Abstract In recent years, environmental pollution and energy crisis have become increasingly serious issues owing to the burning of fossil fuels. Among the many technologies, decomposition of water to produce hydrogen has attracted much attention because of its sustainability and non-polluting characteristic. However, highly efficient decomposition of water that is driven by visible light is still a challenge. Herein, we report the large-scale preparation of step-scheme porous graphite carbon nitride/Zn0.2Cd0.8S-diethylenetriamine (Pg-C3N4/Zn0.2Cd0.8S-DETA) composite by a facile solvothermal method. It was found by UV-vis spectroscopy that 15%Pg-C3N4/Zn0.2Cd0.8S-DETA exhibited suitable visible absorption edge and band gap for water decomposition. The hydrogen production rate of 15%Pg-C3N4/Zn0.2Cd0.8S-DETA composite was 6.69 mmol g−1 h−1, which was 16.73, 1.61, and 1.44 times greater than those of Pg-C3N4, CdS-DETA, and Zn0.2Cd0.8S-DETA, respectively. In addition, 15%Pg-C3N4/Zn0.2Cd0.8S-DETA composite displayed excellent photocatalytic stability, which was maintained for seven cycles of photocatalytic water splitting test. We believe that 15%Pg-C3N4/Zn0.2Cd0.8S-DETA composite can be a valuable guide for the development of solar hydrogen production applications in the near future.

中文翻译：

---

阶梯式多孔 g-C3N4/Zn0.2Cd0.8S-DETA 复合材料用于高效稳定的光催化制氢

摘要 近年来，由于化石燃料的燃烧，环境污染和能源危机已成为日益严重的问题。在众多技术中，水分解制氢因其可持续性和无污染特性而备受关注。然而，在可见光驱动下高效分解水仍然是一个挑战。在此，我们报道了通过简便的溶剂热法大规模制备阶梯式多孔石墨碳氮化物/Zn0.2Cd0.8S-二亚乙基三胺（Pg-C3N4/Zn0.2Cd0.8S-DETA）复合材料。UV-vis光谱发现15%Pg-C3N4/Zn0.2Cd0.8S-DETA对水分解表现出合适的可见吸收边和带隙。15%Pg-C3N4/Zn0.2Cd0.8S-DETA复合材料的产氢率为6.69 mmol g-1 h-1，分别是 Pg-C3N4、CdS-DETA 和 Zn0.2Cd0.8S-DETA 的 16.73、1.61 和 1.44 倍。此外，15%Pg-C3N4/Zn0.2Cd0.8S-DETA复合材料表现出优异的光催化稳定性，在7个循环的光催化分解水试验中保持稳定。我们相信15%Pg-C3N4/Zn0.2Cd0.8S-DETA复合材料在不久的将来可以为太阳能制氢应用的发展提供有价值的指导。