酸性溶液中钯催化醇电化学氧化的研究  

An in situ Fourier Transform Infrared Spectroelectrochemical Study on Alcohols Electrocatalytic Oxidation at Pd Electrode in Acidic Solution

作　　者：黄海萍[1] 王连芹[1] 沈培康[1] 

机构地区：[1]中山大学广东省低碳化学与过程节能重点实验室 光电材料与技术国家重点实验室,广东广州510275

出　　处：《电化学》2010年第3期290-295,共6页Journal of Electrochemistry

基　　金：国家863项目(2009AA05Z110,2009AA034400)资助

摘　　要：应用电化学循环伏安法(CV)和现场红外光谱(FTIR),研究了酸性溶液中钯催化甲醇、乙二醇电氧化的过程.结果表明:在酸性和中性介质中,甲醇和乙二醇在多晶Pd电极上氧化须在1.5V以上才能发生.随着溶液pH值的降低,过电位减小且峰电流密度上升.溶液的pH值以及电极表面形成的吸附含氧物种对Pd电催化氧化醇有显著的影响.现场红外光谱电化学测试显示,在高电位和强酸性介质中,乙二醇在Pd电极上的氧化产物主要是CO2和少量的乙二酸.在酸性和中性介质中,无论在低电位或高电位,甲醇和乙二醇在Pd上氧化的主要产物是CO2,没有发现CO的存在,说明该氧化过程CO2是经过非毒化的路径产生的.The methanol and ethylene glycol electrooxidation on palladium electrode in acidic solution has been investigated by cyclic voltammetry and in situ Fourier transform infrared spectroelectrochemistry. It shows that the oxidation of methanol and ethylene glycol at Pd electrode cannot proceed until over 1. 5 V in acidic and neutral media. The overpotential decreases and the peak current density increases with the reduction in pH values. The formation of the oxygen-containing species significantly affects the alcohol oxidation on Pd electrode. The in situ FTIR spectroscopic measurements show that the oxidation products of ethylene glycol on Pd electrode are CO2 and oxalic acid at high potentials and concentrated acid solution. However,the dominant product is CO2 for the oxidation of both methanol and ethylene glycol in acidic and neutral solutions,indicating that the pathway of methanol or ethylene glycol oxidation is a non-poisoning process.

关 键 词：电催化 钯 甲醇 乙二醇 现场电化学红外光谱 

分 类 号：O646.54[理学—物理化学]