钯镍合金薄膜电极上甲酸电氧化-去合金化效应  

Electrooxidation of Formic Acid on Pd-Ni Alloy Film Electrode-The Effect of Dealloying

作　　者：王超[1] 史菲菲[1] 王金意[1] 张涵轩[1] 蔡文斌[1] 

机构地区：[1]复旦大学上海市分子催化和功能材料重点实验室,化学系,上海200433

出　　处：《电化学》2009年第4期377-381,共5页Journal of Electrochemistry

基　　金：国家自然科学基金(20833005,20873031);上海市科委(08JC1402000)资助

摘　　要：在含PdC l2、N iSO4和乙二胺的弱碱性镀液中,于Au电极上用恒电位电沉积Pd-N i合金薄膜,后经酸性溶液中循环伏安法处理,得到去合金化的Pd-N i电极.扫描电镜以及电化学测试表明,去合金化处理使Pd-N i镀膜表面微观粗糙度增加,比表面积增大;ICP-AES和XPS分析证实合金表层N i的优先溶出造成Pd的富集.去合金化处理的Pd-N i电极电催化氧化甲酸的活性明显优于未处理的Pd-N i电极和多晶Pd电极.A Pd-Ni alloy film was electrodeposited on Au disc electrode at a constant potential from a weakly basic bath containing PdCl2, NiSO4 and ethylenediamine. The as-deposited film was then subjected to potential cycling in a perchloric acid solution for surface dealloying treatment. The dealloyed Pd-Ni film electrode was examined for the electrocatalytic oxidation of formic acid, and compared with the as-deposited one as well as a Pd film electrode. The FE-SEM and electrochemical measurements on the Pd-Ni films revealed that the dealloying treat- ment caused a surface roughening and an increase in specific surface reaction area. The ICP-AES and XPS analyses demonstrated that the preferential dissolution of Ni in the dealloying treatment led to a Pd-rich outer layer in the resultant Pd-Ni film. The electrocatalysis measurements indicated that the dealloyed Pd-Ni electrode is superior to the as-deposited Pd-Ni as well as the Pd electrode in terms of the electro-oxidation of formic acid.

关 键 词：钯镍合金 去合金化 甲酸 电催化 

分 类 号：O646.54[理学—物理化学]