Issue 5, 2022

2D-C3N4 encapsulated perovskite nanocrystals for efficient photo-assisted thermocatalytic CO2 reduction

Abstract

Very recently, halide perovskites, especially all-inorganic CsPbBr3, have received ever-increasing attention in photocatalysis owing to their superior optoelectronic properties and thermal stability. However, there is a lack of study on their application in thermocatalysis and photo-thermocatalysis. Herein, we rationally designed a core–shell heterojunction formed by encapsulating CsPbBr3 nanoparticles with the 2D C3N4 (m-CN) layer via a solid-state reaction (denoted as m-CN@CsPbBr3). A series of experiments suggest that abundant adsorption and active sites of CO2 molecules as well as polar surfaces were obtained by utilizing m-CN-coated CsPbBr3, resulting in significant improvement in CO2 capture and charge separation. It is found that the m-CN@CsPbBr3 effectively drives the thermocatalytic reduction of CO2 in H2O vapor. By coupling light into the system, the activity for CO2-to-CO reduction is further improved with a yield up to 42.8 μmol g−1 h−1 at 150 °C, which is 8.4 and 2.3 times those of pure photocatalysis (5.1 μmol g−1 h−1) and thermocatalysis (18.7 μmol g−1 h−1), respectively. This work expands the application of general halide perovskites and provides guidance for using perovskite-based catalysts for photo-assisted thermocatalytic CO2 reduction.

Graphical abstract: 2D-C3N4 encapsulated perovskite nanocrystals for efficient photo-assisted thermocatalytic CO2 reduction

Supplementary files

Article information

Article type
Edge Article
Submitted
04 nov 2021
Accepted
13 jan 2022
First published
18 jan 2022
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2022,13, 1335-1341

2D-C3N4 encapsulated perovskite nanocrystals for efficient photo-assisted thermocatalytic CO2 reduction

H. Bian, D. Li, S. Wang, J. Yan and S. (. Liu, Chem. Sci., 2022, 13, 1335 DOI: 10.1039/D1SC06131C

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