Abstract
Using halide perovskite nanomaterials for solar-to-fuel conversion has recently attracted a lot of attention due to their excellent photoelectric properties. However, severe photogenerated charge carrier recombinations and poor reaction kinetics greatly restrict their photocatalytic performance. In this study, a ternary WO3/CsPbBr3/ZIF-67 heterostructure was designed for efficient CO2 photoreduction. The results indicate that the Z-scheme charge transfer pathway constructed between WO3 and CsPbBr3 ensures the effective transfer and separation of photogenerated charge carriers. Meanwhile, the subsequent surface modification of zeolitic imidazolate frameworks (ZIF-67) with active Co centers further benefits CO2 adsorption and activation. Accordingly, the synergistic effects of charge separation and CO2 uptake greatly promote the photocatalytic activity. The optimal WO3/CsPbBr3/ZIF-67 heterostructure yields a CO production of 99.38 μmol g−1 in 3 h, which is 6.8 times of that produced by CsPbBr3. This work will inspire new insights in developing efficient photocatalysts for CO2 reduction and even more challenging photocatalytic reactions by elaborately regulating the functional ingredient.
摘要
近年来, 卤素钙钛矿纳米材料以其优异的光电性能在光催化等领域引起了关注. 然而, 光生载流子严重的复合反应和较差的反应动力学也极大地限制了其光催化性能. 本论文设计合成了一种三元WO3/CsPbBr3/ZIF-67异质光催化剂, 并将其应用于有效的CO2光还原反应. 研究表明, WO3与CsPbBr3之间构建的Z型电荷转移路径能够保证光生载流子的有效转移和分离. 此外, 在表面修饰具有活性Co中心的ZIF-67壳层作为助催化剂有利于改善复合材料的CO2的吸附和活化能力. 因此, 电荷分离和CO2吸附性能的增强大大提高了WO3/CsPbBr3/ZIF-67的光催化活性, 还原产物中CO产率达到99.38 μmol g−1, 是单一CsPbBr3的6.8倍. 这项工作有望为开发高效的卤素钙钛矿基光催化剂及其在 CO2还原和其他复杂光催化反应中的应用提供参考.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (21890382), the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01C161), Guangdong Basic and Applied Basic Research Foundation (2020A1515110937), and the Fundamental Research Funds for the Central Universities (19lgzd24 and 20lgpy80).
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Author contributions Chen HY and Su CY conceived the idea of this work and revised the manuscript; Dong YJ conducted the experiments and data analysis and wrote the manuscript; Jiang Y helped with the ESR measurement and mechanism analysis; Liao JF contributed to the TAS measurement and revised the manuscript; Kuang DB revised the manuscript and provided useful advice. All authors contributed to the general discussion.
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Yu-Jie Dong received her B.S. degree from Zhengzhou University in 2014 and received her Ph.D. degree from Sun Yat-sen University (SYSU) in 2019. She is now working as a postdoctoral research fellow with Professor Cheng-Yong Su at SYSU. Her current research interests focus on photocatalysis and photoelectrochemical applications.
Hong-Yan Chen is an associate professor at SYSU. She received her bachelor’s degree in 2005 from the Northeast Normal University and her Ph.D. degree in physical chemistry from the Institute of Chemistry, Chinese Academy of Sciences, in 2010. Her current research interest lies in functional nanocomposites, metal halide perovskites, photocatalysts and photoelectrochemical cells.
Cheng-Yong Su is a Professor at SYSU. He obtained his Ph.D. degree from Lanzhou University (1996), joined Prof. Wolfgang Kaim’s group at Stuttgart University (2001) as an Alexander von Humboldt Research Fellow, continued postdoctoral work with Prof. Hans-Conrad zur Loye at South Carolina University (2002), and has been working as a professor at SYSU since 2004. His research interest includes supramolecular coordination chemistry, metal-organic materials, and catalysis and nanoscience relevant to clean energy.
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Dong, YJ., Jiang, Y., Liao, JF. et al. Construction of a ternary WO3/CsPbBr3/ZIF-67 heterostructure for enhanced photocatalytic carbon dioxide reduction. Sci. China Mater. 65, 1550–1559 (2022). https://doi.org/10.1007/s40843-021-1962-9
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DOI: https://doi.org/10.1007/s40843-021-1962-9