MoS₂ Nanosheets Uniformly Anchored on NiMoO₄ Nanorods, a Highly Active Hierarchical Nanostructure Catalyst for Oxygen Evolution Reaction and Pseudo‐Capacitors

Abstract Hierarchical nanostructures have attracted considerable research attention due to their applications in the catalysis field. Herein, we design a versatile hierarchical nanostructure composed of NiMoO₄ nanorods surrounded by active MoS₂ nanosheets on an interconnected nickel foam substrate. The as‐prepared nanostructure exhibits excellent oxygen evolution reaction performance, producing a current density of 10 mA cm⁻² at an overpotential of 90 mV, in comparison with 220 mV necessary to reach a similar current density for NiMoO₄. This behavior originates from the structural/morphological properties of the MoS₂ nanosheets, which present numerous surface‐active sites and allow good contact with the electrolyte. Besides, the structures can effectively store charges, due to their unique branched network providing accessible active surface area, which facilitates intermediates adsorptions. Particularly, NiMoO₄/MoS₂ shows a charge capacity of 358 mAhg⁻¹ at a current of 0.5 A g⁻¹ (230 mAhg⁻¹ for NiMoO₄), thus suggesting promising applications for charge‐storing devices.