石墨烯负载铂铅氧化物的制备及电催化性能研究

On the Synthesis and Electrocatalytic Activity of Graphene-supported Platinum and Lead Oxide

铂金属是燃料电池催化剂的主要活性位点,表面修饰和载体优化是提高铂基催化剂催化活性的常用方法。选用还原氧化石墨烯(RGO)作为载体,Pt-PbO2纳米复合材料作为ORR的催化活性位点,采用两步合成法制备比表面积大和高分散性的Pt-PbO2/RGO复合材料。XPS表征结果说明,Pt-PbO2/RGO复合材料中的铂金属电子结构因PbO2的加入发生了变化。电化学性能测试结果说明,Pt-PbO2/RGO复合材料(半坡电位为0.89V)作为一种ORR催化剂具有优异的催化活性。电化学稳定性测试结果证明,Pt-PbO2/RGO复合材料具有较为稳定的性质。

The platinum metal has remained to be an important major active sites of fuel cells at present.Surface modification and optimization of supporter are two kinds of methods frequently utilized to improve catalytic activity.Pt-PbO 2/RGO compounds with large surface and high dispersibility are produced by taking reduced graphene oxide as supporter and nanocompounds of Pt-PbO 2 as active sites in the way of two-steps method.XPS results reveal that electronic structure of platinum in Pt-PbO 2/RGO composite has taken changes due to the inclusion of lead oxide.Electrochemical activity tests show that Pt-PbO 2/RGO composite ( Half-wave potential of 0.89 V ) has higher electrocatalytic activity.Its stable performance is proved by electrochemical stability test.