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Herein, we report borophene decorated with Ag nanoparticles (Ag@B) as a support, which shows greatly enhanced oxygen-evolution-reaction (OER) performance for Co₃O₄ catalysts. The excellent OER performance of Co₃O₄-Ag@B is attributed into two main reasons. First, the conductive Ag-nanoparticles on borophene facilitate the growth of thin Co₃O₄ nanoplates based on an epitaxy model that greatly enhances the population of Co₃O₄ catalyst sites on the surface. In the meantime, Ag nanoparticles increase the electrical conductivity of the support, facilitating electrons-transfer from Co^Ⅲ atoms to form catalytically-active Co^Ⅳ sites. Second, the B atoms strongly interact with Co and O atoms on the Co₃O₄ nanoplates, greatly reducing the energy barrier of OER rate-determining procedure and increasing their stability on borophene supports. The Co₃O₄-Ag@B requires an overpotential of 270 mV and exhibits a …