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Nitrogen Doped Multi-channel Graphite for High Rate and High Capacity Li Ion Battery 被引量:1
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作者 张红娜 WU Xiaoqiang 李荣辉 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2020年第1期65-70,共6页
Nitrogen doped multi-channel graphite was successfully prepared by using nitrogen doping and KOH etching technologies.The three-electrode and EIS tests indicates that the etched graphite possesses lower electrochemica... Nitrogen doped multi-channel graphite was successfully prepared by using nitrogen doping and KOH etching technologies.The three-electrode and EIS tests indicates that the etched graphite possesses lower electrochemical resistance than the pristine graphite.The coin cell tests demonstrate that N doped multichannel graphite possesses a specific capacity of 361 mAh/g and coulombic efficiencies of 91.4%.No dramatic irreversible capacity loss results from the increased specific surface area(from 1.60 to 2.08 m^2/g),removing the need for a trade-off between irreversible capacity loss and surface area.Full polymer cells were fabricated and electrochemical capabilities were measured.In 3C fast charge protocol,the charging capacity can reach 51%within 10 min charge,and 100%within 30 min,demonstrating excellent fast charging characteristic.The fast charge cycle performance with 3C-rate charge and 1C-rate discharge from 4.35-3.0 V was conducted at RT temperature.The capacity retention is 94%after 600 cycles,which shows good cycle performance. 展开更多
关键词 NITROGEN DOPING KOH etched fast CHARGE graphite
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Evaluation of The Thermal Performance of Multi-Element Doped Graphite under Steady-State High Heat Flux
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作者 陈俊凌 李建刚 +3 位作者 野田信明 久保田雄辅 郭全贵 裘亮 《Plasma Science and Technology》 SCIE EI CAS CSCD 2002年第4期1387-1394,共8页
Multi-element doped graphite, GBST1308 has been developed as a plasma facing material (PFM) for high heat flux components of the HT-7U device. The thermal performance of the material under steady-state (SS) high heat ... Multi-element doped graphite, GBST1308 has been developed as a plasma facing material (PFM) for high heat flux components of the HT-7U device. The thermal performance of the material under steady-state (SS) high heat flux was evaluated under actively cooling conditions, the specimens were mechanically joined to copper heat sink with supercarbon sheet as a compliant layer between the interfaces. The experiments have been performed in a facility of ACT (actively cooling test stand) with a 100 kW electron gun in order to test the suitability and the loading limit of such materials. The surface temperature and bulk temperature distribution of the specimens were investigated. The experimental results are very encouraging that when heat flux is not more than 6 MW/m2, the surface temperature of GBST1308 is less than 1000℃, which is the lowest, compared with IG-430U and even with CX-2002U (CFC); The primary results indicate that the mechanically-joined material system by such a proper design as thin tile, super compliant layer, GBST as a PFM and copper-alloy heat sink, can be used as divertor plates for HT-7U in the first phase. 展开更多
关键词 doped graphite heat sink compliant layer steady state high heat flux surface temperature bulk temperature distribution
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Iron-based catalysts encapsulated by nitrogen-doped graphitic carbon for selective synthesis of liquid fuels through the Fischer-Tropsch process 被引量:3
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作者 Lei Tang Xiao‐Ling Dong +2 位作者 Wei Xu Lei He An‐Hui Lu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第12期1971-1979,共9页
Fischer‐Tropsch synthesis(FTS)has the potential to be a powerful strategy for producing liquid fuels from syngas if highly selective catalysts can be developed.Herein,a series of iron nanoparticle catalysts encapsula... Fischer‐Tropsch synthesis(FTS)has the potential to be a powerful strategy for producing liquid fuels from syngas if highly selective catalysts can be developed.Herein,a series of iron nanoparticle catalysts encapsulated by nitrogen‐doped graphitic carbon were prepared by a one‐step pyrolysis of a ferric L‐glutamic acid complex.The FeC‐800 catalyst pyrolyzed at 800°C showed excellent catalytic activity(239.4μmolCO gFe–1 s–1),high C5–C11 selectivity(49%),and good stability in FTS.The high dispersion of ferric species combined with a well‐encapsulated structure can effectively inhibit the migration of iron nanoparticles during the reaction process,which is beneficial for high activity and good stability.The nitrogen‐doped graphitic carbon shell can act as an electron donor to the iron particles,thus promoting CO activation and expediting the formation of Fe5C2,which is the key factor for obtaining high C5–C11 selectivity. 展开更多
关键词 Nitrogen doping graphitic carbon ENCAPSULATION Iron‐based catalyst Fischer‐Tropsch synthesis
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Nitrogen-doped Carbon Nanospheres-Modified Graphitic Carbon Nitride with Outstanding Photocatalytic Activity 被引量:5
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作者 Qiaoran Liu Hao Tian +6 位作者 Zhenghua Dai Hongqi Sun Jian Liu Zhimin Ao Shaobin Wang Chen Han Shaomin Liu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2020年第2期154-168,共15页
Metals and metal oxides are widely used as photo/electro-catalysts for environmental remediation.However,there are many issues related to these metal-based catalysts for practical applications,such as high cost and de... Metals and metal oxides are widely used as photo/electro-catalysts for environmental remediation.However,there are many issues related to these metal-based catalysts for practical applications,such as high cost and detrimental environmental impact due to metal leaching.Carbon-based catalysts have the potential to overcome these limitations.In this study,monodisperse nitrogen-doped carbon nanospheres(NCs)were synthesized and loaded onto graphitic carbon nitride(g-C3N4,GCN)via a facile hydrothermal method for photocatalytic removal of sulfachloropyridazine(SCP).The prepared metal-free GCN-NC exhibited remarkably enhanced efficiency in SCP degradation.The nitrogen content in NC critically influences the physicochemical properties and performances of the resultant hybrids.The optimum nitrogen doping concentration was identified at 6.0 wt%.The SCP removal rates can be improved by a factor of 4.7 and 3.2,under UV and visible lights,by the GCN-NC composite due to the enhanced charge mobility and visible light harvesting.The mechanism of the improved photocatalytic performance and band structure alternation were further investigated by density functional theory(DFT)calculations.The DFT results confirm the high capability of the GCN-NC hybrids to activate the electron–hole pairs by reducing the band gap energy and efficiently separating electron/hole pairs.Superoxide and hydroxyl radicals are subsequently produced,leading to the efficient SCP removal. 展开更多
关键词 N-DOPING Carbon sphere graphitic carbon nitride PHOTOCATALYSIS DEGRADATION
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Effect of lithium or aluminum substitution on the characteristics of graphite for anode of lithium ion batteries 被引量:9
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作者 GUO Huajun, LI Xinhai, WANG Zhixing, PENG Wenjie, and GUO YongxingCollege of Metallurgical Science and Engineering, Central South University, Changsha 410083, China 《Rare Metals》 SCIE EI CAS CSCD 2003年第4期280-284,共5页
Modification of graphite for anode of lithium ion batteries is investigated.Results of X-ray diffraction shows lithium and aluminum exists as Li compound (CH_3COOLi.2 H_2O) andAl compound (AlD_3) in the graphite, resp... Modification of graphite for anode of lithium ion batteries is investigated.Results of X-ray diffraction shows lithium and aluminum exists as Li compound (CH_3COOLi.2 H_2O) andAl compound (AlD_3) in the graphite, respectiovely. The Brunauer-Emmer-Teller (BET) surface area ofthe modified graphite increases. According to the electrochemical measurements of Li/C cell andprototype Li-ion batteries, the Li-doped graphite has large reversible capacity of 312.2 mA.h/g, lowirreversible capacity of 52.9 mA.h/g, and high initial coulombic efficiency of 85.51 percent. The063448 size prototype battery with Li-doped graphite anode has large discharge capacity of 845 mA.hand good cycling performance. The initial charge/discharge characteristic of Al-doped graphite isclose to those of undoped graphite, but the prototype battery with Al-doped anode shows the bestcycling performance with capacity retention ratio of 94.06 percent at the 200 th cycle. 展开更多
关键词 Battery graphite dope LITHIUM ALUMINUM
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P-doped electrode for vanadium flow battery with high-rate capability and all-climate adaptability 被引量:1
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作者 Lihong Yu Feng Lin +1 位作者 Lin Xu Jingyu Xi 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2019年第8期55-59,I0003,共6页
A phosphorous-doped graphite felt(PGF) is fabricated and examined as electrode for vanadium flow battery(VFB). P doping improves the electrolyte wettability of GF and induces more defect sites on its surface, resultin... A phosphorous-doped graphite felt(PGF) is fabricated and examined as electrode for vanadium flow battery(VFB). P doping improves the electrolyte wettability of GF and induces more defect sites on its surface, resulting in significantly enhanced activity and reversibility towards VO2^+/VO2^+ and V^2+/V3^+couples. VFB with PGF electrode demonstrates outstanding performance such as high-rate capability under 50–400 mA cm^-2, wide-temperature tolerance at-20 °C–60 °C, and excellent durability over 1000 charge–discharge cycles. These merits enable PGF a promising electrode for the next-generation VFB,which can operate at high-power and all-climate conditions. 展开更多
关键词 VANADIUM flow battery graphite FELT P doping HIGH-POWER ELECTRODE All-climate
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Bio-derived N-doped porous carbon as sulfur hosts for high performance lithium sulfur batteries 被引量:3
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作者 LIU Yan-yan YAN Li-jing +9 位作者 ZENG Xian-qing LI Ze-heng ZHOU Shu-dong DU Qiao-kun MENG Xiang-juan ZENG Xiao-min LING Min SUN Ming-hao QIAN Chao LIANG Cheng-du 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第6期1426-1434,共9页
Shuttle effect,poor conductivity and large volume expansion are the main factors that hinder the practical application of sulfur cathodes.Currently,rational structure designing of carbon-based sulfur hosts is the most... Shuttle effect,poor conductivity and large volume expansion are the main factors that hinder the practical application of sulfur cathodes.Currently,rational structure designing of carbon-based sulfur hosts is the most effective strategy to address the above issues.However,the preparation process of carbon-based sulfur hosts is usually complex and costly.Therefore,it is necessary to develop an efficient and cost-effective method to fabricate carbon hosts for high-performance sulfur cathodes.Herein,we reported the fabrication of a bio-derived nitrogen doped porous carbon materials(BNPC)via a molten-salt method for high performance sulfur cathodes.The long-range-ordered honeycomb structure of BNPC is favorable for the trapping of polysulfide(PS)species and accommodates the volumetric variation of sulfur during cycling,while the high graphitization degree of BNPC favors the redox kinetics of sulfur cathodes.Moreover,the nitrogen doping content not only enhances the electrical conductivity of BNPC,but also provides ample anchoring sites for the immobilization of PS,which plays a key role in suppressing the shuttle effect.As a result,the S@BNPC cathode exhibits a high initial specific capacity of 1189.4 mA·h/g at 0.2C.After 300 cycles,S@BNPC still maintains a capacity of 703.2 mA·h/g which corresponds to a fading rate of 0.13%per cycle after the second cycle.This work offers vast opportunities for the large-scale application of high performance carbon-based sulfur hosts. 展开更多
关键词 lithium sulfur batteries high graphitization nitrogen doping sulfur hosts shuttle effect
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Synergetic effect of nitrogen‐doped carbon catalysts for high‐efficiency electrochemical CO_(2) reduction 被引量:1
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作者 Chuhao Liu Yue Wu +8 位作者 Jinjie Fang Ke Yu Hui Li Wenjun He Weng‐Chon Cheong Shoujie Liu Zheng Chen Jing Dong Chen Chen 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2022年第7期1697-1702,共6页
The use of carbon‐based materials is an appealing strategy to solve the issue of excessive CO_(2) emis‐sions.In particular,metal‐free nitrogen‐doped carbon materials(mf‐NCs)have the advantages of convenient synth... The use of carbon‐based materials is an appealing strategy to solve the issue of excessive CO_(2) emis‐sions.In particular,metal‐free nitrogen‐doped carbon materials(mf‐NCs)have the advantages of convenient synthesis,cost‐effectiveness,and high conductivity and are ideal electrocatalysts for the CO_(2) reduction reaction(CO_(2)RR).However,the unclear identification of the active N sites and the low intrinsic activity of mf‐NCs hinder the further development of high‐performance CO_(2)RR electrocat‐alysts.Achieving precise control over the synthesis of mf‐NC catalysts with well‐defined active N‐species sites is still challenging.To this end,we adopted a facile synthesis method to construct a set of mf‐NCs as robust catalysts for CO_(2)RR.The resulting best‐performing catalyst obtained a Far‐adaic efficiency of CO of approximately 90%at−0.55 V(vs.reversible hydrogen electrode)and good stability.The electrocatalytic performance and in situ attenuated total reflectance surface‐enhanced infrared absorption spectroscopy measurements collectively revealed that graphitic and pyridinic N can synergistically adsorb CO_(2) and H_(2)O and thus promote CO_(2) activation and protonation. 展开更多
关键词 CO_(2)reduction reaction Nitrogen‐doped carbon material Pyridinic N graphitic N Synergetic effect
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Doping inhomogeneity and staging of ultra-thin graphite intercalation compound flakes probed by visible and near-infrared Raman spectroscopy
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作者 鲁妍 张昕 +3 位作者 吴江滨 李晓莉 厉巧巧 谭平恒 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第7期524-528,共5页
When ultra-thin graphite intercalation compounds(GICs) are deposited on the SiO2/Si substrate, it is found that their colors are dependent on the thickness of GIC flakes. The sample colors of ultrathin GIC flakes ca... When ultra-thin graphite intercalation compounds(GICs) are deposited on the SiO2/Si substrate, it is found that their colors are dependent on the thickness of GIC flakes. The sample colors of ultrathin GIC flakes can no longer provide qualitative information on the stage index. Here, multi-wavelength Raman spectroscopy is thus applied to study the doping inhomogeneity and staging of ultra-thin GICs by FeCl3 intercalation. The G band intensity of stage-1 GIC flakes is strongly enhanced by 532-nm laser excitation, while that of stage-2 and stage-3 flakes exhibits strong intensity enhancement for 785-nm laser excitation. The near-infrared lasers are suggested to probe the doping inhomogeneity and staging of ultra-thin GIC flakes. 展开更多
关键词 ultra-thin graphite intercalation compounds Raman spectroscopy intensity enhancement doping inhomogeneity
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Silicone Rubber Composites with Improved Electrical Conductivity/Hardness Using Hybrid Fillers: Carbon Black-Expanded GraphitelPolyaniline
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作者 Apama Joshi Anjali Athawale 《材料科学与工程(中英文B版)》 2013年第4期226-234,共9页
关键词 橡胶复合材料 混合填料 高硬度 电碳 电导率 黑色 导电复合材料
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Nitrogen doping and graphitization tuning coupled hard carbon for superior potassium-ion storage 被引量:8
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作者 Junxian Hu Yangyang Xie +1 位作者 Meng Yin Zhian Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第10期327-334,共8页
Hard carbon material is one of the most promising anode materials for potassium ion batteries(PIBs)due to its distinct disordered and non-expandable framework.However,the intrinsically disordered microarchitecture of ... Hard carbon material is one of the most promising anode materials for potassium ion batteries(PIBs)due to its distinct disordered and non-expandable framework.However,the intrinsically disordered microarchitecture of hard carbon results in low electric conductivity and poor rate capability.Herein,nitrogendoped and partially graphitized hard carbons(NGHCs)derived from commercial coordination compound precursor-ethylenediaminetetraacetic acid(EDTA)disodium cobalt salt hydrate are designed and prepared as high-performance PIBs anode materials.By means of a facile annealing method,nitrogen elements and graphitic domains can be controllably introduced to NGHCs.The resulting NGHCs show structural merits of mesoporous construction,nitrogen doping and homogeneous graphitic domains,which ensures fast kinetics and electron transportation.Applying in anode for PIBs,NGHCs exhibit robust rate capability with high reversible capacity of 298.8 m Ah g^-1 at 50 m A g^-1,and stable cycle stability of 137.6 mAh g^-1 at 500 m A g^-1 after 1000 cycles.Moreover,the ex situ Raman spectra reveal a mixture"adsorption-intercalation mechanism"for potassium storage of NGHCs.More importantly,full PIBs by pairing with perylenetetracarboxylic dianhydride(PTCDA)cathode demonstrate the promising potential of practical application.In terms of commercial precursor,facile synthesis and long cycle lifespan,NGHCs represent a brilliant prospect for practical large-scale applications. 展开更多
关键词 Hard carbon Nitrogen doping graphitic domains Potassium ion batteries Adsorption-intercalation mechanism
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S/N-co-doped graphite nanosheets exfoliated via three-roll milling for high-performance sodium/potassium ion batteries 被引量:3
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作者 Xin Wang Zhicong Luo +8 位作者 Juntong Huang Zhi Chen Tong Xiang Zhijun Feng Jing Wang Sinong Wang Yongcun Ma Huiyong Yang Xibao Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第16期47-55,共9页
Due to its larger ionic radius,further studies are needed before graphite can be used as an anode for sodium/potassium-ion batteries(SIBs/KIBs).It is believed that doping and increasing the layer spacing can improve t... Due to its larger ionic radius,further studies are needed before graphite can be used as an anode for sodium/potassium-ion batteries(SIBs/KIBs).It is believed that doping and increasing the layer spacing can improve the Na+/K+storage.Herein,S/N co-doped graphite nanosheets(GNS)with an enlarged interlayer spacing of 0.39 nm were prepared via exfoliation with three-roll milling(TRM)combined with thiourea heated at different temperatures.This method generates abundant defects and active sites for GNS,as well as facilitates rapid access and transport of electrolytes and electrons/ions.The electrochemical results show that the S/N-doped GNS exfoliated 15 times and heated at 600°C(SNGNS15-600)with thiourea as the electrode delivers a discharge capacity of 94 mAh g–1 over 6000 cycles at 10 A g–1 with an enhanced rate capability and stable performance for application in SIBs.Calculations using density functional theory show that the increased interlayer spacing by TRM and S,N co-doping enhances the adsorption energies of Na+on graphite,thus improving the Na+storage.As the anode for KIBs,the SNGNS15-600 electrode has a capacity of 142 mAh g–1 after 5000 cycles at 0.5 A g–1.This study provides an essential theoretical basis for the effective exfoliation of layered graphite-based materials and their applications in energy storage. 展开更多
关键词 graphite nanosheets S/N doping Three-roll milling Sodium-ion batteries Potassium-ion batteries
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Synthesis of few-layer N-doped graphene from expandable graphite with melamine and its application in supercapacitors 被引量:1
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作者 Yunpeng Wu Xiaoyang Liu +7 位作者 Dandan Xia Qiushi Sun Deyang Yu Shuanggan Sun Xilong Liu Yifei Teng Weige Zhang Xudong Zhao 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第2期559-564,共6页
In this paper,we introduced a novel method to prepare the few-layer nitrogen-doped graphene(FNG)from expandable graphite with melamine.The super-capacitive properties of FNG were thoroughly characterized by a three-el... In this paper,we introduced a novel method to prepare the few-layer nitrogen-doped graphene(FNG)from expandable graphite with melamine.The super-capacitive properties of FNG were thoroughly characterized by a three-electrode system,and the results showed the FNG electrode achieved a specific capacitance as high as 83.8 mF/cm2 together with excellent cycling stability.This method could be a novel approach to combine the pseudo-capacitors and electric double layer capacitors. 展开更多
关键词 EXPANDABLE graphite GRAPHENE Nitrogen doping Supercapacitor MELAMINE
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Polyaniline-derived carbon nanofibers with a high graphitization degree loading ordered PtNi intermetallic nanoparticles for oxygen reduction reaction
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作者 Yujuan Zhuang Jiao Yang +4 位作者 Lingwei Meng Chuanming Ma Lishan Peng De Chen Qingjun Chen 《Industrial Chemistry & Materials》 2023年第3期458-464,共7页
At present,the catalysts commercially used for the oxygen reduction reaction of the cathode of proton exchange membrane fuel cells(PEMFCs)are carbon-supported platinum-based catalysts.However,the carbon supports are s... At present,the catalysts commercially used for the oxygen reduction reaction of the cathode of proton exchange membrane fuel cells(PEMFCs)are carbon-supported platinum-based catalysts.However,the carbon supports are susceptible to corrosion under harsh working conditions,which greatly shortens the life of the catalysts.Highly stable carbon supports are urgently required for high-performance PEMFCs.In this work,we developed structure-stable and highly graphitized three-dimensional network carbon nanofibers(CNF)derived from polyaniline by heat treatment at 1200℃.The CNF-1200-based catalyst(PtNi/CNF-1200)loaded with PtNi nanoparticles showed excellent stability.After 5000 cycles from 1.0 to 1.5 V in oxygen saturated 0.1 M HClO_(4) electrolyte,the losses in the half-wave potential and mass activity were only 5 mV and 15%,respectively,far lower than those of commercial Pt/C.The high graphitization degree of CNF-1200 promotes the corrosion resistance of the catalyst.In addition,nitrogen doping effectively facilitates the catalyst–support interaction,stabilizes the highly dispersed PtNi nanoparticles,and improves the stability and activity of PtNi/CNF-1200. 展开更多
关键词 Support stability graphitization degree Nitrogen doping Oxygen reduction reaction
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铁磷共掺杂氮化碳光催化剂的制备及催化性能
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作者 周烈兴 李琛 +2 位作者 赵宇 张凯朋 柴希娟 《化工新型材料》 CAS CSCD 北大核心 2024年第9期209-214,共6页
以双氰胺单体、硝酸铁和磷酸氢二铵为前驱体,制备了铁磷共掺杂氮化碳(P/Fe-CN)。采用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、X光电子能谱(XPS)和BET比表面积分析等方法研究了P/Fe-CN的晶相、结构和元素组成。结果表明:Fe和P共... 以双氰胺单体、硝酸铁和磷酸氢二铵为前驱体,制备了铁磷共掺杂氮化碳(P/Fe-CN)。采用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、X光电子能谱(XPS)和BET比表面积分析等方法研究了P/Fe-CN的晶相、结构和元素组成。结果表明:Fe和P共掺杂的协同作用打开了原始氮化碳紧密的片层堆积结构和团聚状态,有效降低了原始g-C_(3)N_(4)的禁带宽度,增加了活性物质,提高了光催化性能。其中,P掺杂量为5%的双掺杂样品(5%P/Fe-CN)在可见光下对甲基橙(MO)表现出最优的光催化活性。其光催化降解MO的速率常数为0.03863min-1,是g-C 3N 4光催化效率的4.7倍。紫外-可见光(UV-Vis)结果表明,5%P/Fe-CN的带隙宽度为2.248eV,较原始g-C 3N 4减小了0.331eV。 展开更多
关键词 g-C_(3)N_(4) 可见光催化 共掺杂 协同作用
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石墨相氮化碳的非金属多元素掺杂改性研究进展
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作者 朱蓓蓓 余健美 +1 位作者 周杰 刁国旺 《化工新型材料》 CAS CSCD 北大核心 2024年第10期49-55,共7页
石墨相氮化碳(g-C_(3)N_(4))因廉价易得、环境友好且催化活性好等优点,逐渐在催化和环境等领域成为研究热点。然而,单一g-C_(3)N_(4)存在对可见光的吸收效率低等缺点,采用元素掺杂实现g-C_(3)N_(4)的骨架结构的调整,是克服这一缺点的有... 石墨相氮化碳(g-C_(3)N_(4))因廉价易得、环境友好且催化活性好等优点,逐渐在催化和环境等领域成为研究热点。然而,单一g-C_(3)N_(4)存在对可见光的吸收效率低等缺点,采用元素掺杂实现g-C_(3)N_(4)的骨架结构的调整,是克服这一缺点的有效方法。对近年来有关非金属多元素组合掺杂的研究工作进行了系统总结,主要包括含氧、磷、硼和卤素等元素的二元和多元组合,并对非金属元素掺杂工作中存在的问题及未来发展方向进行了展望。 展开更多
关键词 石墨相氮化碳 元素掺杂 非金属 多元素
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Mo-g-C_(3)N_(4)制备与可见光催化性能
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作者 艾兵 蒋泓城 +1 位作者 何海南 李德刚 《山东理工大学学报(自然科学版)》 CAS 2024年第4期66-70,78,共6页
以三聚氰胺和四水合钼酸铵为前驱体,利用一锅法制备了不同钼掺杂浓度的石墨型氮化碳光催化剂。利用X射线衍射(XRD)、红外光谱(FT-IR)、荧光光谱(PL)、扫描电子显微镜(SEM)等测试技术对合成催化剂进行了表征,结果发现:钼掺杂的氮化碳光... 以三聚氰胺和四水合钼酸铵为前驱体,利用一锅法制备了不同钼掺杂浓度的石墨型氮化碳光催化剂。利用X射线衍射(XRD)、红外光谱(FT-IR)、荧光光谱(PL)、扫描电子显微镜(SEM)等测试技术对合成催化剂进行了表征,结果发现:钼掺杂的氮化碳光催化剂具有石墨型结构,Mo的引入扩展了氮化碳的光谱响应范围,降低了光生电子和空穴的复合速率。亚甲基蓝的可见光降解测试表明,钼掺杂的氮化碳光催化剂比纯氮化碳展现出更高的光催化活性,掺杂浓度0.7%光催化剂的反应速率常数为纯氮化碳的1.4倍;同时,研究了Mo掺杂g-C_(3)N_(4)光催化降解性能的影响因素。 展开更多
关键词 石墨型氮化碳 钼掺杂 光催化剂 降解
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磷掺杂氮缺陷g-C_(3)N_(4)的合成及其光催化性能研究 被引量:2
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作者 邵宗涵 肖柯 +2 位作者 赵宇 张凯朋 柴希娟 《化工新型材料》 CAS CSCD 北大核心 2024年第3期214-219,共6页
以二氰胺和硫脲为混合前驱体,(NH4)2HPO4为磷源,采用热聚合联合快速高温法合成了磷掺杂氮缺陷石墨相氮化碳(g-C_(3)N_(4)),考察了前驱体配比、磷掺杂量和高温处理温度对g-C_(3)N_(4)结构和光催化活性的影响。结果表明,硫脲与二氰胺质量... 以二氰胺和硫脲为混合前驱体,(NH4)2HPO4为磷源,采用热聚合联合快速高温法合成了磷掺杂氮缺陷石墨相氮化碳(g-C_(3)N_(4)),考察了前驱体配比、磷掺杂量和高温处理温度对g-C_(3)N_(4)结构和光催化活性的影响。结果表明,硫脲与二氰胺质量比为6∶4,磷掺杂量为5%,高温处理温度为700℃时,得到样品(DS60-5%-700)光催化性能最优。其在60min时对亚甲基蓝的降解效率为96.15%,分别较DS60-5%和DS60%提升了1.24倍和1.5倍。P掺杂和快速高温处理降低了g-C_(3)N_(4)的带隙值,扩宽了可见光的吸收范围,同时在g-C_(3)N_(4)结构中进入了氮缺陷,促使光生载流子的有效分离。 展开更多
关键词 石墨相氮化碳 混合前驱体 氮缺陷 磷掺杂
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壳聚糖衍生碳包覆纳米硅复合材料锂离子电池性能研究 被引量:1
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作者 吴强 李正伟 +4 位作者 周建华 张冬梅 党锋 刘文平 苗蕾 《材料导报》 EI CAS CSCD 北大核心 2024年第10期8-13,共6页
硅负极材料因具有较高的理论容量(Li22Si5合金相对应4200 mAh/g)、较低的工作电压(0.2~0.3 V vs Li/Li+)和地球上丰富的原材料储备,成为代替石墨负极的理想材料之一。但是,低电导率及在循环过程中发生剧烈体积膨胀导致电极失效问题限制... 硅负极材料因具有较高的理论容量(Li22Si5合金相对应4200 mAh/g)、较低的工作电压(0.2~0.3 V vs Li/Li+)和地球上丰富的原材料储备,成为代替石墨负极的理想材料之一。但是,低电导率及在循环过程中发生剧烈体积膨胀导致电极失效问题限制了硅负极材料的进一步发展。因此,本工作通过物理法利用壳聚糖和石墨对纳米硅实现碳包覆和复合,制备壳聚糖/石墨@纳米硅复合材料(C/G@Si复合材料),对C/G@Si复合材料的结构、形貌和电化学性能进行研究。结果表明:随着石墨添加量的提高,C/G@Si复合材料的可逆比容量略微下降,循环性能和导电性能显著提高。当添加50%(质量分数)石墨时,在100 mA/g的电流密度下,C/G@Si复合材料的首次放电比容量为1136.1 mAh/g,循环充放电100次后剩余容量保持在658.5 mAh/g,展示出优异的电化学性能,对进一步推广硅碳负极材料具有一定的参考价值。 展开更多
关键词 锂离子电池 硅碳负极材料 壳聚糖 石墨掺杂
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水泥基硼掺杂石墨相氮化碳降解NO
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作者 付涛 李立 +3 位作者 高莉宁 朱富维 曹炜烨 陈华鑫 《化工进展》 EI CAS CSCD 北大核心 2024年第8期4403-4410,共8页
通过对石墨相氮化碳(g-C_(3)N_(4))和氧化硼(B_(2)O_(3))进行高温煅烧制备硼元素掺杂改性石墨相氮化碳(BCN),对其微观结构、形貌和光学特性进行表征。再以多孔水泥混凝土为光催化剂载体,研究掺杂g-C_(3)N_(4)和BCN的水泥基材料的力学性... 通过对石墨相氮化碳(g-C_(3)N_(4))和氧化硼(B_(2)O_(3))进行高温煅烧制备硼元素掺杂改性石墨相氮化碳(BCN),对其微观结构、形貌和光学特性进行表征。再以多孔水泥混凝土为光催化剂载体,研究掺杂g-C_(3)N_(4)和BCN的水泥基材料的力学性能和光催化降解NO性能。结果表明,B元素的引入会增大g-C_(3)N_(4)比表面积,改善水泥基材料对可见光的吸收,对NO的降解率达到40.7%。当掺杂BCN的质量分数达到水泥的6%时,水泥混凝土的7d抗压强度和28d抗压强度均达到最佳,分别为8.25MPa和14.4MPa;在可见光照射条件下,7d和28d光催化降解性能均达到最佳,分别为47%和63%。 展开更多
关键词 光催化 石墨相氮化碳 掺杂改性 降解NO 水泥混凝土
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