The electrocatalytic oxygen evolution reaction (OER) plays a critical role in sustainable energy conversion and storage, but OER is severely hampered owing to the lack of highly efficient catalysts. Here, we report an efficient electrocatalyst, with NiO/Co 3 O 4 nanoparticles decorated on nitrogen-doped carbon (NiO/Co 3 O 4 @ NC). Abundant high-valence Ni 3+ and Co 3+ species were observed on the surface of the hybrid due to the strong NC−metal oxide and NiO−Co 3 O 4 interactions. This unique structure leads to excellent OER performance, delivering a very low overpotential of 240 mV@10 mA•cm −2 on glassy carbon and 200 mV@10 mA•cm −2 on Ni foam in KOH and having a turnover frequency (@350 mV overpotential) 6 and 16 times higher than that of IrO 2 and RuO 2 , respectively.

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