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

A NiFe bimetallic metal organic framework (MOF) deposited on nickel foam and processed by low-pressure plasmas with 95%Ar+5%H2, pure Ar, and 95%Ar+5%O2 gases is used as an electrocatalyst for the oxygen evolution reaction. An alkaline solution (1 M KOH) with 95%Ar+5%H2 plasma processed NiFe-MOFs/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%H2 plasma treatment, the interfacial impedance greatly reduces, and the electrical double-layer capacitance slightly increased.