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Chiaki Terashima
Photocatalysis International Research Center (PIRC), Tokyo University of Science, Yamazaki, Noda 278-8510, Chiba, Japan

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Journal article
Published: 27 June 2021 in Journal of Hazardous Materials
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Catalytic reduction of nitroaromatic compounds present in wastewater by nanostructured materials is a promising process for wastewater treatment. A multifunctional electrode based on ternary spinal nickel cobalt oxide is used in the catalytic reduction of a nitroaromatic compound and supercapacitor application. In this study, we designed nanoflakes- like nickel cobaltite (NiCo2O4) using a simple, chemical, cost-effective hydrothermal method. Nanoflakes- like NiCo2O4 samples are tested as catalysts toward rapid reduction of 4-nitrophenol and as electrode materials for supercapacitors. The conversion of 4-nitrophenol into 4-aminophenol is achieved using a reducing agents like sodium borohydride and NiCo2O4 catalyst. Effect of catalyst loading, 4-nitrophenol and sodium borohydride concentrations on the catalytic performance of 4-nitrophenol is studied. As sodium borohydride concentration increases the catalytic efficiency of 4-nitrophenol increased due to more BH4- ions available which provides more electrons for catalytic reduction of 4-nitrophenol. Catalytic reduction of 4-nitrophenol using sodium borohydride as a reducing agent was based on the Langmuir–Hinshelwood mechanism. This mechanism follows the apparent pseudo first order reaction kinetics. Additionally, NiCo2O4 electrode is used for energy storage application. The nanoflakes-like NiCo2O4 electrode deposited at 120 °C shows a higher specific capacitance than samples synthesized at 100 and 140 °C. The maximum specific capacitance observed for NiCo2O4 electrode is 1505 Fg−1 at a scan rate of 5 mV s−1 with high stability of 95% for 5000 CV cycles.

ACS Style

Y.M. Hunge; A.A. Yadav; Seok-Won Kang; Hyunmin Kim; Akira Fujishima; Chiaki Terashima. Nanoflakes-like nickel cobaltite as active electrode material for 4-nitrophenol reduction and supercapacitor applications. Journal of Hazardous Materials 2021, 419, 126453 .

AMA Style

Y.M. Hunge, A.A. Yadav, Seok-Won Kang, Hyunmin Kim, Akira Fujishima, Chiaki Terashima. Nanoflakes-like nickel cobaltite as active electrode material for 4-nitrophenol reduction and supercapacitor applications. Journal of Hazardous Materials. 2021; 419 ():126453.

Chicago/Turabian Style

Y.M. Hunge; A.A. Yadav; Seok-Won Kang; Hyunmin Kim; Akira Fujishima; Chiaki Terashima. 2021. "Nanoflakes-like nickel cobaltite as active electrode material for 4-nitrophenol reduction and supercapacitor applications." Journal of Hazardous Materials 419, no. : 126453.

Journal article
Published: 01 April 2021 in Catalysts
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In this research work, we reported the synthesis of a spherical-shaped bismuth vanadate (BiVO4) photocatalyst using a cost-effective, simple, chemical hydrothermal method and studied the effect of deposition temperatures on the structural, morphological, optical properties, etc. The XRD result confirmed the monoclinic scheelite phase of BiVO4. An XPS study confirmed the occurrence of Bi, V, and O elements and also found that Bi and V exist in +3 and +5 oxidation states, respectively. SEM micrographs revealed the spherical-shaped morphology of the BiVO4 photocatalyst. Optical investigation showed that the bandgap of the BiVO4 photocatalyst varied between 2.25 and 2.32 eV. The as-synthesized BiVO4 photocatalyst was used to study the photocatalytic degradation of crystal violet (CV) dye under visible light illumination. The photocatalytic degradation experiment showed that the degradation percentage of crystal violet dye using BiVO4 reached 98.21% after 120 min. Mineralization of crystal violet dye was studied using a chemical oxygen demand analysis.

ACS Style

Yuvaraj Hunge; Akihiro Uchida; Yusuke Tominaga; Yuta Fujii; Anuja Yadav; Seok-Won Kang; Norihiro Suzuki; Isao Shitanda; Takeshi Kondo; Masayuki Itagaki; Makoto Yuasa; Suresh Gosavi; Akira Fujishima; Chiaki Terashima. Visible Light-Assisted Photocatalysis Using Spherical-Shaped BiVO4 Photocatalyst. Catalysts 2021, 11, 460 .

AMA Style

Yuvaraj Hunge, Akihiro Uchida, Yusuke Tominaga, Yuta Fujii, Anuja Yadav, Seok-Won Kang, Norihiro Suzuki, Isao Shitanda, Takeshi Kondo, Masayuki Itagaki, Makoto Yuasa, Suresh Gosavi, Akira Fujishima, Chiaki Terashima. Visible Light-Assisted Photocatalysis Using Spherical-Shaped BiVO4 Photocatalyst. Catalysts. 2021; 11 (4):460.

Chicago/Turabian Style

Yuvaraj Hunge; Akihiro Uchida; Yusuke Tominaga; Yuta Fujii; Anuja Yadav; Seok-Won Kang; Norihiro Suzuki; Isao Shitanda; Takeshi Kondo; Masayuki Itagaki; Makoto Yuasa; Suresh Gosavi; Akira Fujishima; Chiaki Terashima. 2021. "Visible Light-Assisted Photocatalysis Using Spherical-Shaped BiVO4 Photocatalyst." Catalysts 11, no. 4: 460.

Review
Published: 26 March 2021 in Catalysts
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Semiconductor-based photocatalysis has been identified as an encouraging approach for solving the two main challenging problems, viz., remedying our polluted environment and the generation of sustainable chemical energy. Stoichiometric and non-stoichiometric bismuth oxyhalides (BiOX and BixOyXz where X = Cl, Br, and I) are a relatively new class of semiconductors that have attracted considerable interest for photocatalysis applications due to attributes, viz., high stability, suitable band structure, modifiable energy bandgap and two-dimensional layered structure capable of generating an internal electric field. Recently, the construction of heterojunction photocatalysts, especially 2D/2D systems, has convincingly drawn momentous attention practicably owing to the productive influence of having two dissimilar layered semiconductors in face-to-face contact with each other. This review has systematically summarized the recent progress on the 2D/2D heterojunction constructed between BiOX/BixOyXz with graphitic carbon nitride (g-C3N4). The band structure of individual components, various fabrication methods, different strategies developed for improving the photocatalytic performance and their applications in the degradation of various organic contaminants, hydrogen (H2) evolution, carbon dioxide (CO2) reduction, nitrogen (N2) fixation and the organic synthesis of clean chemicals are summarized. The perspectives and plausible opportunities for developing high performance BiOX/BixOyXz-g-C3N4 heterojunction photocatalysts are also discussed.

ACS Style

Kishore Sridharan; Sulakshana Shenoy; S. Kumar; Chiaki Terashima; Akira Fujishima; Sudhagar Pitchaimuthu. Advanced Two-Dimensional Heterojunction Photocatalysts of Stoichiometric and Non-Stoichiometric Bismuth Oxyhalides with Graphitic Carbon Nitride for Sustainable Energy and Environmental Applications. Catalysts 2021, 11, 426 .

AMA Style

Kishore Sridharan, Sulakshana Shenoy, S. Kumar, Chiaki Terashima, Akira Fujishima, Sudhagar Pitchaimuthu. Advanced Two-Dimensional Heterojunction Photocatalysts of Stoichiometric and Non-Stoichiometric Bismuth Oxyhalides with Graphitic Carbon Nitride for Sustainable Energy and Environmental Applications. Catalysts. 2021; 11 (4):426.

Chicago/Turabian Style

Kishore Sridharan; Sulakshana Shenoy; S. Kumar; Chiaki Terashima; Akira Fujishima; Sudhagar Pitchaimuthu. 2021. "Advanced Two-Dimensional Heterojunction Photocatalysts of Stoichiometric and Non-Stoichiometric Bismuth Oxyhalides with Graphitic Carbon Nitride for Sustainable Energy and Environmental Applications." Catalysts 11, no. 4: 426.

Journal article
Published: 20 February 2021 in Chemosphere
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Photoactive materials hold structural and catalytic features that make them particularly suitable for environmental applications and in the present work, protonated H3Ti3O7–Y nanofiber-like materials were prepared via the microwave assisted hydrothermal technique. The as-prepared nanofibers exhibited high surface area with titanate structure. The nanofibers, before and after yttrium incorporation, were well-distributed and the fibrous morphology could be observed clearly; as the yttrium loading increased, ribbons and the anatase phase were formed. Practical films of these nanofibers confirmed their likely UV-photoactive properties with 200 ppm of acetaldehyde degradation within 25 min in the presence of 50% of humidity. Activity retention was achieved, keeping stability for 2 consecutive cycles at room temperature. Nowadays, the increase in home office work sets human health at risk, for the exposure to toxic volatile organic compounds and microorganisms such as viruses and bacteria is more frequent indoors. In this context, the synthesized photoactive yttrium-titanate films stand as upcoming practical UV-driven materials for cleaning pollution that concentrated urban activity and indoor environments.

ACS Style

Vicente Rodríguez-González; Mao Sasaki; Junki Ishii; Sovann Khan; Chiaki Terashima; Norihiro Suzuki; Akira Fujishima. Indoor gas phase photoactivity of yttrium modified titanate films for fast acetaldehyde oxidation. Chemosphere 2021, 275, 129992 .

AMA Style

Vicente Rodríguez-González, Mao Sasaki, Junki Ishii, Sovann Khan, Chiaki Terashima, Norihiro Suzuki, Akira Fujishima. Indoor gas phase photoactivity of yttrium modified titanate films for fast acetaldehyde oxidation. Chemosphere. 2021; 275 ():129992.

Chicago/Turabian Style

Vicente Rodríguez-González; Mao Sasaki; Junki Ishii; Sovann Khan; Chiaki Terashima; Norihiro Suzuki; Akira Fujishima. 2021. "Indoor gas phase photoactivity of yttrium modified titanate films for fast acetaldehyde oxidation." Chemosphere 275, no. : 129992.

Research article
Published: 16 February 2021 in ACS Omega
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Herein, overall improvement in the electrochemical performance of manganese dioxide is achieved through fine-tuning the microstructure of partially Co-doped manganese dioxide nanomaterial using facile hydrothermal method with precise control of preparative parameters. The structural investigation exhibits formation of a multiphase compound accompanied by controlled reflections of α-MnO2 as well as γ-MnO2 crystalline phases. The morphological examination manifests the presence of MnO2 nanowires having a width of 70–80 nm and a length of several microns. The Co-doped manganese dioxide electrode displayed a particular capacitive behavior along with a rising order of capacitance concerning with increased cobalt ion concentration suitable for certain limits. The value of specific capacitance achieved by a 5% Co-doped manganese dioxide sample was 1050 F g–1 at 0.5 A g–1, which was nearly threefold greater than that achieved by a bare manganese dioxide electrode. Furthermore, Co-doped manganese dioxide nanocomposite electrode exhibits exceptional capacitance retention (92.7%) till 10,000 cycles. It shows the good cyclability as well as stability of the material. Furthermore, we have demonstrated the solid-state supercapacitor with good energy and power density.

ACS Style

Sarika M. Jadhav; Ramchandra S. Kalubarme; Norihiro Suzuki; Chiaki Terashima; Junyoung Mun; Bharat Bhanudas Kale; Suresh W. Gosavi; Akira Fujishima. Cobalt-Doped Manganese Dioxide Hierarchical Nanostructures for Enhancing Pseudocapacitive Properties. ACS Omega 2021, 6, 5717 -5729.

AMA Style

Sarika M. Jadhav, Ramchandra S. Kalubarme, Norihiro Suzuki, Chiaki Terashima, Junyoung Mun, Bharat Bhanudas Kale, Suresh W. Gosavi, Akira Fujishima. Cobalt-Doped Manganese Dioxide Hierarchical Nanostructures for Enhancing Pseudocapacitive Properties. ACS Omega. 2021; 6 (8):5717-5729.

Chicago/Turabian Style

Sarika M. Jadhav; Ramchandra S. Kalubarme; Norihiro Suzuki; Chiaki Terashima; Junyoung Mun; Bharat Bhanudas Kale; Suresh W. Gosavi; Akira Fujishima. 2021. "Cobalt-Doped Manganese Dioxide Hierarchical Nanostructures for Enhancing Pseudocapacitive Properties." ACS Omega 6, no. 8: 5717-5729.

Journal article
Published: 08 February 2021 in Catalysts
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In recent years, direct synthesis of dimethyl carbonate (DMC) from carbon dioxide (CO2) has received considerable attention due to green and sustainable technology. Here, we report a production of DMC from major greenhouse gases and CO2 using various morphologies of cerium oxide (CeO2). Time-dependent synthesis of CeO2, with controlled morphology having various shapes including sphere, nanorods and spindle shape, along with its formation mechanism is proposed. The experimental results indicate the morphology of CeO2 was mostly dependent on the reaction time where crystal growth occurred through Ostwald ripening. The morphology, size and shape of CeO2 were observed using transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM).The crystallographic analysis using X-ray diffraction (XRD) shows cubic fluorite phase of CeO2 with crystallite size ~72.0 nm using the Debye–Scherrer equation. The nitrogen adsorption desorption technique suggested the formation of the highly mesoporous framework of CeO2 and the excellent surface area around 104.5 m2/g obtained for CeO2 spindles by Brunauer–Emmett–Teller (BET) method. The DMC synthesis reactions were studied over CeO2 catalyst with different morphologies. The results of catalytic reactions specify that the morphology of catalyst plays an important role in their catalytic performances, where spindle shape CeO2 was the most active catalyst producing of up to13.04 mmol of DMC. Furthermore, various dehydrating agents were used to improve the DMC production at optimized reaction parameters. The overall results reveal that the higher surface area and spindle shape of CeO2 makes it a useful, reusable catalyst for one-pot DMC synthesis.

ACS Style

Ashif Tamboli; Norihiro Suzuki; Chiaki Terashima; Suresh Gosavi; Hern Kim; Akira Fujishima. Direct Dimethyl Carbonates Synthesis over CeO2 and Evaluation of Catalyst Morphology Role in Catalytic Performance. Catalysts 2021, 11, 223 .

AMA Style

Ashif Tamboli, Norihiro Suzuki, Chiaki Terashima, Suresh Gosavi, Hern Kim, Akira Fujishima. Direct Dimethyl Carbonates Synthesis over CeO2 and Evaluation of Catalyst Morphology Role in Catalytic Performance. Catalysts. 2021; 11 (2):223.

Chicago/Turabian Style

Ashif Tamboli; Norihiro Suzuki; Chiaki Terashima; Suresh Gosavi; Hern Kim; Akira Fujishima. 2021. "Direct Dimethyl Carbonates Synthesis over CeO2 and Evaluation of Catalyst Morphology Role in Catalytic Performance." Catalysts 11, no. 2: 223.

Journal article
Published: 11 January 2021 in Catalysts
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Titanium dioxide (TiO2) has been widely used as a catalyst material in different applications such as photocatalysis, solar cells, supercapacitor, and hydrogen production, due to its better chemical stability, high redox potential, wide band gap, and eco-friendly nature. In this work TiO2 thin films have been deposited onto both glass and silicon substrates by the atmospheric pressure plasma jet (APPJ) technique. The structure and morphological properties of TiO2 thin films are studied using different characterization techniques like X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and field emission scanning electron microscopy. XRD study reveals the bronze-phase of TiO2. The XPS study shows the presence of Ti, O, C, and N elements. The FE-SEM study shows the substrate surface is well covered with a nearly round shaped grain of different size. The optical study shows that all the deposited TiO2 thin films exhibit strong absorption in the ultraviolet region. The oleic acid photocatalytic decomposition study demonstrates that the water contact angle decreased from 80.22 to 27.20° under ultraviolet illumination using a TiO2 photocatalyst.

ACS Style

Suresh Gosavi; Rena Tabei; Nitish Roy; Sanjay S. Latthe; Yuvaraj M. Hunge; Norihiro Suzuki; Takeshi Kondo; Makoto Yuasa; Katsuya Teshima; Akira Fujishima; Chiaki Terashima. Low Temperature Deposition of TiO2 Thin Films through Atmospheric Pressure Plasma Jet Processing. Catalysts 2021, 11, 91 .

AMA Style

Suresh Gosavi, Rena Tabei, Nitish Roy, Sanjay S. Latthe, Yuvaraj M. Hunge, Norihiro Suzuki, Takeshi Kondo, Makoto Yuasa, Katsuya Teshima, Akira Fujishima, Chiaki Terashima. Low Temperature Deposition of TiO2 Thin Films through Atmospheric Pressure Plasma Jet Processing. Catalysts. 2021; 11 (1):91.

Chicago/Turabian Style

Suresh Gosavi; Rena Tabei; Nitish Roy; Sanjay S. Latthe; Yuvaraj M. Hunge; Norihiro Suzuki; Takeshi Kondo; Makoto Yuasa; Katsuya Teshima; Akira Fujishima; Chiaki Terashima. 2021. "Low Temperature Deposition of TiO2 Thin Films through Atmospheric Pressure Plasma Jet Processing." Catalysts 11, no. 1: 91.

Research article
Published: 19 November 2020 in Nano Research
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Efficient light absorption and trapping are of vital importance for the solar water evaporation by hydrogel-based photothermal conversion materials. Conventional strategies are focused on the development of the composition and structure of the hydrogel's internal network. In our point of view, the importance of the surface structure of hydrogel has usually been underestimated or ignored. Here inspired by the excellent absorbance and water transportation ability of biological surface structure, the hierarchical structured hydrogel evaporators (HSEs) increased the light absorption, trapping, water transportation and water-air interface, which is the beneficial photothermal conversion and water evaporation. The HSEs showed a rapid evaporation rate of 1.77 kg·m-2·h-1 at about 92% energy efficiency under one sun (1 kW·m-2). Furthermore, the superhydrophilic window device was used in this work to collect the condensed water, which avoids the light-blocking caused by the water mist formed by the small droplets and the problem of the droplets stick on the device dropping back to the bulk water. Integrated with the excellent photothermal conversion hydrogel and superhydrophilic window equipment, this work provides efficient evaporation and desalination of hydrogel-based solar evaporators in practical large-scale applications.

ACS Style

Wenwei Lei; Sovann Khan; Lie Chen; Norihiro Suzuki; Chiaki Terashima; Kesong Liu; Akira Fujishima; Mingjie Liu. Hierarchical structures hydrogel evaporator and superhydrophilic water collect device for efficient solar steam evaporation. Nano Research 2020, 14, 1135 -1140.

AMA Style

Wenwei Lei, Sovann Khan, Lie Chen, Norihiro Suzuki, Chiaki Terashima, Kesong Liu, Akira Fujishima, Mingjie Liu. Hierarchical structures hydrogel evaporator and superhydrophilic water collect device for efficient solar steam evaporation. Nano Research. 2020; 14 (4):1135-1140.

Chicago/Turabian Style

Wenwei Lei; Sovann Khan; Lie Chen; Norihiro Suzuki; Chiaki Terashima; Kesong Liu; Akira Fujishima; Mingjie Liu. 2020. "Hierarchical structures hydrogel evaporator and superhydrophilic water collect device for efficient solar steam evaporation." Nano Research 14, no. 4: 1135-1140.

Research article
Published: 31 August 2020 in ACS Omega
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We have prepared yttrium (Y)-doped hydrogen titanate nanorods (HTN) by a microwave-assisted hydrothermal method. Y-doped HTN showed much improved photocatalytic activities for both H2 evolution and dye decomposition. H2 production from a methanol–water solution under UV–visible light for 7 h was enhanced by a factor of 5.5 with 1 wt % Y-doping. Doping with Y3+ ions reduced the band gap of HTN by ∼0.28 eV and induced new phases of anatase and rutile. High photocatalysis by Y-doping was attributed to enhanced light absorption (smaller band gap) and effective charge separation (heterojunction). To optimize H2 production, a series of experiments examining effects of doping concentrations and non-noble surface metal (e.g., Ni, Cu, Co) loading were carefully performed. Y-doping in this work is a new and promising approach for synthesizing highly active HTN by producing the HTN/rutile/anatase heterostructure within the one-pot method.

ACS Style

Sovann Khan; Hiroshi Ikari; Norihiro Suzuki; Kazuya Nakata; Chiaki Terashima; Akira Fujishima; Ken-Ichi Katsumata; Vicente Rodríguez-González. One-Pot Synthesis of Anatase, Rutile-Decorated Hydrogen Titanate Nanorods by Yttrium Doping for Solar H2 Production. ACS Omega 2020, 5, 23081 -23089.

AMA Style

Sovann Khan, Hiroshi Ikari, Norihiro Suzuki, Kazuya Nakata, Chiaki Terashima, Akira Fujishima, Ken-Ichi Katsumata, Vicente Rodríguez-González. One-Pot Synthesis of Anatase, Rutile-Decorated Hydrogen Titanate Nanorods by Yttrium Doping for Solar H2 Production. ACS Omega. 2020; 5 (36):23081-23089.

Chicago/Turabian Style

Sovann Khan; Hiroshi Ikari; Norihiro Suzuki; Kazuya Nakata; Chiaki Terashima; Akira Fujishima; Ken-Ichi Katsumata; Vicente Rodríguez-González. 2020. "One-Pot Synthesis of Anatase, Rutile-Decorated Hydrogen Titanate Nanorods by Yttrium Doping for Solar H2 Production." ACS Omega 5, no. 36: 23081-23089.

Journal article
Published: 29 August 2020 in Journal of Colloid and Interface Science
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Different types of organic impurities such as dyes, acids, and alcohols are discharged into potable water sources. The removal of these hazardous organic pollutants from wastewater is an important task globally. However, the conventional methods used to remove organic impurities suffer from low efficiency and recycling problems. Photocatalysis is a promising advanced oxidation process for the degradation of organic compounds in aqueous solution. Titanium dioxide (TiO2) is commonly used as a photocatalyst. However, the wide bandgap of TiO2 means that it is activated by ultraviolet light, which restrains its ability to harvest solar energy. In this study, a simple water-based precipitation method was used to synthesize [email protected] composites. The ability of the composites to degrade bisphenol A as a model organic pollutant was investigated. It was found that 10 ppm of bisphenol A was completely degraded in 100 min by the [email protected] photocatalyst under ultraviolet illumination.

ACS Style

Y.M. Hunge; A.A. Yadav; Sovann Khan; Kai Takagi; Norihiro Suzuki; Katsuya Teshima; Chiaki Terashima; Akira Fujishima. Photocatalytic degradation of bisphenol A using titanium [email protected] composites under UV light illumination. Journal of Colloid and Interface Science 2020, 582, 1058 -1066.

AMA Style

Y.M. Hunge, A.A. Yadav, Sovann Khan, Kai Takagi, Norihiro Suzuki, Katsuya Teshima, Chiaki Terashima, Akira Fujishima. Photocatalytic degradation of bisphenol A using titanium [email protected] composites under UV light illumination. Journal of Colloid and Interface Science. 2020; 582 ():1058-1066.

Chicago/Turabian Style

Y.M. Hunge; A.A. Yadav; Sovann Khan; Kai Takagi; Norihiro Suzuki; Katsuya Teshima; Chiaki Terashima; Akira Fujishima. 2020. "Photocatalytic degradation of bisphenol A using titanium [email protected] composites under UV light illumination." Journal of Colloid and Interface Science 582, no. : 1058-1066.

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.

Journal article
Published: 03 September 2019 in ACS Applied Nano Materials
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Monoclinic ZrO2 with a nanosheet structure has been successfully synthesized via the thermal transformation of NH4Zr2F9 using a high-temperature ionothermal synthesis. The samples were characterized using X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, atomic force microscopy, and conductivity measurements with a multi-probe. The result indicates that the as-prepared samples have a single crystal sheet structure with a thickness of 4 nm. To the best of our knowledge, a thin film of single crystal monoclinic ZrO2 has not been reported, even though ZrO2 is an important material. In the absence of the ionic liquid (butyl-2,3-dimethylimidazolium tetrafluoroborate), the thermal transformation of NH4Zr2F9 produced porosity within the two-dimensional structure, whereas in the presence of the ionic liquid, the homogeneous sheet structure was maintained without porosity. The decomposition temperature of the ionic liquid and transformation temperature of NH4Zr2F9 were analyzed to investigate the thermal transformation process; the thermal transformation was completed before combustion of the ionic liquid. Current vs. voltage curve of a ZrO2 nanosheet indicates high resistivity and breakdown voltage (ca. 20 V), which are attributable to the single crystal structure without grain boundaries. The ZrO2 is utilized for solid oxide fuel cell and oxygen sensor, therefore, the single crystal nanosheet with high resistivity is expected to be applied to these fields. CeO2 single crystallized nanosheets were also obtained by the proposed thermal transformation method in an ionic liquid. The synthetic routes to obtain nanosheets are limited; however, the proposed method has the potential to expand the number of routes and enable the synthesis of nanosheet materials.

ACS Style

Tetsuya Yamada; Yuta Kubota; Yuki Makinose; Norihiro Suzuki; Kazuya Nakata; Chiaki Terashima; Nobuhiro Matsushita; Kiyoshi Okada; Akira Fujishima; Ken-Ichi Katsumata. Single Crystal ZrO2 Nanosheets Formed by Thermal Transformation for Solid Oxide Fuel Cells and Oxygen Sensors. ACS Applied Nano Materials 2019, 2, 6866 -6873.

AMA Style

Tetsuya Yamada, Yuta Kubota, Yuki Makinose, Norihiro Suzuki, Kazuya Nakata, Chiaki Terashima, Nobuhiro Matsushita, Kiyoshi Okada, Akira Fujishima, Ken-Ichi Katsumata. Single Crystal ZrO2 Nanosheets Formed by Thermal Transformation for Solid Oxide Fuel Cells and Oxygen Sensors. ACS Applied Nano Materials. 2019; 2 (11):6866-6873.

Chicago/Turabian Style

Tetsuya Yamada; Yuta Kubota; Yuki Makinose; Norihiro Suzuki; Kazuya Nakata; Chiaki Terashima; Nobuhiro Matsushita; Kiyoshi Okada; Akira Fujishima; Ken-Ichi Katsumata. 2019. "Single Crystal ZrO2 Nanosheets Formed by Thermal Transformation for Solid Oxide Fuel Cells and Oxygen Sensors." ACS Applied Nano Materials 2, no. 11: 6866-6873.

Journal article
Published: 15 January 2019 in Bulletin of the Chemical Society of Japan
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ACS Style

Nitish Roy; Norihiro Suzuki; Chiaki Terashima; Akira Fujishima. Recent Improvements in the Production of Solar Fuels: From CO2 Reduction to Water Splitting and Artificial Photosynthesis. Bulletin of the Chemical Society of Japan 2019, 92, 178 -192.

AMA Style

Nitish Roy, Norihiro Suzuki, Chiaki Terashima, Akira Fujishima. Recent Improvements in the Production of Solar Fuels: From CO2 Reduction to Water Splitting and Artificial Photosynthesis. Bulletin of the Chemical Society of Japan. 2019; 92 (1):178-192.

Chicago/Turabian Style

Nitish Roy; Norihiro Suzuki; Chiaki Terashima; Akira Fujishima. 2019. "Recent Improvements in the Production of Solar Fuels: From CO2 Reduction to Water Splitting and Artificial Photosynthesis." Bulletin of the Chemical Society of Japan 92, no. 1: 178-192.

Short communication
Published: 13 December 2018 in Materials Letters
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In this report, we demonstrate the advantage of Jatropha curcas plant extract as particle reducing agent in stabilizing cerium oxide (CeO2) nanoparticles. The toxic-free, green Jatropha curcas extract mediated CeO2 nanoparticles has tested in photocatalytic degradation of indoor gaseous pollutant acetaldehyde and compared with conventional chemically synthesized CeO2 nanoparticles (NH3 and NaOH). The results showed green synthesized CeO2 nanoparticles are effectively reducing the particle size 3–5 nm and homogenous particle distribution compared to chemically synthesized CeO2 (18–25 nm). As a result, it exhibits effective photocatalysis performance in acetaldehyde degradation.

ACS Style

R. Magudieshwaran; Junki Ishii; Krishna Chandar Nagamuthu Raja; Chiaki Terashima; R. Venkatachalam; Akira Fujishima; Sudhagar Pitchaimuthu. Green and chemical synthesized CeO2 nanoparticles for photocatalytic indoor air pollutant degradation. Materials Letters 2018, 239, 40 -44.

AMA Style

R. Magudieshwaran, Junki Ishii, Krishna Chandar Nagamuthu Raja, Chiaki Terashima, R. Venkatachalam, Akira Fujishima, Sudhagar Pitchaimuthu. Green and chemical synthesized CeO2 nanoparticles for photocatalytic indoor air pollutant degradation. Materials Letters. 2018; 239 ():40-44.

Chicago/Turabian Style

R. Magudieshwaran; Junki Ishii; Krishna Chandar Nagamuthu Raja; Chiaki Terashima; R. Venkatachalam; Akira Fujishima; Sudhagar Pitchaimuthu. 2018. "Green and chemical synthesized CeO2 nanoparticles for photocatalytic indoor air pollutant degradation." Materials Letters 239, no. : 40-44.

Journal article
Published: 27 November 2018 in Molecules
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There is a need for highly efficient photocatalysts, particularly for water purification. In this study, we fabricated a mesoporous TiO2 thin film on a boron-doped diamond (BDD) layer by a surfactant-assisted sol-gel method, in which self-assembled amphiphilic surfactant micelles were used as an organic template. Scanning electron microscopy revealed uniform mesopores, approximately 20 nm in diameter, that were hexagonally packed in the TiO2 thin film. Wide-angle X-ray diffraction and Raman spectroscopy clarified that the framework crystallized in the anatase phase. Current–voltage (I–V) measurements showed rectification features at the TiO2/BDD heterojunction, confirming that a p–n hetero-interface formed. The as-synthesized mesoporous TiO2/BDD worked well as a photocatalyst, even with a small volume of TiO2 (15 mm × 15 mm × c.a. 1.5 µm in thickness). The use of deep UV light (λ = 222 nm) as a light source was necessary to enhance photocatalytic activity, due to photo-excitation occurring in both BDD and TiO2.

ACS Style

Norihiro Suzuki; Akihiro Okazaki; Haruo Kuriyama; Izumi Serizawa; Aiga Hara; Yuiri Hirano; Yukihiro Nakabayashi; Nitish Roy; Chiaki Terashima; Kazuya Nakata; Ken-Ichi Katsumata; Takeshi Kondo; Makoto Yuasa; Akira Fujishima. Synthesis of Mesoporous TiO2/Boron-Doped Diamond Photocatalyst and Its Photocatalytic Activity under Deep UV Light (λ = 222 nm) Irradiation. Molecules 2018, 23, 3095 .

AMA Style

Norihiro Suzuki, Akihiro Okazaki, Haruo Kuriyama, Izumi Serizawa, Aiga Hara, Yuiri Hirano, Yukihiro Nakabayashi, Nitish Roy, Chiaki Terashima, Kazuya Nakata, Ken-Ichi Katsumata, Takeshi Kondo, Makoto Yuasa, Akira Fujishima. Synthesis of Mesoporous TiO2/Boron-Doped Diamond Photocatalyst and Its Photocatalytic Activity under Deep UV Light (λ = 222 nm) Irradiation. Molecules. 2018; 23 (12):3095.

Chicago/Turabian Style

Norihiro Suzuki; Akihiro Okazaki; Haruo Kuriyama; Izumi Serizawa; Aiga Hara; Yuiri Hirano; Yukihiro Nakabayashi; Nitish Roy; Chiaki Terashima; Kazuya Nakata; Ken-Ichi Katsumata; Takeshi Kondo; Makoto Yuasa; Akira Fujishima. 2018. "Synthesis of Mesoporous TiO2/Boron-Doped Diamond Photocatalyst and Its Photocatalytic Activity under Deep UV Light (λ = 222 nm) Irradiation." Molecules 23, no. 12: 3095.

Cover picture
Published: 12 September 2018 in ChemElectroChem
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Nitish Roy; Norihiro Suzuki; Yukihiro Nakabayashi; Yuiri Hirano; Hiroshi Ikari; Ken-Ichi Katsumata; Kazuya Nakata; Akira Fujishima; Chiaki Terashima. Cover Feature: Facile Deposition of Cu−SnO x Hybrid Nanostructures on Lightly Boron‐Doped Diamond Electrodes for CO 2 Reduction (ChemElectroChem 18/2018). ChemElectroChem 2018, 5, 2504 -2504.

AMA Style

Nitish Roy, Norihiro Suzuki, Yukihiro Nakabayashi, Yuiri Hirano, Hiroshi Ikari, Ken-Ichi Katsumata, Kazuya Nakata, Akira Fujishima, Chiaki Terashima. Cover Feature: Facile Deposition of Cu−SnO x Hybrid Nanostructures on Lightly Boron‐Doped Diamond Electrodes for CO 2 Reduction (ChemElectroChem 18/2018). ChemElectroChem. 2018; 5 (18):2504-2504.

Chicago/Turabian Style

Nitish Roy; Norihiro Suzuki; Yukihiro Nakabayashi; Yuiri Hirano; Hiroshi Ikari; Ken-Ichi Katsumata; Kazuya Nakata; Akira Fujishima; Chiaki Terashima. 2018. "Cover Feature: Facile Deposition of Cu−SnO x Hybrid Nanostructures on Lightly Boron‐Doped Diamond Electrodes for CO 2 Reduction (ChemElectroChem 18/2018)." ChemElectroChem 5, no. 18: 2504-2504.

Journal article
Published: 25 July 2018 in Applied Surface Science
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Photocatalytic TiO2/SiO2 coatings with excellent superhydrophilic wettability were prepared on light-weight polycarbonate substrates for self-cleaning applications. The effect of distinct SiO2 concentrations (0% to 40%) in TiO2 on the morphology, wettability, UV-Vis transmittance, haze, and durability of the coatings was studied in detail. TiO2/SiO2 coatings prepared with 20% silica in TiO2 showed superhydrophilic wetting properties with a smooth and uniform morphology with more than 85% transmittance. The lower haze value of TiO2/SiO2 coatings confirms their clear optical appearance. A low-friction layer of fluoroalkylsilane was applied to the coatings to improve their mechanical durability. In addition, the hydrophobic-hydrophilic patterns of different areas were prepared to check their effect on the haze and wetting properties.

ACS Style

Takahiro Adachi; Sanjay S. Latthe; Suresh W. Gosavi; Nitish Roy; Norihiro Suzuki; Hiroshi Ikari; Kazuki Kato; Ken-Ichi Katsumata; Kazuya Nakata; Manabu Furudate; Tomohiro Inoue; Takeshi Kondo; Makoto Yuasa; Akira Fujishima; Chiaki Terashima. Photocatalytic, superhydrophilic, self-cleaning TiO2 coating on cheap, light-weight, flexible polycarbonate substrates. Applied Surface Science 2018, 458, 917 -923.

AMA Style

Takahiro Adachi, Sanjay S. Latthe, Suresh W. Gosavi, Nitish Roy, Norihiro Suzuki, Hiroshi Ikari, Kazuki Kato, Ken-Ichi Katsumata, Kazuya Nakata, Manabu Furudate, Tomohiro Inoue, Takeshi Kondo, Makoto Yuasa, Akira Fujishima, Chiaki Terashima. Photocatalytic, superhydrophilic, self-cleaning TiO2 coating on cheap, light-weight, flexible polycarbonate substrates. Applied Surface Science. 2018; 458 ():917-923.

Chicago/Turabian Style

Takahiro Adachi; Sanjay S. Latthe; Suresh W. Gosavi; Nitish Roy; Norihiro Suzuki; Hiroshi Ikari; Kazuki Kato; Ken-Ichi Katsumata; Kazuya Nakata; Manabu Furudate; Tomohiro Inoue; Takeshi Kondo; Makoto Yuasa; Akira Fujishima; Chiaki Terashima. 2018. "Photocatalytic, superhydrophilic, self-cleaning TiO2 coating on cheap, light-weight, flexible polycarbonate substrates." Applied Surface Science 458, no. : 917-923.

Article
Published: 19 July 2018 in ChemElectroChem
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In this work, we report a facile synthesis of Cu‐SnOx hybrid nanostructures on the lightly boron‐doped diamond (BDDL) electrodes by a potentiaodynamic electrodeposition method. Deposition potential for Cu‐SnOx hybrid nanostrucures was cycled between 0 to ‐1.0 V vs Ag/AgCl for five consecutive run at a scan rate 50 mV/sec. Cu‐SnOx hybrid nanostructures growth on BDDL was optimised by varying number of potentiaodynamic deposition cycle and precusrosor concentration. A unifrom particle size distribution of Cu‐SnOx was found to obtain on BDDL using 10 mM CuSO4 and 5 mM SnCl2 in 50 mM aquoes NaNO3. Detail of surface morphology and surface elemental composition of the optimized Cu‐SnOx hybrid nanostructures modified BDDL electrodes were characterized. The optimized Cu‐SnOx hybrid nanostructures on BDDL were found to be in the size range 50 to 100 nm with a 3 to 10 nm SnOx‐rich shell. This optimized Cu‐SnOx modified BDDL electrode was tested for electrochemical CO2 reduction reaction in aqueous electrolyte and found to produce primarily CO with a Faradaic Efficiency up to 82.5% at ‐1.6 V vs Ag/AgCl.

ACS Style

Nitish Roy; Norihiro Suzuki; Yukihiro Nakabayashi; Yuiri Hirano; Hiroshi Ikari; Ken‐Ichi Katsumata; Kazuya Nakata; Akira Fujishima; Chiaki Terashima. Facile Deposition of Cu−SnO x Hybrid Nanostructures on Lightly Boron‐Doped Diamond Electrodes for CO 2 Reduction. ChemElectroChem 2018, 5, 2542 -2550.

AMA Style

Nitish Roy, Norihiro Suzuki, Yukihiro Nakabayashi, Yuiri Hirano, Hiroshi Ikari, Ken‐Ichi Katsumata, Kazuya Nakata, Akira Fujishima, Chiaki Terashima. Facile Deposition of Cu−SnO x Hybrid Nanostructures on Lightly Boron‐Doped Diamond Electrodes for CO 2 Reduction. ChemElectroChem. 2018; 5 (18):2542-2550.

Chicago/Turabian Style

Nitish Roy; Norihiro Suzuki; Yukihiro Nakabayashi; Yuiri Hirano; Hiroshi Ikari; Ken‐Ichi Katsumata; Kazuya Nakata; Akira Fujishima; Chiaki Terashima. 2018. "Facile Deposition of Cu−SnO x Hybrid Nanostructures on Lightly Boron‐Doped Diamond Electrodes for CO 2 Reduction." ChemElectroChem 5, no. 18: 2542-2550.

Chapter
Published: 21 June 2018 in A New Generation Material Graphene: Applications in Water Technology
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Developing sustainable and less-expensive technique is always challenging task in water treatment process. This chapter explores the recent development of photocatalysis technique in organic pollutant removal from the water. Particularly, advantages of graphene oxide in promoting the catalytic performance of semiconductor, metal nanoparticle and polymer based photocatalyst materials. Owing to high internal surface area and rapid electron conducting property of graphene oxide fostering as backbone scaffold for effective hetero-photocatalyst loading, and rapid photo-charge separation enables effective degradation of pollutant. This chapter summaries the recent development of graphene oxide composite (metal oxide, metal nanoparticle, metal chalcogenides, and polymers) in semiconductor photocatalysis process towards environmental remediation application.

ACS Style

Suneel Kumar; Chiaki Terashima; Akira Fujishima; Venkata Krishnan; Sudhagar Pitchaimuthu. Photocatalytic Degradation of Organic Pollutants in Water Using Graphene Oxide Composite. A New Generation Material Graphene: Applications in Water Technology 2018, 413 -438.

AMA Style

Suneel Kumar, Chiaki Terashima, Akira Fujishima, Venkata Krishnan, Sudhagar Pitchaimuthu. Photocatalytic Degradation of Organic Pollutants in Water Using Graphene Oxide Composite. A New Generation Material Graphene: Applications in Water Technology. 2018; ():413-438.

Chicago/Turabian Style

Suneel Kumar; Chiaki Terashima; Akira Fujishima; Venkata Krishnan; Sudhagar Pitchaimuthu. 2018. "Photocatalytic Degradation of Organic Pollutants in Water Using Graphene Oxide Composite." A New Generation Material Graphene: Applications in Water Technology , no. : 413-438.

Journal article
Published: 01 May 2018 in Applied Catalysis B: Environmental
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Haoyang Jiang; Ken-Ichi Katsumata; Jeongsoo Hong; Akira Yamaguchi; Kazuya Nakata; Chiaki Terashima; Nobuhiro Matsushita; Masahiro Miyauchi; Akira Fujishima. Photocatalytic reduction of CO2 on Cu2O-loaded Zn-Cr layered double hydroxides. Applied Catalysis B: Environmental 2018, 224, 783 -790.

AMA Style

Haoyang Jiang, Ken-Ichi Katsumata, Jeongsoo Hong, Akira Yamaguchi, Kazuya Nakata, Chiaki Terashima, Nobuhiro Matsushita, Masahiro Miyauchi, Akira Fujishima. Photocatalytic reduction of CO2 on Cu2O-loaded Zn-Cr layered double hydroxides. Applied Catalysis B: Environmental. 2018; 224 ():783-790.

Chicago/Turabian Style

Haoyang Jiang; Ken-Ichi Katsumata; Jeongsoo Hong; Akira Yamaguchi; Kazuya Nakata; Chiaki Terashima; Nobuhiro Matsushita; Masahiro Miyauchi; Akira Fujishima. 2018. "Photocatalytic reduction of CO2 on Cu2O-loaded Zn-Cr layered double hydroxides." Applied Catalysis B: Environmental 224, no. : 783-790.