直接甲醇燃料电池参比电极的设计与稳定性  

Design and stability of reference electrode in direct methanol fuel cell

作　　者：毛庆[1] 孙公权[1] 赵新生[1] 杨少华[1] 辛勤[1] 

机构地区：[1]中国科学院大连化学物理研究所

出　　处：《化工学报》2006年第11期2699-2704,共6页CIESC Journal

基　　金：国家高技术研究发展计划项目(2003AA517040);中国科学院知识创新工程领域前沿项目(K2003D2);国家科技攻关项目(2004BA907A43).~~

摘　　要：提出了用于原位测量直接甲醇燃料电池(DMFC)极化的参比电极的结构设计,并考察了电解质的润湿程度对参比电极的电位及其电位稳定性的影响.结果表明:在可逆氢电极(RHE)作为参比电极的DMFC中,RHE的电位随电解质润湿程度的增加而降低,其电位的稳定性主要取决于其表面状态的稳定性.提出要获得电位稳定及测量准确的极化曲线,RHE处的电解质应处于对侧液态水润湿的状态,且电极表面要有适量、稳定流速的氢气.A novel design of reference electrode was developed to in-situ measure the polarization of direct methanal fuel cell （DMFC）. The effect of humidification conditions of electrolyte on the reference electrode potential and its potential stability was investigated. The experiment results showed that the potential of reversible hydrogen electrode （RHE）, acting as the reference electrode of DMFC, decreased with increasing degree of electrolyte humidification. It was found that the potential stability of RHE was mainly determined by the stability of its surface state. To obtain stable and accurate polarization curves, it was suggested that the electrolyte located on RHE should be humidified by liquid water on its opposite side and the flow rate of H2 should be controlled at an appropriate and stable value.

关 键 词：直接甲醇燃料电池(DMFC) 参比电极 稳定性 

分 类 号：TM911[电气工程—电力电子与电力传动]