【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.更多还原

【Abstract】 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.更多还原