Abstract
? 2022 Elsevier B.V.Exploration of efficient, inexpensive, and stable electrocatalysts for oxygen evolution reaction (OER) is of great signi?cance for energy conversion and storage. Currently, transition metal oxides (TMOs) show huge potential as electrode materials for OER due to their low-cost, rich redox chemistry and high chemical stability. In this work, we report a facile route for uniformly coating CeO2 nanoparticles (NPs) on the surface of nickel cobalt Prussian blue analogue (NiCo-PBA) derived Co3O4/NiO hollow porous nanocubes (Co3O4/NiO HPN). The accurate control of CeO2 content on the Co3O4/ NiO HPN (Co3O4/NiO@CeO2 HPN) surface can effectively alter the surface electronic states, which tunes the ratio of Co2+/Co3+ and Ni2+/Ni3+ for creating abundant oxygen vacancies. The large surface area of hollow nanocubes derived from NiCo-PBA with porous structure offers more active sites, resulting in the great promotion of OER activity. The prepared Co3O4/NiO@CeO2-2 HPN heterostructure exhibits remarkable OER performance with a low overpotential (290 mV at 10 mA·cm?2), small Tafel slope (66 mV dec?1) and excellent durability. The present method opens a new avenue to the preparation of low-cost and efficient electrocatalysts in OER.
NSTL
Elsevier