Interfacial composite FeOOH enhanced efficient electrocatalytic oxygen evolution of NiSe2/Ni2O3

Electronic structure regulation is one of the essential strategies for developing advanced electrocatalysts . Herein, FeOOH was electrodeposited on the surface of NiSe 2 /Ni 2 O 3 , resulting in a layered NiSe 2 /Ni 2 O 3 /FeOOH interfacial composite with a unique hierarchical structure and strong electronic interactions. This sheet-like nanostructure provides sufficient space for mass transfer, fully exposes the active sites, and accelerates the reaction kinetics. The optimal sample exhibits excellent oxygen evolution reaction (OER) activity with a low overpotential of 270 mV at a current density of 100 mA cm −2 and a Tafel slope of only 54.7 mV dec −1 . It also has excellent durability. This study provides a new perspective for developing efficient electrocatalysts by constructing interfacial composites.