Abstract
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•Amorphous copper phosphide OER catalyst is synthesized by one-step electrodeposition.•A smooth morphology with surface void is obtained after annealing.•An overpotential of 310 mV at 10 mA/cm2 with a Tafel slope of 88 mV/dec is demonstrated.•Excellent long-term electrochemical durability is observed.
A copper phosphide (Cu3P) thin film is synthesized on a Ni foam using a one-step electrodeposition method at room temperature and annealed at 300 °C in Ar atmosphere. The Cu3P film is amorphous and has a flat morphology with surface voids. It works as an electrocatalyst for water oxidation in an alkaline 1 M KOH electrolyte. It exhibits excellent catalytic oxygen evolution reaction with an overpotential of 310 mV, Tafel slope of 88 mV/dec, and good stability over 20 h of operation at 10 mA/cm2. The excellent OER performance is due to its large electrochemically active surface area and low charge transfer resistance at the catalyst-electrolyte interface after the annealing.