Facile and cost-effective nickel-anchored nanofibril V2O5 electrocatalyst for efficient oxygen evolution reaction

Abstract

Creating affordable and efficient catalyst for water splitting is essential for sustainable hydrogen production. This study presents a nickel-doped vanadium pentoxide (Ni–V₂O₅) electrocatalyst synthesized via a hydrothermal method, demonstrating enhanced oxygen evolution reaction (OER) activity. Comprehensive characterization reveals that Ni incorporation into V₂O₅ enhances conductivity and increases active sites, contributing to improved catalytic performance. Electrochemical analyses, such as linear sweep voltammetry (LSV), Tafel slope measurements, and electrochemical impedance spectroscopy (EIS), demonstrate the superior performance of Ni–V₂O₅ compared to undoped V₂O₅. The Ni–V₂O₅ electrocatalyst achieves a low overpotential of 309 mV at +20 mA cm⁻² and a Tafel slope of 24 mV dec⁻¹, underscoring its promise as a robust electrocatalyst for practical water splitting applications.