物理化学学报 >> 2009, Vol. 25 >> Issue (12): 2450-2454.doi: 10.3866/PKU.WHXB20091134

研究论文 上一篇    下一篇

硅钨酸修饰碳载Pd催化剂对甲酸氧化的电催化性能

杨改秀, 陈婷婷, 唐亚文, 陆天虹   

  1. 江苏省生物功能材料重点实验室, 南京师范大学化学与环境科学学院, 南京 210097; 南通大学化学化工学院, 江苏 南通 226019
  • 收稿日期:2009-06-16 修回日期:2009-08-05 发布日期:2009-11-27
  • 通讯作者: 陆天虹 E-mail:tianhonglu@263.net

Electrocatalytic Performance of Silicotungstic Acid Modified Carbon Supported Pd Catalyst for Oxidation of Fomic Acid

YANG Gai-Xiu, CHEN Ting-Ting, TANG Ya-Wen, LU Tian-Hong   

  1. Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Environmental Science, Nanjing Normal University, Nanjing 210097, P. R. China; School of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, Jiangsu Province, P. R. China
  • Received:2009-06-16 Revised:2009-08-05 Published:2009-11-27
  • Contact: LU Tian-Hong E-mail:tianhonglu@263.net

摘要:

用络合还原法合成了用作直接甲酸燃料电池(DFAFC)中阳极碳载Pd(Pd/C)催化剂, 并研究了电解液中的硅钨酸(SiWA)对甲酸在Pd/C催化剂电极上氧化的促进作用. 结果表明, SiWA不但能提高Pd/C催化剂对甲酸氧化的电催化活性, 而且能增加电催化稳定性. 这种促进作用与SiWA浓度有关. 当SiWA浓度为0.40 g·L-1时, 促进作用最佳. 当SiWA浓度大于0.40 g·L-1时, 由于过多的SiWA吸附在Pd/C催化剂上而覆盖了部分Pd活性位点, 反而会降低促进作用. 另外, 由于SiWA在Pd/C催化剂上的吸附, 降低了CO的吸附量, 提高了Pd/C催化剂对甲酸氧化的电催化稳定性, 也促进了甲酸通过直接途径氧化.

关键词: 直接甲酸燃料电池, 硅钨酸, 碳载Pd催化剂, 电催化性能, 促进作用

Abstract:

The carbon supported Pd (Pd/C) anodic catalyst in the direct formic acid fuel cell (DFAFC) was prepared with the complex reduction method and the promote action of silicotungstic acid (SiWA) in the electrolyte for the oxidation of formic acid at the Pd/C catalyst was investigated. It was found that SiWA could increase the electrocatalytic activity and stability for the oxidation of formic acid. The promote action is related to the SiWA concentration. When the SiWA concentration is 0.40 g·L-1 the promote action is the largest. However, when the SiWA concentration is higher than 0.40 g·L-1, overfull adsorbed SiWA would cover too much active points of the Pd/C catalyst, leading to a decrease in the promote action of SiWA. In addition, because the adsorption of SiWA on the Pd/C catalyst decreases the adsorption strength of CO on the Pd/C catalyst, SiWA could increase the electrocatalytic stability of the Pd/C catalyst for the oxidation of formic acid and also promote the oxidation of formic acid through the direct route.

Key words: Direct formic acid fuel cell, Silicotungstic acid, Carbon supported Pd catalyst, Electrocatalytic performance, Promote action

MSC2000: 

  • O64