Issue 35, 2021

Ultrathin 2D/2D Ti3C2Tx/semiconductor dual-functional photocatalysts for simultaneous imine production and H2 evolution

Abstract

Ultrathin 2D/2D Ti3C2Tx/semiconductor (CdS and Bi2MoO6) dual-functional photocatalysts have been constructed for the oxidative coupling of benzylamines to imines combined with H2 generation under visible light irradiation (λ ≥420 nm). The optimal 2D/2D Ti3C2Tx/CdS sample exhibits high photocatalytic performance toward H2 evolution (219.7 μmol g−1 h−1) and imine production (155.8 μmol g−1 h−1), which is 5 times and 6 times higher than that of pure CdS, respectively. In situ irradiated XPS and photoelectrochemical characterizations reveal that the enhanced photoactivity over Ti3C2Tx/semiconductor heterostructures can be attributed to the facilitated charge separation from the semiconductors to the Ti3C2Tx cocatalyst. A possible reaction mechanism is proposed based on in situ FTIR spectroscopy of benzylamine adsorption and imine product desorption and reaction intermediate detection using in situ ESR. This work provides a systematic strategy to construct ultrathin 2D/2D Ti3C2Tx/semiconductor heterojunctions for photocatalytic synthesis of high value-added products combined with H2 generation.

Graphical abstract: Ultrathin 2D/2D Ti3C2Tx/semiconductor dual-functional photocatalysts for simultaneous imine production and H2 evolution

Supplementary files

Article information

Article type
Paper
Submitted
28 apr 2021
Accepted
13 iyl 2021
First published
13 iyl 2021

J. Mater. Chem. A, 2021,9, 19984-19993

Ultrathin 2D/2D Ti3C2Tx/semiconductor dual-functional photocatalysts for simultaneous imine production and H2 evolution

H. Wang, P. Hu, J. Zhou, M. B. J. Roeffaers, B. Weng, Y. Wang and H. Ji, J. Mater. Chem. A, 2021, 9, 19984 DOI: 10.1039/D1TA03573H

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