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电化学(中英文) ›› 2006, Vol. 12 ›› Issue (4): 434-438. 

• 研究论文 • 上一篇    下一篇

银在质子交换膜燃料电池空气阴极内促进氧传递研究

徐洪峰;董建华;侯向理;   

  1. 大连交通大学环境与化学工程学院,大连交通大学环境与化学工程学院,大连交通大学环境与化学工程学院 辽宁大连116028,辽宁大连116028,辽宁大连116028
  • 收稿日期:2006-11-28 修回日期:2006-11-28 出版日期:2006-11-28 发布日期:2006-11-28

Facilitated Effect of Ag to Oxygen Transportation in PEM Fuel Cell Air Cathodes

XU Hong-feng~*,DONG Jian-hua,HOU Xiang-li   

  1. (Dept.of Environmental& Chemical Eng.,Dalian Jiaotong University,Dalian 116028,Liaoning,China
  • Received:2006-11-28 Revised:2006-11-28 Published:2006-11-28 Online:2006-11-28

摘要: 利用离子交换及随后的氢还原,将单质银负载在质子交换膜(Nafion)孔道内.TEM、XRD表征载银Nafion膜的结构,电化学极限电流法测定氧在载银Nafion膜内的扩散系数.结果表明,因银晶颗粒大于Nafion孔道直径,致使Nafion孔道有所扩张;氧在载银Nafion膜内的扩散系数是无银Nafion膜的4倍.据此,把银引入质子交换膜燃料电池空气阴极催化剂表面的Nafion薄层,则电池的性能在高电流密度下有明显的提高,显示了银对该电极内氧传递的促进作用.

关键词: 质子交换膜, 燃料电池, 银, 促进传递

Abstract: Silver(Ag) was deposited in the pores of Nafion membrane by ion exchange and succedent hydrogen reduction;the structures of Nafion-Ag membrane were measured by TEM and XRD,the diffusion coefficients of oxygen in Nafion-Ag was determined by electrochemical limited current method.The results showed that after deposited silver,the pores in the Nafion were enlarged by silver grains;the oxygen diffusion coefficient was increased about four times.By introducing silver in the thin Nafion film around the cathode catalyst,the performance of PEM fuel cell have a evident increasing in high current density, which shows the facilitated effects of silver to oxygen transportation in PEM fuel cell.

Key words: Proton exchange membrane, Fuel cell, Silver, Facilitated transportation

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