Pompon Dahlia‐like Cu 2 O/rGO Nanostructures for Visible Light Photocatalytic H 2 Production and 4‐Chlorophenol Degradation

Sekar Karthikeyan, Kassam Ahmed, Amin Osatiashtiani, Adam F. Lee, Karen Wilson, Keiko Sasaki, Ben Coulson, Will Swansborough‐aston, Richard E. Douthwaite, Wei Li

Research output: Contribution to journalArticle

Abstract

Hierarchical Cu2O nanospheres with a Pompon Dahlia‐like morphology were prepared by a one‐pot synthesis employing electrostatic self‐assembly. Nanocomposite analogues were also prepared in the presence of reduced graphene oxide (rGO). Photophysical properties of the hierarchical Cu2O nanospheres and Cu2O/rGO nanocomposite were determined, and their photocatalytic applications evaluated for photocatalytic 4‐chlorophenol (4‐CP) degradation and H2 production. Introduction of trace (<1 wt %) rGO improves the apparent quantum efficiency (AQE) at 475 nm of hierarchical Cu2O for H2 production from 2.23 % to 3.35 %, giving an increase of evolution rate from 234 μmol.g−1.h−1 to 352 μmol.g−1.h−1 respectively. The AQE for 4‐CP degradation also increases from 52 % to 59 %, with the removal efficiency reaching 95 % of 10 ppm 4‐CP within 1 h. Superior performance of the hierarchical Cu2O/rGO nanocomposite is attributable to increased visible light absorption, reflected in a greater photocurrent density. Excellent catalyst photostability for >6 h continuous reaction is observed.
Original languageEnglish
JournalChemCatChem
Early online date17 Dec 2019
DOIs
Publication statusE-pub ahead of print - 17 Dec 2019

Bibliographical note

This is the peer reviewed version of the following article: Karthikeyan, S., Ahmed, K., Osatiashtiani, A., Lee, A.F., Wilson, K., Sasaki, K., Coulson, B., Swansborough‐Aston, W., Douthwaite, R.E. and Li, W. (2020), Pompon Dahlia‐like Cu2O/rGO Nanostructures for Visible Light Photocatalytic H2 Production and 4‐Chlorophenol Degradation. ChemCatChem, which has been published in final form at https://doi.org/10.1002/cctc.201902048.  This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.

Funding: Royal Society and Science and Engineering Research Board. Grant Number: NF151399; Biotechnology and Biological Sciences Research Council. Grant Number: BB/P022685/1; Japan Society for the Promotion of Science. Grant Number: P18387; KAKENHI. Grant Number: JP18F18387

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