Enhanced photocatalytic activity of electrosynthesised tungsten trioxide–titanium dioxide bi-layer coatings under ultraviolet and visible light illumination |
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| Affiliation: | 1. Rostislaw Kaischew Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria;2. Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece;1. SSN Research Centre, SSN College of Engineering, Kalavakkam 603 110, Chennai, India;2. Low Dimensional Materials Research Centre, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia;1. State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China;2. Institute of Environmental Health and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China;3. Centre for Clean Environment and Energy, Griffith University, Gold Coast Campus, QLD, 4222, Australia;4. School of Life Sciences, The Chinese University of Hong Kong, Shatin, NT, Hong Kong Special Administrative Region, China;5. Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan;1. Universidad Autónoma de Nuevo León, Facultad de Ingeniería Civil, Departamento de Ecomateriales y Energía, Av. Universidad S/N Ciudad Universitaria, San Nicolás de los Garza, Nuevo León C.P. 66450, México;2. Departmento de Física Aplicada, CINVESTAV-IPN, Antigua Carretera a Progreso km 6, Mérida, Yucatán 97310, México;3. Centro de Investigación en Materiales Avanzados S.C, Alianza norte 202, Parque de Investigación e Innovación Tecnológica, C.P. 66600 Apodaca Nuevo León, México;1. Department of Chemistry and Centre of Advanced Studies in Chemistry, Panjab University, Chandigarh 160 014, India;2. Department of Chemistry, College of Science and Arts, Najran University, Najran 11001, Saudi Arabia;3. Promising Centre for Sensors and Electronic Devices (PCSED), Najran University, Najran 11001, Saudi Arabia;4. Dr. S.S. Bhatnagar, UICET, Panjab University, Chandigarh 160 014, India |
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| Abstract: | Bi-layer WO3–TiO2 coatings have been synthesised on stainless steel (SS) substrates by consecutive cathodic electrodeposition of WO3 (from peroxytungstate solutions) and TiO2 electrosynthesis (from titanium oxosulfate solutions). The resulting TiO2–WO3/SS photoelectrodes have been screened for their photoresponse under ultraviolet (UV) and visible (vis) light illumination by photovoltammetry in supporting electrolyte (sodium sulfate) and malachite green (a typical dye) solutions. They were also evaluated for malachite green photooxidation during constant potential bulk photoelectrolysis. It was found that both photocurrent values and dye removal rates were higher at TiO2–WO3/SS than at plain WO3/SS photoelectrodes, under both UV and vis illumination (up to 85% and 67% malachite green degradation has been achieved respectively from its 10 ppm solutions after 2 h). The enhancement of the UV and, as reported here for the first time, vis photocatalytic activity of WO3 by the inclusion of TiO2 is interpreted by reduced electron-hole recombination rates due to electron transfer from TiO2 to WO3 (during UV activation) and hole transfer from WO3 to TiO2 (during UV and vis light activation). |
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