Abstract
Carbon nitride has been considered as one of the most promising materials to catalyze O2 evolution from water; however, its intrinsic drawbacks of surficial inertness and poor charge separation efficiency are serious. In contrast to the ordinary modification method of cocatalyst loading, we describe here that a simple modification method of molecule loading can greatly improve the activity of carbon nitride for O2 evolution. A mechanistic investigation by time-resolved transient absorption spectroscopy reveals that the BODIPY molecule can extract photogenerated holes in carbon nitride to promote the oxidation of water. It is the first case of a dye molecule acting as a hole relay to promote photocatalytic water oxidation. These results provide a new approach to the modification for the better catalytic performance of carbon nitride on O2 evolution.
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