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Effect of band bending in photoactive MOF-based heterojunctions.

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Title: Effect of band bending in photoactive MOF-based heterojunctions.
Authors: Schukraft, GEM
Moss, B
Kafizas, AG
Petit, C
Item Type: Journal Article
Abstract: Semiconductor/metal-organic framework (MOF) heterojunctions have demonstrated promising performance for the photoconversion of CO2 into value-added chemicals. To further improve performance, we must understand better the factors which govern charge transfer across the heterojunction interface. However, the effects of interfacial electric fields, which can drive or hinder electron flow, are not commonly investigated in MOF-based heterojunctions. In this study, we highlight the importance of interfacial band bending using two carbon nitride/MOF heterojunctions with either Co-ZIF-L or Ti-MIL-125-NH2. Direct measurement of the electronic structures using X-ray photoelectron spectroscopy (XPS), work function, valence band, and band gap measurements led to the construction of a simple band model at the heterojunction interface. This model, based on the heterojunction components and band bending, enabled us to rationalize the photocatalytic enhancements and losses observed in MOF-based heterojunctions. Using the insight gained from a promising band bending diagram, we developed a Type II carbon nitride/MOF heterojunction with a 2-fold enhanced CO2 photoreduction activity compared to the physical mixture.
Issue Date: 4-May-2022
Date of Acceptance: 12-Apr-2022
URI: http://hdl.handle.net/10044/1/96904
DOI: 10.1021/acsami.2c00335
ISSN: 1944-8244
Publisher: American Chemical Society
Start Page: 19342
End Page: 19352
Journal / Book Title: ACS Applied Materials and Interfaces
Volume: 14
Issue: 17
Copyright Statement: © 2022 The Authors. Published by American Chemical Society
Sponsor/Funder: The Royal Society
Funder's Grant Number: RSG\R1\180434
Keywords: CO2 reduction
band bending
graphitic carbon nitride
metal−organic frameworks
CO2 reduction
band bending
graphitic carbon nitride
metal−organic frameworks
Nanoscience & Nanotechnology
03 Chemical Sciences
09 Engineering
Publication Status: Published
Conference Place: United States
Appears in Collections:Chemistry
Chemical Engineering
Faculty of Natural Sciences
Faculty of Engineering