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Engineering MoOx/MXene Hole Transfer Layers for Unexpected Boosting Photoelectrochemical Water Oxidation.

The development of semiconductor photoanodes is of great practical interest for the realization of photoelectrochemical (PEC) water splitting. Herein, zero-dimensional (0D) MXene quantum dots (MQD) or two-dimensional (2D) MXene nanosheets (MN) were grafted on BiVO4 substrate, then as-assemblied MoOx layer by combining ultrathin oxyhydroxide oxygen evolution cocatalyst (OEC) was constructed as a promising model system of integrated photoanodes. As-prepared OEC/MoOx/MQD/BiVO4 array not only achieves a current density of 5.85 mA cm-2 at 1.23 V versus reversible hydrogen electrode (vs. RHE), but also remarkably enhances photostability. From electrochemical analysis and density functional theory calculations, high PEC performance is ascribed to the incorporation of MoOx/MQD as hole transfer layers, retarding charge recombination, promoting hole transfer and accelerating water splitting kinetics. This proof-of-principle work not only demonstrates the potential utilization of hole transfer layers, but also sheds light on rational design and fabrication of integrated photoanodes for feasible solar energy conversion.