摘要
Photoelectrochemical (PEC) water splitting has emerged as an effective and sustainable strategy for hydrogen production. In this study, a cutting-edge strategy to fabricate dual direct Z-scheme MOF/NIS/FLP junctions was developed to serve as the photocathode for the enhanced H
production from water splitting. Solvothermal synthesis of MOF/NIS induces sulfur vacancies to elevate the electron density on NIS. The subsequent integration of MOF/NIS with FLP by dip-coating as a charge extraction layer further enhances the light-harvesting capabilities of MOF/NIS/FLP. Notably, FLP not only extends the charge carrier lifetime but also controls the concentration of sulfur vacancy and, thereby, prevents their agglomeration. Furthermore, X-ray photoelectron spectroscopy and electron paramagnetic resonance analyses provide experimental validation on the underlying possible reaction mechanism, while PEC measurement further confirms an 18 % enhancement in the light-harvesting efficiency of MOF/NIS/FLP. The synergistic interaction between MOF/NIS and FLP facilitates the formation of a dual direct Z-scheme, significantly improving charge-carrier separation and transfer. By leveraging a dual direct Z-scheme approach, the MOF/NIS/FLP system yields a pronounced H
evolution rate of 7.3 mmol g
h
, outperforming MOF/NIS by a factor of 4.8. These findings emphasize the effectiveness of engineered ternary MOF/NIS/FLP photocathodes for next-generation green hydrogen production.