Electrooxidation of Formic Acid on Palladium Nanoparticles Supported on Ordered Mesoporous Carbon

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 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.