(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)
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。
关键字: 纳米钯；金修饰；甲酸氧化；燃料电池
electrode for formic acid oxidation
（1. School of Chemistry and Chemical Engineering, Hunan University of Science and Technology,
Xiangtan 411201, China;
2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:A novel nanoporous network palladium electrode (nanoPd) was successfully prepared by a hydrothermal method, then a gold-modified nanoparticle palladium electrode (Au/nanoPd) 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.
Key words: nanoporous palladium; gold-modified; formic acid oxidation; fuel cell
