Abstract
The low charge separation efficiency between catalyst and cocatalyst severely limits the performance of photocatalysts. The strong interfacial interactions between catalyst and cocatalyst can improve the charge separation efficiency. Introducing interfacial chemical bonds to enhance the interfacial interaction between components is an effective way to improve photocatalytic performance. Herein, ZnIn2S4 (ZIS)/Sv-MoS2 photocatalyst was synthesized. The binding effect between S atoms in ZIS and the uncoordinated Mo atoms in Sv-MoS2 forms the interfacial Mo-S bond which greatly improves the photocatalytic activity of ZIS. The MoS2-xh was prepared by NaBH4 etching for different times. This extraordinary photocatalytic activity is mainly due to the easy transfer of photogenerated electrons from ZIS to MoS2via the heterojunction interface tightly connected under the action of Mo-S bonds. Photoelectric measurements show that ZIS/MoS2-4h possesses effective charge transfer. This work reveals the effect of the introduction of interfacial chemical bonds on the photocatalytic activity of ZIS/MoS2, and provides a simple and effective method for designing excellent cocatalysts through interface engineering.
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摘要
催化剂与助催化剂之间的低电荷分离效率严重限制了光催化性能. 催化剂与助催化剂之间的**界面相互作用可以提高电荷分离效率. 通过引入界面化学键增**组分间的界面相互作用是提高光催化性能的有效手段之一. 本文合成了ZnIn2S4 (ZIS)/Sv-MoS2光催化剂, ZIS中的S原子与Sv-MoS2中未配位Mo原子之间的键合作用形成了界面Mo-S键, 这极大地提高了ZIS的光催化活性. 采用不同的NaBH4蚀刻时间制备了MoS2-xh. 优化后的ZIS/MoS2-4h 复合材料的产氢速率为7.6 mmol g−1 h−1, 是原ZIS (1.6 mmol g−1 h−1)的4.75倍, 是ZIS/MoS2(3.7 mmol g−1 h−1)的2.05倍. 非凡的光催化活性可归因于光生电子在Mo-S键的作用下更容易从ZIS转移到MoS2. 光电测量表明, ZIS/MoS2-4h具有有效的电荷转移. 本工作揭示了引入界面化学键对ZIS/MoS2光催化活性的影响, 为通过界面工程设计优良的助催化剂提供了一种简单有效的方法.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China (2021YFA1501500), the National Natural Science Foundation of China (22033008, 22220102005, and 22171265), and Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China (2021ZZ103).
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Gao S and Ye S designed and engineered the experiments; Ye S performed the experiments and the characterizations; Ye S wrote the paper with support from Gao S and Cao R. All authors contributed to the general discussion.
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The authors declare that they have no conflict of interest.
Shihua Ye is currently a Master student at Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences (FJIRSM, CAS).
Shuiying Gao received her Master degree from Lanzhou Institute of Chemical Physics, CAS in 2002. She obtained her PhD degree from FJIRSM, CAS, in 2006. In 2014, she became a professor of FJIRSM. Her research interest focuses on thin-film materials and photocatalysis.
Rong Cao obtained his PhD degree from FJIRSM, CAS, in 1993. Following post-doctoral experience at the Hong Kong Polytechnic University and JSPS Fellowship at Nagoya University, he became a professor of FJIRSM in 1998. Now, he is the director of FJIRSM. His main research interests include supramolecular chemistry, inorganic-organic hybrid materials and nanocatalysts.
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Construction of ZnIn2S4/Sv-MoS2 photocatalysts with subtle atomic-level intimate contacts: enhancing interfacial interactions to improve photocatalytic H2 evolution in visible light
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Ye, S., Li, J., Feng, Y. et al. Construction of ZnIn2S4/Sv-MoS2 photocatalysts with subtle atomic-level intimate contacts: Enhancing interfacial interactions to improve photocatalytic H2 evolution in visible light. Sci. China Mater. 66, 3146–3154 (2023). https://doi.org/10.1007/s40843-023-2456-6
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DOI: https://doi.org/10.1007/s40843-023-2456-6