TiO_2纳米纺锤体负载Pt在氧还原反应中的应用（英文）

Synthesis of TiO_2 Nanospindles Supported Pt Nanodots for Oxygen Reduction Reaction

燃料电池中催化剂的稳定性是影响其实际应用的关键问题之一。本研究合成了锐钛矿型纺锤状TiO_2纳米材料,并负载纳米Pt制备了TiO_2-Pt双组分复合催化材料。将其制作成电极材料后,进行了TEM、XRD、拉曼光谱、电化学特性分析。结果表明:TiO_2-Pt材料中Pt纳米颗粒的TEM形貌与TiO_2的表面亲和力有关;该双组分催化剂呈现出两个单独的氧还原反应(ORR)峰;在负载Pt后,材料电荷传输电阻明显减小,使得TiO_2-Pt中TiO_2纺锤体组分上的ORR性能明显增强;紫外光可同时促进TiO_2-Pt中两组分的ORR性能;TiO_2-Pt比炭黑负载Pt具有更好的稳定性。

The long-term stability of the catalysts for fuel cell reactions is one of the obstacles that limit their practical application.Herein,anatase TiO2 nanospindles were synthesized as a support for the growth of Pt nanodots to obtain a TiO2-Pt catalyst for oxygen reduction reaction(ORR).TEM,XRD,Raman spectrum,and electrochemical testing were employed to characterize the properties of TiO2-Pt catalyst.Results showed as following:the morphology of Pt nanodots on TiO2-Pt catalyst was dependent on the surface affinity of TiO2 nanospindles;there were two individual ORR peaks of the dual-component catalyst;after Pt deposition,the ORR performance of the catalyst was enhanced,which was ascribed to the accelerated surface charge transport through the Pt nanodots;the oxygen reduction performance on both components of TiO2-Pt catalyst were promoted by ultraviolet light illumination;the long-term stability of TiO2-Pt nanospindle was better than that of commercial carbon black supported Pt catalyst.