质子交换膜燃料电池用梯度结构气体扩散电极  

A gradient structure gas diffuse electrode for proton exchange membrane fuel cell

作　　者：董明全[1] 张华民[1] 马海鹏[1] 邱艳玲[1] 

机构地区：[1]中国科学院大连化学物理研究所,辽宁大连116023

出　　处：《电池》2010年第4期191-193,共3页Battery Bimonthly

基　　金：国家"863"计划项目(2008AA05Z106);大连市科技计划项目(2008A116GX141)

摘　　要：依次用m(Pt)∶m(Nafion)=0.4∶0.8、0.6∶0.6、0.8∶0.4和1.0∶0.2的催化剂料液分层涂覆,制备了梯度结构气体扩散电极;通过伏安曲线、扫描电镜(SEM)和循环伏安(CV)等方法,研究了电极结构对质子交换膜燃料电池(PEMFC)性能的影响。该梯度结构电极具有电子传导速度快、质子传递通道多的特点,催化剂Pt的利用率比亲水电极提高了32%,且能扩大催化反应的三相界面,提高PEMFC的性能。在电流密度为500 mA/cm2、1 000 mA/cm2时,使用梯度结构电极的PEM-FC的电压比使用亲水电极的分别高6.9%、13.7%。A gradient structure gas diffuse electrode was made by layer-by-layer coating with catalyst ink in order of m （Pt） ： m（Nafion） = 0.4：0.8,0.6：0.6,0.8：0.4 and 1.0：0.2. The effects of electrode structure to the performance of the proton exchange membrane fuel cell（PEMFC） were studied by the methods of voltage-current curves, scanning electrochemical microscopy （SEM） and cyclic voltammetry（CV）. The gradient electrode had the characteristics such as high electron conductance and abun- dance proton-conducting channel. In gradient electrode, the utilization of catalyst Pt was increased 32% than the hydrophilic elec- trode. The three phase boundary of catalytic reaction was enlarged and the performance of the PEMFC was improred. Compared with the cell using hydrophih＇c electrode, the voltage of PEMFC using gradient electrode enhanced 6.9% and 13.7% at the current density of 500 mA/cm2 and 1 000 mA/cm2, respectively.

关 键 词：气体扩散电极 梯度电极 亲水电极 

分 类 号：TM911.4[电气工程—电力电子与电力传动]