of high valence non-3d metal and oxophilic Te for pH-universal hydrogen evolution reaction 被引量:1
12
作者 Seunghwan Jo Wenxiang Liu +5 位作者 Yanan Yue Ki Hoon Shin Keon Beom Lee Hyeonggeun Choi Bo Hou Jung Inn Sohn 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第5期736-743,I0015,共9页
Electrocatalyst designs based on oxophilic foreign atoms are considered a promising approach for developing efficient pH-universal hydrogen evolution reaction(HER)electrocatalysts by overcoming the sluggish alkaline H... Electrocatalyst designs based on oxophilic foreign atoms are considered a promising approach for developing efficient pH-universal hydrogen evolution reaction(HER)electrocatalysts by overcoming the sluggish alkaline HER kinetics.Here,we design ternary transition metals-based nickel telluride(Mo WNi Te)catalysts consisting of high valence non-3d Mo and W metals and oxophilic Te as a first demonstration of non-precious heterogeneous electrocatalysts following the bifunctional mechanism.The Mo WNi Te showed excellent HER catalytic performance with overpotentials of 72,125,and 182 mV to reach the current densities of 10,100,and 1000 mA cm^(-2),respectively,and the corresponding Tafel slope of 47,52,and 58 mV dec-1in alkaline media,which is much superior to commercial Pt/C.Additionally,the HER performance of Mo WNi Te is well maintained up to 3000 h at the current density of 100 mA cm^(-2).It is further demonstrated that the Mo WNi Te exhibits remarkable HER activities with an overpotential of 45 mV(31 mV)and Tafel slope of 60 mV dec-1(34 mV dec-1)at 10 mA cm^(-2)in neutral(acid)media.The superior HER performance of Mo WNi Te is attributed to the electronic structure modulation,inducing highly active low valence states by the incorporation of high valence non-3d transition metals.It is also attributed to the oxophilic effect of Te,accelerating water dissociation kinetics through a bifunctional catalytic mechanism in alkaline media.Density functional theory calculations further reveal that such synergistic effects lead to reduced free energy for an efficient water dissociation process,resulting in remarkable HER catalytic performances within universal pH environments. 展开更多
关键词 Telluride catalyst Oxophilic effect High valence non-3d metal Bifunctional mechanism pH-universal hydrogen evolution reaction
下载PDF
Engineering Ferroelectric Interlayer between Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3)and Lithium Metal for Stable Solid-State Batteries Operating at Room Temperature 被引量:1
13
作者 Tian Gu Likun Chen +6 位作者 Yanfei Huang Jiabin Ma Peiran Shi Jie Biao Ming Liu Wei Lu Yanbing He 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2023年第6期305-311,共7页
The poor contact and side reactions between Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3)(LATP)and lithium(Li)anode cause uneven Li plating and high interfacial impendence,which greatly hinder the practical application of LATP... The poor contact and side reactions between Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3)(LATP)and lithium(Li)anode cause uneven Li plating and high interfacial impendence,which greatly hinder the practical application of LATP in high-energy density solid-state Li metal batteries.In this work,a multifunctional ferroelectric BaTiO_(3)(BTO)/poly(vinylidene fluoride-co-trifluoroethylene-co-chlorotrifluoroethylene)(P[VDF-TrFE-CTFE])composite interlayer(B-TERB)is constructed between LATP and Li metal anode,which not only suppresses the Li dendrite growth,but also improves the interfacial stability and maintains the intimate interfacial contact to significantly decrease the interfacial resistance by two orders of magnitude.The B-TERB interlayer generates a uniform electric field to induce a uniform and lateral Li deposition,and therefore avoids the side reactions between Li metal and LATP achieving excellent interface stability.As a result,the Li/LATP@B-TERB/Li symmetrical batteries can stably cycle for 1800 h at 0.2 mA cm^(-2)and 1000 h at 0.5 mA cm^(-2).The solid-state LiFePO_(4)/LATP@B-TERB/Li full batteries also exhibit excellent cycle performance for 250 cycles at 0.5 C and room temperature.This work proposes a novel strategy to design multifunctional ferroelectric interlayer between ceramic electrolytes and Li metal to enable stable room-temperature cycling performance. 展开更多
关键词 BaTiO_(3) DENDRITES FERROELECTRIC Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3) lithium metal
下载PDF
非贵金属掺杂改性g-C_(3)N_(4)光催化分解水制氢的研究进展 被引量:1
14
作者 李苗 李欣儒 +1 位作者 武威 周远 《中国陶瓷》 CAS CSCD 北大核心 2024年第1期1-8,34,共9页
光催化裂解水产氢是缓解能源危机和环境污染两大难题最有前景的技术之一。石墨相氮化碳(g-C_(3)N_(4))以其合适的带隙宽度、丰富的活性位点和成本低廉等优点,近年已成为极具有应用前景的光催化材料。然而,单一g-C_(3)N_(4)的可见光响应... 光催化裂解水产氢是缓解能源危机和环境污染两大难题最有前景的技术之一。石墨相氮化碳(g-C_(3)N_(4))以其合适的带隙宽度、丰富的活性位点和成本低廉等优点,近年已成为极具有应用前景的光催化材料。然而,单一g-C_(3)N_(4)的可见光响应范围窄、电子-空穴复合严重、光催化产氢效率低等问题制约了其在光催化领域的应用。对g-C_(3)N_(4)进行形貌调控、表面改性、元素掺杂、构建异质结是改善其光催化性能的有效策略。介绍了目前金属掺杂改性g-C_(3)N_(4)复合材料常见的制备方法,归纳了碱金属、过渡金属及稀土金属等非贵金属掺杂改性g-C_(3)N_(4)基复合材料的光催化水解制氢相关研究进展,旨在为光催化分解水制氢方面提供参考。 展开更多
关键词 石墨相碳化氮 金属掺杂 光催化产氢
下载PDF
金属有机框架衍生的Co_(3)O_(4)/SnO_(2)复合材料制备及其光催化性能 被引量:1
15
作者 吴函鸿 刘善鑫 +2 位作者 王大卫 黄茹婷 陈志文 《上海大学学报(自然科学版)》 CAS CSCD 北大核心 2024年第1期54-67,共14页
金属有机框架(metal-organic framework,MOF)材料ZIF-67衍生Co_(3)O_(4)十二面体纳米块在室温下与SnO_(2)复合,制备出立方体Co_(3)O_(4)/SnO_(2)复合光催化剂.煅烧后形成的Co_(3)O_(4)/SnO_(2)材料禁带宽度明显降低,荧光淬灭明显,说明Co... 金属有机框架(metal-organic framework,MOF)材料ZIF-67衍生Co_(3)O_(4)十二面体纳米块在室温下与SnO_(2)复合,制备出立方体Co_(3)O_(4)/SnO_(2)复合光催化剂.煅烧后形成的Co_(3)O_(4)/SnO_(2)材料禁带宽度明显降低,荧光淬灭明显,说明Co_(3)O_(4)的加入拓展了SnO_(2)的光响应范围至可见光甚至红外光区域,同时促进了光催化反应过程中光生载流子的分离.以罗丹明B(Rhodamine B,Rh B)为目标反应物,在可见光下考察了MOF衍生的Co_(3)O_(4)/SnO_(2)的光催化降解活性,发现Co_(3)O_(4)/SnO_(2)在60 min内可以降解89.6%的Rh B,分别是纯SnO_(2)和纯ZIF-67的4.5倍和3倍.同时,Co_(3)O_(4)/SnO_(2)表现出了良好的光反应能力和稳定性.基于以上实验结果并结合自由基淬灭实验,提出了MOF衍生的Co_(3)O_(4)/SnO_(2)复合材料光催化降解有机染料RhB的机理. 展开更多
关键词 Co_(3)O_(4)/SnO_(2) 金属有机框架 光催化 机理
下载PDF
Highly Efficient Aligned Ion‑Conducting Network and Interface Chemistries for Depolarized All‑Solid‑State Lithium Metal Batteries 被引量:2
16
作者 Yongbiao Mu Shixiang Yu +12 位作者 Yuzhu Chen Youqi Chu Buke Wu Qing Zhang Binbin Guo Lingfeng Zou Ruijie Zhang Fenghua Yu Meisheng Han Meng Lin Jinglei Yang Jiaming Bai Lin Zeng 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第5期102-119,共18页
Improving the long-term cycling stability and energy density of all-solid-state lithium(Li)-metal batteries(ASSLMBs)at room temperature is a severe challenge because of the notorious solid–solid interfacial contact l... Improving the long-term cycling stability and energy density of all-solid-state lithium(Li)-metal batteries(ASSLMBs)at room temperature is a severe challenge because of the notorious solid–solid interfacial contact loss and sluggish ion transport.Solid electrolytes are generally studied as two-dimensional(2D)structures with planar interfaces,showing limited interfacial contact and further resulting in unstable Li/electrolyte and cathode/electrolyte interfaces.Herein,three-dimensional(3D)architecturally designed composite solid electrolytes are developed with independently controlled structural factors using 3D printing processing and post-curing treatment.Multiple-type electrolyte films with vertical-aligned micro-pillar(p-3DSE)and spiral(s-3DSE)structures are rationally designed and developed,which can be employed for both Li metal anode and cathode in terms of accelerating the Li+transport within electrodes and reinforcing the interfacial adhesion.The printed p-3DSE delivers robust long-term cycle life of up to 2600 cycles and a high critical current density of 1.92 mA cm^(−2).The optimized electrolyte structure could lead to ASSLMBs with a superior full-cell areal capacity of 2.75 mAh cm^(−2)(LFP)and 3.92 mAh cm^(−2)(NCM811).This unique design provides enhancements for both anode and cathode electrodes,thereby alleviating interfacial degradation induced by dendrite growth and contact loss.The approach in this study opens a new design strategy for advanced composite solid polymer electrolytes in ASSLMBs operating under high rates/capacities and room temperature. 展开更多
关键词 All-solid-state lithium metal batteries Composite solid electrolyte 3D printing Areal capacity Interfacial degradation
下载PDF
Development of 3D bicontinuous metal-intermetallic composites through subsequent alloying process after liquid metal dealloying
17
作者 Jee Eun Jang Jihye Seong +1 位作者 Soo-Hyun Joo Sung Hyuk Park 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2023年第11期4274-4281,共8页
This study presents a novel process for the fabrication of metal-intermetallic composites with a 3D bicontinuous structure, achieved through a combination of liquid metal dealloying(LMD) and subsequent alloying. Initi... This study presents a novel process for the fabrication of metal-intermetallic composites with a 3D bicontinuous structure, achieved through a combination of liquid metal dealloying(LMD) and subsequent alloying. Initially, porous Ti structures are produced using the LMD process, followed by immersion in a molten Mg-3Al(wt%) metal. Due to the higher thermodynamic miscibility of Al with Ti compared to Mg, the concentration of Al in the Ti matrix increases as the immersion time increases. This results in a sequential phase transition within the Ti matrix: α-Ti → Ti_(3)Al → Ti Al. The phase transition considerably affects the hardness and strength of the composite material,with the Mg-Ti_(3)Al-Ti Al composite exhibiting a maximum hardness nearly twice as high as that of the conventional Mg-Ti composite. This innovative process holds potential for the development of various bicontinuous metal-intermetallic composites. 展开更多
关键词 Liquid metal dealloying Subsequent alloying metal–intermetallic composite 3D bicontinuous structure HARDNESS
下载PDF
3D Free-Standing Carbon Nanofibers Modified by Lithiophilic Metals Enabling Dendrite-Free Anodes for Li Metal Batteries
18
作者 Huifeng Zhuang Tengfei Zhang +4 位作者 Hong Xiao Xiao Liang Fanchao Zhang Jianlin Deng Qiuming Gao 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2023年第3期373-384,共12页
Li metal with high-energy density is considered as the most promising anode for the next-generation rechargeable Li metal batteries;however,the growth of Li dendrites seriously hinders its practical application.Herein... Li metal with high-energy density is considered as the most promising anode for the next-generation rechargeable Li metal batteries;however,the growth of Li dendrites seriously hinders its practical application.Herein,3D free-standing carbon nanofibers modified by lithiophilic metal particles(CNF/Me,Me=Sn,Fe,Co)are obtained in situ by the electrospinning method.Benefiting from the lithophilicity,the CNF/Me composite may effectively prevent the formation of Li dendrites in the Li metal batteries.The optimized CNF/Sn–Li composite electrode exhibits a stable cycle life of over 2350 h during Li plating/stripping.When matched with typical commercial LiFePO_(4)(LFP)cathode,the LFP//CNF/Sn–Li full cell presents a high initial discharge specific capacity of 139 mAh g^(−1)at 1 C,which remains at 146 mAh g^(−1)after 400 cycles.When another state-of-the-art commercial LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM(811))cathode is used,the assembled NCM//CNF/Sn–Li full cell shows a large initial specific discharge capacity of 206 mAh g^(−1)at substantially enhanced 10 C,which keeps at the good capacity of 99 mAh g^(−1)after 300 cycles.These results are greatly superior to the counterparts with Li as the anodes,indicating the great potential for practical utilization of the advanced CNF/Sn–Li electrode. 展开更多
关键词 3D free-standing carbon nanofibers dendrite-free anodes electrospinning method lithiophilic metal lithium metal batteries
下载PDF
Nonlinear fluid flow through three-dimensional rough fracture networks:Insights from 3D-printing,CT-scanning,and high-resolution numerical simulations 被引量:1
19
作者 Bo Li Jiafei Wang +1 位作者 Richeng Liu Yujing Jiang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2021年第5期1020-1032,共13页
Nonlinear flow behavior of fluids through three-dimensional(3D)discrete fracture networks(DFNs)considering effects of fracture number,surface roughness and fracture aperture was experimentally and numerically investig... Nonlinear flow behavior of fluids through three-dimensional(3D)discrete fracture networks(DFNs)considering effects of fracture number,surface roughness and fracture aperture was experimentally and numerically investigated.Three physical models of DFNs were 3D-printed and then computed tomography(CT)-scanned to obtain the specific geometry of fractures.The validity of numerically simulating the fluid flow through DFNs was verified via comparison with flow tests on the 3D-printed models.A parametric study was then implemented to establish quantitative relations between the coefficients/parameters in Forchheimer’s law and geometrical parameters.The results showed that the 3D-printing technique can well reproduce the geometry of single fractures with less precision when preparing complex fracture networks,numerical modeling precision of which can be improved via CT-scanning as evidenced by the well fitted results between fluid flow tests and numerical simulations using CT-scanned digital models.Streamlines in DFNs become increasingly tortuous as the fracture number and roughness increase,resulting in stronger inertial effects and greater curvatures of hydraulic pressure-low rate relations,which can be well characterized by the Forchheimer’s law.The critical hydraulic gradient for the onset of nonlinear flow decreases with the increasing aperture,fracture number and roughness,following a power function.The increases in fracture aperture and number provide more paths for fluid flow,increasing both the viscous and inertial permeabilities.The value of the inertial permeability is approximately four orders of magnitude greater than the viscous permeability,following a power function with an exponent a of 3,and a proportional coefficient b mathematically correlated with the geometrical parameters. 展开更多
关键词 Nonlinear flow 3d-printing CT-scanning Fracture network Permeability Fluid flow test
下载PDF
Nb对MnTiO_(x)在烧结烟气的NH_(3)-SCR低温催化活性及抗钾毒化的促进作用
20
作者 喻瑞 朱繁 +2 位作者 史光 崔俊明 张维萍 《分子催化(中英文)》 CAS CSCD 北大核心 2024年第5期427-436,I0002,共11页
钢铁行业的烧结烟气中存在大量的氮氧化物(NO_(x)),严重破坏环境,并威胁人类健康.目前NO_(x)脱除(DeNO_(x))最有效的方法是氨气选择性催化还原法(NH_(3)-SCR).在众多NH_(3)-SCR催化剂中,MnTiO_(x)催化剂表现出较好的低温活性,具有较好... 钢铁行业的烧结烟气中存在大量的氮氧化物(NO_(x)),严重破坏环境,并威胁人类健康.目前NO_(x)脱除(DeNO_(x))最有效的方法是氨气选择性催化还原法(NH_(3)-SCR).在众多NH_(3)-SCR催化剂中,MnTiO_(x)催化剂表现出较好的低温活性,具有较好的烧结烟气脱硝应用前景.但实际应用中,MnTiO_(x)容易受到以K为代表的碱金属物种的毒化.因此,采用Nb针对性地对MnTiO_(x)进行改性,以提高催化剂的抗碱金属中毒性能.我们考察了引入不同Nb含量对MnTiO_(x)NH_(3)-SCR反应性能和抗碱金属性能的影响.Nb改性后的MnTiO_(x)催化剂相较于原催化剂,其反应性能和抗碱金属K中毒的性能均具有显著提高.结果表明,当Nb含量较低时,K会在催化剂上形成较为明显的钾锰氧化物物种,减少催化剂上酸性位点的数量和强度,并降低Mn4+和活性氧物种的比例,这是催化剂K中毒后反应活性降低的原因.引入Nb后,增加了催化剂的酸性位点、Mn4+和活性氧物种的比例,并且K中毒之后,这些物种下降的幅度明显减少,因此引入Nb后使得催化剂的反应活性和抗碱金属中毒性能大幅提升. 展开更多
关键词 NH_(3)-SCR 低温活性 抗钾中毒 MnTiO_(x)氧化物 Nb改性
下载PDF
上一页 1 2 49 下一页 到第
使用帮助 返回顶部