Improved charge separation in WO3/CuWO4 composite photoanodes for photoelectrochemical water oxidation

Porous tungsten oxide/copper tungstate (WO3/CuWO4) composite thin films were fabricated via a facile in situ conversion method, with a polymer templating strategy. Copper nitrate (Cu(NO3)2) solution with the copolymer surfactant Pluronic®F-127 (Sigma-Aldrich, St. Louis, MO, USA, generic name, poloxa...

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Main Authors: Wang, Danping, Qi, Huan, Zhao, Xin, Gurudayal, Xu, Rong, Sritharan, Thirumany, Chen, Zhong, Bassi, Prince Saurabh, Wong, Lydia Helena
Other Authors: School of Chemical and Biomedical Engineering
Format: Article
Language:English
Published: 2018
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Online Access:https://hdl.handle.net/10356/89448
http://hdl.handle.net/10220/46260
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-894482023-07-14T15:44:45Z Improved charge separation in WO3/CuWO4 composite photoanodes for photoelectrochemical water oxidation Wang, Danping Qi, Huan Zhao, Xin Gurudayal Xu, Rong Sritharan, Thirumany Chen, Zhong Bassi, Prince Saurabh Wong, Lydia Helena School of Chemical and Biomedical Engineering School of Materials Science & Engineering Charge Separation Composite Thin Film DRNTU::Engineering::Materials Porous tungsten oxide/copper tungstate (WO3/CuWO4) composite thin films were fabricated via a facile in situ conversion method, with a polymer templating strategy. Copper nitrate (Cu(NO3)2) solution with the copolymer surfactant Pluronic®F-127 (Sigma-Aldrich, St. Louis, MO, USA, generic name, poloxamer 407) was loaded onto WO3 substrates by programmed dip coating, followed by heat treatment in air at 550 °C. The Cu2+ reacted with the WO3 substrate to form the CuWO4 compound. The composite WO3/CuWO4 thin films demonstrated improved photoelectrochemical (PEC) performance over WO3 and CuWO4 single phase photoanodes. The factors of light absorption and charge separation efficiency of the composite and two single phase films were investigated to understand the reasons for the PEC enhancement of WO3/CuWO4 composite thin films. The photocurrent was generated from water splitting as confirmed by hydrogen and oxygen gas evolution, and Faradic efficiency was calculated based on the amount of H2 produced. This work provides a low-cost and controllable method to prepare WO3-metal tungstate composite thin films, and also helps to deepen the understanding of charge transfer in WO3/CuWO4 heterojunction. NRF (Natl Research Foundation, S’pore) Published version 2018-10-09T04:58:50Z 2019-12-06T17:25:44Z 2018-10-09T04:58:50Z 2019-12-06T17:25:44Z 2016 Journal Article Wang, D., Bassi, P. S., Qi, H., Zhao, X., Gurudayal, Wong, L. H., . . . Chen, Z. (2016). Improved charge separation in WO3/CuWO4 composite photoanodes for photoelectrochemical water oxidation. Materials, 9(5), 348-. doi:10.3390/ma9050348 1996-1944 https://hdl.handle.net/10356/89448 http://hdl.handle.net/10220/46260 10.3390/ma9050348 en Materials © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/). 13 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Charge Separation
Composite Thin Film
DRNTU::Engineering::Materials
spellingShingle Charge Separation
Composite Thin Film
DRNTU::Engineering::Materials
Wang, Danping
Qi, Huan
Zhao, Xin
Gurudayal
Xu, Rong
Sritharan, Thirumany
Chen, Zhong
Bassi, Prince Saurabh
Wong, Lydia Helena
Improved charge separation in WO3/CuWO4 composite photoanodes for photoelectrochemical water oxidation
description Porous tungsten oxide/copper tungstate (WO3/CuWO4) composite thin films were fabricated via a facile in situ conversion method, with a polymer templating strategy. Copper nitrate (Cu(NO3)2) solution with the copolymer surfactant Pluronic®F-127 (Sigma-Aldrich, St. Louis, MO, USA, generic name, poloxamer 407) was loaded onto WO3 substrates by programmed dip coating, followed by heat treatment in air at 550 °C. The Cu2+ reacted with the WO3 substrate to form the CuWO4 compound. The composite WO3/CuWO4 thin films demonstrated improved photoelectrochemical (PEC) performance over WO3 and CuWO4 single phase photoanodes. The factors of light absorption and charge separation efficiency of the composite and two single phase films were investigated to understand the reasons for the PEC enhancement of WO3/CuWO4 composite thin films. The photocurrent was generated from water splitting as confirmed by hydrogen and oxygen gas evolution, and Faradic efficiency was calculated based on the amount of H2 produced. This work provides a low-cost and controllable method to prepare WO3-metal tungstate composite thin films, and also helps to deepen the understanding of charge transfer in WO3/CuWO4 heterojunction.
author2 School of Chemical and Biomedical Engineering
author_facet School of Chemical and Biomedical Engineering
Wang, Danping
Qi, Huan
Zhao, Xin
Gurudayal
Xu, Rong
Sritharan, Thirumany
Chen, Zhong
Bassi, Prince Saurabh
Wong, Lydia Helena
format Article
author Wang, Danping
Qi, Huan
Zhao, Xin
Gurudayal
Xu, Rong
Sritharan, Thirumany
Chen, Zhong
Bassi, Prince Saurabh
Wong, Lydia Helena
author_sort Wang, Danping
title Improved charge separation in WO3/CuWO4 composite photoanodes for photoelectrochemical water oxidation
title_short Improved charge separation in WO3/CuWO4 composite photoanodes for photoelectrochemical water oxidation
title_full Improved charge separation in WO3/CuWO4 composite photoanodes for photoelectrochemical water oxidation
title_fullStr Improved charge separation in WO3/CuWO4 composite photoanodes for photoelectrochemical water oxidation
title_full_unstemmed Improved charge separation in WO3/CuWO4 composite photoanodes for photoelectrochemical water oxidation
title_sort improved charge separation in wo3/cuwo4 composite photoanodes for photoelectrochemical water oxidation
publishDate 2018
url https://hdl.handle.net/10356/89448
http://hdl.handle.net/10220/46260
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