一体式再生燃料电池双效膜电极的研究  

Study of bifunctional membrane electrode assembly for unitized regenerative fuel cell

作　　者：张新荣[1] 童莉[1] 孙毅[1] 王涛[1] 张伟[1] 刘向[1] 

机构地区：[1]上海空间电源研究所,上海200233

出　　处：《电源技术》2010年第9期915-918,共4页Chinese Journal of Power Sources

基　　金：国家高技术研究发展计划(007AA05Z130)

摘　　要：对一体式再生燃料电池双效膜电极进行研究,重点考查了膜电极制备工艺、双效电极催化剂和扩散层材料的影响,并用(SEM)对膜电极表面结构进行表征。结果表明:采用CCM工艺制备的双效复合膜电极表现出优异的燃料电池和水电解双功能特性以及循环稳定性,在燃料电池模式运行时,工作电压为0.708 V@1 000 mA/cm2;水电解模式运行时,工作电压为1.623 V@1 000 mA/cm2,URFC循环运行100 h,电池表现出良好的稳定性。膜电极表面结构和极化特性分析表明:CCM膜电极制备工艺实现了催化层和质子交换膜的一体化,改善了电极与质子交换膜界面稳定性,提高了膜电极的电性能和循环稳定性。IrO2扩散层提高了膜电极在高电解电位下的耐蚀性能,促进了膜电极在循环运行中的稳定性。Bifunctional membrane exchange assembly（MEA） for unitized regenerative polymer electrolyte fuel cell（URFC） was developed.MEA preparation technology,bifunctional electrocatalyst and gas diffusion layer materials were examined.The morphology and structure of MEA were characterized by SEM.The results show that bifunctional MEA preparation by catalyst coated on membrane（CCM） technology with bifunctional electrocatalyst and the corrosion-resistive gas diffusion layer（GDL） exhibited the promising URFC performance.The working voltage was 0.708 V@1 000 mA/cm2 under fuel cell mode;the working voltage was 1.623 V@1 000 mA/cm2 under water electrolysis mode.The URFC performance was stable during cycling operating 100 h of the URFC system.The SEM characterization of MEA and polarization curves of URFC results demonstrate that CCM technology enhances the contact between the catalyst layer and proton membrane and stabilizes the catalyst layer and improves the durability of MEA.The protective diffusion layer enhances the corrosion-resistive performance in water electrolysis mode and improves the cycle stability of MEA.

关 键 词：一体式再生燃料电池 双效膜电极 双效电催化剂 耐腐蚀扩散层 

分 类 号：TM911.4[电气工程—电力电子与电力传动]