Study Of The Promotion Effect Of Iron Phosphide On Performanceof Palladium And Platinum Based Catallysts For Direct Liquid Fuel Cell

In recent years, due to the high energy density, simple device, portable fuel, and environmentally friendly, direct formic acid fuel cell and direct methanol fuel cells using small acids molecules alcohol molecules as fuel have attracted significant attention.However, the carbon supported platinum/palladium anodic catalyst used in DLFC possesses low catalytic activity for alcohol electrooxidation, high cost of noble metal,poisoned with intermediate CO, dissolution and aggregation of noble metal,electrochemical corrosion of carbon support. Thus, the development of anodic catalysts with high electrocatalytic activity, good stability and low cost is an important subject in the development of PEFMC.This thesis mainly studies the support of anodic catalysts, puts emphasis on the study of enhancing metal-support interaction. In order to improve the electrocatalytic activity and stability of catalysts for the oxidation of formic acid and alcohol, and enhance the utilization of noble metal, this work has prepared Pd-Fe2P/C catalyst for direct formic acid fuel cell(DFAFC), and Pt-Fe2P/C catalyst for direct methanol fuel cell(DEFC).This work supplies a novel Fe2P/C composite support, then Pd and Pt nanoparticles are deposited on Fe2P/C by microwave-assisted polyol reduction method to obtain Pd-Fe2P/C and Pt-Fe2P/C catalyst. Electrochemical tests shows that this catalyst has excellent catalytic performance for the electrooxidation of formic acid and methanol. It mainly result from the addition of Fe2 P, not only can it enhance the metal-support interaction between support and Pt nanoparticles, but also it is an effective co-catalyst.The electrooxidation results show that when the iron phosphide of catalysts is 20%.Therefore, this work supplies a novel and ideal support of high performance Pd and Pt based catalyst for DFAFC and DMFC.