We prepared porous nickel-iron alloy electrodes for alkaline water electrolysis oxygen evolution reaction(OER)by electrodeposition on a commercial nickel mesh.By regulating the quality of electro-deposition and the concentration of metal ions in the plating solution to change the deposition layer mor-phology,catalytic performance,and stability of the electrode catalyst,a multi-stage porous dendritic mor-phology plating was prepared.At a current density of 10 mA·cm-2,the electrode OER overpotential was only 250 mV,and the Tafel slope was only 35.8 mV·dec-1.The catalytic activity exceeded that of the commercial Ir catalyst,and the Cdl value reached 14.43 mF·cm-2,which was 10 times that of the blank Ni mesh,providing excellent OER catalytic activity with a large electrochemical active area.Meanwhile,the porous morphology constructed by electrodeposition reduced the reaction resistance,and the Rct value of the NiFe alloy electrode(0.32 Ω)was much smaller than that of the Ir/Ni electrode(1.51 Ω),which possessed faster catalytic reaction kinetics.Under the conditions of 80 ℃,30％KOH and 500 mA·cm-2 current density,the stable operation of water electrolysis for 75 h did not show any signifi-cant degradation,which demonstrated good stability.
alkaline water electrolysisnickel-iron alloyelectrode materialsoxygen evolution reaction
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