二甲醚在pt系催化剂上的电氧化行为初探-高校化学工程学报.pdfVIP

第19 卷第4 期 高 校 化 学 工 程 学 报 No.4 Vol.19 2005 年 8 月 Journal of Chemical Engineering of Chinese Universities Aug. 2005 文章编号：1003-9015(2005)04-0493-05 二甲醚在Pt 系催化剂上的电氧化行为初探 赵 静, 尹鸽平, 邵玉艳, 高云智 (哈尔滨工业大学 应用化学系, 黑龙江 哈尔滨 150001) 摘 要：本实验用化学浸渍-还原法，甲醛为还原剂制备直接二甲醚燃料电池阳极催化剂。用循环伏安法和稳态极 化法，采用粉末微电极技术，研究二甲醚在自制Pt/C 、PtSn/C 和PtRu/C 催化剂上的氧化行为。研究结果显示，二 甲醚在PtRu/C 上有较佳的反应活性。在 PtRu/C 催化剂上考察温度对于二甲醚电氧化的催化活性的影响，得出温 度的升高有利于二甲醚电氧化的进行。 关键词：直接二甲醚燃料电池；电氧化；Pt 系催化剂；粉末微电极 中图分类号：TM 911.4 文献标识码：A Electrooxidation of Dimethyl Ether on Pt and Pt Alloy Catalysts ZHAO Jing, YIN Ge-ping, SHAO Yu-yan, GAO Yun-zhi (Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, China) Abstract ：Anode electrocatalysts Pt/C, PtSn/C (Pt:Sn= 3:2) and PtRu/C (Pt:Ru=1:1) for direct dimethyl ether fuel cell (DDFC) were prepared by chemical impregnating-reduction method with formaldehyde as the reductant. Using the prepared electricatalysts powder to form the powder filled micro-cavity anode electrodes, the electrocatalysts were investigated by cyclic voltammetry (CV) and quasi-steady state polarization. The preliminary conclusion is drawn that among the three prepared electrocatalysts, Pt alloy catalysts, especially PtRu/C, shows the highest performance for dimethyl ether electrooxidation, as in the case of methanol electrooxidation. Effect of temperature on PtRu/C catalytic activity for dimethyl ether oxidation was also investigated. It shows that increase in temperature favors the electrooxidation and adsorption of dimethyl ether, which implicates that adsorption of dimethyl