Pulsed sonoelectrodeposition of leaf-like Bi2WO6 film with exposed [001] facet as a photocathode with a remarkable high photovoltage in water splitting |
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| Affiliation: | 1. Sonochemical Research Center, Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran;2. Environmental Chemistry Research Center, Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran;1. College of Chemistry, Wuhan University of Technology, Wuhan 430000, Hubei, China;2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430000, Hubei, China;1. Thermal and Environmental Engineering Institute, School of Mechanical Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China;2. Shanghai Engineering Research Center of Multi-source Solid Wastes Co-processing and Energy Utilization, Shanghai 201804, China;1. College of Chemical Engineering, Zhejiang University of Technology, No.18 Chaowang Road, Hangzhou, Zhejiang, 310014, PR China;2. Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang, 315201, PR China;1. Department of Energy Science & Engineering, Indian Institute of Technology Bombay, Mumbai, India;2. Clean Energy Technologies Research Institute, Process Systems Engineering, Faculty of Engineering and Applied Science, University of Regina, 3737 Wascana Parkway, Regina, SK, Canada;3. Faculty of Science and Engineering, Laboratory of Energy Technology, Åbo Akademi University, Rantakatu 2, 65101, Vaasa, Finland;1. Center for Combustion Energy, Tsinghua University, Beijing, 100084, China;2. Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China;3. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing, 100084, China |
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| Abstract: | Bi2WO6 is one of the promising triplet bismuth compound that has a layered structure with a high photocatalytic activity for photo-electrochemical (PEC) water splitting systems. Here, Bi2WO6 synthesizes by the sonoelectrochemical method in pulse mode of ultrasound. Unexpectedly, synthetic samples show photocathode rather than photoanode activity in PEC systems. Applying of this method creates a leaf-like morphology with exposed [001] crystal facet and controllable amount of surface defects. The co-existence of oxygen and metal vacancies play a significant role in suppressing charge recombination and enhancing charge transporting in photoelectrodes. The creation of high surface vacancies leads to change the conduction and valence band positions and cause hydrogen evolution by Bi2WO6 photoelectrodes. Another surprising result for the synthesized film by pulse mode is the creation of high photovoltage about 1.25 V that has a remarkable effect in suppressing charge recombination rate and proposed driving force for water reduction. Furthermore, the onset potential of the photoelectrodes improves and records high efficiencies (ABPE = 2.46% at −0.8 V and IPCE≈28% at 450 nm). The obtaining results introduces the sonoelectrochemical method as a promising method for the synthesis of highly efficient photoelectrodes. |
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| Keywords: | Sonoelectrochemical deposition photoelectrode Vacancy High photovoltage PEC water Splitting |
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