Three Dimensional NiS-MoOx/CC Nanosheet Array for Efficient Electrocatalytic Oxygen Evolution Reaction

Developing highly efficient oxygen evolution reaction (OER) electrocatalysts remains critical for advancing large-scale water splitting. Self-supported electrodes, where catalysts are directly grown on conductive substrates, offer a promising strategy to enhance OER performance by improving structural stability and charge transfer. Herein, we fabricate a self-supported electrode via in situ growth of a MoS ₂ precursor on carbon cloth (CC) using a facile hydrothermal method, followed by Ni incorporation to optimize catalytic activity. The optimized NiS-MoO _x /CC-0.6 electrode exhibits outstanding OER performance with a low overpotential of 340 mV at a current density of 50 mA cm ^− 2 in alkaline media. This enhanced activity is attributed to the three-dimensional (3D) nanosheet array architecture, which exposes abundant active sites, facilitates electrolyte penetration, and ensures efficient electron transport. Our work provides insights into designing high-performance transition metal-based electrocatalysts for sustainable energy applications.