Pompon Dahlia-like Cu2O/rGO Nanostructures for Visible Light Photocatalytic H2 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

doi:10.1002/cctc.201902048

Pompon Dahlia-like Cu₂O/rGO Nanostructures for Visible Light Photocatalytic H₂ 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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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 language	English
Journal	ChemCatChem
Early online date	31 Jan 2020
DOIs	https://doi.org/10.1002/cctc.201902048
Publication status	E-pub ahead of print - 31 Jan 2020

Bibliographical note

© 2019 Wiley-VCH Verlag GmbH& Co. KGaA, Weinheim. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

Keywords

4-chlorophenol
CuO
hydrogen
photocatalysis
reduced graphene oxide

Access to Document

10.1002/cctc.201902048

Author accepted manuscript
© 2019 Wiley-VCH Verlag GmbH& Co. KGaA, Weinheim. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.
Accepted author manuscript, 2.06 MB

Cite this

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title = "Pompon Dahlia-like Cu2O/rGO Nanostructures for Visible Light Photocatalytic H2 Production and 4-Chlorophenol Degradation",

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.",

keywords = "4-chlorophenol, CuO, hydrogen, photocatalysis, reduced graphene oxide",

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AU - Lee, Adam F.

AU - Wilson, Karen

AU - Sasaki, Keiko

AU - Coulson, Ben

AU - Swansborough-Aston, Will

AU - Douthwaite, Richard E.

AU - Li, Wei

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N2 - 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.

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