金修饰纳米多孔Pd催化剂对甲酸氧化的电催化活性  

Electrocatalytic activity of Au modified nanoporous palladium electrode for formic acid oxidation

作　　者：牛凤娟[1] 易清风[1] 刘云清[2] 

机构地区：[1]湖南科技大学化学化工学院,湘潭411201 [2]中南大学化学化工学院,长沙410083

出　　处：《中国有色金属学报》2011年第8期1974-1979,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(20876038);湖南省科技发展项目(2009GK3084);湖南省自然科学省市联合基金资助项目(10JJ9003)

摘　　要：以水热法制备出纳米多孔网状钯催化剂(nanoPd),采用电位扫描在其上沉积金,制成金修饰纳米钯电极(Au/nanoPd),运用循环伏安法(CV)、线性扫描(LSV)和交流阻抗谱(EIS)比较nanoPd和Au/nanoPd电极对甲酸氧化反应的电催化活性。CV和LSV结果表明:金在nanoPd表面的沉积促进钯对甲酸氧化的电催化活性,起始电位提前,电流密度更高。EIS研究结果也表明:在Au/nanoPd电极上,甲酸氧化反应的电荷传递电阻更低。结果表明:金修饰纳米钯电极(Au/nanoPd)对甲酸氧化具有较高的电催化活性。A novel nanoporous network palladium electrode （nanoPd） was successfully prepared by a hydrothermal method, then a gold-modified nanoparticle palladium electrode （AulnanoPd） was subsequently fabricated through electrodepositing gold on the nanoPd electrode using a potential scan process. The electrocatalytic activities of the nanoPd and Au/nanoPd towards formic acid in alkaline solution were evaluated by cyclic voltammetry （CV） and electrochemical impedance spectroscopy （EIS）. CV results reveal that Au/nanoPd present a low onset potential and high anodic peak densities, which shows that the deposited gold on nanoPd electrode can enhance the palladium catalyst for formic acid electrooxidation activity. Also Nyquist plots indicate that the formic acid electrooxidation on the Au/nanoPd exhibits low impedance values. The results show that the prepared Au/nanoPd electrode is an effective electrocatalyst towards formic acid oxidation in alkaline media.

关 键 词：纳米钯 金修饰 甲酸氧化 燃料电池 

分 类 号：O646[理学—物理化学]