The effect of materials architecture in TiO2/MOF composites on CO2 photoreduction and charge transfer

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Title: The effect of materials architecture in TiO2/MOF composites on CO2 photoreduction and charge transfer
Authors: Crake, A
Christoforidis, K
Gregg, A
Moss, B
Kafizas, A
Petit, C
Item Type: Journal Article
Abstract: CO2 photoreduction to C1/C1+ energized molecules is a key reaction of solar fuel technologies. Building heterojunctions can enhance photocatalysts performance, by facilitating charge transfer between two heterojunction phases. The material parameters that control this charge transfer remain unclear. Here, it is hypothesized that governing factors for CO2 photoreduction in gas phase are: i) a large porosity to accumulate CO2 molecules close to catalytic sites and ii) a high number of “points of contact” between the heterojunction components to enhance charge transfer. The former requirement can be met by using porous materials; the latter requirement by controlling the morphology of the heterojunction components. Hence, composites of titanium oxide or titanate and metal–organic framework (MOF), a highly porous material, are built. TiO2 or titanate nanofibers are synthesized and MOF particles are grown on the fibers. All composites produce CO under UV–vis light, using H2 as reducing agent. They are more active than their component materials, e.g., ≈9 times more active than titanate. The controlled composites morphology is confirmed and transient absorption spectroscopy highlights charge transfer between the composite components. It is demonstrated that electrons transfer from TiO2 into the MOF, and holes from the MOF into TiO2, as the MOF induces band bending in TiO2.
Issue Date: 15-Mar-2019
Date of Acceptance: 7-Jan-2019
URI: http://hdl.handle.net/10044/1/66972
DOI: https://doi.org/10.1002/smll.201805473
ISSN: 1613-6810
Publisher: Wiley
Journal / Book Title: Small
Volume: 15
Issue: 11
Copyright Statement: © 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is the pre-peer reviewed version of the following article, which has been published in final form at https://onlinelibrary.wiley.com/doi/full/10.1002/smll.201805473
Sponsor/Funder: Engineering and Physical Sciences Research Council
Engineering & Physical Science Research Council (EPSRC)
The Royal Society
Funder's Grant Number: EP/N024206/1
RSG\R1\180434
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
CO2 reduction
heterojunctions
metal-organic frameworks
photocatalysis
titanium dioxide
METAL-ORGANIC FRAMEWORKS
TRANSIENT ABSORPTION-SPECTROSCOPY
ENHANCED PHOTOCATALYTIC ACTIVITY
CARBON-DIOXIDE REDUCTION
TITANATE NANOTUBES
ANATASE TIO2
ARTIFICIAL PHOTOSYNTHESIS
FACILE SYNTHESIS
001 FACETS
PHASE
CO2 reduction
heterojunctions
metal-organic frameworks
photocatalysis
titanium dioxide
Nanoscience & Nanotechnology
Publication Status: Published
Embargo Date: 2020-02-04
Article Number: 1805473
Online Publication Date: 2019-02-04
Appears in Collections:Faculty of Engineering
Centre for Environmental Policy
Chemical Engineering
Faculty of Natural Sciences



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