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Dr. Tsuyoshi Ochiai
Local Independent Administrative Agency Kanagawa Institute of industrial Science and TEChnology (KISTEC)

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0 Electrochemistry
0 Environmental Chemistry
0 Photoelectrochemistry
0 photocatalysts
0 Boron-doped Diamond Electrodes

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Journal article
Published: 23 November 2020 in ECS Meeting Abstracts
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ACS Style

Tsuyoshi Ochiai; Kengo Hamada; Kyohei Miyano; Yosuke Ishikawa; Toshinari Nagura; Noritaka Kimura. Environmentally Friendly Treatment of Textiles Using Electrochemically Generated O3-Water with UV Irradiation. ECS Meeting Abstracts 2020, MA2020-02, 1543 -1543.

AMA Style

Tsuyoshi Ochiai, Kengo Hamada, Kyohei Miyano, Yosuke Ishikawa, Toshinari Nagura, Noritaka Kimura. Environmentally Friendly Treatment of Textiles Using Electrochemically Generated O3-Water with UV Irradiation. ECS Meeting Abstracts. 2020; MA2020-02 (19):1543-1543.

Chicago/Turabian Style

Tsuyoshi Ochiai; Kengo Hamada; Kyohei Miyano; Yosuke Ishikawa; Toshinari Nagura; Noritaka Kimura. 2020. "Environmentally Friendly Treatment of Textiles Using Electrochemically Generated O3-Water with UV Irradiation." ECS Meeting Abstracts MA2020-02, no. 19: 1543-1543.

Journal article
Published: 02 November 2020 in Catalysts
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Chemicals for the scouring and bleaching of fabrics have a high environmental load. In addition, in recent years, the high consumption of these products has become a problem in the manufacture of natural fabric products. Therefore, environmentally friendly, low-waste processes for fabric treatment are required. In this paper, we discuss the bleaching of fabrics using advanced oxidation processes (AOP). These processes use electrochemically generated aqueous ozone and ultraviolet (UV) irradiation to achieve bleaching. However, colour reversion often occurs. In this study, we suppressed unwanted colour reversion by treatment with rongalite. After treatment, changes in fabric colour were determined by measuring the colour difference and reflectance spectra. The best bleaching effect was obtained when ozone and UV irradiation treatments were combined, achieving results similar to those of a conventional bleaching method after 60 min of UV irradiation. In addition, the AOP treatment resulted in the simultaneous scouring of the fabric, as shown by the increased hydrophilicity of the fabric after AOP treatment. Thus, this AOP process represents a new fabric bleaching process that has an extremely low environmental impact.

ACS Style

Kengo Hamada; Tsuyoshi Ochiai; Yasuyuki Tsuchida; Kyohei Miyano; Yosuke Ishikawa; Toshinari Nagura; Noritaka Kimura. Eco-Friendly Cotton/Linen Fabric Treatment Using Aqueous Ozone and Ultraviolet Photolysis. Catalysts 2020, 10, 1265 .

AMA Style

Kengo Hamada, Tsuyoshi Ochiai, Yasuyuki Tsuchida, Kyohei Miyano, Yosuke Ishikawa, Toshinari Nagura, Noritaka Kimura. Eco-Friendly Cotton/Linen Fabric Treatment Using Aqueous Ozone and Ultraviolet Photolysis. Catalysts. 2020; 10 (11):1265.

Chicago/Turabian Style

Kengo Hamada; Tsuyoshi Ochiai; Yasuyuki Tsuchida; Kyohei Miyano; Yosuke Ishikawa; Toshinari Nagura; Noritaka Kimura. 2020. "Eco-Friendly Cotton/Linen Fabric Treatment Using Aqueous Ozone and Ultraviolet Photolysis." Catalysts 10, no. 11: 1265.

Communication
Published: 11 June 2020 in Advanced Science
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Colored wide-bandgap semiconductor oxides with abundant mid-gap states have long been regarded as promising visible light responsive photocatalysts. However, their catalytic activities are hampered by charge recombination at deep level defects, which constitutes the critical challenge to practical applications of these oxide photocatalysts. To address the challenge, a strategy is proposed here that includes creating shallow-level defects above the deep-level defects and thermal activating the migration of trapped electrons out of the deep-level defects via these shallow defects. A simple and scalable solution plasma processing (SPP) technique is developed to process the presynthesized yellow TiO2 with numerous oxygen vacancies (Ov), which incorporates hydrogen dopants into the TiO2 lattice and creates shallow-level defects above deep level of Ov, meanwhile retaining the original visible absorption of the colored TiO2. At elevated temperature, the SPP-treated TiO2 exhibits a 300 times higher conversion rate for CO2 reduction under solar light irradiation and a 7.5 times higher removal rate of acetaldehyde under UV light irradiation, suggesting the effectiveness of the proposed strategy to enhance the photoactivity of colored wide-bandgap oxides for energy and environmental applications.

ACS Style

Fei Yu; Changhua Wang; Yingying Li; He Ma; Rui Wang; Yichun Liu; Norihiro Suzuki; Chiaki Terashima; Bunsho Ohtani; Tsuyoshi Ochiai; Akira Fujishima; Xintong Zhang. Enhanced Solar Photothermal Catalysis over Solution Plasma Activated TiO 2. Advanced Science 2020, 7, 2000204 .

AMA Style

Fei Yu, Changhua Wang, Yingying Li, He Ma, Rui Wang, Yichun Liu, Norihiro Suzuki, Chiaki Terashima, Bunsho Ohtani, Tsuyoshi Ochiai, Akira Fujishima, Xintong Zhang. Enhanced Solar Photothermal Catalysis over Solution Plasma Activated TiO 2. Advanced Science. 2020; 7 (16):2000204.

Chicago/Turabian Style

Fei Yu; Changhua Wang; Yingying Li; He Ma; Rui Wang; Yichun Liu; Norihiro Suzuki; Chiaki Terashima; Bunsho Ohtani; Tsuyoshi Ochiai; Akira Fujishima; Xintong Zhang. 2020. "Enhanced Solar Photothermal Catalysis over Solution Plasma Activated TiO 2." Advanced Science 7, no. 16: 2000204.

Paper
Published: 15 May 2020 in RSC Advances
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The electron energy structures of TiO2(B) and anatase were estimated by analyzing the energy-resolved distribution of electron traps.

ACS Style

Haruki Nagakawa; Tsuyoshi Ochiai; He Ma; Changhua Wang; Xintong Zhang; Yang Shen; Mai Takashima; Bunsho Ohtani; Morio Nagata. Elucidation of the electron energy structure of TiO2(B) and anatase photocatalysts through analysis of electron trap density. RSC Advances 2020, 10, 18496 -18501.

AMA Style

Haruki Nagakawa, Tsuyoshi Ochiai, He Ma, Changhua Wang, Xintong Zhang, Yang Shen, Mai Takashima, Bunsho Ohtani, Morio Nagata. Elucidation of the electron energy structure of TiO2(B) and anatase photocatalysts through analysis of electron trap density. RSC Advances. 2020; 10 (31):18496-18501.

Chicago/Turabian Style

Haruki Nagakawa; Tsuyoshi Ochiai; He Ma; Changhua Wang; Xintong Zhang; Yang Shen; Mai Takashima; Bunsho Ohtani; Morio Nagata. 2020. "Elucidation of the electron energy structure of TiO2(B) and anatase photocatalysts through analysis of electron trap density." RSC Advances 10, no. 31: 18496-18501.

Journal article
Published: 06 March 2020 in Catalysts
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The release of substantial amounts of toxicologically significant, irritant, and malodourous compounds during the complete combustion of tobacco can generate an unpleasant environment, especially indoors. Herein, we developed non-woven fabric-supported UV- and visible-light-responsive photocatalysts capable of adsorbing and decomposing the odour and tar components of tobacco smoke under irradiation with UV or visible light. The processes of odour component adsorption and subsequent decomposition under irradiation were evaluated in terms of colour changes in the catalytic system and by gas chromatography–mass spectrometry. By considering three different photocatalysts, namely TiO2, Fe(III)-grafted TiO2, and Cu(II)-grafted WO3, we assessed the magnitude of odour and tar component adsorption on the fabric fibres, as well as the decomposition of these species after specific visible light or UV irradiation periods. Considering the expansion of our technology for practical applications, the best results among the three tested materials were obtained for non-woven fabric-supported Fe/TiO2. We believe that our technology can be implemented in the design of interior decoration materials for creating a comfortable environment.

ACS Style

Tsuyoshi Ochiai; Daisuke Aoki; Hidenori Saito; Yasuhisa Akutsu; Morio Nagata. Analysis of Adsorption and Decomposition of Odour and Tar Components in Tobacco Smoke on Non-Woven Fabric-Supported Photocatalysts. Catalysts 2020, 10, 304 .

AMA Style

Tsuyoshi Ochiai, Daisuke Aoki, Hidenori Saito, Yasuhisa Akutsu, Morio Nagata. Analysis of Adsorption and Decomposition of Odour and Tar Components in Tobacco Smoke on Non-Woven Fabric-Supported Photocatalysts. Catalysts. 2020; 10 (3):304.

Chicago/Turabian Style

Tsuyoshi Ochiai; Daisuke Aoki; Hidenori Saito; Yasuhisa Akutsu; Morio Nagata. 2020. "Analysis of Adsorption and Decomposition of Odour and Tar Components in Tobacco Smoke on Non-Woven Fabric-Supported Photocatalysts." Catalysts 10, no. 3: 304.

Rapid communication
Published: 05 February 2020 in Chemistry Letters
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In this study, we fabricated a device that can be used for water purification in dark areas by combining a light-leakage type plastic optical fiber with a photocatalyst. The light-leakage type fiber was prepared by adding a scattering agent to the fiber core, and the titanium dioxide photocatalyst was composited by a two-layer coating method. Photocatalytic decomposition of methylene blue was performed by introducing light into the fiber without direct light irradiation.

ACS Style

Haruki Nagakawa; Takuya Sato; Goki Takahashi; Tsuyoshi Ochiai; Rei Furukawa; Morio Nagata. Water Purification in Dark Conditions Using Photocatalytic Light-leakage Type Plastic Optical Fiber. Chemistry Letters 2020, 49, 199 -202.

AMA Style

Haruki Nagakawa, Takuya Sato, Goki Takahashi, Tsuyoshi Ochiai, Rei Furukawa, Morio Nagata. Water Purification in Dark Conditions Using Photocatalytic Light-leakage Type Plastic Optical Fiber. Chemistry Letters. 2020; 49 (2):199-202.

Chicago/Turabian Style

Haruki Nagakawa; Takuya Sato; Goki Takahashi; Tsuyoshi Ochiai; Rei Furukawa; Morio Nagata. 2020. "Water Purification in Dark Conditions Using Photocatalytic Light-leakage Type Plastic Optical Fiber." Chemistry Letters 49, no. 2: 199-202.

Rapid communication
Published: 05 June 2019 in Chemistry Letters
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Electrochemical ozone generation at an easily prepared platinum-modified titanium electrode was investigated and compared with that at boron-doped diamond (BDD) and Pt electrodes. The Pt/Ti electrode was prepared through our original method, the multiple electrostrike method. The ozone generation ability of the Pt/Ti electrode was much higher than those of BDD and Pt electrodes. This research is expected to contribute to the development of practical electrodes for inexpensive and effective ozone generators.

ACS Style

Mio Hayashi; Tsuyoshi Ochiai; Shoko Tago; Hidenori Saito; Tsukaho Yahagi; Akira Fujishima. Electrolytic Ozone Generation at Pt/Ti Electrode Prepared by Multiple Electrostrike Method. Chemistry Letters 2019, 48, 574 -577.

AMA Style

Mio Hayashi, Tsuyoshi Ochiai, Shoko Tago, Hidenori Saito, Tsukaho Yahagi, Akira Fujishima. Electrolytic Ozone Generation at Pt/Ti Electrode Prepared by Multiple Electrostrike Method. Chemistry Letters. 2019; 48 (6):574-577.

Chicago/Turabian Style

Mio Hayashi; Tsuyoshi Ochiai; Shoko Tago; Hidenori Saito; Tsukaho Yahagi; Akira Fujishima. 2019. "Electrolytic Ozone Generation at Pt/Ti Electrode Prepared by Multiple Electrostrike Method." Chemistry Letters 48, no. 6: 574-577.

Journal article
Published: 26 April 2019 in Fibers
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A fiber-optic strain sensor that can show strain via color change and which can be viewed using human eyes has demand in the civil engineering field for alerting purposes. A previous sensor was fabricated using PMMA (Poly(methyl methacrylate)), which had the exceeding hardness to exhibit satisfactory sensor performance. In this research, an elastomer-based fiber-optic structure was fabricated to enhance the elastic response of such sensors and to enlarge the waveguide cross section. Various organic fluorophores were added to the core and cladding regions of the elastic waveguide to induce energy flow from the core to the cladding when stress is applied to the waveguide. Elastomer pairs suitable for the core and cladding were selected from among several candidate materials having high transparency. A method of dispersing fluorophores to each host elastomer and constructing an excellent core–cladding interface using the selected materials was proposed. To investigate the time-dependent changes in the fluorescence of the doped elastomer waveguide, the absorption and emission spectra were monitored after the host elastomers were cured.

ACS Style

Chie Hirose; Nobuko Fukuda; Takafumi Sassa; Koji Ishibashi; Tsuyoshi Ochiai; Rei Furukawa. Fabrication of a Fluorophore-Doped Cylindrical Waveguide Structure Using Elastomers for Visual Detection of Stress. Fibers 2019, 7, 37 .

AMA Style

Chie Hirose, Nobuko Fukuda, Takafumi Sassa, Koji Ishibashi, Tsuyoshi Ochiai, Rei Furukawa. Fabrication of a Fluorophore-Doped Cylindrical Waveguide Structure Using Elastomers for Visual Detection of Stress. Fibers. 2019; 7 (5):37.

Chicago/Turabian Style

Chie Hirose; Nobuko Fukuda; Takafumi Sassa; Koji Ishibashi; Tsuyoshi Ochiai; Rei Furukawa. 2019. "Fabrication of a Fluorophore-Doped Cylindrical Waveguide Structure Using Elastomers for Visual Detection of Stress." Fibers 7, no. 5: 37.

Journal article
Published: 13 March 2019 in Thin Solid Films
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Gold is a very attractive color and has been used for accessories since ancient times. However, obtaining gold luster from organic matter is extremely rare, and only a few materials can change color from gold to another color. In this paper, we report the fabrication of a color-changeable gold-like luster film from a polyaniline (PANI) film and a poly(3,4-ethylenedioxythiophene) (PEDOT) film by electropolymerization. The PANI/PEDOT composite film showed a gold-like luster at 1.0 V, and turned metallic green at −0.5 V. The color-changeable composite film can change appearance from gold-like luster to metallic green continuously, using only common organic polymers. The color-changeable composite film is expected to be used not only in painting materials, but also in display technologies owing to the color-changeable function.

ACS Style

Hayato Takada; Tsuyoshi Ochiai; Morio Nagata. Color-changeable gold luster film based on polyaniline and poly(3,4-ethylenedioxythiophene). Thin Solid Films 2019, 677, 33 -38.

AMA Style

Hayato Takada, Tsuyoshi Ochiai, Morio Nagata. Color-changeable gold luster film based on polyaniline and poly(3,4-ethylenedioxythiophene). Thin Solid Films. 2019; 677 ():33-38.

Chicago/Turabian Style

Hayato Takada; Tsuyoshi Ochiai; Morio Nagata. 2019. "Color-changeable gold luster film based on polyaniline and poly(3,4-ethylenedioxythiophene)." Thin Solid Films 677, no. : 33-38.

Journal article
Published: 05 January 2019 in Electrochemistry
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We fabricated TiO2-coated porous silica glass tubes containing macropores and evaluated their environmental purification capacity. We used two TiO2 coating methods: outside vapor deposition (OVD), and TiO2 precursor impregnation and calcination onto silica layers. The tubes exhibited air and water purification capabilities. Through a waterborne pathogens removal test, we confirmed that Escherichia coli and Legionella pneumophilia could be eliminated by filtration, even in conditions without UV-C irradiation. Moreover, the tube coated using OVD and irradiated with a UV-C lamp showed the highest Qβ reduction efficiency. The acetaldehyde decomposition properties under high-concentration conditions were outstanding (78% at 700 ppm). From methylene blue decomposition tests, we concluded that the efficiency of TiO2 photocatalytic decomposition was affected by multiple parameters, including the presence of anions and cations, as well as the solution pH.

ACS Style

Mio Hayashi; Tsuyoshi Ochiai; Shoko Tago; Hiromasa Tawarayama; Toshifumi Hosoya; Tsukaho Yahagi; Hitoshi Ishiguro; Akira Fujishima. Fabrication of TiO2-coated Porous Silica Glass Tube and Evaluation as Environmental Purification Unit. Electrochemistry 2019, 87, 1 -7.

AMA Style

Mio Hayashi, Tsuyoshi Ochiai, Shoko Tago, Hiromasa Tawarayama, Toshifumi Hosoya, Tsukaho Yahagi, Hitoshi Ishiguro, Akira Fujishima. Fabrication of TiO2-coated Porous Silica Glass Tube and Evaluation as Environmental Purification Unit. Electrochemistry. 2019; 87 (1):1-7.

Chicago/Turabian Style

Mio Hayashi; Tsuyoshi Ochiai; Shoko Tago; Hiromasa Tawarayama; Toshifumi Hosoya; Tsukaho Yahagi; Hitoshi Ishiguro; Akira Fujishima. 2019. "Fabrication of TiO2-coated Porous Silica Glass Tube and Evaluation as Environmental Purification Unit." Electrochemistry 87, no. 1: 1-7.

Rapid communication
Published: 05 December 2018 in Chemistry Letters
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We herein report the oxidation efficiency of different concentration ammonia waters via a complex photocatalyst of zeolite and TiO2 under UV light. The generated NO2− and NO3− concentrations were highest when a high concentration of ammonia was oxidized by zeolite–TiO2. The prepared photocatalyst was characterized via X-ray diffraction, and Brunauer–Emmett–Teller surface area measurement.

ACS Style

Sachiko Haga; Haruki Nagakawa; Tsuyoshi Ochiai; Morio Nagata. Photocatalytic Oxidation of Aqueous Ammonia to Nitrite and Nitrate Ions on Zeolite–TiO2. Chemistry Letters 2018, 47, 1542 -1544.

AMA Style

Sachiko Haga, Haruki Nagakawa, Tsuyoshi Ochiai, Morio Nagata. Photocatalytic Oxidation of Aqueous Ammonia to Nitrite and Nitrate Ions on Zeolite–TiO2. Chemistry Letters. 2018; 47 (12):1542-1544.

Chicago/Turabian Style

Sachiko Haga; Haruki Nagakawa; Tsuyoshi Ochiai; Morio Nagata. 2018. "Photocatalytic Oxidation of Aqueous Ammonia to Nitrite and Nitrate Ions on Zeolite–TiO2." Chemistry Letters 47, no. 12: 1542-1544.

Research article
Published: 26 November 2018 in ACS Applied Energy Materials
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Photocatalytic water splitting under visible-light has attracted attention as a possible solution to the energy exhaustion problem. Hitherto, water splitting has been generally achieved using several oxynitrides, oxysulfides, and nitrides, and only a few studies report of water splitting using cadmium sulfide (CdS) as a photocatalyst. A major reason for this is that CdS undergoes photocorrosion. In this study, we achieved an overall water splitting under visible-light using a CdS/WO3/CdWO4 tri-composite photocatalyst. In the process, photocorrosion of CdS was suppressed by covering it with WO3 and CdWO4 and the oxidation reaction progressed in WO3 by the Z-scheme type photocatalytic reaction.

ACS Style

Haruki Nagakawa; Tsuyoshi Ochiai; Seiji Konuma; Morio Nagata. Visible-Light Overall Water Splitting by CdS/WO3/CdWO4 Tricomposite Photocatalyst Suppressing Photocorrosion. ACS Applied Energy Materials 2018, 1, 6730 -6735.

AMA Style

Haruki Nagakawa, Tsuyoshi Ochiai, Seiji Konuma, Morio Nagata. Visible-Light Overall Water Splitting by CdS/WO3/CdWO4 Tricomposite Photocatalyst Suppressing Photocorrosion. ACS Applied Energy Materials. 2018; 1 (12):6730-6735.

Chicago/Turabian Style

Haruki Nagakawa; Tsuyoshi Ochiai; Seiji Konuma; Morio Nagata. 2018. "Visible-Light Overall Water Splitting by CdS/WO3/CdWO4 Tricomposite Photocatalyst Suppressing Photocorrosion." ACS Applied Energy Materials 1, no. 12: 6730-6735.

Research article
Published: 08 October 2018 in ACS Omega
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Visible-light-responsive photocatalysts used in the highly efficient hydrogen production exhibit several disadvantages such as photocorrosion and fast recombination. Because of the potential important applications of such catalysts, it is crucial that a simple, effective solution is developed. In this respect, in this study, we combined SiC (β modification) and TiO2 with CdS to overcome the challenges of photocorrosion and fast recombination of CdS. Notably, we found that when irradiated with visible light, CdS was excited, and the excited electrons moved to the conduction band of TiO2, thereby increasing the efficiency of charge separation. In addition, by moving the holes generated on CdS to the valence band of SiC, in the opposite direction of TiO2, photocorrosion and fast recombination were prevented. As a result, in the sulfide solution, the CdS/SiC composite catalyst exhibited 4.3 times higher hydrogen generation ability than pure CdS. Moreover, this effect was enhanced with the addition of TiO2, giving 10.8 times higher hydrogen generation ability for the CdS/SiC/TiO2 catalyst. Notably, the most efficient catalyst, which was obtained by depositing Pt as a cocatalyst, exhibited 1.09 mmol g-1 h-1 hydrogen generation ability and an apparent quantum yield of 24.8%. Because water reduction proceeded on the TiO2 surface and oxidative sulfide decomposition proceeded on the SiC surface, the exposure of CdS to the solution was unnecessary, and X-ray photoelectron spectroscopy confirmed that photocorrosion was successfully suppressed. Thus, we believe that the effective composite photocatalyst construction method presented herein can also be applied to other visible-light-responsive powder photocatalysts having the same disadvantages as CdS, thereby improving the efficiency of such catalysts.

ACS Style

Haruki Nagakawa; Tsuyoshi Ochiai; Yuya Takekuma; Seiji Konuma; Morio Nagata. Effective Photocatalytic Hydrogen Evolution by Cascadal Carrier Transfer in the Reverse Direction. ACS Omega 2018, 3, 12770 -12777.

AMA Style

Haruki Nagakawa, Tsuyoshi Ochiai, Yuya Takekuma, Seiji Konuma, Morio Nagata. Effective Photocatalytic Hydrogen Evolution by Cascadal Carrier Transfer in the Reverse Direction. ACS Omega. 2018; 3 (10):12770-12777.

Chicago/Turabian Style

Haruki Nagakawa; Tsuyoshi Ochiai; Yuya Takekuma; Seiji Konuma; Morio Nagata. 2018. "Effective Photocatalytic Hydrogen Evolution by Cascadal Carrier Transfer in the Reverse Direction." ACS Omega 3, no. 10: 12770-12777.

Journal article
Published: 02 October 2018 in Journal of Physics and Chemistry of Solids
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Noble metal-based bimetallic alloy nanostructures became popular for methanol oxidation reaction (MOR) in order to lower the high cost of the Pt catalyst and improve the catalyst activity as well as their CO tolerance. Fabrication of the secondary structures of bimetallic alloy nanocrystal clusters is desired due to their abundant accessible active sites and enhanced stability. Herein, for the first time, we prepared novel Pt-Cu bimetallic alloy nanocrystal clusters (Pt-Cu BANCs) in the presence of poly(diallyldimethylammonium chloride) (PDDA). The selective use of PDDA and control of the amount of PDDA are critical to the controlled fabrication of secondary structures with nanograins assembled together. The Pt-Cu BANCs offered abundant active sites available and enhanced durable stability, and are investigated to be high-performance electrocatalysts for MOR (i.e. the ECSAs of Pt-Cu BANCs and the specific current density of methanol oxidation on Pt-Cu BANCs are 73.9 m2/g and 3.36 mA·cm-2, respectively), which are far better than those of commercial Pt/C and Pt black. Our results reported herein developed an effective strategy of polyelectrolyte-assisted soft reduced process for the creation of the secondary structures of bimetallic alloy nanocrystal clusters, which would be used as enhanced catalysts in the field of clean energy.

ACS Style

Rui Li; Shengnan Li; Yong Liu; Tsuyoshi Ochiai; Sanjay S. Latthe; Kazuya Nakata; Ruimin Xing; Shanhu Liu. Polyelectrolyte-assisted soft reduced process for Pt-Cu nanoclusters with enhanced electrocatalytic activity for the methanol oxidation reaction. Journal of Physics and Chemistry of Solids 2018, 124, 361 -366.

AMA Style

Rui Li, Shengnan Li, Yong Liu, Tsuyoshi Ochiai, Sanjay S. Latthe, Kazuya Nakata, Ruimin Xing, Shanhu Liu. Polyelectrolyte-assisted soft reduced process for Pt-Cu nanoclusters with enhanced electrocatalytic activity for the methanol oxidation reaction. Journal of Physics and Chemistry of Solids. 2018; 124 ():361-366.

Chicago/Turabian Style

Rui Li; Shengnan Li; Yong Liu; Tsuyoshi Ochiai; Sanjay S. Latthe; Kazuya Nakata; Ruimin Xing; Shanhu Liu. 2018. "Polyelectrolyte-assisted soft reduced process for Pt-Cu nanoclusters with enhanced electrocatalytic activity for the methanol oxidation reaction." Journal of Physics and Chemistry of Solids 124, no. : 361-366.

Communication
Published: 30 August 2018 in Catalysts
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Interfacial charge-transfer (ICT) transitions involved in charge-separation mechanisms are expected to enable efficient photovoltaic conversions through one-step charge-separation processes. With this in mind, the charge-transfer complex fabricated from TiO2 nanoparticles and 7,7,8,8-tetracyanoquinodimethane (TCNQ) has been applied to dye-sensitized solar cells. However, rapid carrier recombination from the conduction band of TiO2 to the highest occupied molecular orbital (HOMO) of TCNQ remains a major issue for this complex. In this study, to inhibit surface-complex recombinations, we prepared Nb-doped TiO2 nanoparticles with different atomic ratios for enhanced electron transport. To investigate the effects of doping on electron injection through ICT transitions, these materials were examined as photoelectrodes. When TiO2 was doped with 1.5 mol % Nb, the Fermi level of the TiO2 electrode shifted toward the conduction band minimum, which improved electron back-contact toward the HOMO of TCNQ. The enhancement in electron transport led to increases in both short circuit current and open circuit voltage, resulting in a slight (1.1% to 1.3%) improvement in photovoltaic conversion efficiency compared to undoped TiO2. Such control of electron transport within the photoelectrode is attributed to improvements in electron injection through ICT transitions.

ACS Style

Reo Eguchi; Yuya Takekuma; Tsuyoshi Ochiai; Morio Nagata. Improving Interfacial Charge-Transfer Transitions in Nb-Doped TiO2 Electrodes with 7,7,8,8-Tetracyanoquinodimethane. Catalysts 2018, 8, 367 .

AMA Style

Reo Eguchi, Yuya Takekuma, Tsuyoshi Ochiai, Morio Nagata. Improving Interfacial Charge-Transfer Transitions in Nb-Doped TiO2 Electrodes with 7,7,8,8-Tetracyanoquinodimethane. Catalysts. 2018; 8 (9):367.

Chicago/Turabian Style

Reo Eguchi; Yuya Takekuma; Tsuyoshi Ochiai; Morio Nagata. 2018. "Improving Interfacial Charge-Transfer Transitions in Nb-Doped TiO2 Electrodes with 7,7,8,8-Tetracyanoquinodimethane." Catalysts 8, no. 9: 367.

Journal article
Published: 25 May 2018 in Materials
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Photocatalysts have multiple applications in air purifiers, paints, and self-cleaning coatings for medical devices such as catheters, as well as in the elimination of xenobiotics. In this study, a coating of a UV-responsive photocatalyst, titanium dioxide (TiO2), was applied to an orthodontic resin. The antibacterial activity on oral bacteria as well as hydrophilic properties and mechanical properties of the TiO2-coated resin were investigated. ultraviolet A (UVA) (352 nm) light was used as the light source. Antibacterial activity was examined with or without irradiation. Measurements of early colonizers and cariogenic bacterial count, i.e., colony forming units (CFU), were performed after irradiation for different time durations. Hydrophilic properties were evaluated by water contact angle measurements. While, for the assessment of mechanical properties, flexural strength was measured by the three-point bending test. In the coat(+)light(+) samples the CFU were markedly decreased compared to the control samples. Water contact angle of the coat(+)light(+) samples was decreased after irradiation. The flexural strength of the specimen irradiated for long time showed a higher value than the required standard value, indicating that the effect of irradiation was weak. We suggest that coating with the ultraviolet responsive photocatalyst TiO2 is useful for the development of orthodontic resin with antimicrobial properties.

ACS Style

Akira Kuroiwa; Yoshiaki Nomura; Tsuyoshi Ochiai; Tomomi Sudo; Rie Nomoto; Tohru Hayakawa; Hiroyuki Kanzaki; Yoshiki Nakamura; Nobuhiro Hanada. Antibacterial, Hydrophilic Effect and Mechanical Properties of Orthodontic Resin Coated with UV-Responsive Photocatalyst. Materials 2018, 11, 889 .

AMA Style

Akira Kuroiwa, Yoshiaki Nomura, Tsuyoshi Ochiai, Tomomi Sudo, Rie Nomoto, Tohru Hayakawa, Hiroyuki Kanzaki, Yoshiki Nakamura, Nobuhiro Hanada. Antibacterial, Hydrophilic Effect and Mechanical Properties of Orthodontic Resin Coated with UV-Responsive Photocatalyst. Materials. 2018; 11 (6):889.

Chicago/Turabian Style

Akira Kuroiwa; Yoshiaki Nomura; Tsuyoshi Ochiai; Tomomi Sudo; Rie Nomoto; Tohru Hayakawa; Hiroyuki Kanzaki; Yoshiki Nakamura; Nobuhiro Hanada. 2018. "Antibacterial, Hydrophilic Effect and Mechanical Properties of Orthodontic Resin Coated with UV-Responsive Photocatalyst." Materials 11, no. 6: 889.

Rapid communication
Published: 05 February 2018 in Chemistry Letters
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Dye-sensitized solar cells (DSSCs) were fabricated with immobilized Rhodamine B isothiocyanate (RB-ITC) on TiO2 as energy relay dye (ERD), by reaction of the isothiocyanate group of RB-ITC and the amino group of 6-aminohexanoic acid (6AHA) adsorbed on TiO2. The resulting DSSCs showed improved performance in the spectral range of 450–600 nm and the power conversion efficiency via Förster resonant energy transfer (FRET).

ACS Style

Yuya Takekuma; Tsuyoshi Ochiai; Morio Nagata. Immobilization of Rhodamine B Isothiocyanate on TiO2 for Light Harvesting in Zinc Phthalocyanine Dye-sensitized Solar Cells. Chemistry Letters 2018, 47, 225 -227.

AMA Style

Yuya Takekuma, Tsuyoshi Ochiai, Morio Nagata. Immobilization of Rhodamine B Isothiocyanate on TiO2 for Light Harvesting in Zinc Phthalocyanine Dye-sensitized Solar Cells. Chemistry Letters. 2018; 47 (2):225-227.

Chicago/Turabian Style

Yuya Takekuma; Tsuyoshi Ochiai; Morio Nagata. 2018. "Immobilization of Rhodamine B Isothiocyanate on TiO2 for Light Harvesting in Zinc Phthalocyanine Dye-sensitized Solar Cells." Chemistry Letters 47, no. 2: 225-227.

Journal article
Published: 01 January 2018 in International Journal of Hydrogen Energy
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In this work, CdS/SiC/TiO2 tri-composite photocatalysts that exploit electron- and hole-transfer processes were fabricated using an easy two-step method in the liquid phase. The photocatalyst with a 1:1:1 M ratio of CdS/SiC/TiO2 exhibited a rate of hydrogen evolution from an aqueous solution of sodium sulfite and sodium sulfide under visible light of 137 μmol h−1 g−1, which is 9.5 times that of pure CdS. β-SiC can act as a sink for the photogenerated holes because the valence band level of β-SiC is higher than the corresponding bands in CdS and TiO2. In addition, the level of the conduction band of TiO2 is lower than those of CdS and β-SiC, so TiO2 can act as the acceptor of the photogenerated electrons. Our results demonstrate that hole transfer and absorption in the visible light region lead to an effective hydrogen-production scheme.

ACS Style

Haruki Nagakawa; Tsuyoshi Ochiai; Morio Nagata. Fabrication of CdS/β-SiC/TiO2 tri-composites that exploit hole- and electron-transfer processes for photocatalytic hydrogen production under visible light. International Journal of Hydrogen Energy 2018, 43, 2207 -2211.

AMA Style

Haruki Nagakawa, Tsuyoshi Ochiai, Morio Nagata. Fabrication of CdS/β-SiC/TiO2 tri-composites that exploit hole- and electron-transfer processes for photocatalytic hydrogen production under visible light. International Journal of Hydrogen Energy. 2018; 43 (4):2207-2211.

Chicago/Turabian Style

Haruki Nagakawa; Tsuyoshi Ochiai; Morio Nagata. 2018. "Fabrication of CdS/β-SiC/TiO2 tri-composites that exploit hole- and electron-transfer processes for photocatalytic hydrogen production under visible light." International Journal of Hydrogen Energy 43, no. 4: 2207-2211.

Journal article
Published: 01 November 2017 in Nanoscience and Nanotechnology Letters
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ACS Style

Ryosuke Tamura; Tsuyoshi Ochiai; Daisuke Aoki; Hidenori Saito; Morio Nagata. Comparison of Photocatalytic Activities of Cu/TiO2 and Ag/TiO2 in Gaseous- and Liquid-Phases Degradation of H2S. Nanoscience and Nanotechnology Letters 2017, 9, 1696 -1699.

AMA Style

Ryosuke Tamura, Tsuyoshi Ochiai, Daisuke Aoki, Hidenori Saito, Morio Nagata. Comparison of Photocatalytic Activities of Cu/TiO2 and Ag/TiO2 in Gaseous- and Liquid-Phases Degradation of H2S. Nanoscience and Nanotechnology Letters. 2017; 9 (11):1696-1699.

Chicago/Turabian Style

Ryosuke Tamura; Tsuyoshi Ochiai; Daisuke Aoki; Hidenori Saito; Morio Nagata. 2017. "Comparison of Photocatalytic Activities of Cu/TiO2 and Ag/TiO2 in Gaseous- and Liquid-Phases Degradation of H2S." Nanoscience and Nanotechnology Letters 9, no. 11: 1696-1699.

Technical note
Published: 15 July 2017 in Sensors
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Detecting the bio-potential changes of plants would be useful for monitoring their growth and health in the field. A sensitive plant monitoring system with flexible boron-doped diamond (BDD) electrodes prepared from BDD powder and resin (Nafion or Vylon-KE1830) was investigated. The properties of the electrodes were compared with those of small BDD plate-type electrodes by monitoring the bioelectric potentials of potted Aloe and hybrid species in the genus Opuntia. While flexible BDD electrodes have wide potential windows, their cyclic voltammograms are different from those of the BDD plate. Further, the potential gap between a pair of electrodes attached to the plants changes as the plants are stimulated artificially with a finger touch, suggesting that the bioelectric potentials in the plant also changed, manifesting as changes in the potential gap between the electrodes. The BDD electrodes were assessed for their response reproducibility to a finger stimulus for 30 days. It was concluded that the plant monitoring system worked well with flexible BDD electrodes. Further, the electrodes were stable, and as reliable as the BDD plate electrodes in this study. Thus, a flexible and inexpensive BDD electrode system was successfully fabricated for monitoring the bioelectric potential changes in plants.

ACS Style

Shoko Tago; Tsuyoshi Ochiai; Seitaro Suzuki; Mio Hayashi; Takeshi Kondo; Akira Fujishima. Flexible Boron-Doped Diamond (BDD) Electrodes for Plant Monitoring. Sensors 2017, 17, 1638 .

AMA Style

Shoko Tago, Tsuyoshi Ochiai, Seitaro Suzuki, Mio Hayashi, Takeshi Kondo, Akira Fujishima. Flexible Boron-Doped Diamond (BDD) Electrodes for Plant Monitoring. Sensors. 2017; 17 (7):1638.

Chicago/Turabian Style

Shoko Tago; Tsuyoshi Ochiai; Seitaro Suzuki; Mio Hayashi; Takeshi Kondo; Akira Fujishima. 2017. "Flexible Boron-Doped Diamond (BDD) Electrodes for Plant Monitoring." Sensors 17, no. 7: 1638.