质子交换膜燃料电池Pt/C催化剂材料制备研究

Preparation of Pt/C Catalyst Material for Proton Exchange Membrane Fuel Cell

质子交换膜燃料电池主要成本集中在贵金属Pt催化剂,而Pt/C催化剂是目前质子交换膜燃料电池的关键材料之一。为此,对机械化学法、乙醇机械化学法、乙醇浸渍搅拌法等工艺方法制备Pt/C催化剂进行研究,并对退火、铂金属用量等条件进行探索。结果表明:高温退火会降低Pt/C催化剂的催化性能,故退火温度要适当,不能超过900℃;3种方法制备Pt/C电催化性能进行对比,乙醇机械法和乙醇浸渍搅拌法性能相当,机械化学法优于前两者,并对其进行平行试验验证,重复性较好,测试性能稳定,具有可操作性;对其机械化学法Pt负载量(20%~40%)电催化性能对比发现,Pt负载量增加,电催化性能增加;对比扩大球磨和玛瑙研磨发现,扩大球磨的电催化性能好,说明该方法可实现扩大实施,对质子交换膜燃料电池工业化应用具有重要的指导意义。

The main cost of PEMFC is concentrated on Pt catalyst,which is one of the key materials of PEMFC.Therefore,the preparation of Pt/C catalysts by mechanochemical method,Ethanol-mechanochemical method,Ethanol-impregnation stirring method were studied,and the conditions of annealing and platinum metal consumption were explored.The results showed that the high temperature annealing would reduce the catalytic performance of Pt/C catalyst.The annealing temperature shall be appropriate and shall not exceed 900℃.Compared with the preparation of Pt/C by mechanochemistry,ethanol mechanochemistry and ethanol impregnation stirring method,the performance of ethanol mechanical method and ethanol impregnation stirring method is slightly equivalent,and the mechanochemistry method is better.It has been verified by parallel tests,with good repeatability,stable test performance and operability.Compared with the electro-catalytic performance of its mechanochemical Pt loading(20%~40%),it was found that the electro-catalytic performance increased with the increase of Pt loading.The comparison between expanded ball milling and agate milling shows that the expanded ball milling has good electrocatalytic performance,which indicates that this method can be expanded and has important guiding significance for the industrial application of proton exchange membrane fuel cells.