石墨化碳载体对Pt/C质子交换膜燃料电池催化剂稳定性的影响  

Effect of Graphitic Carbon on Stability of Pt/C Catalysts for Proton Exchange Membrane Fuel Cells

作　　者：罗璇[1] 侯中军 明平文 邵志刚[1] 衣宝廉[1] 

机构地区：[1]中国科学院大连化学物理研究所 [2]新源动力股份有限公司,辽宁大连l16025

出　　处：《催化学报》2008年第4期330-334,共5页

基　　金：国家自然科学基金(20636060);国家高技术研究发展计划(863计划,2006AA11A132)

摘　　要：研究了碳载体Vulcan XC-72石墨化处理对Pt基催化剂稳定性的影响.在不同温度下对碳材料Vulcan XC-72进行了石墨化处理,并以处理后的材料为载体通过浸渍还原法制备了20%Pt/C催化剂.采用X射线衍射、氮气物理吸附/脱附等测试手段对碳载体材料进行表征,并用电化学实验和热重分析法考察了催化剂的稳定性.结果表明,碳材料在1 500℃左右开始石墨化,温度越高,石墨化程度越高,但比表面积逐渐减小;以石墨化的碳材料为载体的催化剂的稳定性明显优于普通Pt/C催化剂.The effect of graphitic carbon on the stability of Pt/C catalysts for proton exchange membrane fuel cells was investigated. Vulcan XC-72 carbon black was graphitized at different temperatures, and the catalyst having a platinum loading of 20 % was prepared by HCHO reduction-impregnation using the graphitic carbon as the support. Graphitic carbons were characterized by X-ray diffraction and nitrogen adsorption-desorption methods. The catalysts were characterized by an accelerated aging test and TG analyses. The results showed that the graphitization process started at 1 500 ℃ , and the degree of graphitization increased with temperature, but the specific surface area of the carbons decreased gradually. The catalysts using the graphitic carbons as the support showed better electrochemical stability.

关 键 词：铂 碳 石墨化 活性比表面积 稳定性 质子交换膜燃料电池 

分 类 号：TM911.4[电气工程—电力电子与电力传动]