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Research Interests 【 display / non-display 】

Research Interests 【 display / non-display 】

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Research Areas 【 display / non-display 】

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Published Papers 【 display / non-display 】

• Zero-Overpotential Redox Reactions of Quinone-Based Molecules Confined in Carbon Micropores.

  Takimoto D, Suzuki K, Futamura R, Iiyama T, Hideshima S, Sugimoto W

  ACS applied materials & interfaces ( ACS applied materials & interfaces )  14 ( 27 ) 31131 - 31139   2022.07 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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• Enhancement in the Charge-Transfer Kinetics of Pseudocapacitive Iridium-Doped Layered Manganese Oxide.

  Saito R, Tanaka H, Teshima K, Takimoto D, Hideshima S, Sugimoto W

  Inorganic chemistry ( AMER CHEMICAL SOC )  61 ( 11 ) 4566 - 4571   2022.03 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  Birnessite manganese oxide is a promising candidate as an electrode material for aqueous supercapacitors owing to its pseudocapacitance associated with fast redox processes. While manganese oxides are semiconductive, the conductivity is much lower than that of typical materials used for capacitive electrodes such as activated carbon or ruthenium oxide. In an attempt to increase the electronic conductivity of birnessite, a new solid solution phase, K-y(Mn(1)(-x)Jr(x))O-2, was synthesized, and the electrochemical charge storage capability of Ir-doped birnessite was studied in aqueous Li2SO4. Structural characterization revealed that the single-phase K-y(Mn1-xIrx)O-2 could be synthesized up to x = 0.1. An increase in the pseudocapacitive charge was observed with the increase in Ir content. In addition to the increase in the pseudocapacitive charge, an unusual change in the peak potential was observed. The peakto-peak difference for the Mn4+/Mn3+ redox decreased with increasing Ir content, indicating an increase in the reversibility of the pseudocapacitive process. The decrease in peak-to-peak difference was observed only by Ir substitution and was not observed for physical mixtures of K0.28MnO2 and IrO2, suggesting a strong electronic interaction between the host Mn ion and the substituting Ir ion.

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• Fabrication of Three-Dimensional Porous Materials with NiO Nanowalls for Electrocatalytic Oxygen Evolution

  Daisuke Takimoto, Sho Hideshima, Wataru Sugimoto

  ACS APPLIED NANO MATERIALS ( AMER CHEMICAL SOC )  4 ( 8 ) 8059 - 8065   2021.08 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  Nanosheets are two-dimensional (2D) nanocrystals that exhibit superior electrochemical performance. However, nanosheets are typically stacked horizontally toward the current collector, leading to poor utilization of individual nanosheets. Although most studies have fabricated three-dimensional (3D) structures using nanosheets, the wall thickness was a few hundred nanometers, suggesting that hundreds of nanosheets were restacked along the wall. In this study, we demonstrated the fabrication of a 3D structure constructed by NiO nanowalls with a thickness of 2-3 nm (3D-NiO). The specific surface area of 3D-NiO was found to be 42 m(2) g(-1), which is 2.6 times larger than that of NiO nanoparticles. The specific capacity of 3D-NiO was 2.5 times higher than that of NiO nanoparticles and could be attributed to the large specific surface area because of the nature of the thin nanowalls. The O-2-evolution reaction (OER) activity of 3D-NiO at 1.65 V vs RHE was sixfold greater than that of NiO nanoparticles. The enhanced OER activity of 3D-NiO could be attributed to both the large specific surface area and the fabrication of diffusion paths within the 3D structure. The OER activity of 3D-NiO after 500 cycles was four times higher than that of NiO nanoparticles. Our results show that the 3D structure fabricated with thin nanowalls is a promising porous material for capacitor electrodes and electrocatalysts for applications in electrolysis and fuel cells.

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• Platinum Group Metal-based Nanosheets: Synthesis and Application towards Electrochemical Energy Storage and Conversion

  Wataru Sugimoto, Daisuke Takimoto

  CHEMISTRY LETTERS ( CHEMICAL SOC JAPAN )  50 ( 6 ) 1304 - 1312   2021.06 [ Peer Review Accepted ]

  Type of publication: Research paper (other science council materials etc.)

  　View Summary

  Advancement in synthetic materials chemistry has brought about a new family of two-dimensional nanostructures (nanosheets) which have a variety of promising applications. In particular, synthesis of platinum group metal (PGM) oxide nanosheets such as RuO2 and IrO2 and PGM nanosheets (Pt, Ru, Rh, Pd, etc) have attracted researchers owing to the advantages of nanosheets versus nanoparticles, and the wide range of applications that PGM materials may realize. This highlight review will provide a summary of state-of-the-art PGM nanosheets and a critical assessment on the possible applications of the innovative nanomaterials.

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• Direct preparation of core-shell platinum cathode in membrane electrode assembly catalyst layer for polymer electrolyte fuel cell

  Hiroshi Fukunaga, Kazuhiro Kachi, Daisuke Takimoto, Dai Mochizuki, Wataru Sugimoto

  INTERNATIONAL JOURNAL OF HYDROGEN ENERGY ( PERGAMON-ELSEVIER SCIENCE LTD )  45 ( 28 ) 14547 - 14551   2020.05 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  Core-shell catalyst has been attracting attention as a low-Pt catalyst for PEFC cathode. However, its mass production method has not yet been established. In this paper, a novel method suitable for continuous production of low-platinum catalyst layer for PEFC is proposed. Catalyst layer of carbon-supported Pd@Pt core-shell catalyst (Pd@Pt/C) is fabricated by using Cu underpotential deposition (UPD) followed by surface-limited redox replacement (SLRR) directly to the porous catalyst layer made of Pd core (Pd/C). The distribution of Pt corresponded well with that of Pd throughout the catalyst layer, indicating that the core-shell reaction occurs in the entire catalyst layer. Pd@Pt/C shows 1.8 times higher mass activity than Pt/C, which is comparable to Pd@Pt/C prepared by conventional microgram-scale method. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

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Other Papers 【 display / non-display 】

Other Papers 【 display / non-display 】

• Platinum Group Metal and Metal Oxide Nanosheets : Synthesis, Structure and Electrochemical Applications

    53 ( 5 ) 343 - 347   2018.05

   

Presentations 【 display / non-display 】

Presentations 【 display / non-display 】

• Oxygen evolution reaction of NiO nanowalls with a three-dimensional framework

  滝本 大裕

  PRiME2020  2020.10  -  2020.10 

• Synthesis of conductive nano-sized Magnéli-phase Ti4O7 with a core@shell structure

  Daisuke Takimoto, Y. Toda, S. Tominaka, D. Mochizuki, W. Sugimoto

  The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13)  2019.10  -  2019.10 

• Morphological effects on surface oxidation tolerance of metallic nanosheets

  Daisuke Takimoto, D. Mochizuki, S. Hideshima, W. Sugimoto, Q. Yuan, N. Takao, T. Itoh, T. V. T. Duy, T. Ohwaki, H. Imai

  236th ECS Meeting  2019.10  -  2019.10 

• 燃料電池用電極触媒に向けたコアシェル構造を設けた金属ナノシートの調製

  滝本大裕, 望月大, 杉本渉

  中部化学関係学協会支部連合秋季大会講演予稿集  2018.11  -  2018.11 

• Synthesis of Core-Shell Nanosheets Electrocatalysts for the Oxygen Reduction Reaction

  Daisuke Takimoto

  3rd International Conference on Emerging Advanced Nanomaterials  2018.10  -  2018.10 

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Academic Awards 【 display / non-display 】

Academic Awards 【 display / non-display 】

• 論文賞

  2020.12    

  Winner: Tomohiro YOSHIDA, Daisuke TAKIMOTO, Dai MOCHIZUKI, and Wataru SUGIMOTO

Grant-in-Aid for Scientific Research 【 display / non-display 】

Grant-in-Aid for Scientific Research 【 display / non-display 】

• Synthesis of three-dimensional architecture composed of two-dimensional nanowalls

  Grant-in-Aid for Early-Career Scientists

  Project Year: 2018.04  -  2020.03 

  Investigator(s): Takimoto Daisuke 

  Direct: 2,300,000 (YEN)  Overheads: 2,990,000 (YEN)  Total: 690,000 (YEN)

  　View Summary

  In this study, a new electrocatalyst with a three-dimensional architecture composed of a framework of NiO nanowalls was prepared. The electrocatalytic activity of three-dimensional architecture was higher than that of nanoparticles. The result strongly indicates that the 3D structure with 2D nanowall is a superior design for electrocatalyst. Considering the diffusion path of evolved molecules, the enhanced activity could also be attributed to the meso pore nature of 3D-NiO.

• Grant-in-Aid for JSPS Fellows

  Project Year: 2016.04  -  2018.03 

  Direct: 2,300,000 (YEN)  Overheads: 2,300,000 (YEN)  Total: 0 (YEN)

• Grant-in-Aid for JSPS Fellows

  Project Year: 2016.04  -  2018.03 

  Direct: 2,300,000 (YEN)  Overheads: 2,300,000 (YEN)  Total: 0 (YEN)

SDGs 【 display / non-display 】

SDGs 【 display / non-display 】