Issue 40, 2023

Sulphur vacancy driven phase conversion of MoS2 nanosheets for efficient photoreduction of CO2 under visible light

Abstract

Vacancy-rich systems have immense importance in the field of catalysis due to their active coordination and electron-rich characteristics. Molybdenum disulfide (MoS2) has attracted much attention due to its promising photocatalytic properties in solar fuel production from water splitting and CO2 reduction. By creating S vacancies on the basal plane, we have enriched the surface of MoS2 with more catalytically active sites. Moreover, the S vacancy enables the conversion of the stable 2H phase to catalytically more active 1T′ phases. The presence of S-vacancies makes the 1T′ phase metallic. The surfactant-assisted exfoliation process adopted here also increases inter-lamellar spacing and, hence, increases its light absorption in the visible region. The simultaneous presence of the semiconducting 2H phase and metallic 1T′ phase enhances the separation of photogenerated electron–hole pairs. As a consequence, the exfoliated MoS2 nanosheet showed excellent photocatalytic activity towards CO2 reduction with an effective yield of 3.9 μmol g−1 h−1 for formic acid (HCOOH) and 9.9 μmol g−1 h−1 for methanol (CH3OH) after 14 hours of light irradiation. Through extensive experimental and theoretical studies, we have shown the importance of sulphur vacancies in the system and further established the reduction mechanism from CO2 to CH3OH.

Graphical abstract: Sulphur vacancy driven phase conversion of MoS2 nanosheets for efficient photoreduction of CO2 under visible light

  • This article is part of the themed collection: #MyFirstJMCA

Supplementary files

Article information

Article type
Paper
Submitted
28 יונ 2023
Accepted
17 ספט 2023
First published
19 ספט 2023

J. Mater. Chem. A, 2023,11, 21721-21734

Sulphur vacancy driven phase conversion of MoS2 nanosheets for efficient photoreduction of CO2 under visible light

K. Das, S. Lohkna, G. Yang, P. Ghosh and S. Roy, J. Mater. Chem. A, 2023, 11, 21721 DOI: 10.1039/D3TA03788F

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements