The development of renewable energy sources has recently drawn an increasing amount ofattention as a means of addressing the global problems of environmental pollution and rising energyconsumption[1]. Among the many options, hydrogen energy shows itself to be a strong contenderas a clean and carbon-neutral energy source. Widely accepted as the best approaches to thehydrogen evolution reaction (HER), where electrical energy is used to directly split water, are electrochemical and photoelectrochemical water splitting[2]. The
oxygen evolution reaction (OER), which involves a sequential proton-coupled electron transfer step and is more complex thanthe straightforward two-electron transfer process for HER, has relatively low kinetic rates and continues to be a significant barrier to the advancement of water splitting applications[3]. It isurgently necessary to create highly active electrocatalysts in order to reduce overpotentials andspeed up reaction rates[4].In this study, three metallic
CoNiCu are successfully synthesized via the thermal annealing by doping Cu to
MOF based NiCo as reported by Lin et al [5].All electrochemical performances were evaluated by using an electrochemistry workstation (VSP-300) on a standard three-electrode system in 1.0 M KOH electrolyte with glassy carbon electrode (GCE, 3 mm) coated with catalyst as the working electrode, a platin electrode as the counter electrode, and Ag/AgCl electrode and the reference electrode. To form homogeneous ink, 2 mg of catalyst was dissolved in a mixed solution containing water-ethanol (4:1, v/v) and Nafion solution (40 L, 5 wt%) and sonicated for 30 minutes. The working electrode was then created by dropping5 μL of ink onto the GCE (0.136 mg cm2). Linear sweep voltammetry (LSV) measurements were conducted at 5 mV s-1.The catalysts exhibits 96 mV overpotential (η) at a current density of 10 mA cm−2 , for OER. Theobtained catalyst shows an onset potential of 1.55 V vs. RHE and 280 mA cm−2 current density at 1.9V vs RHE in the presence of 1 M KOH. The observed results of OER catalytic behavior are better than noble benchmark Pt/C catalyst under identical conditions. The results suggested that the
MOF plays a major role in enhancing the catalytic activity, stability and electronic properties due to their porous and interconnected structure.