Abstract
Hematite (α-Fe2O3) has been intensively studied as a promising photoanonde material for water splitting. This paper reports a facile method to prepare dendritic hematite nanorods and an active catalytic interface was constructed by coordinating ferrous lactate layers. A negative shift of 100 mV for onset potential and significant enhancement (200%) of photocurrent were observed for the modified hematite photoanodes. It was found that ferrous lactate decorated samples showed distinct catalytic effect for water oxidation only in illuminated condition. XPS and a series photo-electrochemical analysis reveal that Fe (II) site in the surface bonded ferrous lactate possessed distinguished photo-generated charge transfer properties and excellent stability during the reaction. The corresponding mechanism for water oxidation over catalytic surface was proposed. The result provides a facile and reliable surface modification method for efficient PEC water oxidation.
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