Abstract
Photoelectrochemical (PEC) water splitting based on silicon (Si) is very promising because of its broad visible light absorption, earth abundance, and high carrier mobility. However, the commercial application is hindered by the poor stability and sluggish oxygen evolution reaction (OER) dynamics in electrolytes. Thanks to the non-noble bimetallic NiMoO4 nanosheet and atomic layer deposited TiO2 ultrathin film, we report a highly efficient and stable photoanode made of three-dimensional NiMoO4 nanosheet/TiO2 film/Si nanowire arrays. The NiMoO4/TiO2/Si composite PEC cell delivered a photocurrent density as high as 8.7mA/cm2 under 1 Sun illumination, which is 27 times higher than that of pristine TiO2 coated Si nanowires. Its onset potential was shifted toward the negative potential of 90mV. The improved performance resulted from the synergistic effects of the favourable light trapping ability and the superior interface charge transfer related to the robust OER activity of NiMoO4 nanosheets.
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