Preparation of Palladium-Iridium Catalyst and Its Application in Proton Exchange Membrane Hydrogen Production Membrane Electrode
Proton exchange membrane water electrolysis is one of the main technical routes for the production of green hydrogen,and it is also a research hotspot in the water electrolysis industry.The membrane electrode is the core component of the proton exchange membrane water electrolysis hydrogen production technology,and its core development work is mainly to reduce the iridium load on the membrane electrode by manipulating the internal structure of the anode iridium-based catalyst,adding new active sites and enhancing its stability.In this paper,a new type of oxygen evolution catalyst is proposed:palladium is introduced into the traditional iridium-based catalyst,a palladium-iridium alloy catalyst is developed,palladium is used as a new active point,and the alloying effect of palladium metal and iridium metal is fully used to stimulate the hidden activity of the iridium-based catalyst,and its oxygen evolution overpotential is only 344 mV,and the Tafel slope value is 75.71 mV/dec,which is much higher than that of the traditional iridium-based catalyst.When the iridium load is 0.33 mg/cm2,the voltage of the electrolyzed water is only 1.867 V at the working current density of 1000 mA/cm2,and the operation has been stable for 350 h.
water electrolysiscatalystmetal loadingsmembrane electrode
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维普
