Facilitating interface charge transfer via constructing NiO/NiCo2O4 heterostructure for oxygen evolution reaction under alkaline conditions

Designing high-activity electrocatalysts to enhance the slow multielectron-transfer process of the oxygen evolution reaction (OER) is of great importance for hydrogen generation. Here, we employ hydrothermal and subsequent heat-treatment strategies to acquire nanoarrays-structured NiO/NiCo 2 O 4 heterojunction anchored Ni foam (NiO/NiCo 2 O 4 /NF) as efficient materials for catalyzing the OER in an alkaline electrolyte. Density functional theory (DFT) results demonstrate that NiO/NiCo 2 O 4 /NF exhibits a smaller overpotential than those of single NiO/NF and NiCo 2 O 4 /NF owing to interface-triggered numerous interface charge transfer. Moreover, the superior metallic characteristics of NiO/NiCo 2 O 4 /NF further enhance its electrochemical activity toward OER. Specifically, NiO/NiCo 2 O 4 /NF delivered a current density of 50 mA cm −2 at an overpotential of 336 mV with a Tafel slope of 93.2 mV dec −1 for the OER, which are comparable with those of commercial RuO 2 (310 mV and 68.8 mV dec −1 ). Further, an overall water splitting system is preliminarily constructed via using a Pt net as cathode and NiO/NiCo 2 O 4 /NF as anode. The water electrolysis cell performs an operating voltage of 1.670 V at 20 mA cm −2 , which outperform the Pt net||IrO 2 couple assembled two-electrode electrolyzer (1.725 V at 20 mA cm −2 ). This study proposes an efficient route to acquire multicomponent catalysts with rich interfaces for water electrolysis.