Basic Information

Academic Degree

• 修士（工学）(立命館大学)
• 博士（理学）(立命館大学)

Language of Instruction

• Japanese

ID,URL

• ORCID ID

  0000-0003-1798-1987

• J-Global ID

  202101002021961201

• Researcher number

  90851428

Website(s) (URL(s))

• http://www.uchimoto.jinkan.kyoto-u.ac.jp/

researchmap URL

• https://researchmap.jp/t-watana3546

Research

Research Topics, Overview of the research

• Research Topics

  水電解、燃料電池、全固体電池、コンピュータ断層撮影（CT）、その場計測

• Overview of the research

  今後、環境負荷の低い社会を実現するために、自然エネルギーを効率よく利用するための様々な技術開発が必要である。その技術には、自然エネルギーの余剰電力を利用した、水を電解して水素を生成する水電解技術、余剰電力を貯蔵するリチウムイオン二次電池などの蓄電デバイス、また水電解により生成した水素を電気エネルギーに変換する燃料電池などの様々な電気化学デバイスが重要である。これらの電気化学デバイスの中で起こる現象を解明するために、放射光X線を用いたコンピュータ断層撮影（CT）法による解析を適用して、より高性能なデバイスを開発するための研究を行っている。放射光X線を用いたCT法は、高い空間分能、時間分解能を持ち非破壊でデバイス内部の現象を3次元で可視化できる。電気化学デバイス内部で起こるミクロな物質移動、化学状態変化などの現象を解明して新規材料の開発や電気化学デバイスの高性能化に貢献する研究を行っている。

Papers

• Unraveling the Degradation Mechanism of LiNbO₃‐Coated NCM Cathode at High Potential in All‐Solid‐State Batteries Using 10 K Extended X‐ray Absorption Fine Structure Analysis

  Yong Jun Park; Yixiao Su; Kentaro Yamamoto; Toshiki Watanabe; Neha Thakur; Mukesh Kumar; Toshiyuki Matsunaga; Yoshiharu Uchimoto

  Batteries & Supercaps, 05 Feb. 2025

  
• Cathode Design Based on Nitrogen Redox and Linear Coordination of Cu Center for All-Solid-State Fluoride-Ion Batteries

  Datong Zhang; Kentaro Yamamoto; Zulai Cao; Yanchang Wang; Zhuoyan Zhong; Hisao Kiuchi; Toshiki Watanabe; Toshiyuki Matsunaga; Koji Nakanishi; Hidenori Miki; Hideki Iba; Yoshihisa Harada; Koji Amezawa; Kazuhiko Maeda; Hiroshi Kageyama; Yoshiharu Uchimoto

  Journal of the American Chemical Society, 13 Jan. 2025

  
• Hierarchical reaction analysis of the effect of high-temperature storage on the electrode characteristics and safety of high-nickel cathodes

  Xian Shi; Toshiki Watanabe; Kentaro Yamamoto; Mukesh Kumar; Neha Thakur; Toshiyuki Matsunaga; Hideki Iba; Masayuki Nagamine; Kiyoshi Kanamura; Yoshiharu Uchimoto

  Journal of Power Sources, Mar. 2025

  
• Hierarchical Reactions Involving Dynamic Structural Changes in Lithium-Ion Batteries during Overcharge Using Advanced Analytical Techniques

  Xian Shi; Toshiki Watanabe; Kentaro Yamamoto; Mukesh Kumar; Neha Thakur; Toshiyuki Matsunaga; Masanori Fujii; Hajime Kinoshita; Hideki Iba; Masayuki Nagamine; Kiyoshi Kanamura; Yoshiharu Uchimoto

  Journal of The Electrochemical Society, 03 Dec. 2024

  
• Phase-Transition-Induced Crack Formation in LiNi_0.8Mn_0.1Co_0.1O₂ Cathode Materials: A Comparative Study of Single-Crystalline and Polycrystalline Morphologies Using Operando X-ray CT

  Xian Shi; Toshiki Watanabe; Kentaro Yamamoto; Mukesh Kumar; Neha Thakur; Toshiyuki Matsunaga; Masanori Fujii; Hajime Kinoshita; Hideki Iba; Masayuki Nagamine; Kiyoshi Kanamura; Yoshiharu Uchimoto

  ACS Applied Energy Materials, 21 Nov. 2024

  
• Structural insights and electronic state analysis of PtNi nanowire catalysts by operando high-energy resolution fluorescence detection X-ray absorption spectroscopy

  Weijie Cao; Neha Thakur; Mukesh Kumar; Tomoki Uchiyama; Yunfei Gao; Satoshi Tominaka; Akihiko Machida; Toshiki Watanabe; Ryota Sato; Toshiharu Teranishi; Masashi Matsumoto; Hideto Imai; Yoshiharu Sakurai; Yoshiharu Uchimoto

  Journal of Materials Chemistry A, 2024

  
• Fluoride Ion Storage and Conduction Mechanism in Fluoride Ion Battery Positive Electrode, Ruddlesden–Popper-Type Layered Perovskite La_1.2Sr_1.8Mn₂O₇ Crystal

  Hidenori Miki; Toshiyuki Matsunaga; Zhuoran Li; Zulai Cao; Kentaro Yamamoto; Mukesh Kumar; Neha Thakur; Toshiki Watanabe; Hideki Iba; Shintaro Kobayashi; Shogo Kawaguchi; Kazutaka Ikeda; Masato Hagihala; Takashi Kamiyama; Akihide Kuwabara; Hiroshi Kageyama; Kazuhiko Maeda; Yoshiharu Uchimoto

  Inorganic Chemistry, 07 Oct. 2024

  
• Reversible Fluoride-Ion (De)Intercalation of CuLaO₂ Cathodes with Crystalline/Amorphous Phase Transition Involving Multi-Electron Reaction

  Zulai Cao; Kentaro Yamamoto; Toshiyuki Matsunaga; Mukesh Kumar; Neha Thakur; Toshiki Watanabe; Koji Nakanishi; Hidenori Miki; Hideki Iba; Koji Amezawa; Hiroshi Kageyama; Yoshiharu Uchimoto

  ACS Applied Energy Materials, 30 Jul. 2024

  
• A Modified Galvanic Cell Synthesis of Pd@Pt Core–Shell Nanowire Catalysts: Structural Insights and Enhanced ORR Performance

  Weijie Cao; Mukesh Kumar; Neha Thakur; Tomoki Uchiyama; Yunfei Gao; Satoshi Tominaka; Akihiko Machida; Toshiki Watanabe; Ryota Sato; Toshiharu Teranishi; Masashi Matsumoto; Hideto Imai; Yoshiharu Sakurai; Yoshiharu Uchimoto

  ACS Applied Energy Materials, 13 Sep. 2024

  
• Structure and particle surface analysis of Li2S–P2S5–LiI-type solid electrolytes synthesized by liquid-phase shaking

  Kazuhiro Hikima; Kaito Ogawa; Radian Febi Indrawan; Hirofumi Tsukasaki; Satoshi Hiroi; Koji Ohara; Kazutaka Ikeda; Toshiki Watanabe; Toshiyuki Matsunaga; Kentaro Yamamoto; Shigeo Mori; Yoshiharu Uchimoto; Atsunori Matsuda

  Journal of Solid State Electrochemistry, 13 May 2024

  
• Revealing the Unusual Mechanism of Mixed Cationic and Anionic Redox in Oxyfluorosulfide Cathode for All-Solid-State Fluoride-Ion Batteries

  Zulai Cao; Kentaro Yamamoto; Toshiyuki Matsunaga; Toshiki Watanabe; Mukesh Kumar; Neha Thakur; Ryogo Ohashi; Shintaro Tachibana; Hidenori Miki; Kazuto Ide; Hideki Iba; Hisao Kiuchi; Yoshihisa Harada; Yuki Orikasa; Yoshiharu Uchimoto

  Chemistry of Materials, 14 Feb. 2024

  
• Accelerated fluoride-ion intercalation/deintercalation in a layered-perovskite cathode by controlling the interlayer distance for fluoride-ion batteries

  Hidenori Miki; Kentaro Yamamoto; Cao Shuo; Toshiyuki Matsunaga; Mukesh Kumar; Neha Thakur; Yuki Sakaguchi; Toshiki Watanabe; Hideki Iba; Hiroshi Kageyama; Yoshiharu Uchimoto

  Solid State Ionics, Mar. 2024

  
• Transient phase change of Ruddlesden-Popper type perovskite on fluoride-ion intercalation reaction

  Hidenori Miki; Kentaro Yamamoto; Toshiyuki Matsunaga; Toshiki Watanabe; Mukesh Kumar; Neha Thakur; Hideki Iba; Hiroshi Kageyama; Yoshiharu Uchimoto

  Solid State Ionics, Mar. 2024

  
• Tuning the ionic and electronic paths in Li2S-based cathode for high-rate performance all-solid-state lithium‑sulfur batteries

  Wenli Pan; Toshiki Watanabe; Toshiyuki Matsunaga; Mukesh Kumar; Neha Thakur; Kentaro Yamamoto; Masayuki Uesugi; Akihisa Takeuchi; Atsushi Sakuda; Akitoshi Hayashi; Masahiro Tatsumisago; Yoshiharu Uchimoto

  Solid State Ionics, Mar. 2024

  
• Phase Transition Mechanism of ZnMn₂O₄ Spinel Oxide with Electrochemical Magnesium-Ion Insertion

  Kentaro Yamamoto; Feilure Tuerxun; Toshiyuki Matsunaga; Toshiki Watanabe; Tomoki Uchiyama; Aierxiding Abulikemu; Kiyoshi Kanamura; Yoshiharu Uchimoto

  The Journal of Physical Chemistry C, 26 Jan. 2024

  
• Double-Layered Perovskite Oxyfluoride Cathodes with High Capacity Involving O–O Bond Formation for Fluoride-Ion Batteries

  Hidenori Miki; Kentaro Yamamoto; Hiroyuki Nakaki; Takahiro Yoshinari; Koji Nakanishi; Shinji Nakanishi; Hideki Iba; Jun Miyawaki; Yoshihisa Harada; Akihide Kuwabara; Yanchang Wang; Toshiki Watanabe; Toshiyuki Matsunaga; Kazuhiko Maeda; Hiroshi Kageyama; Yoshiharu Uchimoto

  Journal of the American Chemical Society, 09 Jan. 2024

  
• Influence of Primary Particle Morphology and Hydrophilicity of Carbon Matrix on Electrode Coating Quality and Performance of Practical High‐Energy‐Density Li–S Batteries

  Shanglin Li; Zhaoyue Chen; Kentaro Yamamoto; Toshiki Watanabe; Yoshiharu Uchimoto; Yuki Mori; Gen Inoue; Kazuya Ohuchi; Satoshi Inagaki; Kazuhide Ueno; Kaoru Dokko; Masayoshi Watanabe

  Advanced Materials Interfaces, 03 Jan. 2024

  
• High-Performance Copper/Copper Oxide-Based Cathode Prepared by a Facile Ball-Milling Method for All-Solid-State Fluoride-Ion Batteries

  Zulai Cao; Kentaro Yamamoto; Datong Zhang; Toshiyuki Matsunaga; Mukesh Kumar; Neha Thakur; Toshiki Watanabe; Hidenori Miki; Hideki Iba; Koji Amezawa; Yoshiharu Uchimoto

  ACS Applied Energy Materials, 16 Nov. 2023

  
• Improving the Cyclic Reversibility of Layered Li-Rich Cathodes by Combining Oxygen Vacancies and Surface Fluorination

  Aierxiding Abulikemu; Toshiyuki Matsunaga; Xian Shi; Mukesh Kumar; Neha Thakur; Tsuyoshi Takami; Kentaro Yamamoto; Tomoki Uchiyama; Toshiki Watanabe; Miki Inada; Yoshiharu Uchimoto

  ACS Applied Materials & Interfaces, 15 Nov. 2023

  
• Investigating Degradation Mechanisms in PtCo Alloy Catalysts: The Role of Co Content and a Pt-Rich Shell Using Operando High-Energy Resolution Fluorescence Detection X-ray Absorption Spectroscopy

  Yunfei Gao; Neha Thakur; Tomoki Uchiyama; Weijie Cao; Kentaro Yamamoto; Toshiki Watanabe; Mukesh Kumar; Ryota Sato; Toshiharu Teranishi; Hideto Imai; Yoshiharu Sakurai; Yoshiharu Uchimoto

  ACS Applied Materials & Interfaces, 31 Oct. 2023

  
• An Electron/Ion Dual Conductive Integrated Cathode Using Cationic/Anionic Redox for High‐Energy‐Density All‐Solid‐State Lithium‐Sulfur Batteries

  Wenli Pan; Kentaro Yamamoto; Toshiyuki Matsunaga; Toshiki Watanabe; Mukesh Kumar; Neha Thakur; Tomoki Uchiyama; Masayuki Uesugi; Akihisa Takeuchi; Atsushi Sakuda; Akitoshi Hayashi; Masahiro Tatsumisago; Yoshiharu Uchimoto

  Batteries & Supercaps, 27 Oct. 2023, Peer-reviewed

  
• Improving electrochemical performance of Li₂S cathode based on point defect control with cation/anion dual doping

  Pan Wenli; Kentaro Yamamoto; Nobuya Machida; Toshiyuki Matsunaga; Mukesh Kumar; Neha Thakur; Toshiki Watanabe; Atsushi Sakuda; Akitoshi Hayashi; Masahiro Tatsumisago; Yoshiharu Uchimoto

  Journal of Materials Chemistry A, 2023

  
• In situ X-CT observation of crack initiation and propagation in CFRP with X-ray microscopy

  Kimura M; Takeichi Y; Niwa Y; Watanabe T

  33rd Technical Conference of the American Society for Composites 2018, 2018, Peer-reviewed

  
• Nano mechanical testing for in situ X-CT observation of CFRP

  Watanabe T; Takeichi Y; Niwa Y; Kimura M

  33rd Technical Conference of the American Society for Composites 2018, 2018, Peer-reviewed

  
• Origin of High Activity and Durability of Confined Ordered Intermetallic PtCo Catalysts for the Oxygen Reduction Reaction in Rotating Disk Electrode and Fuel Cell Operating Conditions

  Yunfei Gao; Tomoki Uchiyama; Kentaro Yamamoto; Toshiki Watanabe; Satoshi Tominaka; Neha Thakur; Ryota Sato; Toshiharu Teranishi; Hideto Imai; Yoshiharu Sakurai; Yoshiharu Uchimoto

  ACS Catalysis, 04 Aug. 2023

  
• Preventing Capacity Fading in Lithium–Sulfur Batteries Using Sulfur Confinement in Mesoporous Carbon and Fluorinated Solvent-Based Electrolytes

  Yuya Torii; Yukiko Matsui; Kentaro Yamamoto; Satoshi Uchida; Shigeaki Yamazaki; Toshiki Watanabe; Koji Nakanishi; Tomoki Uchiyama; Yoshiharu Uchimoto; Masashi Ishikawa

  The Journal of Physical Chemistry C, 26 Jul. 2023, Peer-reviewed

  
• High-Packing-Density Electrodes by Self-forming Ion Conduction Pathway During Charge Process for All-Solid-State Lithium Ion Batteries

  Kentaro Yamamoto; Yao Xiao; Toshiki Watanabe; Atsushi Sakuda; Masakuni Takahashi; Wenli Pan; Koji Nakanishi; Toshiyuki Matsunaga; Masayuki Uesugi; Akihisa Takeuchi; Kentaro Uesugi; Akitoshi Hayashi; Masahiro Tatsumisago; Yoshiharu Uchimoto

  The Journal of Physical Chemistry C, 21 Jul. 2023, Peer-reviewed

  
• Y₂S₃-Doped Li₂S Active Cathode Materials for All-Solid-State Li–S Batteries

  Kazuhiro Hikima; Ryo Fujii; Hirotada Gamo; Hirofumi Tsukasaki; Shigeo Mori; Toshiki Watanabe; Kentaro Yamamoto; Yoshiharu Uchimoto; Hiroyuki Muto; Atsunori Matsuda

  The Journal of Physical Chemistry C, 06 Jul. 2023

  
• Finding Degradation Trigger Sites of Structural Materials for Airplanes Using X-Ray Microscopy

  Kimura, Masao; Takeichi, Yasuo; Watanabe, Toshiki; Niwa, Yasuhiro; Kimijima, Ken'ichi

  The Chemical Record, 2019, Peer-reviewed

  
• Nanoscopic origin of cracks in carbon fibre-reinforced plastic composites

  Kimura, M.; Watanabe, T.; Takeichi, Y.; Niwa, Y.

  Sci Rep, 2019, Peer-reviewed

  
• Development of spectromicroscopes for multiscale observation of heterogeneity in materials at photon factory, IMSS, KEK

  Niwa, Yasuhiro; Takeichi, Yasuo; Watanabe, Toshiki; Kimura, Masao

  AIP Conference Proceedings, 2019, Peer-reviewed

  
• Development of in situ cell for simultaneous XAFS/XRD measurements at high temperatures

  Kimijima, Ken’ichi; Watanabe, Toshiki; Takeichi, Yasuo; Niwa, Yasuhiro; Kimura, Masao

  Radiation Physics and Chemistry, 2019, Peer-reviewed

  
• Protection Against Absorption Passivation on Platinum by a Nitrogen-Doped Carbon Shell for Enhanced Oxygen Reduction Reaction

  Yunfei Gao; Tomoki Uchiyama; Kentaro Yamamoto; Toshiki Watanabe; Neha Thakur; Ryota Sato; Toshiharu Teranishi; Hideto Imai; Yoshiharu Sakurai; Yoshiharu Uchimoto

  ACS Applied Materials & Interfaces, 17 Jun. 2023

  
• Unique lithium precipitation behavior inside Li₃PS₄ solid electrolyte observed via multimodal/multiscale operando X-ray computed tomography

  Jaehee Park; Toshiki Watanabe; Kentaro Yamamoto; Tomoki Uchiyama; Tsuyoshi Takami; Atsushi Sakuda; Akitoshi Hayashi; Masahiro Tatsumisago; Yoshiharu Uchimoto

  Chemical Communications, 2023

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• Properties of Composite Electrodes for All-solid-state Fluoride-ion Secondary Batteries Processed by High-pressure Torsion

  Yanchang WANG; Sangmin LEE; Kentaro YAMAMOTO; Toshiyuki MATSUNAGA; Hidenori MIKI; Hideki IBA; Koichi TSUCHIYA; Tomoki UCHIYAMA; Toshiki WATANABE; Tsuyoshi TAKAMI; Yoshiharu UCHIMOTO

  Electrochemistry, 2023

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• 3D Spectromicroscopic Observation of Yb-Silicate Ceramics Using XAFS-CT

  Takeichi, Yasuo; Watanabe, Toshiki; Niwa, Yasuhiro; Kitaoka, Satoshi; Kimura, Masao

  Microscopy and Microanalysis, 2018, Peer-reviewed

  
• In situ XRM Observation of Cracking in CFRP during Nanomechanical Testing

  Watanabe, Toshiki; Takeichi, Yasuo; Niwa, Yasuhiro; Kimura, Masao

  Microscopy and Microanalysis, 2018, Peer-reviewed

  
• Oxyfluoride Cathode for All-Solid-State Fluoride-Ion Batteries with Small Volume Change Using Three-Dimensional Diffusion Paths

  Yanchang Wang; Tsuyoshi Takami; Zhuoran Li; Kentaro Yamamoto; Toshiyuki Matsunaga; Tomoki Uchiyama; Toshiki Watanabe; Hidenori Miki; Toshihiko Inoue; Hideki Iba; Uichiro Mizutani; Hirokazu Sato; Kazuhiko Maeda; Hiroshi Kageyama; Yoshiharu Uchimoto

  Chemistry of Materials, 14 Nov. 2022

  
• Partial cation disorder in Li₂MnO₃ obtained by high-pressure synthesis

  Aierxiding Abulikemu; Shenghan Gao; Toshiyuki Matsunaga; Hiroshi Takatsu; Cédric Tassel; Hiroshi Kageyama; Takashi Saito; Toshiki Watanabe; Tomoki Uchiyama; Kentaro Yamamoto; Yoshiharu Uchimoto; Tsuyoshi Takami

  Applied Physics Letters, 02 May 2022, Peer-reviewed

  
• Quadruple perovskite oxides CaMn7O12 proceed by two‐active‐site reaction mechanism for oxygen evolution reaction

  Yadan Ren; Kodai Kashihara; Tomoki Uchiyama; Yuki Orikasa; Toshiki Watanabe; Kentaro Yamamoto; Tsuyoshi Takami; Toshiyuki Matsunaga; Yoshinori Nishiki; Shigenori Mitsushima; Yoshiharu Uchimoto

  ChemElectroChem, 29 Oct. 2021, Peer-reviewed

  
• Reversible and Fast (De)fluorination of High‐Capacity Cu2O Cathode: One Step Toward Practically Applicable All‐Solid‐State Fluoride‐Ion Battery

  Datong Zhang; Kentaro Yamamoto; Yanchang Wang; Shenghan Gao; Tomoki Uchiyama; Toshiki Watanabe; Tsuyoshi Takami; Toshiyuki Matsunaga; Koji Nakanishi; Hidenori Miki; Hideki Iba; Koji Amezawa; Kazuhiko Maeda; Hiroshi Kageyama; Yoshiharu Uchimoto

  Advanced Energy Materials, 17 Oct. 2021, Peer-reviewed

  
• Quantitative Evaluation of the Activity of Low-Spin Tetravalent Nickel Ion Sites for the Oxygen Evolution Reaction

  Yadan Ren; Tomoya Horiguchi; Tomoki Uchiyama; Yuki Orikasa; Toshiki Watanabe; Kentaro Yamamoto; Tsuyoshi Takami; Toshiyuki Matsunaga; Yoshinori Nishiki; Shigenori Mitsushima; Yoshiharu Uchimoto

  ACS Applied Energy Materials, 26 Sep. 2021

  
• Rate-Determining Process at Electrode/Electrolyte Interfaces for All-Solid-State Fluoride-Ion Batteries

  Datong Zhang; Hiroyuki Nakano; Kentaro Yamamoto; Kenta Tanaka; Tatsuma Yahara; Kazuyuki Imai; Takuya Mori; Hidenori Miki; Shinji Nakanishi; Hideki Iba; Toshiki Watanabe; Tomoki Uchiyama; Koji Amezawa; Yoshiharu Uchimoto

  ACS Applied Materials & Interfaces, 21 Jun. 2021

  
• Cu–Pb Nanocomposite Cathode Material toward Room-Temperature Cycling for All-Solid-State Fluoride-Ion Batteries

  Datong Zhang; Takahiro Yoshinari; Kentaro Yamamoto; Yuya Kitaguchi; Aika Ochi; Koji Nakanishi; Hidenori Miki; Shinji Nakanishi; Hideki Iba; Toshiki Watanabe; Tomoki Uchiyama; Yuki Orikasa; Koji Amezawa; Yoshiharu Uchimoto

  ACS Applied Energy Materials, 06 Apr. 2021

  
• Operando X-ray Absorption Spectroscopic Study on the Effect of Ionic Liquid Coverage upon the Oxygen Reduction Reaction Activity of Pd-core Pt-shell Catalysts

  Chen LIU; Tomoki UCHIYAMA; Jyunichi ISHIHARA; Kentaro YAMAMOTO; Toshiki WATANABE; Hideto IMAI; Koichiro OSHIMA; Shigeki SAKURAI; Minoru INABA; Yoshiharu UCHIMOTO

  Electrochemistry, 05 Jan. 2021

  
• Understanding the reaction mechanism and performances of 3d transition metal cathodes for all-solid-state fluoride ion batteries

  Datong Zhang; Kentaro Yamamoto; Aika Ochi; Yanchang Wang; Takahiro Yoshinari; Koji Nakanishi; Hiroyuki Nakano; Hidenori Miki; Shinji Nakanishi; Hideki Iba; Tomoki Uchiyama; Toshiki Watanabe; Koji Amezawa; Yoshiharu Uchimoto

  Journal of Materials Chemistry A, 2021

  
• Effect of Interaction among Magnesium Ions, Anion, and Solvent on Kinetics of the Magnesium Deposition Process

  Feilure Tuerxun; Kentaro Yamamoto; Toshihiko Mandai; Yoshitaka Tateyama; Koji Nakanishi; Tomoki Uchiyama; Toshiki Watanabe; Yusuke Tamenori; Kiyoshi Kanamura; Yoshiharu Uchimoto

  The Journal of Physical Chemistry C, 15 Dec. 2020

  
• Nanoscale in situ observation of damage formation in carbon fiber/epoxy composites under mixed-mode loading using synchrotron radiation X-ray computed tomography

  Masao Kimura; Toshiki Watanabe; Sota Oshima; Yasuo Takeichi; Yasuhiro Niwa; Yuji Seryo; Masaki Hojo

  Composites Science and Technology, Feb. 2022

  
• State of the Active Site in La_1–xSr_xCoO_3−δ Under Oxygen Evolution Reaction Investigated by Total-Reflection Fluorescence X-Ray Absorption Spectroscopy

  Yadan Ren; Jun Oyama; Tomoki Uchiyama; Yuki Orikasa; Toshiki Watanabe; Kentaro Yamamoto; Tsuyoshi Takami; Yoshinori Nishiki; Shigenori Mitsushima; Yoshiharu Uchimoto

  ACS Applied Energy Materials, 25 Apr. 2022

  
• Studies on the inhibition of lithium dendrite formation in sulfide solid electrolytes doped with LiX (X = Br, I)

  Seunghoon Yang; Masakuni Takahashi; Kentaro Yamamoto; Koji Ohara; Toshiki Watanabe; Tomoki Uchiyama; Tsuyoshi Takami; Atsushi Sakuda; Akitoshi Hayashi; Masahiro Tatsumisago; Yoshiharu Uchimoto

  Solid State Ionics, Apr. 2022

  
• Anion Substitution at Apical Sites of Ruddlesden–Popper-type Cathodes toward High Power Density for All-Solid-State Fluoride-Ion Batteries

  Yanchang Wang; Kentaro Yamamoto; Yoshihiro Tsujimoto; Toshiyuki Matsunaga; Datong Zhang; Zulai Cao; Koji Nakanishi; Tomoki Uchiyama; Toshiki Watanabe; Tsuyoshi Takami; Hidenori Miki; Hideki Iba; Kazuhiko Maeda; Hiroshi Kageyama; Yoshiharu Uchimoto

  Chemistry of Materials, 05 Jan. 2022

  
• High Rate Capability from a Graphite Anode through Surface Modification with Lithium Iodide for All-Solid-State Batteries

  Seunghoon Yang; Kentaro Yamamoto; Xiaohan Mei; Atsushi Sakuda; Tomoki Uchiyama; Toshiki Watanabe; Tsuyoshi Takami; Akitoshi Hayashi; Masahiro Tatsumisago; Yoshiharu Uchimoto

  ACS Applied Energy Materials, 19 Dec. 2021, Peer-reviewed

  
• Investigation of the Suppression of Dendritic Lithium Growth with a Lithium-Iodide-Containing Solid Electrolyte

  Masakuni Takahashi; Toshiki Watanabe; Kentaro Yamamoto; Koji Ohara; Atsushi Sakuda; Takuya Kimura; Seunghoon Yang; Koji Nakanishi; Tomoki Uchiyama; Masao Kimura; Akitoshi Hayashi; Masahiro Tatsumisago; Yoshiharu Uchimoto

  Chemistry of Materials, 15 Jun. 2021

  
• Impact of the Composition of Alcohol/Water Dispersion on the Proton Transport and Morphology of Cast Perfluorinated Sulfonic Acid Ionomer Thin Films

  Xiao Gao; Kentaro Yamamoto; Tomoyasu Hirai; Noboru Ohta; Tomoki Uchiyama; Toshiki Watanabe; Hideto Imai; Seiho Sugawara; Kazuhiko Shinohara; Yoshiharu Uchimoto

  ACS Omega, 24 May 2021

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• Improvement of lithium ionic conductivity of Li3PS4 through suppression of crystallization using low-boiling-point solvent in liquid-phase synthesis

  Masakuni Takahashi; Seunghoon Yang; Kentaro Yamamoto; Koji Ohara; Nguyen Huu Huy Phuc; Toshiki Watanabe; Tomoki Uchiyama; Atsushi Sakuda; Akitoshi Hayashi; Masahiro Tatsumisago; Hiroyuki Muto; Atsunori Matsuda; Yoshiharu Uchimoto

  Solid State Ionics, Mar. 2021

  
• High Ionic Conductivity of Liquid-Phase-Synthesized Li3PS4 Solid Electrolyte, Comparable to That Obtained via Ball Milling

  Kentaro Yamamoto; Seunghoon Yang; Masakuni Takahashi; Koji Ohara; Tomoki Uchiyama; Toshiki Watanabe; Atsushi Sakuda; Akitoshi Hayashi; Masahiro Tatsumisago; Hiroyuki Muto; Atsunori Matsuda; Yoshiharu Uchimoto

  ACS Applied Energy Materials, 12 Feb. 2021

  
• Phase Transition Behavior of MgMn2O4 Spinel Oxide Cathode during Magnesium Ion Insertion

  Feilure Tuerxun; Saeko Otani; Kentaro Yamamoto; Toshiyuki Matsunaga; Hiroaki Imai; Toshihiko Mandai; Toshiki Watanabe; Tomoki Uchiyama; Kiyoshi Kanamura; Yoshiharu Uchimoto

  Chemistry of Materials, 09 Feb. 2021

  
• Operando X-ray Absorption Spectroscopic Study on the Influence of Specific Adsorption of the Sulfo Group in the Perfluorosulfonic Acid Ionomer on the Oxygen Reduction Reaction Activity of the Pt/C Catalyst

  Chen Liu; Tomoki Uchiyama; Noriyuki Nagata; Masazumi Arao; Kentaro Yamamoto; Toshiki Watanabe; Xiao Gao; Hideto Imai; Syota Katayama; Seiho Sugawara; Kazuhiko Shinohara; Koichiro Oshima; Shigeki Sakurai; Yoshiharu Uchimoto

  ACS Applied Energy Materials, 21 Jan. 2021

  
• Kinetic Analysis and Alloy Designs for Metal/Metal Fluorides toward High Rate Capability for All-solid-state Fluoride Ion Batteries

  Takahiro Yoshinari; Datong Zhang; Kentaro Yamamoto; Yuya Kitaguchi; Aika Ochi; Koji Nakanishi; Hidenori Miki; Shinji Nakanishi; Hideki Iba; Tomoki Uchiyama; Toshiki Watanabe; Toshiyuki Matsunaga; Koji Amezawa; Yoshiharu Uchimoto

  Journal of Materials Chemistry A, 2021

  
• Effect of Temperature on Oxygen Reduction Reaction Kinetics for Pd Core–Pt Shell Catalyst with Different Core Size

  Chen Liu; Tomoki Uchiyama; Kentaro Yamamoto; Toshiki Watanabe; Xiao Gao; Hideto Imai; Masashi Matsumoto; Seiho Sugawara; Kazuhiko Shinohara; Koichiro Oshima; Shigeki Sakurai; Yoshiharu Uchimoto

  ACS Applied Energy Materials, 28 Dec. 2020

  
• Comparison of Sulfur Cathode Reactions between a Concentrated Liquid Electrolyte System and a Solid-State Electrolyte System by Soft X-Ray Absorption Spectroscopy

  Yao Xiao; Kentaro Yamamoto; Yukiko Matsui; Toshiki Watanabe; Atsushi Sakuda; Koji Nakanishi; Tomoki Uchiyama; Akitoshi Hayashi; Shoso Shingubara; Masahiro Tatsumisago; Masashi Ishikawa; Masayoshi Watanabe; Yoshiharu Uchimoto

  ACS Applied Energy Materials, 17 Dec. 2020

  
• Substrate-dependent proton transport and nanostructural orientation of perfluorosulfonic acid polymer thin films on Pt and carbon substrate

  Xiao Gao; Kentaro Yamamoto; Tomoyasu Hirai; Noboru Ohta; Tomoki Uchiyama; Toshiki Watanabe; Masakuni Takahashi; Naoki Takao; Hideto Imai; Seiho Sugawara; Kazuhiko Shinohara; Yoshiharu Uchimoto

  Solid State Ionics, Dec. 2020

  
• The Effect of Cation Mixing in LiNiO 2 toward the Oxygen Evolution Reaction

  Yadan Ren; Ryusei Yamaguchi; Tomoki Uchiyama; Yuki Orikasa; Toshiki Watanabe; Kentaro Yamamoto; Toshiyuki Matsunaga; Yoshinori Nishiki; Shigenori Mitsushima; Yoshiharu Uchimoto

  ChemElectroChem, 17 Nov. 2020

  
• Synthesis of Sulfide Solid Electrolytes through the Liquid Phase: Optimization of the Preparation Conditions

  Kentaro Yamamoto; Masakuni Takahashi; Koji Ohara; Nguyen Huu Huy Phuc; Seunghoon Yang; Toshiki Watanabe; Tomoki Uchiyama; Atsushi Sakuda; Akitoshi Hayashi; Masahiro Tatsumisago; Hiroyuki Muto; Atsunori Matsuda; Yoshiharu Uchimoto

  ACS Omega, 13 Oct. 2020

  
• Nanoscale in situ observations of crack initiation and propagation in carbon fiber/epoxy composites using synchrotron radiation X-ray computed tomography

  Toshiki Watanabe; Yasuo Takeichi; Yasuhiro Niwa; Masaki Hojo; Masao Kimura

  Composites Science and Technology, Sep. 2020

  
• Nanoscale crack initiation and propagation in carbon fiber/epoxy composites using synchrotron: 3D image data

  Toshiki Watanabe; Yasuo Takeichi; Yasuhiro Niwa; Masaki Hojo; Masao Kimura

  Data in Brief, Aug. 2020

  
• Operando soft X-ray absorption spectroscopic study on microporous carbon-supported sulfur cathodes

  Yao Xiao; Kentaro Yamamoto; Yukiko Matsui; Toshiki Watanabe; Koji Nakanishi; Tomoki Uchiyama; Shoso Shingubara; Masashi Ishikawa; Masayoshi Watanabe; Yoshiharu Uchimoto

  RSC Advances, 2020

  

Misc.

• Elucidation of reaction mechanism at the anode/electrolyte interface in Mg[B(HFIP₄)]₂ electrolytes

  FEILURE Tuerxun; 山本健太郎; 万代俊彦; 館山佳尚; 中西康次; 内山智貴; 渡邊稔樹; 金村聖志; 内本喜晴

  電池討論会PDF要旨集(CD-ROM), 2020

  
• Investigation of carbon-fiber reinforced plastic using synchrotron radiation~non-destructive observation of crack propagation & chemical-states mapping of carbon~

  木村正雄; 渡邊稔樹; 武市泰男; 丹羽尉博; 原野貴幸; 村尾玲子

  検査技術, 2021

  

External funds: Kakenhi

• Determination of trigger sites for crack formation in aeronautical composite by combining X-ray microscopy and applied mathematics

  Grant-in-Aid for Scientific Research (A)

  Medium-sized Section 26:Materials engineering and related fields

  High Energy Accelerator Research Organization

  木村 正雄

  From 01 Apr. 2019, To 31 Mar. 2024, Granted

  複合材料;X線顕微鏡;放射光;パーシステントホモロジー;機械学習;X-CT;顕微分光;CFRP;き裂

  https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19H00834/