Electrochemical Deposited Amorphous Bimetallic Nickle-Iron (Oxy)Hydroxides Electrocatalysts for Highly Efficient Oxygen Evolution Reaction

Abstract

The low-cost, and high-performance electrocatalysts, especiailly metal (oxy)hydroxides, for the oxygen evolution reaction (OER) have attracted considerable attention because of their promising OER activity. Amorphous elctrocatalysts are often superior to their crystalline conunterparts due to their more actives and structural flixibity. However, it remains a great challenge to prepare by conventional methods. Hererin, the amorphous NiFe (oxy)hydroxides on nickel foam (NF) with large surface area, and small charge transfer resistance were fabricated by electrodeposition technique. The as-fabricated NiFe (oxy)hydroxides (Ni:Fe=1:3) exhibited remarkable electrocatalytic activity and stability for OER with a low overpotential of 245 mV at a current density of 100 mA cm -2 , a small Tafel slope of 76.9 mV dec -1 , which was superior to that of noble metal electrocatalysts (RuO 2 ) and most NiFe-based electrocatalysts. This work provides a facile and effective way to synthesis metal (oxy)hydroxides catalysts toward high-efficiency water splitting.

Keywords: Electrocatalyst, Oxygen evolution reaction, NiFe (oxy)hydroxides