Construction of novel P-Si/TiO2/HfO2/MoS2/Pt heterophotocathode for enhanced photoelectrochemical water splitting

Photoelectrochemical devices have been developed to enable the conversion of solar energy. However, their commercial potential is restricted by the limited stability of the materials employed. To enhance the stability of photocathode and its solar water splitting performance, a P-Si/TiO2/HfO2/MoS2/Pt composite photocathode is developed in this work. The novel TiO2/HfO2/MoS2 serial nanostructure provides excellent stability of the photocathode, and optimizes the interface energy barrier to further facilitate the transfer process of photogenerated carriers within the photocathode. The bestP-Si/TiO2/HfO2/MoS2/Pt photocathode demonstrates an initial potential of 0.5 V (vs. RHE) and a photocurrent density of -29 mA/cm(2) at 0 V (vs. RHE). Through intensity modulated photocurrent spectroscopy and photoluminescence test, it is known that the enhanced water splitting performance is attributed to the optimized carrier transfer property. These findings provide a feasible strategy for the stability and photon quantum efficiency enhancement of silicon-based photocathode devices.

Automated summary

This study develops a novel composite photocathode for enhancing the stability and solar water splitting performance of photoelectrochemical devices. The optimized interface energy barrier and carrier transfer properties contribute to the enhanced water splitting performance. These findings provide a feasible strategy for improving the stability and photon quantum efficiency of silicon-based photocathode devices.