有序介孔碳载钯的制备、表征及对甲酸的电催化氧化性能

Abstract

[中文文摘]通过浸渍法和硫引入贵金属法分别制备了主要负载在介孔碳主孔道(MPC/Pd-1)和负载在介孔碳孔壁上小介孔中[MPC/(S)Pd-2]的两类负载型钯电催化剂,用XRD,SEM,TEM和电化学等方法表征了其结构和电催化性能.循环伏安结果表明,有序介孔碳载钯催化剂MPC/Pd-1和MPC/(S)Pd-2对甲酸氧化的催化活性分别是商用钯黑催化剂的4.0和2.4倍.MPC/Pd-1中的钯位于介孔碳的主孔道上,增加了催化剂/电解质/反应物三相界面的面积,使得其比MPC/(S)Pd-2的催化活性更高.[英文文摘]Ordered mesoporous carbon(MPC) supported palladium catalysts were prepared by impregnation(MPC/Pd-1) and the method of using sulfur to embed noble metal,respectively.The properties of the MPC/Pd were investigated by XRD,HRTEM,BET and electrochemical methods.Cyclic voltammetry and current-time curve show that MPC/Pd exhibits a very high catalytic activity for the oxidation of formic acid,which is 4.0(MPC/Pd-1) and 2.4 times that of commercial Pd black.Pd nanoparticles on MPC/Pd-1 are confined in the pores of...of MPC( 5—6 nm),which increases the reaction interfaces of the three-phase boundary( catalyst-electrolyte-reactive),whereas Pd nanoparticles on MPC /( S) Pd-2 are loaded inside the small mesoporous of the pore wall( 2—3 nm) ,which decreases utilization of the catalyst.