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Development of Proton-Conducting Materials using Ceramics Nanosheets Working at Low-Medium Temperatures.

Research Project

Project/Area Number 22K14767
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 36020:Energy-related chemistry
Research InstitutionKumamoto University

Principal Investigator

Awaya Keisuke  熊本大学, 大学院先端科学研究部(工), 助教 (10910656)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2023: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2022: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Keywords遷移金属酸化物ナノシート / プロトン伝導体 / 自立膜 / 異方性材料 / 燃料電池 / 低次元性材料(ナノシート) / 層状遷移金属酸化物 / 層状シリケート / 層状複水酸化物(LDH)
Outline of Research at the Start

ナノシートは層状結晶を単層剥離して得られる二次元性材料である.一枚のナノシートは,横サイズが数μmなのに対し,厚さが1 nm程度しかないため、結晶格子の全てが最表面に位置する特異な構造をもつ.本研究では,層状遷移金属酸化物や層状シリケート等より剥離したナノシートを数百~数千枚積層させたナノシート自立膜を作製し,中低温領域下(100-300 ℃)にて高いプロトン伝導度を示す燃料電池用プロトン伝導膜の開発を行う.また,ナノシートの面内にナノサイズの細孔を開けることで,ナノシートの面に対し垂直な方向にプロトンが移動可能なチャンネルとし,更なるプロトン伝導度の向上を図る.

Outline of Final Research Achievements

In the present study, we evaluated the proton conductivity of transition metal oxide nanosheet free-standing membranes (Ti0.91O2, TiNbO5, Nb3O8, MnO2, Mn0.75Co0.25O2, Ca2Nb3O10, thickness: 22-32μm) along cross-sectional or in-plane directions. The maximal values for cross-sectional and in-plane direction of the membrane were 9.8×10-5 for Ca2Nb3O10 nanosheet and 6.4×10-2 S/cm for Nb3O8 nanosheet, respectively (90 ℃, 100%RH). The ratio of proton conductivities along in-plane direction over along cross-sectional direction was approximately 50-40000, which clearly reflected the restacking, anisotropic structure of the nanosheet free-standing membranes.
In the case of Ca2Nb3O10 nanosheet free-standing membrane, the values for in-plane direction were 3.4×10-3 and 3.0×10-4S/cm at 100 ℃ and 130 ℃, respectively.

Academic Significance and Societal Importance of the Research Achievements

本研究では耐熱性に乏しい酸化グラフェンの代替となる二次元プロトン伝導体を探索するため、セラミックスナノシートを調査対象とした。遷移金属酸化物ナノシート自立膜は、従来のセラミックス膜としては類のない柔軟さを有するうえ、高配向な積層構造を由来とする異方的性質を示す。一般的に脱水の激しい温度域では、高いプロトン伝導度を維持することが難しいとされる。一方、セラミックスナノシート自立膜の面内方向のプロトン伝導性は100℃近傍でも10-4~10-3S/cm程度の値を示しており、積層方向を制御することで作動温度域のより広いプロトン伝導膜となり得ることを示した点において学術的意義は大きいものと考える。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (13 results)

All 2024 2023 2022

All Journal Article (4 results) (of which Peer Reviewed: 4 results) Presentation (9 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results)

  • [Journal Article] Tunable Photoluminescence of Bismuth‐ and Trivalent‐Lanthanide‐Doped Monolayer Perovskite Oxide Nanosheets2024

    • Author(s)
      Awaya Keisuke、Hatakeyama Kazuto、Ida Shintaro
    • Journal Title

      Advanced Optical Materials

      Volume: 12 Issue: 1 Pages: 2301228-2301228

    • DOI

      10.1002/adom.202301228

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Controlling Thickness of Aurivillius Phase Perovskite Nanosheets Obtained by Delaminating Bi2SrNan-2NbnO3n+3 (n = 2-5) Layered Crystal2023

    • Author(s)
      Awaya Keisuke、Hatakeyama Kazuto、Ida Shintaro
    • Journal Title

      Chemistry of Materials

      Volume: 35 Issue: 24 Pages: 10524-10532

    • DOI

      10.1021/acs.chemmater.3c02062

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Stress-Induced Photoluminescence Change of Monolayer Nanosheet Prepared by Delamination of Aurivillius-Phase Layered Perovskite2023

    • Author(s)
      Keisuke Awaya, Shintaro Ida
    • Journal Title

      Chemistry of Materials

      Volume: - Issue: 9 Pages: 3713-3721

    • DOI

      10.1021/acs.chemmater.3c00466

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Multicolor Luminescent Material Based on Interaction between TiNbO5- Nanosheets and Lanthanide Ions for Visualization of pH Change in Inorganic Gel Electrolyte2022

    • Author(s)
      Keisuke Awaya, Kei-ichiro Iso, Shintaro Ida
    • Journal Title

      Nanoscale

      Volume: 14 Issue: 45 Pages: 16874-16882

    • DOI

      10.1039/d2nr03806d

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] Ptサブナノ粒子を担持した金属リン酸塩の構造および触媒特性2024

    • Author(s)
      粟屋恵介、西山昂志、佐藤友香、大山順也、遠藤慶徳、永尾有希、若林誉、町田正人
    • Organizer
      第62回セラミックス基礎科学討論会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Ptを担持したリン酸ジルコニウムナノシートの構造およびH2-SCR活性2024

    • Author(s)
      粟屋恵介、佐藤友香、西山昂志、大山順也、伊田進太郎、町田正人
    • Organizer
      公益社団法人日本セラミックス協会 2024年年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 希土類含有酸化物ナノシートの合成とその発光特性2023

    • Author(s)
      粟屋恵介、伊田進太郎
    • Organizer
      第39回 希土類討論会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Aurivillius型層状ペロブスカイトより剥離したBi3+置換型ナノシートの発光特性2023

    • Author(s)
      粟屋恵介、伊田進太郎
    • Organizer
      公益社団法人日本セラミックス協会 第36回秋季シンポジウム
    • Related Report
      2023 Annual Research Report
  • [Presentation] Mechanochromic Photoluminescence of Bi3+, Ln3+-doped (Ln = La, Eu, Tb, Sm, Dy) Aurivillius Perovskite Nanosheet.2023

    • Author(s)
      Keisuke Awaya、Kazuto Hatakeyama、Shintaro Ida
    • Organizer
      The 37th International Korea-Japan Seminar on Ceramics (KJ-Ceramics 37)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] pHに応じて発光色が変化するEu3+/Tb3+-TiNbO5-ナノシート層状体の開発2023

    • Author(s)
      粟屋恵介、伊田進太郎
    • Organizer
      公益社団法人日本セラミックス協会 2023年 年会
    • Related Report
      2022 Research-status Report
  • [Presentation] Eu3+/Tb3+-TiNbO5ナノシート層状体の発光色のpH依存性2022

    • Author(s)
      粟屋恵介、伊田進太郎
    • Organizer
      第38回 希土類討論会
    • Related Report
      2022 Research-status Report
  • [Presentation] Preparation of Transition Metal Cations/Manganese Cobalt Oxide Nanosheet Electrostatic Self-Assembly for Catalytic Toluene Combustion2022

    • Author(s)
      Keisuke Awaya, Yuto Koyanagi, Kazuto Hatakeyama, Shintaro Ida
    • Organizer
      The Sino-Japan Symposium on Environmental Catalysis
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Preparation of Metastable Layered Manganese Cobalt Oxide Nanosheet Catalysts for Catalytic Toluene Combustion2022

    • Author(s)
      Keisuke Awaya, Yuto Koyanagi, Kazuto Hatakeyama, Shintaro Ida
    • Organizer
      The 9th Tokyo Conference on Advanced Catalytic Science and Technology (TOCAT9)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research

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Published: 2022-04-19   Modified: 2025-01-30  

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