Issue 41, 2024

Chemically bonded interface construction of the covalent organic framework/CsPbBr3 heterojunction for efficient photocatalytic CO2 reduction driven by visible light

Abstract

Effective interface interaction is a key factor in enhancing photocatalytic performance due to rapid interfacial charge transport. However, the complex organic synthesis environment and abundance of surface ligands on most metal halide perovskite nanocrystals (MHP NCs) hinder the realization of strong interface interactions and rapid carrier transfer. Herein, a unique covalent organic framework (COF, TpBpy)/CsPbBr3 catalyst constructed by in situ growth of CsPbBr3 NCs on a COF in hydrobromic acid (HBr) solvent is formed with a chemical bond (Pb–N coordination) to enhance the CO2 photoreduction performance. The chemically bonded interface facilitates the transport of photoelectrons from CsPbBr3 NCs to TpBpy through the Pb–N bond, forming the TpBpy/CsPbBr3 heterojunction with strong interface interaction and enabling effective separation of photoexcited electron–hole pairs. As a result, the photocatalytic efficiency of the TpBpy/CsPbBr3 heterojunction reaches up to 239.46 μmol g−1 h−1 (CO) with a high selectivity of 99.66% under visible light irradiation, which is significantly higher than that of pure TpBpy (24.68 μmol g−1 h−1, 97.45%) and CsPbBr3 NCs (12.58 μmol g−1 h−1, 97.19%), and superior to previous reports on COF/perovskite heterojunctions. This work demonstrates a promising strategy for construction of a COF/MHP heterojunction with strong interface interaction, which has great potential for various optoelectronic applications.

Graphical abstract: Chemically bonded interface construction of the covalent organic framework/CsPbBr3 heterojunction for efficient photocatalytic CO2 reduction driven by visible light

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Article information

Article type
Paper
Submitted
16 Jul 2024
Accepted
12 Sep 2024
First published
14 Sep 2024

J. Mater. Chem. A, 2024,12, 28283-28295

Chemically bonded interface construction of the covalent organic framework/CsPbBr3 heterojunction for efficient photocatalytic CO2 reduction driven by visible light

M. Zhou, Z. Wang, A. Mei, K. Chen, J. Zeng, Y. Liu and W. Chen, J. Mater. Chem. A, 2024, 12, 28283 DOI: 10.1039/D4TA04913F

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