Layered double hydroxides for H2 generation by the photoreforming of organic compounds

Camacho, Sandra Yurani Toledo, Cabello, Francisco Mediana, Iglesias, Sandra Contreras, Davies, Philip R. ORCID: https://orcid.org/0000-0003-4394-766X, Morgan, David J. ORCID: https://orcid.org/0000-0002-6571-5731 and Chachvalvutikul, Auttaphon 2025. Layered double hydroxides for H2 generation by the photoreforming of organic compounds. Catalysis Today 448 , 115168. 10.1016/j.cattod.2024.115168 Item availability restricted.

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Abstract

Layered Double-Hydroxides (LDH) materials are promising catalysts for solar-driven reactions thanks to their two-dimensional and the tunability of their composition. The preparation of three bimetallic NiFe-, NiCo- and ZnAl-LDH for H2 production by the photoreforming of glycerol under UV and visible irradiation has been investigated. Different modifications were studied: calcination, thermal reduction, plus Pt loading and TiO2 doping. Samples exhibited typical features of LDHs in XRD and hexagonal crystallites and the presence of some satellite bands were observed by HAADF-STEM and XPS, respectively, though only thermal treatments modified partially or completely the LDH structure. NiCo- and ZnAl-LDH have the weakest and the most stable LDH structures, respectively. Finally, on the unmodified NiFe- and NiCo-, and ZnAl-LDH materials, photoactivity showed zero activity toward H2 production, most likely due to their narrow and wide band gap (BG), respectively, but further thermal modifications, plus the incorporation of co-catalysts such as Pt and TiO2, promoted photocatalytic activity. On the LDH containing TiO2, the modifications had variable effect, for instance, Pt photodeposition significantly enhanced activity on ZnAl-LDH, but not on NiFe-LDH.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Chemistry Research Institutes & Centres > Cardiff Catalysis Institute (CCI)
Publisher:	Elsevier
ISSN:	0920-5861
Funders:	EPSRC
Date of First Compliant Deposit:	13 March 2025
Date of Acceptance:	14 December 2024
Last Modified:	14 Mar 2025 13:45
URI:	https://orca.cardiff.ac.uk/id/eprint/176858

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