Summary: | The development of highly efficient and stable photoelectrode materials is of significant importance for the conversion of solar energy into chemical fuels. Herein, a novel Ni@NiO/BiVO<sub>4</sub> photoanode is designed and prepared for efficient water splitting by the deposition of Ni particles on the surface of BiVO<sub>4</sub> with subsequent thermal treatment. The integration of the Ni@NiO core–shell structure can efficiently passivate the surface states and accelerate the oxygen evolution kinetics along with the in situ-generated NiOOH, consequently contributing to the significantly improved charge separation efficiency. The resulting Ni@NiO/BiVO<sub>4</sub> photoelectrode enabled a photocurrent density of 2.6 mA/cm<sup>2</sup> with a surface charge separation efficiency of nearly 80% at the potential of 1.23 V<sub>RHE</sub>—much better than the unmodified BiVO<sub>4</sub> (1.8 mA/cm<sup>2</sup>, 64%).
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