Highly efficient and durable water oxidation in a near-neutral carbonate electrolyte electrocatalyzed by a core–shell structured NiO@Ni–Ci nanosheet array

Core–shell structured NiO@Ni–Ci/CC exhibits superior water oxidation activity, requiring 387 mV overpotential to drive 15 mA cm −2 in 1.0 M K–Ci.