Proton exchange membrane water electrolysis(PEMWE)is a water electrolysis process with high current density,fast dynamic response and high hydrogen purity.To achieve its efficient industrial application,the development of inexpensive,efficient and stable oxygen evolution catalysts is particularly important.In this paper,a two-step synthesis method was used to dope the rare earth element yttrium(Y)into amorphous carbon supports to modify the surface of iridium dioxide(IrO2)particles.The prepared IrO2/YxC exhibited excellent catalytic activity for the acidic oxygen evolution reaction with a required overpotential of only 270mV at a current density of 10mA/cm2,which was lower than that of undoped IrO2/C(300mV)and commercial IrO2(310mV).The enhancement of the metal carrier interaction between the carbon carrier and its surface iridium dioxide particles by Y doping led to changes in the electron density around the Ir active site,thereby facilitating the regulation of the adsorption of reaction intermediates and optimizing the reaction rate.This research provided a new catalyst design approach for the oxygen evolution process in PEMWE,and was expected to promote the wider application of PEMWE technology in the field of clean energy.
proton exchange membrane water electrolysisoxygen evolution reactioniridium dioxide catalystrare earth element yttriummetal-carrier interaction
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