2-吡啶甲酸在玻碳电极表面的电化学行为  

Electrochemical Behavior of 2-Picolinic Acid on Glassy Carbon Electrode

作　　者：张普信[1] 刘文涵[1] 滕渊洁[1] 姚建花[1] 马淳安[1] 

机构地区：[1]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,杭州310032

出　　处：《理化检验（化学分册）》2013年第4期382-385,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：浙江省科技厅公益项目/分析测试基金(2009F70001;2012C37014);浙江省重点科技创新团队(2011R09002-12)资助

摘　　要：在乙酸-乙酸钠缓冲溶液中,利用循环伏安法与线性扫描伏安法研究了2-吡啶甲酸在玻碳电极上的电化学行为。通过数值拟合,确定了2-吡啶甲酸在不同酸度下离解状态的分布,探讨了扫描速率、浓度等因素对其电化学特性的影响,并对其在玻碳电极表面的电极反应机理进行了推断。研究结果表明,2-吡啶甲酸在玻碳电极上发生的是一个不可逆的电化学还原反应,电极过程表现为吡啶环上的羧基的电化学还发生两个电子的转移生成醛。In an acetate buffer solution, the electrochemical behavior of 2-picolinic acid at glassy carbon electrode was studied by cyclic voltammetry and linear sweeping voltammetry. Distribution of various forms of dissociation of 2-picolinic acid in media of different pH was confirmed based on numerical fitting; and influences of scanning rate and concentration on electrochemical characteristics were discussed. Besides, the mechanism of the reaction of 2-picolinic acid at glassy carbon electrode was deduced. It was found that the reaction of 2-picolinic acid at glassy carbon deetrode was an irreversible reduction process, showing the reduction of the carboxy group attached to the pyridyl ring to aldehyde group through transferring of 2 electrons.

关 键 词：2-吡啶甲酸 电化学行为 玻碳电极 伏安法 

分 类 号：O657[理学—分析化学]