P25@CoAl layered double hydroxide heterojunction nanocomposites for CO2 photocatalytic reduction

Abstract

Artificial photosynthesis driven by inorganic photocatalysts offers a promising route to renewable solar fuels, however efficient CO2 photoreduction remains a challenge. A family of hierarchical nanocomposites, comprising P25 nanoparticles encapsulated within microporous CoAl-layered double hydroxides (CoAl-LDHs) were prepared via a one-pot hydrothermal synthesis. Heterojunction formation between the visible light absorbing CoAl-LDH and UV light absorbing P25 semiconductors extends utilisation of the solar spectrum, while the solid basicity of the CoAl-LDH increases CO2 availability at photocatalytic surfaces. Matching of the semiconductor band structures and strong donor–acceptor coupling improves photoinduced charge carrier separation and transfer via the heterojunction. Hierarchical P25@CoAl-LDH nanocomposites exhibit good activity and selectivity (>90%) for aqueous CO2 photoreduction to CO, without a sacrificial hole acceptor. This represents a facile and cost-effective strategy for the design and development of LDH-based nanomaterials for efficient photocatalysis for renewable solar fuel production from particularly CO2 and aqueous water.

Publication DOI: https://doi.org/10.1016/j.apcatb.2017.03.006
Divisions: Engineering & Applied Sciences
Engineering & Applied Sciences > Chemical Engineering & Applied Chemistry
Engineering & Applied Sciences > Energy and Bioproducts Research Institute (EBRI)
Additional Information: © 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license(http://creativecommons.org/licenses/by/4.0/). Funding: EPSRC (EP/K021796/1 and EP/K029525/2).
Uncontrolled Keywords: photocatalysis,CO2,titania,layered double hydroxide,nanocomposite,Catalysis,Environmental Science(all),Process Chemistry and Technology
Full Text Link:
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2017-07-15
Published Online Date: 2017-03-02
Accepted Date: 2017-03-01
Submitted Date: 2017-01-12
Authors: Kumar, Santosh ( 0000-0002-1352-9945)
Isaacs, Mark A.
Trofimovaite, Rima
Parlett, Christopher M.A. ( 0000-0002-3651-7314)
Douthwaite, Richard E.
Coulson, Ben
Cockett, Martin C.R.
Wilson, Karen ( 0000-0003-4873-708X)
Lee, Adam F.

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