物理化学学报 >> 2007, Vol. 23 >> Issue (06): 932-934.doi: 10.3866/PKU.WHXB20070627

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AgNi合金作为直接硼氢化物燃料电池的阳极催化剂

冯瑞香; 曹余良; 艾新平; 杨汉西   

  1. 武汉大学化学与分子科学学院, 武汉 430072

  • 收稿日期:2006-11-23 修回日期:2007-01-15 发布日期:2007-06-04
  • 通讯作者: 杨汉西 E-mail:ece@whu.edu.cn

AgNi Alloy Used as Anodic Catalyst for Direct Borohydride Fuel Cells

FENG Rui-Xiang; CAO Yu-Liang; AI Xin-Ping; YANG Han-Xi   

  1. College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, P. R. China

  • Received:2006-11-23 Revised:2007-01-15 Published:2007-06-04
  • Contact: YANG Han-Xi E-mail:ece@whu.edu.cn

摘要:

采用机械球磨法制备银镍合金, 并将其用作直接硼氢化物燃料电池(DBFC)的阳极催化剂. XRD 和SEM实验表明, 这种催化剂为纳米粒子集聚的微米颗粒, 具有二元合金的典型结构特征. 电化学实验表明, AgNi合金不仅能够催化硼氢化物的直接电化学氧化, 而且可以抑制硼氢化物的化学水解. 当采用AgNi/C作为DBFC电池的阳极催化剂时,硼氢化钾的放电容量在3500 mAh·g-1以上, 对硼氢化物燃料的利用率可达90%以上.

关键词: 银镍合金, 机械球磨, 硼氢化物, 燃料电池

Abstract:

AgNi alloy power was prepared as anodic catalyst for direct borohydride fuel cells by mechanical ball-milling method. The XRD and SEMevidences revealed that the alloy powder was composed of nanosized crystallites aggregated into micrometer particles. It was found from electrochemical experiments that the AgNi catalyst could not only catalyze the direct electrochemical oxidation of borohydride ions, but also depress the chemical hydrolysis of borohydride ions, so as to produce a discharge capacity of KBH4 over 3500 mAh·g-1, which corresponded to a 90% utilization of the BH-4 ions as anodic fuel.

Key words: AgNi alloy, Mechanical ball-milling, Borohydride, Fuel cells

MSC2000: 

  • O643