期刊文献+
共找到10篇文章
< 1 >
每页显示 20 50 100
Modified electronic structure and enhanced hydroxyl adsorption make quaternary Pt-based nanosheets efficient anode electrocatalysts for formic acid-/alcohol-air fuel cells
1
作者 Fengling Zhao Qiang Yuan +2 位作者 Siyang Nie Liang Wu Xun Wang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第5期142-150,共9页
Surface/interface engineering of a multimetallic nanostructure with diverse electrocatalytic properties for direct liquid fuel cells is desirable yet challenging.Herein,using visible light,a class of quaternary Pt_(1)... Surface/interface engineering of a multimetallic nanostructure with diverse electrocatalytic properties for direct liquid fuel cells is desirable yet challenging.Herein,using visible light,a class of quaternary Pt_(1)Ag_(0.1)Bi_(0.16)Te_(0.29)ultrathin nanosheets is fabricated and used as high-performance anode electrocatalysts for formic acid-/alcohol-air fuel cells.The modified electronic structure of Pt,enhanced hydroxyl adsorption,and abundant exterior defects afford Pt_(1)Ag_(0.1)Bi_(0.16)Te_(0.29)/C high intrinsic anodic electrocatalytic activity to boost the power densities of direct formic acid-/methanol-/ethanol-/ethylene glycol-/glycerol-air fuel cells,and the corresponding peak power density of Pt_(1)Ag_(0.1)Bi_(0.16)Te_(0.29)/C is respectively 129.7,142.3,105.4,124.3,and 128.0 mW cm^(-2),considerably outperforming Pt/C.Operando in situ Fourier transform infrared reflection spectroscopy reveals that formic acid oxidation on Pt_(1)Ag_(0.1)Bi_(0.16)Te_(0.29)/C occurs via a CO_(2)-free direct pathway.Density functional theory calculations show that the presence of Ag,Bi,and Te in Pt_(1)Ag_(0.1)Bi_(0.16)Te_(0.29)suppresses CO^(*)formation while optimizing dehydrogenation steps and synergistic effect and modified Pt effectively enhance H_(2)O dissociation to improve electrocatalytic performance.This synthesis strategy can be extended to 43 other types of ultrathin multimetallic nanosheets(from ternary to octonary nanosheets),and efficiently capture precious metals(i.e.,Pd,Pt,Rh,Ru,Au,and Ag)from different water sources. 展开更多
关键词 Pt-based nanosheets Modifiedelectronic structure Enhanced hydroxyl adsorption Formicacidand alcohol oxidation Direct liquid fuel cells
下载PDF
States of graphene oxide and surface functional groups amid adsorption of dyes and heavy metal ions
2
作者 Zhaoyang Han Ling Sun +6 位作者 Yingying Chu Jing Wang Chenyu Wei Qianlei Jiang Changbao Han Hui Yan Xuemei Song 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第11期197-208,共12页
Water pollution regarding dyes and heavy metal ions is crucial facing the world.How to effectively separate these contaminants from water has been a key issue.Graphene oxide(GO)promises the greenwater world as a long-... Water pollution regarding dyes and heavy metal ions is crucial facing the world.How to effectively separate these contaminants from water has been a key issue.Graphene oxide(GO)promises the greenwater world as a long-lasting spotlight adsorbent material and therefore,harnessing GO has been the research hotspot for over a decade.The state of GO as well as its surface functional groups plays an important role in adsorption.And the way of preparation and structural modification matters to the performance of GO.In this review,the significance of the state of existence of stock GO and surface functional groups is explored in terms of preparation,structural modification,and adsorption.Besides,various adsorbates for GO adsorption are also involved,the discussion of which is rarely established elsewhere. 展开更多
关键词 Stock graphene oxide Surface functional groups Existence state ADSORBATES Enhanced adsorption DYES
下载PDF
Adsorption behavior of carbon dioxide and methane in bituminous coal:A molecular simulation study 被引量:10
3
作者 Jing You Li Tian +4 位作者 Chao Zhang Hongxing Yao Wu Dou Bin Fan Songqing Hu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2016年第9期1275-1282,共8页
The adsorption behavior of CO_2, CH_4 and their mixtures in bituminous coal was investigated in this study. First, a bituminous coal model was built through molecular dynamic(MD) simulations, and it was confirmed to b... The adsorption behavior of CO_2, CH_4 and their mixtures in bituminous coal was investigated in this study. First, a bituminous coal model was built through molecular dynamic(MD) simulations, and it was confirmed to be reasonable by comparing the simulated results with the experimental data. Grand Canonical Monte Carlo(GCMC)simulations were then carried out to investigate the single and binary component adsorption of CO_2 and CH_4with the built bituminous coal model. For the single component adsorption, the isosteric heat of CO_2 adsorption is greater than that of CH_4 adsorption. CO_2 also exhibits stronger electrostatic interactions with the heteroatom groups in the bituminous coal model compared with CH_4, which can account for the larger adsorption capacity of CO_2 in the bituminous coal model. In the case of binary adsorption of CO_2 and CH_4mixtures, CO_2 exhibits the preferential adsorption compared with CH_4 under the studied conditions. The adsorption selectivity of CO_2 exhibited obvious change with increasing pressure. At lower pressure, the adsorption selectivity of CO_2 shows a rapid decrease with increasing the temperature, whereas it becomes insensitive to temperature at higher pressure. Additionally, the adsorption selectivity of CO_2 decreases gradually with the increase of the bulk CO_2 mole fraction and the depth of CO_2 injection site. 展开更多
关键词 Bituminous coal model adsorption selectivity Enhanced coal bed methane recovery Carbon dioxide sequestration Molecular simulation
下载PDF
Adsorptive Stripping Voltammetric Study of the Enhancement of Copper(Ⅱ) by Poly(vinyl alcohol), Starch and Polyallylamine 被引量:1
4
作者 Ming SONG Hui Min MA Yue Xian HUANG and Shu Quan LIANG (Institute of Chemistry. Academia Sinica, Beijing 100080) 《Chinese Chemical Letters》 SCIE CAS CSCD 1997年第6期529-532,共4页
Adsorptive enhancements of several water-soluble polymers on copper(Ⅱ) were studied by adsorptive stripping voltammetry with a hanging mercury drop electrode. Increases in peak current of cu(Ⅱ) were observed in al... Adsorptive enhancements of several water-soluble polymers on copper(Ⅱ) were studied by adsorptive stripping voltammetry with a hanging mercury drop electrode. Increases in peak current of cu(Ⅱ) were observed in alkaline carbonate media. The enhancing power of poly(vinyl alcohol), starch and polyallylamine is 15, 4. 1, and 2.5 times, repectively 展开更多
关键词 II by Poly Starch and Polyallylamine vinyl alcohol Adsorptive Stripping Voltammetric Study of the enhancement of Copper POLY
下载PDF
Adsorptive Stripping Voltammetric Study of the Enhancement of Copper(Ⅱ) in Phosphate and Carbonate media and in the Presence of Silicate
5
作者 Ming SONG Hui Min MA +1 位作者 Yue Xian HUANG and Shu Quan LIANG(Institute of Chemistry Chinese Academy of Sciences Beijing 100080) 《Chinese Chemical Letters》 SCIE CAS CSCD 1997年第1期61-64,共4页
Adsorptive enhancements of several inorganic salts on copper(II) were studied by adsorptive stripping voltammetry with a hanging mercury drop electrode Increase in peak curren of cu(II) were observed in alkaline phosp... Adsorptive enhancements of several inorganic salts on copper(II) were studied by adsorptive stripping voltammetry with a hanging mercury drop electrode Increase in peak curren of cu(II) were observed in alkaline phosphate or media owing to adsorption Silicate can also enhance the peak current of Cu(II). The enhancing power phosphate,carbonate, and silicate is 33, 26, and 8.9 times, respectively. 展开更多
关键词 in Phosphate and Carbonate media and in the Presence of Silicate II Adsorptive Stripping Voltammetric Study of the enhancement of Copper
下载PDF
Defect-induced synthesis of nanoscale hierarchically porous metal-organic frameworks with tunable porosity for enhanced volatile organic compound adsorption
6
作者 Kuan Liang Weibiao Guo +8 位作者 Linmei Li Huidong Cai Haiqi Zhang Jingjing Li Feng Xu Jian Yan Daofei Lv Hongxia Xi Chongxiong Duan 《Nano Materials Science》 EI CAS 2024年第4期467-474,共8页
Nanoscale hierarchically porous metal-organic frameworks(NH-MOFs)synergistically combine the advantages of nanoscale MOFs and hierarchically porous MOFs,resulting in remarkable characteristics such as increased specif... Nanoscale hierarchically porous metal-organic frameworks(NH-MOFs)synergistically combine the advantages of nanoscale MOFs and hierarchically porous MOFs,resulting in remarkable characteristics such as increased specific surface area,greater porosity,and enhanced exposure of active sites.Herein,nanoscale hierarchically porous UIO-66(UIO-66_X)was synthesized using a defect-induced strategy that employed ethylene diamine tetraacetic acid(EDTA)as a modulator.The introduced EDTA occupies the coordination sites of organic ligands,promoting the formation and growth of UIO-66 crystal nuclei and inducing defects during synthesis.The as-synthesized UIO-66_X crystals exhibit a uniform distribution with an average size of approximately 100 nm.In addition,the total pore volume attains a remarkable value of 0.95 cm^(3)g^(-1),with mesopores constituting 36.8% of the structure.Furthermore,the porosities of UIO-66_X can be easily tuned by controlling the molar ratio of EDTA/Zr^(4+).In addition,the as-synthesized UIO-66_X exhibits excellent adsorption capacities for n-hexane(344 mg g^(-1))and pxylene(218 mg g^(-1)),which are 44.5% and 27.5% higher than those of conventional UIO-66,respectively.Finally,the adsorption behavior of n-hexane and p-xylene molecules in UIO-66_X was investigated using density functional theory simulations. 展开更多
关键词 Nanoscale hierarchically porous MOFs Tunable porosities Enhanced VOC adsorption
下载PDF
Facile fabrication of nanoscale hierarchical porous zeolitic imidazolate frameworks for enhanced toluene adsorption capacity 被引量:3
7
作者 Min-Hui Yang Chong-Xiong Duan +6 位作者 Xin-Juan Zeng Jing-Jing Li Cui-Yin Liu Long-Jiao Zeng Yi Zhang Kai Wang Hong-Xia Xi 《Rare Metals》 SCIE EI CAS CSCD 2021年第2期471-477,共7页
The development of a simple and facile synthesis route is a highly desirable but challenging process in the fabrication of nanoscale hierarchical porous zeolitic imidazolate frameworks(ZIFs).Herein we describe a facil... The development of a simple and facile synthesis route is a highly desirable but challenging process in the fabrication of nanoscale hierarchical porous zeolitic imidazolate frameworks(ZIFs).Herein we describe a facile method for rapidly synthesizing hierarchically porous ZIF-90 nanocrystals(particle sizes of~300 nm)using hydroxyl double salts as intermediates at room temperature.The as-synthesized ZIF-90 contained hierarchical porous structures developed using a crystalline interior and a random stack of multiple nanoparticles.Both the morphology and particle size of ZIF-90 nanocrystals could be tuned by controlling the molar ratio of ICA/Zn^(2+).Note that the as-synthesized hierarchically porous ZIF-90 nanocrystals exhibited higher thermal stability compared with the conventional ZIF-90.Because of the introduction of hierarchical porous structures,the resultant hierarchically porous ZIF-90 nanocrystals showed enhanced toluene adsorption capacity than those of conventional metal organic frameworks and zeolites. 展开更多
关键词 Zeolitic imidazolate framework-90 NANOSCALE Green and rapid synthesis Hierarchical porous structure Enhanced toluene adsorption
原文传递
Enhanced adsorption behavior of Nd(III) onto D113-III resin from aqueous solution 被引量:2
8
作者 熊春华 陈昕怡 姚彩萍 《Journal of Rare Earths》 SCIE EI CAS CSCD 2011年第10期979-985,共7页
An enhanced adsorption and desorption procedure of Nd(Ⅲ) onto D113-Ⅲ resin were prepared with various chemical methods. Batch studies were carried out with various pH, contact time, temperature and initial concent... An enhanced adsorption and desorption procedure of Nd(Ⅲ) onto D113-Ⅲ resin were prepared with various chemical methods. Batch studies were carried out with various pH, contact time, temperature and initial concentrations, and then column studies were conducted. The results showed that the optimal adsorption condition was at pH value of 6.90. The process was fast initially and arrived equilibrium within 60 h. The resin exhibited a high Nd(Ⅲ) uptake as 232.56 mg/g at 298 K. The adsorption data fitted well with pseudo-second-order kinetic model. Thermodynamic parameters were studied, which indicated that the adsorption process was spontaneous and endothermic. Thomas model was delineated here to predict the breakthrough curves based on the experimental column study data. In the elution test, 1 mol/L HCl solution could achieve a satisfactory elution rate, which indicated that D113-1/1 resin could be regenerated and reused. Finally, the IR spectroscopic technique was undertaken, and a novel adsorption mechanism was proposed. 展开更多
关键词 Nd(Ⅲ) D113-Ⅲ resin enhanced adsorption novel mechanism rare earths
原文传递
通过构筑异相界面增强对羟基和醛基的吸附来提升生物质电氧化性能 被引量:1
9
作者 郭锦瑜 汪广进 +4 位作者 崔莎莎 夏兵营 刘志娟 臧双全 王双印 《Science China Materials》 SCIE EI CAS CSCD 2023年第7期2698-2707,共10页
Co_(3)O_(4)具有较好的5-羟甲基糠醛(HMF)电氧化(HMFOR)潜力,但本征活性较低.在此,我们通过制备Cu掺杂的Co_(3)O_(4)(Cu-Co_(3)O_(4))和CuO异相界面(Cu-Co_(3)O_(4)/CuO)对Co_(3)O_(4)进行了修饰.随着铜物种的引入,催化剂的电子结构得... Co_(3)O_(4)具有较好的5-羟甲基糠醛(HMF)电氧化(HMFOR)潜力,但本征活性较低.在此,我们通过制备Cu掺杂的Co_(3)O_(4)(Cu-Co_(3)O_(4))和CuO异相界面(Cu-Co_(3)O_(4)/CuO)对Co_(3)O_(4)进行了修饰.随着铜物种的引入,催化剂的电子结构得到了有效调控,电子优先从Co转移到Cu,表明了两组份间强烈的电子相互作用.电化学结果表明,与Cu-Co_(3)O_(4)和纯Co_(3)O_(4)相比,Cu-Co_(3)O_(4)/CuO具有更低的过电位、更快的反应动力学速率和更高的周转频率.实验结果和理论计算表明,由于与醛基和羟甲基的相互作用增强,Cu-Co_(3)O_(4)/CuO对HMF吸附增强.此外,Cu-Co_(3)O_(4)/CuO对呋喃环的吸附依赖相对减弱,加速了对醛基的氧化.本研究为高效HMFOR电催化剂的开发提供了重要参考. 展开更多
关键词 heterophase interface biomass electrooxidation modulated electronic structure enhanced adsorption
原文传递
Preparation of ZnO/GO composite material with highly photocatalytic performance via an improved two-step method 被引量:4
10
作者 Ya-Li Chen Chun-E.Zhang +3 位作者 Chao Deng Peng Fei Ming Zhong Bi-Tao Su 《Chinese Chemical Letters》 SCIE CAS CSCD 2013年第6期518-520,共3页
ZnO/graphene oxide(ZnO/GO) composite material,in which ZnO nanoparticles were densely coated on the GO nanosheets,was successfully prepared by an improved two-step method and characterized by IR, XRD,TEM,and UV-vis ... ZnO/graphene oxide(ZnO/GO) composite material,in which ZnO nanoparticles were densely coated on the GO nanosheets,was successfully prepared by an improved two-step method and characterized by IR, XRD,TEM,and UV-vis techniques.The improved photocatalytic property of the ZnO/GO composite material,evaluated by the photocatalytic degradation of methyl orange(MO) under UV irradiation,is ascribed to the intimate contact between ZnO and GO,the enhanced adsorption of MO,the quick electron transfer from excited ZnO particles to GO sheets and the activation of MO molecules viaπ-πinteraction between MO and GO. 展开更多
关键词 ZnO/GO composite material Improved two-step method Characterization Enhanced adsorptive and photocatalytic property
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部