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Preparation and application of g-C_3N_4-ZnS-DNA nanocomposite with enhanced electrocatalytic activity 被引量:2
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作者 周鑫 邹菁 +2 位作者 张胜 潘敏 龚晚芸 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第2期287-295,共9页
We successfully designed and prepared a g-C3N4-ZnS-DNA nanocomposite by a simple method and systematically investigated its morphology,microstructure,and electrocatalytic properties.The as-prepared g-C3N4-ZnS-DNA nano... We successfully designed and prepared a g-C3N4-ZnS-DNA nanocomposite by a simple method and systematically investigated its morphology,microstructure,and electrocatalytic properties.The as-prepared g-C3N4-ZnS-DNA nanocomposite possessed the electrocatalytic activity of g-C3N4-ZnS and the conductivity of DNA.The presence of DNA was found to enhance the electrocatalytic response of the nanocomposite towards environmental hormones,e.g.pentachlorophenol and nonylphenol,owing to the interaction between g-C3N4-ZnS and DNA,indicating that a stable nanocomposite was formed.The three components showed synergistic effects during electrocatalysis.Electrochemical impedance spectra indicated that the g-C3N4-ZnS-DNA nanocomposite dramatically facilitated the electron transfer of a modified electrode.The co-doping of g-C3N4 film with ZnS and DNA doubled the electrochemical response of the modified electrode in comparison with that of unmodified g-C3N4 film.The detection limits(3 S/N) of pentachlorophenol and nonylphenol were3.3×10^-9 mol L^-1.Meanwhile,we propose a possible Z-scheme mechanism for electron transfer in the g-C3N4-ZnS-DNA nanocomposite and the possible pentachlorophenol and nonylphenol electrocatalytic oxidation mechanism.The g-C3N4-ZnS-DNA nanocomposite-modified electrode was demonstrated to be effective for electrochemical sensing of trace environmental hormones in water samples. 展开更多
关键词 Graphitic carbon nitride Zinc sulfide DNA NANOCOMPOSITE Electrocatalytic activity Environmental hormones
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Intrinsic pentagon defect engineering in multiple spatial-scale carbon frameworks for efficient triiodide reduction
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作者 Siyi Hou Xuedan Song +6 位作者 Chang Yu Jiangwei Chang Yiwang Ding Yingbin Liu Xiubo Zhang Weizhe Liu Jieshan Qiu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第8期20-28,I0002,共10页
Intrinsic topological defect engineering has been proven as a promising strategy to elevate the electrocatalytic activity of carbon materials.However,the controllable construction of high-density and specific topologi... Intrinsic topological defect engineering has been proven as a promising strategy to elevate the electrocatalytic activity of carbon materials.However,the controllable construction of high-density and specific topological defects in carbon frameworks to reveal the relationship between reactivity and defect structure remains a challenging task.Herein,the intrinsic pentagon carbon sites that can favor electron overflow and enhance their binding affinity towards the intermediates of catalytic reaction are firstly presented by the work function and the p-band center calculations.To experimentally verify this,the cage-opening reaction of fullerene is proposed and utilized for synthesizing carbon quantum dots with specific pentagon configuration(CQDs-P),subsequently utilizing CQDs-P to modulate the micro-scale defect density of three-dimensional reduced graphene oxide(rGO)viaπ-πinteractions.The multiple spatial-scale rGO-conjugated CQDs-P structure simultaneously possesses abundant pentagon and edge defects as catalytic active sites and long-range-orderedπelectron delocalization system as conductive network.The defects-rich CQDs-P/rGO-4 all-carbon-based catalyst exhibits superb catalytic activity for triiodide reduction reaction with a high photoelectric conversion efficiency of 8.40%,superior to the Pt reference(7.97%).Theoretical calculations suggest that pentagon defects in the carbon frameworks can promote charge transfer and modulate the adsorption/dissociation behavior of the reaction intermediates,thus enhancing the electrocatalytic activity of the catalyst.This work confirms the role of intrinsic pentagon defects in catalytic reactions and provides a new insight into the synthesis of defects-rich carbon catalysts. 展开更多
关键词 Defect engineering Pentagon carbon Carbon quantum dots Electrocatalytic activity Triiodide reduction
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Electrochemically reduced graphene oxide with enhanced electrocatalytic activity toward tetracycline detection 被引量:4
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作者 胥燕燕 高明明 +4 位作者 张国辉 王新华 李佳佳 王曙光 桑元华 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2015年第11期1936-1942,共7页
An electrochemically reduced graphene oxide sample, ERGO_0.8v, was prepared by electrochemical reduction of graphene oxide (GO) at -0.8 V, which shows unique electrocatalytic activity toward tetracycline (TTC) det... An electrochemically reduced graphene oxide sample, ERGO_0.8v, was prepared by electrochemical reduction of graphene oxide (GO) at -0.8 V, which shows unique electrocatalytic activity toward tetracycline (TTC) detection compared to the ERGO-12v (GO applied to a negative potential of-1.2 V), GO, chemically reduced GO (CRGO)-modified glassy carbon electrode (GC) and bare GC electrodes. The redox peaks of TTC on an ERGO-0.8v-modifled glass carbon electrode (GC/ERGO-0.8v) were within 0-0.5 V in a pH 3.0 buffer solution with the oxidation peak current correlating well with TTC concentration over a wide range from 0.1 to 160 mg/L Physical characterizations with Fourier transform infrared (FT-IR), Raman, and X-ray photoelectron spectroscopies (XPS) demonstrated that the oxygen-containing functional groups on GO diminished after the electrochemical reduction at -0.8 V, yet still existed in large amounts, and the defect density changed as new sp2 domains were formed. These changes demonstrated that this adjustment in the number of oxygen-containing groups might be the main factor affecting the electrocatalytic behavior of ERGO. Additionally, the defect density and sp2 domains also exert a profound influence on this behavior. A possible mechanism for the TTC redox reaction at the GC/ERGO-0.8v electrode is also presented. This work suggests that the electrochemical reduction is an effective method to establish new catalytic activities of GO by setting appropriate parameters. 展开更多
关键词 Electrochemically reduced graphene oxide Electrochemical detection Tetracycline Electrocatalytic activity Oxygen-containing functional groups
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Enhanced electrocatalytic activity for H_2O_2 production by the oxygen reduction reaction: Rational control of the structure and composition of multi-walled carbon nanotubes 被引量:3
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作者 Yi Wang Mi Yi +1 位作者 Kun Wang Shuqin Song 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第4期523-533,M0003,共12页
Hydrogen peroxide(H2O2)is a very useful chemical reagent,but the current industrial methods for its production suffer from serious energy consumption problems.Using high-activity and high-selectivity catalysts to elec... Hydrogen peroxide(H2O2)is a very useful chemical reagent,but the current industrial methods for its production suffer from serious energy consumption problems.Using high-activity and high-selectivity catalysts to electrocatalyze the oxygen reduction reaction(ORR)through a two-electron(2e^-)pathway is a very promising route to produce H2O2.In this work,we obtained partially oxidized multi-walled carbon nanotubes(MWCNTs)with controlled structure and composition by oxidation with concentrated sulfate and potassium permanganate at 40℃ for 1 h(O-CNTs-40-1).The outer layers of O-CNTs-40-1 are damaged with defects and oxygen-containing functional groups,while the inner layers are maintained intact.The optimized structure and composition of the partially oxidized MWCNTs ensure that O-CNTs-40-1 possesses both a sufficient number of catalytic sites and good conductivity.The results of rotating ring disk electrode measurements reveal that,among all oxidized MWCNTs,O-CNTs-40-1 shows the greatest improvement in hydrogen peroxide selectivity(from ~ 30% to ~ 50%)and electron transfer number(from ~ 3.4 to ~ 3.0)compared to those of the raw MWCNTs.The results of electrochemical impedance spectroscopy measurements indicate that both the charge-transfer and intrinsic resistances of O-CNTs-40-1 are lower than those of the raw MWCNTs and of the other oxidized MWCNTs.Finally,direct tests of the H2O2 production confirm the greatly improved catalytic activity of O-CNTs-40-1 relative to that of the raw MWCNTs. 展开更多
关键词 Hydrogen peroxide Oxygen reduction reaction Multi-walled carbon nanotubes Electrocatalytic activity Oxidation treatment
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Synergistic Effects in CNTs-PdAu/Pt Trimetallic Nanoparticles with High Electrocatalytic Activity and Stability 被引量:2
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作者 Xin-Lei Cai Chang-Hai Liu +7 位作者 Jie Liu Ying Lu Ya-Nan Zhong Kai-Qi Nie Jian-Long Xu Xu Gao Xu-Hui Sun Sui-Dong Wang 《Nano-Micro Letters》 SCIE EI CAS 2017年第4期129-138,共10页
We present a straightforward physical approach for synthesizing multiwalled carbon nanotubes(CNTs)-Pd Au/Pt trimetallic nanoparticles(NPs), which allows predesign and control of the metal compositional ratio by simply... We present a straightforward physical approach for synthesizing multiwalled carbon nanotubes(CNTs)-Pd Au/Pt trimetallic nanoparticles(NPs), which allows predesign and control of the metal compositional ratio by simply adjusting the sputtering targets and conditions. The small-sized CNTs-Pd Au/Pt NPs(~3 nm, Pd/Au/Pt ratio of 3:1:2) act as nanocatalysts for the methanol oxidationreaction(MOR), showing excellent performance with electrocatalytic peak current of 4.4 A mg^(-1) Pt and high stability over 7000 s. The electrocatalytic activity and stability of the Pd Au/Pt trimetallic NPs are much superior to those of the corresponding Pd/Pt and Au/Pt bimetallic NPs,as well as a commercial Pt/C catalyst. Systematic investigation of the microscopic, crystalline, and electronic structure of the Pd Au/Pt NPs reveals alloying and charge redistribution in the Pd Au/Pt NPs, which are responsible for the promotion of the electrocatalytic performance. 展开更多
关键词 CNTS PdAu/Pt Trimetallic nanoparticles Methanol oxidation reaction Electrocatalytic activity Synergistic effects
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Enhanced electrocatalytic activity of carbon cloth by synergetic effect of plasma and acid treatment 被引量:2
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作者 Tingting MEI Ming GAO +2 位作者 Danni LIU Yu WANG Yifan HUANG 《Plasma Science and Technology》 SCIE EI CAS CSCD 2021年第2期57-63,共7页
Commercial carbon cloth(CC)is an ideal electrocatalysis material to produce oxygen evolution reaction(OER)due to its high conductive and 3D flexible structure,but the lacked active sites limit its application.For impr... Commercial carbon cloth(CC)is an ideal electrocatalysis material to produce oxygen evolution reaction(OER)due to its high conductive and 3D flexible structure,but the lacked active sites limit its application.For improving its OER performance,the present study proposed an effective method combining plasma and acid treatment to introduce oxygen-containing functional groups and produce more active sites on its surface.Compared to the pristine CC,the plasma and acid treated carbon cloth(PN-CC)delivers a reduced overpotential by 34.6%to achieve current density of 10 mA cm^(−2).The Tafel slope declines from 97.5 mV dec^(–1)(pristine CC)to 55.9 mV dec–1(PN-CC),showing an increased OER kinetic.Additionally,PN-CC electrocatalyst shows outstanding stability after 5000 cycles or 25000 s.The combination of plasma and acid treatment shows a significant potential in surface modification for electrocatalysts. 展开更多
关键词 carbon cloth electrocatalytic activity plasma treatment acid oxidation
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Preparation and Electrocatalytic Activity of Polyaniline-poly (Propylene Oxide) Modified by Pt Nanoparticles 被引量:1
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作者 李美超 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2006年第4期9-11,共3页
The preparation and electrocatalytic activity of polyaniline-poly ( propylene oxide ) ( PAN-PPO ) modified by Pt particles ( Pt/ PAN-PPO ) were investigated. Pt/ PAN-PPO was characterized by scanning electron mi... The preparation and electrocatalytic activity of polyaniline-poly ( propylene oxide ) ( PAN-PPO ) modified by Pt particles ( Pt/ PAN-PPO ) were investigated. Pt/ PAN-PPO was characterized by scanning electron microscopy (SEM) and energy dispersive spectroscopy ( EDS ). Pt particles on PAN-PPO were in the nanometer range, and dispersed in a three-dimensional distribution on the surface of PAN-PPO film. Compared with polyaniline and glassy carbon modified with Pt particles under the same conditions, Pt/PAN-PPO exhibited a high electrocatalytic activity for lysine oxidation. 展开更多
关键词 ANILINE propylene oxide COPOLYMER PLATINUM electrocatalytic activity LYSINE
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Platinum Nanoparticles Supported on Graphite Nanofibers Prepared by Microwave Irradiation and Its Electrocatalytic Activity 被引量:1
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作者 JieZHAO WeiXiangCHEN +2 位作者 GuiHAN YiFanZHENG ZhuDeXU 《Chinese Chemical Letters》 SCIE CAS CSCD 2005年第2期269-272,共4页
Platinum nanoparticles supported on graphite nanofibers (GNFs) were prepared bymicrowave assistant heating polyol process. TEM images showed that microwave prepared Ptnanoparticles supported on GNFs were small and uni... Platinum nanoparticles supported on graphite nanofibers (GNFs) were prepared bymicrowave assistant heating polyol process. TEM images showed that microwave prepared Ptnanoparticles supported on GNFs were small and uniform, and the average diameter was about 3.4nm. Cyclic voltammetric test showed that Pt/GNFs exhibited very high electrocatalytic activity formethanol oxidation. 展开更多
关键词 Platinum nanoparticles graphite nanofibers MICROWAVE electrocatalytic activity.
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Electro-oxidation treatment of Sn/PANI electrode and electrocatalytic activity of Pt/Sn hydroxide/PANI composite electrodes 被引量:1
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作者 周海晖 彭铮 +2 位作者 焦勇刚 廖杰 旷亚非 《Journal of Central South University of Technology》 EI 2008年第5期593-598,共6页
After being electro-oxidized by cyclic voltammetry(CV) method in 0.5 mol/L H2SO4 solution or in 0.2 mol/L H2O2+0.5 mol/L H2SO4 solution, the Sn/polyaniline (PANI) electrodes were modified with Pt microparticles by pul... After being electro-oxidized by cyclic voltammetry(CV) method in 0.5 mol/L H2SO4 solution or in 0.2 mol/L H2O2+0.5 mol/L H2SO4 solution, the Sn/polyaniline (PANI) electrodes were modified with Pt microparticles by pulse galvanostatic method, thus Pt/Sn hydroxide/PANI electrodes were prepared. The electrocatalytic activities of the Pt/Sn/PANI electrode and Pt/Sn hydroxide/PANI electrode for formaldehyde electro-oxidation were investigated by CV method. The effects of deposition charges (Qdep) of PANI, Sn and Pt, scan rate and formaldehyde concentration on the electrocatalytic activity of Pt/Sn hydroxide/PANI electrode were also studied. The results show that the electrocatalytic activities of the Pt/Sn hydroxide/PANI electrodes are much higher than those of the Pt/Sn/PANI electrode. 展开更多
关键词 SN Sn hydroxide FORMALDEHYDE POLYANILINE electrocatalytic activity electro-oxidation
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Electrocatalytic Activity of Ni/C Electrodes Prepared by Metal Vapor Synthesis For Hydrogen Evolution in Alkaline Solution 被引量:1
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作者 Shi Hua WU Chang Ying ZHU and Wei Ping HUANG(Department of Chemistry, Nankai University, Tianjin 300071) 《Chinese Chemical Letters》 SCIE CAS CSCD 1997年第5期435-436,共2页
The metal vapor synthesis (MVS) methed was used to prepare activatedcarbon supported nickel electrode. The electrocatalytic activity of the electrode forhydrogen evolution reaction(HGR) in alkaline solution was studie... The metal vapor synthesis (MVS) methed was used to prepare activatedcarbon supported nickel electrode. The electrocatalytic activity of the electrode forhydrogen evolution reaction(HGR) in alkaline solution was studied. Cathodicpolarization curves showed the electrocatalytic activity of Ni/C electrode prepared byMVS method was higher than that of the one prepared by conventional method. 展开更多
关键词 activity Electrocatalytic activity of Ni/C Electrodes Prepared by Metal Vapor Synthesis For Hydrogen Evolution in Alkaline Solution NI
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Electrocatalytic Activity of Tungsten Carbide and Natural Zeolite Composite in Aqueous Solution
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作者 程媛 谢伟淼 +2 位作者 姚国新 胡素绢 李国华 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第2期254-261,共8页
Tungsten carbide and zeolite nanocomposite was prepared by combining a mechanochemical approach with a reduction and carbonization approach,using natural zeolite and ammonia metatungstate as precursors.The sample was ... Tungsten carbide and zeolite nanocomposite was prepared by combining a mechanochemical approach with a reduction and carbonization approach,using natural zeolite and ammonia metatungstate as precursors.The sample was characterized by X-ray diffraction and scanning electron microscope.The results showed that the crystal phase of the sample is composed of zeolite,monotungsten carbide and bitungsten carbide.The mass percentage and the crystallite diameter of tungsten carbide change along with the reacted time.Its electrocatalytic activity was measured with a microelectrode system with three electrodes.The results show that its electrocatalytic property is related to its crystal phase and the mass percentage of tungsten carbide,and its electrocatalytic activity is connected with the property of electrolyte,in which it is measured.Synergistic effect between tungsten carbide and zeolite is found during electrocatalysis. 展开更多
关键词 tungsten carbide ZEOLITE NANOCOMPOSITE electrocatalytic activity synergistic effect
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Synthesis of monodisperse palladium nanocubes and their catalytic activity for methanol electrooxidation
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作者 丁皓 时雪钊 +6 位作者 申承民 惠超 徐梽川 李晨 田园 王登科 高鸿钧 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第10期370-374,共5页
The single crystalline palladium nanocubes with an average size of 7 nm were prepared in the presence of poly (vinyl pyrrolidone) (PVP) and KBr using the polyol method. The as-prepared Pd nanocubes were highly uni... The single crystalline palladium nanocubes with an average size of 7 nm were prepared in the presence of poly (vinyl pyrrolidone) (PVP) and KBr using the polyol method. The as-prepared Pd nanocubes were highly uniform in both size and shape. The ordered packing structures including monolayer and multilayer can be fabricated via the rate-controlled evaporation of solution solvent. The electrochemical catalytic activity of these Pd nanocubes towards methanol oxidation was found to be higher than that of spherical Pd nanoparticles of similar size. 展开更多
关键词 Pd nanocubes electrocatalytic activity methanol oxidation fuel cell
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THE ELECTROCATALYTIC ACTIVITY OF NiCo2O4 FOR THE OXYGEN EVOLUTION REACTION
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作者 Peng Li CHENG Jian Min ZHANG Qiu Zhi SHI Chang Chun YANG Department of Chemistry,Zhengzhou University,Zhengzhou,450052 《Chinese Chemical Letters》 SCIE CAS CSCD 1993年第9期821-824,共4页
A spinel oxide NiCo204 prepared by thermal decomposition is of very high activity for the oxygen evolution reaction(OER)in alkaline solution.The oxygen evolution overpotential on NiCo204 is 0.252-0.262V in 10 M NaOH s... A spinel oxide NiCo204 prepared by thermal decomposition is of very high activity for the oxygen evolution reaction(OER)in alkaline solution.The oxygen evolution overpotential on NiCo204 is 0.252-0.262V in 10 M NaOH solution at 343K and current density 100 mAcm^(-2). 展开更多
关键词 OEA IM CO OER THE ELECTROCATALYTIC activity OF NiCo2O4 FOR THE OXYGEN EVOLUTION REACTION NI
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Tunable vacancy defect chemistry on free-standing carbon cathode for lithium-sulfur batteries 被引量:2
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作者 Xi Zhang Xiaohong Liu +1 位作者 Wei Zhang Yingze Song 《Green Energy & Environment》 SCIE EI CSCD 2023年第2期354-359,共6页
The defect chemistry is successfully modulated on free-standing and binder-free carbon cathodes for highly efficient Li-S redox reactions.Such rationally regulated defect engineering realizes the synchronization of io... The defect chemistry is successfully modulated on free-standing and binder-free carbon cathodes for highly efficient Li-S redox reactions.Such rationally regulated defect engineering realizes the synchronization of ion/electron-conductive and defect-rich networks on the threedimension carbon cathode,leading to its tunable activity for both relieving the shuttle phenomenon and accelerating the sulfur redox reaction kinetics.As expected,the defective carbon cathode harvests a high rate capacity of 1217.8 mAh g^(-1)at 0.2 C and a superior capacity retention of61.7%at 2 C after 500 cycles.Even under the sulfur mass loading of 11.1 mg cm^(-2),the defective cathode still holds a remarkable areal capacity of 8.5 mAh cm^(-2). 展开更多
关键词 Li–S chemistry Tunable vacancy defects Free-standing cathode Electrocatalytic activity Sulfur redox reaction kinetics
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Oxygen Evolution Behavior of PTFE-F-PbO2 Electrode in H2SO4 Solution 被引量:8
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作者 童少平 张铁明 马淳安 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2008年第6期885-889,共5页
F-PbO2 electrode and polytetrafluoroethylene (PTFE) doped F-PbO2 electrode (PTFE-F-PbO2) were prepared on a plexiglas sheet substrate by a series of procedure including chemical and electrochemical depositions. Th... F-PbO2 electrode and polytetrafluoroethylene (PTFE) doped F-PbO2 electrode (PTFE-F-PbO2) were prepared on a plexiglas sheet substrate by a series of procedure including chemical and electrochemical depositions. The electrochemical activities of these two electrodes for oxygen evolution (OE) reaction were examined by electrochemical tests. In comparison with F-PbO2, PTFE-F-PbO2 electrode exhibited larger active surface area and higher oxygen vacancy deficiency, which resulted in its higher electrocatalytic activity for OE. In addition, both exchange current density and activation energy of the electrodes for OE were calculated in terms of active surface area. The values of exchange current density and activation energy in 0.5 mol·L^-1 H2SO4 aqueous solution were 1.125×10^ -3 mA·cm^-2 and 18.62 kJ·mol^-1 for PTFE-F-PbO2, and 8.384×10^-4 mA·cm^- 2 and 28.98 kJ·mol^-1 for F-PbO2, respectively. Because these values are calculated on the basis of the active surface areas of the electrodes, the enhanced activity of PTFE-F-PbO2 can be attributed to an increase in oxygen vacancy deficiency of PbO2 due to doping by PTFE. The influence of PTFE adulteration on the activity of PbO2 film electrode for OE was investigated in detail in this study. 展开更多
关键词 F-PbO2 polytetrafluoroethylene oxygen evolution electrocatalytic activity
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Application of advanced oxidation processes for removing salicylic acid from synthetic wastewaters 被引量:7
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作者 Djalma Ribeiro da Silva Carlos A.Martinez-Huítle 《Chinese Chemical Letters》 SCIE CAS CSCD 2010年第1期101-104,共4页
In this study,advanced oxidation processes(AOPs) such as anodic oxidation(AO),UV/H_2O_2 and Fenton processes(FP) were investigated for the degradation of salicylic acid(SA) in lab-scale experiments.Boron-doped diamond... In this study,advanced oxidation processes(AOPs) such as anodic oxidation(AO),UV/H_2O_2 and Fenton processes(FP) were investigated for the degradation of salicylic acid(SA) in lab-scale experiments.Boron-doped diamond(BDD) film electrodes using Ta as substrates were employed for AO of SA.In the case of FP and UV/H_2O_2,most favorable experimental conditions were determined for each process and these were used for comparing with AO process.The study showed that the FP was the most effective process under aci... 展开更多
关键词 Advanced oxidation processes Salicylic acid(SA) Anodic oxidation Ta/BDD Electrocatalytic activity
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Effect of cooling ways on properties of Al/Pb-0.2%Ag rolled alloy for zinc electrowinning 被引量:6
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作者 Xiang-yang ZHOU Shuai WANG +4 位作者 Juan YANG Zhong-cheng GUO Jian YANG Chi-yuan MA Bu-ming CHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第9期2096-2103,共8页
In order to study the new anode materials for zinc electrowinning,Al/Pb?0.2%Ag rolled alloy was produced by composite casting and hot rolling.Then the effect of cooling ways on properties of Al/Pb?0.2%Ag rolled alloy ... In order to study the new anode materials for zinc electrowinning,Al/Pb?0.2%Ag rolled alloy was produced by composite casting and hot rolling.Then the effect of cooling ways on properties of Al/Pb?0.2%Ag rolled alloy was investigated.As the results of metallographic test indicated,with the increasing of cooling intensity,both Vickers hardness and yield strength of Al/Pb?0.2%Ag rolled alloy increase.Furthermore,the Al/Pb?0.2%Ag rolled alloy,cooled by ice salt,presents the finest grain size and shows the lowest oxygen evolution potential(1.5902V),while that of alloy cooled by water and air are1.6143V and1.6288V,respectively.However,the corrosion current density and corrosion rate of the Al/Pb?0.2%Ag rolled alloy,cooled by ice salt,are the highest.This can be attributed to its largest specific surface area,which promotes the contact between the anode and electrolyte. 展开更多
关键词 Al/Pb-0.2%Ag rolled alloy cooling way electrocatalytic activity electrochemical property corrosion resistance zinc electrowinning
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Rational design of Cu-based electrocatalysts for electrochemical reduction of carbon dioxide 被引量:4
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作者 Baohua Zhang Jintao Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2017年第6期1050-1066,共17页
The recent development of Cu-based electrocatalysts for electrochemical reduction of carbon dioxide(CO) has attracted much attention due to their unique activity and selectivity compared to other metal catalysts. Pa... The recent development of Cu-based electrocatalysts for electrochemical reduction of carbon dioxide(CO) has attracted much attention due to their unique activity and selectivity compared to other metal catalysts. Particularly, Cu is the unique electrocatalyst for COelectrochemical reduction with high selectivity to generate a variety of hydrocarbons. In this review, we mainly summarize the recent advances on the rational design of Cu nanostructures, the composition regulation of Cu-based alloys, and the exploitation of advanced supports for improving the catalytic activity and selectivity toward electrochemical reduction of CO. The special focus is to demonstrate how to enhance the activity and selectivity of Cubased electrocatalyst for COreduction. The perspectives and challenges for the development of Cu-based electrocatalysts are also addressed. We hope this review can provide timely and valuable insights into the design of advanced electrocatalytic materials for COelectrochemical reduction. 展开更多
关键词 ELECTROCATALYSTS COPPER ALLOY SELECTIVITY CO_2 electrochemical reduction Electrocatalytic activity Faradaic efficiency
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Properties of a new type Al/Pb-0.3%Ag alloy composite anode for zinc electrowinning 被引量:4
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作者 Hai-tao Yang Huan-rong Liu +3 位作者 Yong-chun Zhang Bu-ming Chen Zhong-cheng Guo Rui-dong Xu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2013年第10期986-993,共8页
An A1/Pb-0.3%Ag alloy composite anode was produced via composite casting. Its electrocatalytic activity for the oxygen evolution reaction and corrosion resistance was evaluated by anodic polarization curves and accele... An A1/Pb-0.3%Ag alloy composite anode was produced via composite casting. Its electrocatalytic activity for the oxygen evolution reaction and corrosion resistance was evaluated by anodic polarization curves and accelerated corro- sion test, respectively. The microscopic morphologies of the anode section and anodic oxidation layer during accelerated corrosion test were obtained by scanning electron microscopy. It is found that the composite anode (hard anodizing) dis- plays a more compact interracial combination and a better adhesive strength than plating tin. Compared with industrial Pb-0.3%Ag anodes, the oxygen evolution overpotentials of A1/Pb-0.3%Ag alloy (hard anodizing) and A1/Pb-0.3%Ag alloy (plating tin) at 500 A.m-2 were lower by 57 and 14 mV, respectively. Furthermore, the corrosion rates of Pb-0.3%Ag alloy, A1/Pb-0.3%Ag alloy (hard anodizing), and A1/Pb-0.3%Ag alloy (plating tin) were 13.977, 9.487, and 11.824 g.m-2.h-1, respectively, in accelerated corrosion test for 8 h at 2000 A-m-2. The anodic oxidation layer of A1/Pb-0.3%Ag alloy (hard anodizing) is more compact than Pb-0.3%Ag alloy and A1/Pb-0.3%Ag alloy (plating tin) after the test. 展开更多
关键词 composite anodes corrosion resistance oxygen evolution reaction electrocatalytic activity zinc electrowin-ning
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INVESTIGATION OF SURFACE MORPHOLOGY, STRUCTURE AND ELECTROCATALYTIC PROPERTIES FOR O_2 EVOLUTION OF TITANIUM BASED IrO_2+Ta_2O_5 COATINGS 被引量:3
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作者 J.M Hu J.X. Wu +2 位作者 H.M Meng YR. Zhu D.B. Sun and D.J. Yang(Beijing Corrosion and Protection Center, Open Laboratory of Corrosion, Erosion and Surface Technology,University of Science and Technology Beijing, Beijing 100083, China) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2000年第3期849-856,共8页
Titanium based IrO2 +Ta2O5 oxide anodes with different compositions and pyrolysis temperatures were prepared by termodecompoisition method. By using X-ray diffraction (XRD), the structure and texture coefficient of th... Titanium based IrO2 +Ta2O5 oxide anodes with different compositions and pyrolysis temperatures were prepared by termodecompoisition method. By using X-ray diffraction (XRD), the structure and texture coefficient of the coatings, TC(hkl), of IrO2 rutile crystal have been tested. It showed that, the crystallization processes of IrO2 and Ta2O5 in xIrO2 +(100-x) Ta2 O5 (x is in mol%) films affected and confined each other.In the mixed system, IrO2 rutile phase existed as a solid solution with Ta, and attained the maximum solubility when x=70mol%, i.e. for the coating of 70% IrO2 +Ta2O5.For the coatings of low iridium content or at low preparing tem pemture, (110) and (101) pwtered orientations were dominant. However, preferred growth of IrO2 weakened with increasing either iridium content or temperature. Three typical surface morphologies were observed by using scanning electron tnicroscopy(SEM). The crystallite size of the mixed oxide coatings were finest for the the film of 70%IrO2 +30%Ta2O5,and decreased with the pyrolysis tempemture. As the results of the finest crystallite segregating on sudece and the maxitnum solid solubility of Ir and Ta component in deposits, the coatings with the composition of 70%IrO2 +Ta2O5 prepared at 450℃ presented the mdrimutn electrocatalgtic activitg for O2 evolution in 0. 5M H2SO4 solution.UP to 550℃, Ti base suffered to oxidation resulting in decreasing anode conductivity,therefore, coatings performed a low activity. 展开更多
关键词 titanium based coating anode iridium oxide tantalum oxide solid solution crystallite orientation electrocatalytic activity
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