Issue 23, 2023

Promoting charge separation in a composite of δ-CsPbI3 and covalent organic frameworks

Abstract

In contrast to black CsPbI3 perovskite, yellow non-perovskite δ-CsPbI3 is thermodynamically more stable at room temperature and in humid conditions, but exhibits negligible photocatalytic activity due to its severe recombination of photogenerated charges. Here, we report a strategy to promote the charge separation in a composite of δ-CsPbI3 and TaPt-TP-COF by targeted deposition of metallic Pt particles on δ-CsPbI3. The photoluminescence band stemming from the recombination of excitons in δ-CsPbI3 is significantly quenched when attached to TaPt-TP-COF. The δ-CsPbI3, Pt@δ-CsPbI3 and δ-CsPbI3@TaPt-TP-COF exhibit negligible photocatalytic hydrogen evolution (PHE) from water in the presence of a triethanolamine electron donor, whereas the Pt@δ-CsPbI3@TaPt-TP-COF demonstrates a remarkable improvement in PHE rate. In addition, the Pt@δ-CsPbI3@TaPt-TP-COF also presents high stability in solution conditions.

Graphical abstract: Promoting charge separation in a composite of δ-CsPbI3 and covalent organic frameworks

Supplementary files

Article information

Article type
Communication
Submitted
06 Feb 2023
Accepted
15 May 2023
First published
16 May 2023

J. Mater. Chem. C, 2023,11, 7570-7574

Promoting charge separation in a composite of δ-CsPbI3 and covalent organic frameworks

G. Yuan, S. Feng, Q. Yang, F. Yi, X. Li, Y. Yuan, C. Wang and H. Yan, J. Mater. Chem. C, 2023, 11, 7570 DOI: 10.1039/D3TC00430A

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