Construction of CoP/Cu3P/Ni2P Double S-Scheme Heterojunctionsfor Improved Photocatalytic Hydrogen Evolution

The S-scheme heterojunctions exhibit great poten-tial for photocatalytic hydrogen evolution, which helps not onlymaintain a stronger redox capability for photocatalysts but alsoachieve the efficient separation and transfer of photo-inducedcharge carriers. Herein, metal-organic frameworks (MOF)-derivedCoP/Cu3P/Ni2P (CCNP) double S-scheme photocatalytic sys-tems were constructed by simple hydrothermal and phosphating.The optimized CCNP photocatalyst revealed the maximumphotocatalytic hydrogen evolution activity of 786.58 mu mol withan apparent quantum efficiency of 3.69%, which is roughly 2.64and 3.33 times higher than that of CoP (CP) and CoP/Ni2P(CNP), respectively. The improved hydrogen production perform-ance is attributed to the formation of S-scheme heterojunctionsthat facilitate the accelerated electron-hole transfer while maintaining the strong redox ability of the catalysts, and to the fact thatthe MOF-derived composite catalysts still maintain the dodecahedral shape that facilitates the attachment of Cu3P and Ni2P, whiletheir tight bonding facilitates the charge transfer. This work helped design a novel double S-scheme CoP/Cu3P/Ni2P heterojunctionderived from MOF for efficient artificial solar energy conversion.

Automated summary

This study constructed metal-organic frameworks-derived double S-scheme photocatalytic systems through a simple method, achieving efficient photocatalytic hydrogen evolution. The optimized photocatalyst exhibited high photocatalytic activity, and the formation of S-scheme heterojunctions facilitated the accelerated electron-hole transfer while maintaining the strong redox capability of the catalysts.