Abstract
Graphite phase carbon nitride (g-C3N4) is a promising catalyst for artificial photocatalytic carbon dioxide (CO2) reduction. However, the fast carrier recombination and the inadequacy of the CO2 reduction active site in g-C3N4 block the escalation of the performance. In this work, NiCo layered double hydroxide (NiCo LDH) nanoflowers were self-assembled with ultrathin graphite phase carbon nitride (g-C3N4) by an ultrasonic stirring strategy utilizing the Zeta potential difference. The formed NiCo LDH/ultrathin g-C3N4 nanosheets (LDH-CN) photocatalysts own the merits of rich active sites and Z-scheme heterojunction, which lead to the enhanced CO2 reduction activity and selectivity. The highest yields of CO and CH4 were 114.24 and 26.48 μmol·h−1·g−1, which were much greater than those of g-C3N4 and LDH. Meanwhile, the enhanced selectivity for CO confirmed the strong redox ability in the LDH-CN caused by the Z-scheme. The heterojunction-induced built-in electrical field can promote the separation and migration of photoinduced electrons and holes. This study provides a theoretical basis for designing high-performance photocatalysts.
Graphical abstract
摘要
石墨相氮化碳(g-C3N4)是一种很有前途的人工光催化二氧化碳还原催化剂。然而, 载流子快速重组和g-C3N4中活性位点的不足阻碍了CO2还原性能的提升。本研究利用Zeta电位差, 采用超声搅拌的方法, 利用超薄石墨相氮化碳(g-C3N4)自组装NiCo层状双氢氧化物(NiCo LDH)纳米花形成的NiCo LDH/超薄g-C3N4纳米片(LDH-CN)光催化剂具有丰富的活性位点和Z型异质结的优点, 从而提高了CO2的还原活性和选择性。最高获得CO和CH4的产率分别为114.24和26.48 μmol·h−1·g−1, 远高于g-C3N4和LDH。同时, 对CO选择性的增强证实了Z型结构的LDH-CN具有较强的氧化还原能力。异质结诱导的内置电场可以促进光诱导电子和空穴的分离和迁移。本研究为高性能光催化剂的设计提供了理论和实验依据。
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Acknowledgements
This study was financially supported by the National Natural Science Foundation of China (Nos. 22005123, 21776118, 22178152 and 22008095), Jiangsu University Foundation (No. 20JDG16), Jiangsu Funds for Distinguished Young Scientists (No. BK20190045), the Special Foundation of China Postdoctoral (No. 2020TQ0127), Jiangsu Province Postdoctoral Science Foundation (Nos. 2021K396C and 2021K382C), Jiangsu Agricultural Science and Technology Independent Innovation Fund (No. CX (21)3067) and the Postgraduate High-tech Research Key Laboratory of Zhenjiang (No. SS2018002).
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Zhou, AQ., Yang, JM., Zhu, XW. et al. Self-assembly construction of NiCo LDH/ultrathin g-C3N4 nanosheets photocatalyst for enhanced CO2 reduction and charge separation mechanism study. Rare Met. 41, 2118–2128 (2022). https://doi.org/10.1007/s12598-022-01960-z
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DOI: https://doi.org/10.1007/s12598-022-01960-z