Yang Chengwu, Qin Jiaqian, Rajendran Saravanan, Zhang Xinyu, Liu Riping
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, P. R. China.
Research Unit of Advanced Materials for Energy Storage, Metallurgy and Materials Science Research Institute, Chulalongkorn University, Bangkok, 10330, Thailand.
ChemSusChem. 2018 Dec 11;11(23):4077-4085. doi: 10.1002/cssc.201801819. Epub 2018 Oct 24.
Semiconductor photocatalysis is regarded as an ideal method for use in solving the energy shortage and environmental issues by converting solar energy to chemical energy. Herein, we have designed a facile synthetic methodology to obtain a ternary co-modified g-C N composite via WS and carbon-doped TiO (C-TiO ) nanorods with highly efficient photocatalytic activity for hydrogen production from deionized (DI) water and a natural seawater system under visible-light illumination. This composite exhibits enhanced photocatalytic activity compared to the pristine g-C N , WS , C-TiO nanorods, and the reference-modified g-C N composite with individual WS or C-TiO nanorods. Co-modified g-C N composite shows a great photostability in both DI water and seawater. Under λ=420 nm monochromatic light illumination, the apparent quantum efficiency of the co-modified g-C N composite in seawater solution is 13.08 %, which is higher than pure g-C N (5.06 %). WS , TiO , and g-C N constitute a ternary heterojunction boosting the fast separation of photoinduced electron-hole pairs, which plays a crucial role in enhancing photocatalytic activity. Therefore, the WS and C-TiO nanorod co-modified g-C N composite with high photocatalytic performance provides a promising candidate for rationally utilizing the seawater resource to produce clean chemical energy.
半导体光催化被认为是一种通过将太阳能转化为化学能来解决能源短缺和环境问题的理想方法。在此，我们设计了一种简便的合成方法，通过WS和碳掺杂TiO₂（C-TiO₂）纳米棒获得具有高效光催化活性的三元共改性g-C₃N₄复合材料，用于在可见光照射下从去离子（DI）水和天然海水系统中制氢。与原始的g-C₃N₄、WS₂、C-TiO₂纳米棒以及单独的WS₂或C-TiO₂纳米棒改性的g-C₃N₄复合材料相比，这种复合材料表现出增强的光催化活性。共改性的g-C₃N₄复合材料在DI水和海水中均表现出良好的光稳定性。在λ=420 nm单色光照射下，共改性的g-C₃N₄复合材料在海水溶液中的表观量子效率为13.08 %，高于纯g-C₃N₄（5.06 %）。WS₂、TiO₂和g-C₃N₄构成三元异质结，促进光生电子-空穴对的快速分离，这在增强光催化活性方面起着关键作用。因此，具有高光催化性能的WS₂和C-TiO₂纳米棒共改性g-C₃N₄复合材料为合理利用海水资源生产清洁化学能源提供了一个有前景的候选材料。
