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Hamazaki S, Inoue K, Matsuda A, Kawamura G. Enhanced Photoelectrochemical Property of TiO 2 Nanotube Array Photoanode Deposited with Al,Cr-Codoped SrTiO 3 Nanocubes. ACS OMEGA 2024; 9:2795-2802. [PMID: 38250430 PMCID: PMC10795150 DOI: 10.1021/acsomega.3c08014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 12/13/2023] [Accepted: 12/15/2023] [Indexed: 01/23/2024]
Abstract
There is a demand for the effective utilization of solar energy with highly functional photoelectrodes for photoelectrochemical (PEC) applications, such as water splitting and CO2 reduction. TiO2 nanotube arrays (TNTA) with a large surface area have been studied as potential photoelectrodes mainly due to their strong oxidation potential. However, it has disadvantages of fast charge recombination and little responsivity to visible light. In this study, we prepared TNTA by anodizing a Ti plate and decorated the TNTA with Al,Cr-codoped SrTiO3 (STO) nanocubes through a hydrothermal treatment to enhance the PEC properties. We also prepared pristine and undoped STO-decorated TNTA for comparison. The hydrothermal treatment duration was optimized for the TNTA-STO:Al,Cr sample to achieve the best PEC performance. Finally, the possible PEC reaction mechanism was proposed based on the obtained experimental results.
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Affiliation(s)
- Shiho Hamazaki
- Department of Electric and
Electronic Information Engineering, Toyohashi
University of Technology, Toyohashi, Aichi 441-8580, Japan
| | - Kazuki Inoue
- Department of Electric and
Electronic Information Engineering, Toyohashi
University of Technology, Toyohashi, Aichi 441-8580, Japan
| | - Atsunori Matsuda
- Department of Electric and
Electronic Information Engineering, Toyohashi
University of Technology, Toyohashi, Aichi 441-8580, Japan
| | - Go Kawamura
- Department of Electric and
Electronic Information Engineering, Toyohashi
University of Technology, Toyohashi, Aichi 441-8580, Japan
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Kawamura G, Hirai D, Yamauchi S, Tan WK, Muto H, Matsuda A. Synergy Effect of Plasmonic Field Enhancement and Light Confinement in Mesoporous Titania-Coated Aluminum Nanovoid Photoelectrode. J Phys Chem Lett 2023; 14:11691-11696. [PMID: 38109358 PMCID: PMC10758215 DOI: 10.1021/acs.jpclett.3c03150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 11/30/2023] [Accepted: 12/14/2023] [Indexed: 12/20/2023]
Abstract
Photoelectrochemical (PEC) water splitting is a highly demanded technology for the realization of sustainable society. Various types of photoanodes have been developed to achieve high efficiency of PEC water splitting. Plasmonic field enhancement and light confinement effects are often adopted to improve PEC performance. However, their synergistic effects have not been studied. In this work, a mesoporous TiO2 layer was deposited on an Al plate with a nanovoid array structure, which acts as a photoanode and simultaneously exhibits a light confinement effect and surface plasmon resonance. The solo and synergy effects were investigated through experimental photocurrent measurements and theoretical simulations using the finite-difference time-domain method. The highest improvement in PEC performance was confirmed when the synergy effect occurred.
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Affiliation(s)
- Go Kawamura
- Department
of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan
| | - Daiki Hirai
- Department
of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan
| | - Shingo Yamauchi
- Department
of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan
| | - Wai Kian Tan
- Institute
of Liberal Arts and Science, Toyohashi, Aichi 441-8580, Japan
| | - Hiroyuki Muto
- Institute
of Liberal Arts and Science, Toyohashi, Aichi 441-8580, Japan
| | - Atsunori Matsuda
- Department
of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan
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Moridon SNF, Arifin K, Mohamed MA, Minggu LJ, Mohamad Yunus R, Kassim MB. TiO 2 Nanotubes Decorated with Mo 2C for Enhanced Photoelectrochemical Water-Splitting Properties. MATERIALS (BASEL, SWITZERLAND) 2023; 16:6261. [PMID: 37763538 PMCID: PMC10532882 DOI: 10.3390/ma16186261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 07/06/2023] [Accepted: 07/07/2023] [Indexed: 09/29/2023]
Abstract
The presence of Ti3+ in the structure of TiO2 nanotube arrays (NTs) has been shown to enhance the photoelectrochemical (PEC) water-splitting performance of these NTs, leading to improved results compared to pristine anatase TiO2 NTs. To further improve the properties related to PEC performance, we successfully produced TiO2 NTs using a two-step electrochemical anodization technique, followed by annealing at a temperature of 450 °C. Subsequently, Mo2C was decorated onto the NTs by dip coating them with precursors at varying concentrations and times. The presence of anatase TiO2 and Ti3O5 phases within the TiO2 NTs was confirmed through X-ray diffraction (XRD) analysis. The TiO2 NTs that were decorated with Mo2C demonstrated a photocurrent density of approximately 1.4 mA cm-2, a value that is approximately five times greater than the photocurrent density exhibited by the bare TiO2 NTs, which was approximately 0.21 mA cm-2. The observed increase in photocurrent density can be ascribed to the incorporation of Mo2C as a cocatalyst, which significantly enhances the photocatalytic characteristics of the TiO2 NTs. The successful deposition of Mo2C onto the TiO2 NTs was further corroborated by the characterization techniques utilized. The utilization of field emission scanning electron microscopy (FESEM) allowed for the observation of Mo2C particles on the surface of TiO2 NTs. To validate the composition and optical characteristics of the decorated NTs, X-ray photoelectron spectroscopy (XPS) and UV absorbance analysis were performed. This study introduces a potentially effective method for developing efficient photoelectrodes based on TiO2 for environmentally sustainable hydrogen production through the use of photoelectrochemical water-splitting devices. The utilization of Mo2C as a cocatalyst on TiO2 NTs presents opportunities for the advancement of effective and environmentally friendly photoelectrochemical (PEC) systems.
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Affiliation(s)
| | - Khuzaimah Arifin
- Fuel Cell Institute, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
| | - Mohamad Azuwa Mohamed
- Fuel Cell Institute, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
- Department of Chemical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
| | - Lorna Jeffery Minggu
- Fuel Cell Institute, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
| | - Rozan Mohamad Yunus
- Fuel Cell Institute, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
| | - Mohammad B. Kassim
- Fuel Cell Institute, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
- Department of Chemical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
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