Abstract

ZnO is a widely studied photocatalyst, but practical use is hindered by its low resistance to photocorrosion in water, which leads to metal leaching and loss of performance over time. In this work, highly porous and mechanically stable ZnO foams, called MolFoams, were doped by adding 1% or 2% Co, Ni or Cu salts to the starting Zn salt, followed by air insufflation during a sol–gel rection and sintering. The resulting doped foams showed a major increase in stability, with a 60–85% reduction in Zn2+ leaching after irradiation, albeit with a reduction in photocatalytic activity. A systematic analysis using XRD, Raman, XPS and XANES allowed for the identification of dopant species in the foams revealing the presence of Co3O4, NiO and Cu2O within the ZnO lattice with doping leading to a reduced band gap and significant increases in the resistance to photocorrosion of ZnO while identifying the cause of the reduction in photocatalytic activity to be shifting of the band edge positions. These results provide a pathway to significantly reduce the photocorrosion of ZnO in water, with further work required to maintain the photocatalytic activity of undoped ZnO.
Original languageEnglish
Pages (from-to)2438-2450
Number of pages13
JournalRSC Advances
Volume13
Issue number4
Early online date1 Jan 2023
DOIs
Publication statusPublished - 17 Jan 2023

Bibliographical note

Engineering and Physical Sciences Research Council
University of Bath

Funding Information:
The authors would like to acknowledge the EPSRC for funding (EP/P031382/1). Z.W. acknowledges The University of Bath for funding his Ph.D. Z.W. would also like to acknowledge P. Fletcher, D. Lednitzky and S. Reeksting of MC University of Bath analytical facilities, G. Kociok-Köhn of Department of Chemistry, J.A. Milton of The National Oceanography Centre Southampton and M. Isaacs of Harwell research facility for support and assistance in collection of the data presented here. 2

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