Construction dual-regulated NiCo₂S₄ @Mo-doped CoFe-LDH for oxygen evolution reaction at large current density

Developing efficient and nonprecious large-current-density based oxygen evolution reaction (OER) electrocatalysts is strongly required for sustainable industrial water splitting. Hence, a unique heterostructure erecting by Mo-doped CoFe layered double hydroxides coating NiCo₂S₄ nanotube arrays grown on nickel foam (NCS@CFM-LDH/NF) is elaborately demonstrated. It only needs an overpotential of 295/332 mV to achieve current density of 500/1000 mA cm⁻², respectively, with a low Tafel slope of 83.0 mV dec⁻¹ in alkaline media. NCS@CFM-LDH/NF also shows an ultra-long-term stability at 1000 mA cm⁻² over 100 h. Its remarkable performance is ascribed to the synergic effect of multi-component and hierarchical structure. Additionally, Theoretical calculations disclose that the doping of molybdenum is beneficial to the adsorption of the *O intermediate, thus promotes OER activity. This study provides an attractive approach to design highly active and durable OER catalysts for industrial application in electrolysis of water.