Photocatalysis and Photoelectrochemical Properties of Tungsten Trioxide Nanostructured Films
Tungsten trioxide (WO3) possesses a small band gap energy of 2.4–2.8 eV and is responsive to both ultraviolet and visible light irradiation including strong absorption of the solar spectrum and stable physicochemical properties. Thus, controlled growth of one-dimensional (1D) WO3 nanotubular structu...
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| Language: | English |
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Wiley
2014-01-01
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| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1155/2014/843587 |
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| author | Chin Wei Lai |
| author_facet | Chin Wei Lai |
| author_sort | Chin Wei Lai |
| collection | DOAJ |
| description | Tungsten trioxide (WO3) possesses a small band gap energy of 2.4–2.8 eV and is responsive to both ultraviolet and visible light irradiation including strong absorption of the solar spectrum and stable physicochemical properties. Thus, controlled growth of one-dimensional (1D) WO3 nanotubular structures with desired length, diameter, and wall thickness has gained significant interest. In the present study, 1D WO3 nanotubes were successfully synthesized via electrochemical anodization of tungsten (W) foil in an electrolyte composed of 1 M of sodium sulphate (Na2SO4) and ammonium fluoride (NH4F). The influence of NH4F content on the formation mechanism of anodic WO3 nanotubular structure was investigated in detail. An optimization of fluoride ions played a critical role in controlling the chemical dissolution reaction in the interface of W/WO3. Based on the results obtained, a minimum of 0.7 wt% of NH4F content was required for completing transformation from W foil to WO3 nanotubular structure with an average diameter of 85 nm and length of 250 nm within 15 min of anodization time. In this case, high aspect ratio of WO3 nanotubular structure is preferred because larger active surface area will be provided for better photocatalytic and photoelectrochemical (PEC) reactions. |
| format | Article |
| id | doaj-art-ba61e97f5d68420d85cc5e749f9b548d |
| institution | Kabale University |
| issn | 2356-6140 1537-744X |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Scientific World Journal |
| spelling | doaj-art-ba61e97f5d68420d85cc5e749f9b548d2025-02-03T06:13:49ZengWileyThe Scientific World Journal2356-61401537-744X2014-01-01201410.1155/2014/843587843587Photocatalysis and Photoelectrochemical Properties of Tungsten Trioxide Nanostructured FilmsChin Wei Lai0Nanotechnology & Catalysis Research Centre (NANOCAT), Institute of Postgraduate Studies (IPS), University of Malaya, 3rd Floor, Block A, 50603 Kuala Lumpur, MalaysiaTungsten trioxide (WO3) possesses a small band gap energy of 2.4–2.8 eV and is responsive to both ultraviolet and visible light irradiation including strong absorption of the solar spectrum and stable physicochemical properties. Thus, controlled growth of one-dimensional (1D) WO3 nanotubular structures with desired length, diameter, and wall thickness has gained significant interest. In the present study, 1D WO3 nanotubes were successfully synthesized via electrochemical anodization of tungsten (W) foil in an electrolyte composed of 1 M of sodium sulphate (Na2SO4) and ammonium fluoride (NH4F). The influence of NH4F content on the formation mechanism of anodic WO3 nanotubular structure was investigated in detail. An optimization of fluoride ions played a critical role in controlling the chemical dissolution reaction in the interface of W/WO3. Based on the results obtained, a minimum of 0.7 wt% of NH4F content was required for completing transformation from W foil to WO3 nanotubular structure with an average diameter of 85 nm and length of 250 nm within 15 min of anodization time. In this case, high aspect ratio of WO3 nanotubular structure is preferred because larger active surface area will be provided for better photocatalytic and photoelectrochemical (PEC) reactions.http://dx.doi.org/10.1155/2014/843587 |
| spellingShingle | Chin Wei Lai Photocatalysis and Photoelectrochemical Properties of Tungsten Trioxide Nanostructured Films The Scientific World Journal |
| title | Photocatalysis and Photoelectrochemical Properties of Tungsten Trioxide Nanostructured Films |
| title_full | Photocatalysis and Photoelectrochemical Properties of Tungsten Trioxide Nanostructured Films |
| title_fullStr | Photocatalysis and Photoelectrochemical Properties of Tungsten Trioxide Nanostructured Films |
| title_full_unstemmed | Photocatalysis and Photoelectrochemical Properties of Tungsten Trioxide Nanostructured Films |
| title_short | Photocatalysis and Photoelectrochemical Properties of Tungsten Trioxide Nanostructured Films |
| title_sort | photocatalysis and photoelectrochemical properties of tungsten trioxide nanostructured films |
| url | http://dx.doi.org/10.1155/2014/843587 |
| work_keys_str_mv | AT chinweilai photocatalysisandphotoelectrochemicalpropertiesoftungstentrioxidenanostructuredfilms |