窄带隙铜锌锡硫（CZTS）半导体具有成本低、无毒和吸光率高等特点，是极具潜力的光电解水制氢材料。然而，光生电荷分离效率低和光腐蚀导致它尚未实现长期高效的光电解水制氢应用。针对该问题，本项目设计以SnS2、g-C3N4和Pt为CZTS的表面修饰材料，构建Ⅱ型-直接Z型异质结构光电极来提高CZTS的光电化学性能及稳定性。通过表面修饰方法，依次在CZTS表面沉积SnS2、g-C3N4和Pt，并研究表面修饰和反应条件对物相、形貌、载流子流向等的调控作用，实现Pt/g-C3N4/SnS2/CZTS异质结构光电极可控制备。借助原位红外光谱等技术，分析光生载流子传输的微观过程，结合物理结构及光电化学性能表征，揭示光电极结构对光生载流子传输的调控机制。基于此，结合光腐蚀分析，评价Pt/g-C3N4/SnS2/CZTS光电极的寿命及光电化学活性，为获得长寿命、高活性硫化物光电化学制氢电极奠定实验和理论基础。

Cu2ZnSnS4 (CZTS) semiconductor materials possessing a narrow band gap has a great application potential in photoelectrochemical water splitting for hydrogen production due to its advantages of low cost, non-toxic and high absorption coefficient. However, the long-term and efficient application of photoelectrochemical water splitting for hydrogen production has not been achieved because of its low separation efficiency of photogenerated charges and photocorrosion. In this project, we propose a strategy of choosing SnS2, g-C3N4, and Pt as the surface modification materials of CZTS, as well as constructing the Ⅱ type - direct Z-scheme heterogeneous structures to improve the photoelectrochemical performance and stability of CZTS. The controllable preparation of Pt/g-C3N4/SnS2/CZTS heterostructure photoelectrode will be achieved by preparing SnS2, g-C3N4, and Pt on CZTS films successively via surface modification methods, and studying the regulating effects of surface modification and reaction conditions on the phases, morphologis and carrier flow directions, etc. The regulating mechanism of photoelectrode's structure on photogenerated charges transfer will be revealed by analyzing the microscopic transfer processes of carriers via in-situ infrared spectroscopy and other technologies, combining with the physical structure and photoelectrochemical properties. Based on these researches, the life and photoelectrochemical activity of Pt/g-C3N4/SnS2/CZTS photoelectrodes will be evaluated. This work will lay the experimental and theoretical foundations for obtaining sulfide electrodes for photoelectrochemical hydrogen production with long-life and high-activity.