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Conversion Reaction of Dissimilar Metal Oxides to Chalcogenide Alloy Nanosheets in Supercritical Hydrothermal Reductive Field

Research Project

Project/Area Number 19K21103
Project/Area Number (Other) 18H05937 (2018)
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund (2019)
Single-year Grants (2018)
Review Section 0401:Materials engineering, chemical engineering, and related fields
Research InstitutionTohoku University

Principal Investigator

Nakayasu Yuta  東北大学, 学際科学フロンティア研究所, 助教 (20827042)

Project Period (FY) 2018-08-24 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords超臨界水 / 水熱還元 / TMDs / 水素発生 / TMDCs / 層状カルコゲナイド
Outline of Research at the Start

本研究では、「超臨界水熱還元場」という特殊な反応場を用いることで、低温条件の下、化学的に安定な異種金属酸化物と固体カルコゲン元素(硫黄・セレンの単体)から、カルコゲナイド合金ナノシートへの高速変換反応を達成することを目的とする。さらに、合成されたカルコゲナイド合金ナノシートを電気分解用の水素発生カソード材料に応用する。本成果は、持続可能社会における金属酸化物のリサイクル技術および、水素社会の発展に貢献するものである。

Outline of Final Research Achievements

The objective of this study is to achieve a rapid conversion reaction from chemically stable dissimilar metal oxides and solid chalcogen elements into chalcogenide alloy nanosheets under low temperature conditions by using a supercritical hydrothermal reduction field. In previous studies, supercritical hydrothermal synthesis is mainly used for the synthesis of metal oxides, and there are few bottom-up synthesis examples of metal chalcogenide nanosheets. By using a reducitive field, metal-chalcogenide nanosheets were synthesized in one-pot by causing reduction and sulfurization reactions of metal oxides and chalcogen elements with a higher oxidation number than the target product. Specifically, we succeeded in synthesizing Mo(S,Se)2 and (Mo,W)S2, and analyzed the mechanism of formation of MoS2 in supercritiacl hydrothermal condition.

Academic Significance and Societal Importance of the Research Achievements

超臨界水熱還元場での材料合成例は僅少であり、金属酸化物から金属カルコゲナイドを合成している例もほぼ皆無である。本研究成果により、超臨界水熱還元場での金属カルコゲナイドナノシート合成が技術的に可能であることを示したとともに、その環境適合性やプロセス優位性を主張できたと考えられる。また、金属酸化物から金属カルコゲナイドナノシートの合成プロセスを分析したことは、今後の材料プロセス工学の発展のために意義がある。数十種類以上ある金属カルコゲナイドナノシートは多種多様なデバイス材料への応用が期待されており、社会的要請が強い材料であることから、当研究が示した成果は社会的にも意義があると言える。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Annual Research Report
  • Research Products

    (8 results)

All 2019 Other

All Int'l Joint Research (2 results) Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 3 results)

  • [Int'l Joint Research] Victoria University of Wellington(ニュージーランド)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Newcastle University(オーストラリア)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Rapid synthesis of defective and composition-controlled metal chalcogenide nanosheets by supercritical hydrothermal processing2019

    • Author(s)
      Yuta Nakayasu, Siobhan Bradley, Hiroaki Kobayashi, Keiichiro Nayuki, Yoshikazu Sasaki, Takaaki Tomai, Thomas Nann and Itaru Honma
    • Journal Title

      Nanoscale Advances

      Volume: 1 Issue: 9 Pages: 3383-3387

    • DOI

      10.1039/c9na00435a

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Synthesis of MoS2 nanosheets by supercritical hydrothermal process and their electrocatalytic properties for hydrogen evolution2019

    • Author(s)
      Y. Takahashi, Y. Nakayasu, H. Kobayashi, I. Honma
    • Organizer
      18th Asian Pacific Confederation of Chemical Engineering Congress
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Rapid fabrication of metallic MoS2 thin film by hydrothermal electrodeposition for electrocatalytic hydrogen evolution reaction2019

    • Author(s)
      Y. Nakayasu, S. Katahira, H. Kobayashi, I. Honma
    • Organizer
      18th Asian Pacific Confederation of Chemical Engineering Congress
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 水熱電解析出法によるMoS2/グラフェンカソードの作製2019

    • Author(s)
      中安祐太
    • Organizer
      化学工学会第50回秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Synthesis of Mo(S,Se)2 and (Mo,W)S2 Nanosheets from Metal-Oxide and Pure-Chalcogen Precursors In Supercritical Fluids2019

    • Author(s)
      Yuta Nakayasu
    • Organizer
      2018 MRS Fall Meeting
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 水素発生電極に資するエッジリッチ構造を有したMo(S,Se)2と(Mo,W)S2ナノシートの超臨界水熱合成2019

    • Author(s)
      中安祐太
    • Organizer
      第66回応用物理学会春季学術講演会
    • Related Report
      2018 Annual Research Report

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Published: 2018-08-27   Modified: 2024-03-26  

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