Mn–Ce modified NiP electrocatalysts for HER: A combined computational and electrochemical study

Abstract

The task of developing inexpensive, more efficient, and stable catalysts for hydrogen evolution reaction in water splitting is increasingly challenging. In this study, we developed Mn–O–Ce embedded NiP coating using electroless plating, which proved to be a competent electrocatalyst for hydrogen evolution reaction (HER). To synthesize Mn–O–Ce composite, we utilized a thermal decomposition method. The physicochemical characterization of Mn–O–Ce/NiP coating envisaged an improved surface area. Moreover, the catalyst, which was provided by CeO₂ and MnO₂ particles in the NiP matrix, increased the surface roughness, thereby enhancing the number of surface-active sites. Electrochemical characterization showed that Mn–O–Ce/NiP coating exhibited outstanding catalytic performance with a small overpotential of 120 mV and a small Tafel slope of 123 mV dec⁻¹ at a current density of 10 mA cm⁻². We also explored its catalytic performance for the hydrogen evolution reaction (HER) by computing the free energy change associated with hydrogen evolution. Furthermore, the coating demonstrated excellent electrochemical stability in alkaline solution. This study provides a feasible option for developing a composite incorporated electrode with desirable electrochemical properties for the extensive production of hydrogen.