Effects of synthesis and structural regulation of Ir and IrPd catalysts on methanol oxidation performance
Using triblock copolymer P123(poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide),PEO20-PPO70-PEO20)as reducing agent and protective agent,the effects of hydrothermal and solvothermal methods on the synthesis of pure Ir and IrPd alloy catalysts and their electrocatalytic oxidation of methanol(MOR)were compared.For pure Ir catalyst,solvothermal method can better promote the reduction of Ir precursor under the same condi-tions.For IrPd alloy catalysts,core-shell structure products(IrPd-S)with rich Ir-surface but low MOR activity can be prepared by solvothermal method.The different atomic ratios(IrPd,Ir2Pd,IrPd2)obtained by hydrothermal reac-tion have smaller particle sizes and more uniform distribution of elements.Among them,IrPd catalyst with ratio of 1∶1(IrPd-H)had the highest MOR electrocatalytic activity.These results show that the structure,surface composi-tion and electrocatalytic activity of pure Ir and IrPd alloy catalysts can be effectively adjusted by adjusting the type of solvent and the structural induction of P123.
structural regulationhydrothermal synthesisIrPd alloytriblock copolymeroxidation of methanol
万方数据
维普
