Electrochemical Reduction of Nitrobenzene on the WC Electrode in Acidic Solution

　以聚四氟乙烯为粘接剂制成碳化钨(WC)电极.采用循环伏安法、线性扫描法和恒电位阶跃法研究了硝基苯在酸性溶液中WC电极上的电化学行为.实验表明:WC电极对硝基苯的还原具有较好的活性,电极过程受扩散和电化学步骤混合控制;表观活化能为23.7kJ·mol 1,其中,电化学步骤的活化能10.91kJ·mol 1.The tungsten carbide (WC) electrode was constructed by using polyterafluoroethylene as binder. The electrochemical behavior of nitrobenzene on the WC electrode in acidic solution was investigated by cyclic voltammetry, linear scan method and chronoamperometry. Experimental results showed that WC electrode had good activity for the electrochemical reduction of nitrobenzene, and the electrode process was controlled by diffusion and electrochemical stepssimultaneously. The apparent active energy of the electrode process is 23.7kJ mol~(-1), while the active energy of the electrochemicalstep is 10.91kJ mol~(-1).作者联系地址：浙江工业大学应用化学系,浙江工业大学应用化学系,浙江工业大学应用化学系,浙江工业大学应用化学系 浙江杭州310032 ,浙江杭州310032 ,浙江杭州310032 ,浙江杭州310032Author's Address: *,CHU You-qun,ZHU Ying-hong,XU Zhi-hua Department of Applied Chemistry, Zhejiang University of Technology, Hangzhou 310032,Chin

A Comparative Study of Ce3+/Ce4+ Redox Couple on Pt Electrode in Sulfuric Acid and Methanesulfonic Acid

采用循环伏安法和线性扫描法研究了硫酸和甲磺酸介质中Ce3+/Ce4+在Pt旋转圆盘电极（RDE）上的电化学性能，初步探索了Ce3+/Ce4+的络合行为，考察了Ce3+反应的交换电流密度、扩散系数以及反应速率常数，比较了两种酸介质中Ce3+在Pt电极氧化的活化能. 结果表明，硫酸介质中以Ce4+的络合为主，其平衡电位负移；甲磺酸介质中以Ce3+的络合为主，其平衡电位正移. 硫酸介质中Pt电极上Ce3+更容易氧化为Ce4+, 硫酸铈(III)的电氧化对温度更为敏感.The electrochemical oxidations of Ce3+ to Ce4+ on Pt rotating disk electrode (RDE) in both sulfuric acid and methanesulfonic acid (MSA) solutions were studied by using cyclic voltammetry and linear sweep voltammetry. The complexing behaviors of Ce3+/Ce4+ were preliminarily probed and the exchange current density, diffusion coefficient, as well as reaction rate constant were obtained from Butler-Volmer equation. The activation energies of Ce3+ oxidation on Pt electrode in two types of acidic media, obtained from Arrhenius equation, were also compared. The results indicate that Ce3+ can be oxidized to Ce4+ much easier in sulfuric acid than in MSA solutions. The equilibrium potential in sulfuric acid solutions moves negatively due to the predominant complexation of Ce4+, while that in MSA solutions positively because of the predominant complexation of Ce3+, The larger values of activation energy for the oxidation of Ce3+ to Ce4+ on Pt electrode in sulfuric acid solutions suggest that the oxidation of Ce3+ occurs more readily and the electro-oxidation of cerous sulfate is more susceptible to temperature.浙江省研究生教育创新基地基金项目（No. 1001）资助作者联系地址：浙江工业大学 绿色化学合成技术国家重点实验室培育基地，浙江 杭州 310014Author's Address: State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, China通讯作者E-mail：[email protected]

纪念马淳安教授

2016年12月30日凌晨2时55分，浙江工业大学原副校长、绿色化学合成技术国家重点实验室培育基地主任、中国化工学会精细化工专业委员会副主任委员、全国有机电化学与电化学工业联合会理事长马淳安教授在杭州走完了他65年的人生历程。马淳安教授一生致力于电化学和电化学工程领域的教学、科研和成果转化工作，他的逝世，是我国电化学行业的重大损失。他生命不止、学习不止、思考不止和奋斗不止的精神值得我们永远学习!作者联系地址：中国有机电化学与电化学工业联合