Low-pressure-plasma-processed NiFe-MOFs/nickel foam as an efficient electrocatalyst for oxygen evolution reaction

A NiFe bimetallic metal organic framework (MOP) deposited on nickel foam and processed by low-pressure plasmas with 95%Ar+5%H-2, pure Ar, and 95%Ar+5%O-2 gases is used as an electrocatalyst for the oxygen evolution reaction. An alkaline solution (1 M KOH) with 95% Ar+5%H-2 plasma processed NiFe-M0Fs/NF exhibits the best electrocatalytic performance with the lowest overpotential of 149 mV at a current density of 10 mA cm(-2) and a Tafel slope of 54 mV dec(-1). Furthermore, electrical impedance spectroscopy and cyclic voltammetry show that after 95%Ar+5%H-2 plasma treatment, the interfacial impedance greatly reduces, and the electrical double-layer capacitance slightly increased. (C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.