Delaminated CoAl-Layered Double Hydroxide@TiO2 Heterojunction Nanocomposites for CO2 Photocatalytic Reduction

Santosh Kumar, Lee Durndell, Jinesh Manayil, Mark A. Isaacs, Christopher Parlett, Sekar Karthikeyan, Richard E. Douthwaite, Ben Coulson, Karen Wilson, Adam Lee*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Photocatalytic reduction offers an attractive route for CO2 utilization as a chemical feedstock for solar fuels production but remains challenging due to the poor efficiency, instability, and/or toxicity of current catalyst systems. Delaminated CoAl-layered double hydroxide nanosheets (LDH-DS) combined with TiO2 nanotubes (NTs) or nanoparticles (NPs) are promising nanocomposite photocatalysts for CO2 reduction. Heterojunction formation between visible light absorbing delaminated CoAl nanosheets and UV light absorbing TiO2 nanotubes greatly enhances interfacial contact between both high aspect ratio components relative to their bulk counterparts. The resulting synergic interaction confers a significant improvement in photoinduced charge carrier separation, and concomitant aqueous phase CO2 photocatalytic reduction, in the absence of a sacrificial hole acceptor. CO productivity for a 3 wt% LDH-DS@TiO2-NT nanocomposite of 4.57 μmol gcat -1 h-1 exhibits a
tenfold and fivefold increase over that obtained for individual TiO2 NT and delaminated CoAl-LDH components respectively and is double that obtained for 3 wt% bulk-LDH@TiO2-NT and 3 wt% LDH-DS@TiO2-NP catalysts. Synthesis of delaminated LDH and metal oxide nanocomposites represents a cost-effective strategy for aqueous phase CO2 reduction
Original languageEnglish
Article number1700317
Number of pages11
JournalParticle & Particle Systems Characterization
Early online date22 Nov 2017
DOIs
Publication statusPublished - Jan 2018

Bibliographical note

Copyright © 2017 by John Wiley & Sons. This is the peer reviewed version of the following article: Delaminated CoAl-Layered Double Hydroxide@TiO2 Heterojunction Nanocomposites for CO2 Photocatalytic Reduction
Kumar, S., Durndell, L., Manayil, J., Isaacs, M. A., Parlett, C., Karthikeyan, S., Douthwaite, R. E., Coulson, B., Wilson, K. & Lee, A. 22 Nov 2017 In : Particle & Particle Systems Characterization. 11 p., 1700317, which has been published in final form at http://doi.org/10.1002/ppsc.201700317. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.

Funding: EPSRC (EP/K021796/1 and EP/K029525/2).

Keywords

  • CO2
  • layered double hydroxides (LDHs)
  • photocatalysis
  • titania
  • nanocomposites

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