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Due to its direct band gap of ~1.35 eV, appropriate energy band-edge positions, and low surface-recombination velocity,  p -type InP has attracted considerable attention as a promising photocathode material for solar hydrogen generation. However, challenges remain with  p -type InP for achieving high and stable photoelectrochemical (PEC) performances. Here, we demonstrate that surface modifications of InP photocathodes with Ti thin layers and amorphous MoS  x   nanoparticles can remarkably improve their PEC performances. A high photocurrent density with an improved PEC onset potential is obtained. Electrochemical impedance analyses reveal that the largely improved PEC performance of MoS  x  /Ti/InP is attributed to the reduced charge-transfer resistance and the increased band bending at the MoS  x  /Ti/InP/electrolyte interface. In addition, the MoS  x  /Ti/InP photocathodes function stably for PEC water reduction under continuous light illumination over 2 h. Our study demonstrates an effective approach to develop high-PEC-performance InP photocathodes towards stable solar hydrogen production.

Engineering MoSx/Ti/InP Hybrid Photocathode for Improved Solar Hydrogen Production