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Communication

Rational design of ZnCdS/TpPa-1-COF heterostructure photocatalyst by strengthening the interface connection in solar hydrogen production reactions

Di Yang1, Zhi-Gang Li1, Xinghao Zhang1, Zenghuan Ren1, Weihan Lu2, Haining Liu2, Xiaomeng Guo2( ), Jijie Zhang1( ), Xian-He Bu1,3
Tianjin Key Laboratory of Metal and Molecule-Based Material Chemistry, School of Materials Science and Engineering, Nankai University, Tianjin 300350, China
College of Chemistry and Pharmaceutical Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China
State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
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Graphical Abstract

The unique zero-dimensional–two-dimensional (0D–2D) ZnCdS/TpPa-1-COF materials (COF = covalent organic framework) could effectively enhance the photocatalytic hydrogen evolution performance of ZnCdS. This was due to the heterojunction structure formed between ZnCdS and TpPa-1-COF, which facilitated the easy transfer of electrons from TpPa-1-COF to ZnCdS.

Abstract

ZnCdS quantum dots (QDs) are highly coveted in photocatalysis research for their exceptional visible-light responses and high light-absorption coefficients. However, their practical application is hindered by their tendency to aggregate, due to having high surface energies. To address this issue, herein, a heterostructure is synthesized by growing ZnCdS QDs with a size of approximately 5 nm onto the surface of a two-dimensional (2D) covalent organic framework (COF), TpPa-1-COF. This approach suppresses the aggregation of the QDs and improves their stability. The ZnCdS/TpPa-1-COF composite exhibited a peak hydrogen evolution rate of 6244.16 μmol·g−1·h−1, which was 2.89 and 4.18 times greater than that of ZnCdS and TpPa-1-COF, respectively. The zero-dimensional/two-dimensional (0D/2D) heterojunction formed by ZnCdS and TpPa-1-COF generates a strong interfacial force, which is attributed to the intimate contact between the interfaces. Tight connections accelerate charge separation, improve the utilisation of reduced electrons, and reduce the extent of agglomeration of the ZnCdS QDs, thereby resulting in high hydrogen production activity of the composites. Meanwhile, the photocatalytic mechanism is studied using Kelvin probe force microscopy and theoretical calculations. This study offers a novel approach for creating sulfide photocatalysts and is crucial for investigating the potential practical applications of the related photocatalysts.

Keywords

covalent organic frameworksquantum dotsphotocatalysishydrogen generationheterojunction

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Nano Research
Volume 17 Issue 3,
March 2024
Pages 1027-1034
DOI: 10.1007/s12274-023-5991-5
Cite this article:
Yang D, Li Z-G, Zhang X, et al. Rational design of ZnCdS/TpPa-1-COF heterostructure photocatalyst by strengthening the interface connection in solar hydrogen production reactions. Nano Research, 2024, 17(3): 1027-1034. https://doi.org/10.1007/s12274-023-5991-5
Topics:
Photocatalysts

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Received: 17 May 2023
Revised: 25 June 2023
Accepted: 08 July 2023
Published: 31 July 2023
© Tsinghua University Press 2023
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