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Delaminated CoAl‐Layered Double Hydroxide@TiO 2 Heterojunction Nanocomposites for Photocatalytic Reduction of CO 2
Author(s) -
Kumar Santosh,
Durndell Lee J.,
Manayil Jinesh C.,
Isaacs Mark A.,
Parlett Christopher M. A.,
Karthikeyan Sekar,
Douthwaite Richard E.,
Coulson Ben,
Wilson Karen,
Lee Adam F.
Publication year - 2018
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201700317
Subject(s) - materials science , photocatalysis , nanocomposite , hydroxide , chemical engineering , aqueous solution , catalysis , oxide , visible spectrum , graphene , nanoparticle , nanotechnology , chemistry , organic chemistry , metallurgy , optoelectronics , engineering
Photocatalytic reduction offers an attractive route for CO 2 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 TiO 2 nanotubes (NTs) or nanoparticles (NPs) are promising nanocomposite photocatalysts for CO 2 reduction. Heterojunction formation between visible light absorbing delaminated CoAl nanosheets and UV light absorbing TiO 2 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 CO 2 photocatalytic reduction, in the absence of a sacrificial hole acceptor. CO productivity for a 3 wt% LDH‐DS@TiO 2 ‐NT nanocomposite of 4.57 µmol g cat ‐1 h ‐1 exhibits a tenfold and fivefold increase over that obtained for individual TiO 2 NT and delaminated CoAl‐LDH components respectively and is double that obtained for 3 wt% bulk‐LDH@TiO 2 ‐NT and 3 wt% LDH‐DS@TiO 2 ‐NP catalysts. Synthesis of delaminated LDH and metal oxide nanocomposites represents a cost‐effective strategy for aqueous phase CO 2 reduction.