催化剂浆料分散对转印法制备PEMFC性能的影响  

Influence of dispersion of catalyst inks on performance of PEMFC prepared by decal transfer

作　　者：梁晓璐[1,2] 潘国顺[1,2] 徐莉[1,2] 汪嘉澍[1] 

机构地区：[1]清华大学摩擦学国家重点实验室,北京100084 [2]深圳清华大学研究院深圳市微纳制造重点实验室,广东深圳518057

出　　处：《电源技术》2015年第4期756-758,797,共4页Chinese Journal of Power Sources

基　　金：清华大学自主科研计划(20101081907);国家自然科学基金项目(91223202);国家重点基础研究发展计划"973"计划(2011CB013102);国家国际科技合作专项(2011DFA73410)

摘　　要：转印法是有效制备膜电极的方法之一,具有界面电阻小、可大规模生产等优点。采用乙二醇作为催化剂浆料的增稠剂、去离子水和异丙醇作为分散溶剂,实现膜电极的低温完全转印。利用超声波清洗机、磁力搅拌器和均质机,以不同的处理方式对浆料进行分散,考察了浆料的分散方式及分散程度对质子交换膜燃料电池性能的影响。通过场发射电子显微镜(FE-SEM)对催化层的表面形貌进行表征。结果表明:用均质机处理过的催化层颗粒分布更加均匀,利用极化曲线、循环伏安法(CV)和交流阻抗谱(EIS)表征不同浆料制备膜电极的电化学性能。极化曲线、CV曲线和EIS谱均表明用均质机处理4 h的浆料对应的单电池性能最佳、欧姆电阻及电荷迁移电阻最低且Pt的利用率最大。Decal transfer is one of effective preparation methods for membrane electrode assemblies fabrication wel known for the low interfacial resistance and suitability for mass production. The complete decal transfer for membrane electrode was achieved on condition that ethylene glycol as the thickener and deionized water, isopropanol alcohol as the dispersion solvents were used in catalyst inks. Catalyst inks were dispersed by means of the ultrasonic cleaner, magnetic stirrer and ultra turrax. Also, influence of dispersion ways and extent on performance of proton exchange membrane fuel cells was investigated. The surface morphology of catalyst layers was observed through a field emission scanning electron microscope （FE-SEM）, and images show that distribution of particles is uniform if catalyst inks were processed by a ultra turrax. Moreover, the electrochemical performance of the membrane electrode using different inks was characterized by polarization curves, cyclic voltammetry （CV） and electrochemical impedance spectroscopy （EIS）. The polarization curves, CV curves and EIS show the single cell, for which catalyst ink was dispersed by a ultra turrax for 4 h, possesses the best cellperformance, the lowest ohmic resistance and charge transfer resistance, and the highest utilization of Pt.

关 键 词：质子交换膜燃料电池 膜电极 电化学性能 

分 类 号：TM911[电气工程—电力电子与电力传动]