(1. 湖南科技大學(xué) 化學(xué)化工學(xué)院，湘潭 411201；
2. 中南大學(xué) 化學(xué)化工學(xué)院，長(zhǎng)沙 410083)
摘 要: 以水熱法制備出納米多孔網(wǎng)狀鈀催化劑(nanoPd)，采用電位掃描在其上沉積金，制成金修飾納米鈀電極(Au/nanoPd)，運(yùn)用循環(huán)伏安法(CV)、線性掃描(LSV)和交流阻抗譜(EIS)比較nanoPd和Au/nanoPd電極對(duì)甲酸氧化反應(yīng)的電催化活性。CV和LSV結(jié)果表明：金在nanoPd表面的沉積促進(jìn)鈀對(duì)甲酸氧化的電催化活性，起始電位提前，電流密度更高。EIS研究結(jié)果也表明：在Au/nanoPd電極上，甲酸氧化反應(yīng)的電荷傳遞電阻更低。結(jié)果表明：金修飾納米鈀電極(Au/nanoPd)對(duì)甲酸氧化具有較高的電催化活性。
關(guān)鍵字: 納米鈀；金修飾；甲酸氧化；燃料電池
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
