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Development of High-Performance Thermoelectric Materials by Local Structure Control of Cu-S-based Tetrahedral Network

Research Project

Project/Area Number 20H02440
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 26020:Inorganic materials and properties-related
Research InstitutionKyushu University

Principal Investigator

Suekuni Koichiro  九州大学, 総合理工学研究院, 准教授 (10582926)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000)
Fiscal Year 2022: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2021: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2020: ¥11,180,000 (Direct Cost: ¥8,600,000、Indirect Cost: ¥2,580,000)
Keywords熱電材料 / 熱電物性 / 硫化物 / 銅ー硫黄系化合物 / 格子間原子 / 熱伝導率 / 銅硫化物 / 出力因子 / 熱電変換
Outline of Research at the Start

熱エネルギーを電気エネルギーに直接変換できる熱電物質は、未利用熱を電力として回収する熱電発電への応用が期待されている。本研究では、熱電物質として有望な人工銅硫化物を対象として、結晶構造の局所的特徴が熱電物性に与える影響を系統的に調べ、得られた知見を基にして熱電性能を高める。具体的には、出力因子の向上と格子熱伝導率の低減をもたらす局所構造を同定し、それらを併せ持つ高性能な材料を創製する。

Outline of Final Research Achievements

In this study on copper-sulfur-based compounds, we revealed impacts of local structure in the tetrahedral framework on the thermoelectric properties and enhanced the thermoelectric conversion performance by controlling the local structure. Specifically, for a compound, colusite, reduction in the thermal conductivity and enhancement of the power factor were achieved by the introduction of interstitial atoms and vacancies, and elemental substitution, leading to a good performance (dimensionless figure of merit, ZT=0.8-0.9 at 673 K). Impacts of local structure on the electrical and thermal properties were also investigated for other compounds.

Academic Significance and Societal Importance of the Research Achievements

固体のゼーベック効果を利用する熱電発電は、未利用熱から電力を回収する手段として注目されている技術である。その固体、つまり熱電変換材料の性能向上に向けた取り組みが、現在、世界的に進められている。本研究では、資源豊富で安価、かつ低毒性な元素である銅と硫黄を主成分とする化合物について、結晶構造の局所的特徴が熱電物性(電気的、熱的特性)に与える影響を解明すると共に高性能化を達成した。得られた知見は、高性能な熱電変換材料の開発に貢献するものであり、高効率な熱電発電の実現に結び付くものと期待される。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (22 results)

All 2022 2021 2020 Other

All Int'l Joint Research (6 results) Journal Article (3 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 3 results) Presentation (13 results) (of which Int'l Joint Research: 3 results,  Invited: 4 results)

  • [Int'l Joint Research] CRISMAT/Universite de Rennes 1/University of Lorraine(フランス)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Central Michigan University(米国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] CRISMAT/Universite de Rennes 1(フランス)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Central Michigan University(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] CRISMAT/Universite de Rennes 1(フランス)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Central Michigan University(米国)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Cu-S-based thermoelectric compounds with a sphalerite-derived disordered crystal structure2022

    • Author(s)
      Shota Hirayama, Koichiro Suekuni, Philipp Sauerschnig, Michihiro Ohta, Michitaka Ohtaki
    • Journal Title

      Journal of Solid State Chemistry

      Volume: 309 Pages: 122960-122960

    • DOI

      10.1016/j.jssc.2022.122960

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Key Role of d0 and d10 Cations for the Design of Semiconducting Colusites: Large Thermoelectric ZT in Cu26Ti2Sb6S32 Compounds2021

    • Author(s)
      Takashi Hagiwara, Koichiro Suekuni, Pierric Lemoine, Andrew R. Supka, Raju Chetty, Emmanuel Guilmeau, Bernard Raveau, Marco Fornari, Michihiro Ohta, Rabih Al Rahal Al Orabi, Hikaru Saito, Katsuaki Hashikuni, Michitaka Ohtaki
    • Journal Title

      Chemistry of Materials

      Volume: 33 Issue: 9 Pages: 3449-3456

    • DOI

      10.1021/acs.chemmater.1c00872

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Synergistic Effect of Chemical Substitution and Insertion on the Thermoelectric Performance of Cu26V2Ge6S32 Colusite2021

    • Author(s)
      Yuta Shimizu, Koichiro Suekuni, Hikaru Saito, Pierric Lemoine, Emmanuel Guilmeau, Bernard Raveau, Raju Chetty, Michihiro Ohta, Toshiro Takabatake, Michitaka Ohtaki
    • Journal Title

      Inorganic Chemistry

      Volume: 60 Issue: 15 Pages: 11364-11373

    • DOI

      10.1021/acs.inorgchem.1c01321

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Cu7TixV1-xSnS8の熱的安定性と熱電物性2022

    • Author(s)
      香西 秀哉、末國 晃一郎、高橋 聖弥、西堀 英治、SAUERSCHNIG Philipp、太田 道広、大瀧 倫卓
    • Organizer
      第83回応用物理学会秋季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 乱れた原子配置を有するCu3.1Ti0.25Sn0.9S4の硫黄欠損と熱電特性2022

    • Author(s)
      平山 翔大、末國 晃一郎、SAUERSCHNIG Philipp、太田 道広、大瀧 倫卓
    • Organizer
      第83回応用物理学会秋季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] コルーサイトCu26T2M3Sb3S32 (T = V, Nb, Ta; M = Ge, Sn)の結晶構造と熱電物性2022

    • Author(s)
      末國 晃一郎、萩原 岳志、高橋 聖弥、西堀 英治、SAUERSCHNIG Philipp、太田 道広、大瀧 倫卓
    • Organizer
      第83回応用物理学会秋季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] THERMOELECTRIC COLUSITES WITH A VARIETY OF CATIONIC DISTRIBUTION2022

    • Author(s)
      Koichiro Suekuni
    • Organizer
      XXX International Materials Research Congress (IMRC2022) and International Conference on Advanced Materials (ICAM2021)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 銅-硫黄系熱電材料の探索:結晶構造と物性の関係2022

    • Author(s)
      末國 晃一郎
    • Organizer
      九州大学エネルギーウイーク 2022(EW2022)筑紫シンポジウム
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 多元銅硫化物系熱電半導体の開発動向2022

    • Author(s)
      末國 晃一郎
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 新規銅硫化物系熱電半導体Cu7VSnS8の結晶構造解析とキャリア濃度制御2022

    • Author(s)
      香西 秀哉,末國 晃一郎,西堀 英治,SAUERSCHNIG Philipp,太田 道広,大瀧 倫卓
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 乱れた原子配置を有する銅硫化物系熱電変換材料2021

    • Author(s)
      平山 翔大, 末國 晃一郎,Sauerschnig Philipp, 太田 道広, 大瀧 倫卓
    • Organizer
      第18回日本熱電学会学術講演会(TSJ2021)
    • Related Report
      2021 Annual Research Report
  • [Presentation] Cu3SbS4-Cu4TiS4 擬二元系における新規熱電半導体の探索2021

    • Author(s)
      萩原 岳志, 末國 晃一郎, Lemoine Pierric, Sauerschnig Philipp, 太田 道広, 大瀧 倫卓
    • Organizer
      第18回日本熱電学会学術講演会(TSJ2021)
    • Related Report
      2021 Annual Research Report
  • [Presentation] Cu26Ti2Sb6-xGexS32 colusite with high thermoelectric performance2021

    • Author(s)
      Takashi Hagiwara, Koichiro Suekuni, Pierric Lemoine, Andrew R. Supka, Raju Chetty, Emmanuel Guilmeau, Bernard Raveau, Marco Fornari, Michihiro Ohta, Rabih Al Rahal Al Orabi, Hikaru Saito, Katsuaki Hashikuni, Michitaka Ohtaki
    • Organizer
      1st Japan-France Virtual Workshop on Thermoelectrics
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Cu-S-based semiconductors as efficient thermoelectric materials2021

    • Author(s)
      Koichiro Suekuni
    • Organizer
      Asian Conference on Crystal Growth and Crystal Technology (CGCT-8)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 格子間ドーピングによる熱電銅硫化物コルーサイトの熱伝導率低減2020

    • Author(s)
      末國 晃一郎、清水 裕太、斎藤 光、Chetty Raju、太田 道広、高畠 敏郎、大瀧 倫卓
    • Organizer
      第81回応用物理学会秋季学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 新規な高性能熱電銅硫化物Cu26Ti2Sb6-xGexS322020

    • Author(s)
      萩原 岳志、末國 晃一郎、橋國 克明、Chetty Raju、太田 道広、大瀧 倫卓
    • Organizer
      第17回日本熱電学会学術講演会(TSJ2020)
    • Related Report
      2020 Annual Research Report

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Published: 2020-04-28   Modified: 2024-01-30  

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