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As a promising candidate for photoelectrochemical water decomposition, α-Fe 2 O 3 has been plagued by low actual quantum efficiency and weak stability. In this work, we prepared an α-Fe 2 O 3 photoanode with Mg doping and cobalt-hydroxylphosphate (CoPi) coating. Compared to α-Fe 2 O 3 , the CoPi/Mg−Fe 2 O 3 photoanode exhibited remarkably enhanced activity of photoelectrochemical water splitting. The photocurrent density of the CoPi/Mg−Fe 2 O 3 photoanode was 1.30 mA cm −2 at 1.23 V vs RHE, which was around 3.51 times higher than that of α-Fe 2 O 3 (0.39 mA cm −2 ). In addition, the CoPi/Mg−Fe 2 O 3 photoanode demonstrated good stability, and the photocurrent density produced by the CoPi/Mg−Fe 2 O 3 photoanode did not decrease significantly after 24 h of light irradiation. The efficiencies of bulk charge separation and surface charge injection of the CoPi/Mg− Fe 2 O 3 photoanode were greatly increased through Mg doping and CoPi coating, which significantly improved its performances of photochemical water splitting.

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