Three-dimensional plasmonic photoanode of Co3O4 nanosheets coated onto TiO2 nanorod arrays for visible-light-driven water splitting |
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| Affiliation: | 1. School of Physical Science & Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450052, China;2. Instrumental Analysis and Research Centre, Sun Yat-sen University, Guangzhou 510275, China;3. School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China;1. SINTEF Industry, Department of Materials and Nanotechnology, Group of Nano and Hybrid Materials, Oslo, Norway;2. University of Oslo, Department of Chemistry, Centre for Materials Science and Nanotechnology, Oslo, Norway;1. Department of Metallurgy and Materials Engineering, Mehran University of Engineering and Technology, Jamshoro, Sindh, 76080, Pakistan;2. Department of Science and Technology, Campus Norrköping, Linköping University, Norrköping, SE-60174, Sweden;3. CNR-IMM, Via Piero Gobetti 101, Bologna, 40129, Italy;4. Dr. M.A Kazi Institute of Chemistry University of Sindh, Jamshoro, Sindh, 76080 Pakistan;5. Institute of Physics University of Sindh, Jamshoro, Sindh, 76080, Pakistan;6. Division of Material Science, Department of Engineering Sciences and Mathematics, Luleå University of Technology, Luleå, 97187, Sweden;7. Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, Via Torino 155, Venezia, Mestre, 30172, Italy;8. Department of Chemistry, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia;9. Chemistry Department “G.Ciamician”, University of Bologna, Bologna, 40126, Italy;1. Photoelectric and Energy Device Application Lab (PEDAL), Department of Electrical Engineering, Incheon National University, 119 Academy Rd., Yeonsu, Incheon 406772, South Korea;2. Department of Solar Energy, Pandit Deendayal Petroleum University, Raisan, Gandhinagar 382007, Gujarat, India;3. Department of Materials and Chemical Engineering, Hanyang University, Ansan, Kyunggido 426-791, South Korea |
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| Abstract: | In this work, we report for the first time a plasmonic photoanode by decorating Au nanoparticles (NPs) onto two-dimensional (2D) Co3O4 nanosheets (NSs)/one-dimensional (1D) TiO2 nanorod arrays (NRAs) (Au/Co3O4/TiO2-NRAs) for enhanced visible-light photoelectrochemical (PEC) water splitting. In this plasmonic photoanode, TiO2 NRAs act as an electron acceptor, plasmonic Au NPs and hierarchical Co3O4 NSs serve as visible-light harvesters. Light absorption shows that Au/Co3O4/TiO2-NRAs heterojunction architectures exhibit greatly improved ability to harvest visible light due to the surface plasmon resonance (SPR) absorption of Au NPs and visible light harvesting ability of Co3O4 NSs. Spectroscopic measurements demonstrate that a type II band alignment is formed between Co3O4 and TiO2. Benefiting from the SPR effect, type II band alignment and novel hierarchical architecture, plasmonic Au/Co3O4/TiO2-NRAs photoanode shows remarkably enhanced visible-light PEC water splitting activity compared with Co3O4/TiO2-NRAs and pristine TiO2-NRAs photoanodes. Photocurrent density achieved by plasmonic photoanode is 37 and 1.2 times higher than those of TiO2-NRAs and Co3O4/TiO2-NRAs photoanodes, respectively. This work provides a promising strategy to highly enhance visible-light PEC water splitting activity of wide band-gap semiconductor-based photoelectrode materials. |
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| Keywords: | Plasmon resonance Type II band alignment Hierarchical architectures Visible light Photoelectrochemical water splitting |
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