Electrochemical seawater oxidation has been regarded as one of the most promising strategies for cost-efficient production of hydrogen from the standpoint of sustainability, but suffers from a competitive chlorine evolution/oxidation reaction. Herein, we report a facile hard templated route to fabricate CeO2 incorporated Ni–Co mixed metal phosphide embedded in a carbon matrix (CeO2–Co2−xNixP@C). Benefiting from compositional and structural features, the obtained CeO2–Co2−xNixP@C possesses remarkably improved OER performance in 1 M KOH (η = 295 mV at 10 mA cm−2) compared with Co2−xNixP@C. More importantly, the catalytic activity and stability is retained well after changing fresh water to seawater to constitute the working electrolyte. The promotion effect of CeO2 can be attributed to its unique capability in regulating the surface state of catalysts, contributing to efficient inhibition of chlorine competition.
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