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Electrochemical CO2 conversion reaction under hydrothermal condition

Research Project

Project/Area Number 22K14760
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 36020:Energy-related chemistry
Research InstitutionTokyo Institute of Technology

Principal Investigator

Yamaguchi Akira  東京工業大学, 物質理工学院, 助教 (00756314)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2022: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords水熱電気化学 / 二酸化炭素還元 / 金属硫化物 / 水熱条件 / 電気化学
Outline of Research at the Start

本研究では、温度と圧力を独自に制御可能な水熱電気化学系という、これまでにない独自のシステムを用い、「水熱条件下での電気化学的な物質変換」という新しい試みを行うことで、効率的な二酸化炭素(CO2)還元系の構築を狙う。低誘電率、高圧である水熱条件下ではより効率的かつ省エネルギーで進行することが期待される。本研究ではこの系を用いてこれまで未踏の化学空間における触媒作動条件を探索することで、電気化学への温度/圧力の影響を検討するとともに、効率的なCO2還元系構築に向けた指針を得る

Outline of Final Research Achievements

We created a reactor capable of performing precise electrochemical measurements at temperatures up to 200℃, and synthesized MnO2 and MoS2 by electrodeposition. In the former case, it was found that changing the electrodeposition temperature alters the crystallinity and morphology, and changing the pressure alters the lattice constant. Furthermore, MnO2 deposited at 160°C showed higher oxygen evolution activity than that deposited at a lower temperature. Similarly, with regard to MoS2, it was found that the selectivity of CO2 reduction products changes with the electrodeposition pressure.
Furthermore, we attempted electrochemical CO2 reduction under hydrothermal conditions. As a result, when the reaction was carried out at 100°C, a compound containing two carbons was produced, which was not observed at lower temperatures.

Academic Significance and Societal Importance of the Research Achievements

本研究では、水熱環境において電析合成を行うことで、電極触媒の局所構造を変化させ、それにより触媒活性ならびに選択性が制御可能であることを示した。これは、温度と圧力が独立に制御可能であるという本研究で開発したリアクターの特徴により可能となったことである。これらの成果は、温度/圧力可変の当リアクターを用いることで、より高活性な触媒を合成できる可能性を示すものである。
また、100℃以上の水中での電気化学的CO2変換は本研究が初の試みであり、今後本研究を推進していくことで、効率的なCO2変換系を構築できるだけでなく、水熱下での電気化学反応という新たな学理が構築できると期待される。

Report

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

    (5 results)

All 2024 2023

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

  • [Journal Article] Hydrothermal electrochemical flow reactor to independently control temperature, pressure, and potential for manganese oxide electrodeposition2024

    • Author(s)
      Otsubo Yoshiki、Otani Kanan、Li Ailong、Adachi Kiyohiro、Kong Shuang、Kitadai Norio、Hashizume Daisuke、Nakamura Ryuhei、Fujita Takeshi、Miyauchi Masahiro、Yamaguchi Akira
    • Journal Title

      Ceramics International

      Volume: 50 Issue: 4 Pages: 5992-6000

    • DOI

      10.1016/j.ceramint.2023.11.265

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Temperature and Pressure Dependence of Hydrothermal Electrodeposition of Molybdenum Sulfide2024

    • Author(s)
      Yamaguchi Akira、Kubo Ryota、El Aisnada An Niza、Adachi Kiyohiro、Lee Ji-Eun、Kitadai Norio、Hashizume Daisuke、Nakamura Ryuhei、Miyauchi Masahiro
    • Journal Title

      ACS Applied Energy Materials

      Volume: 7 Issue: 7 Pages: 2593-2599

    • DOI

      10.1021/acsaem.3c02565

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Hydrothermal electrodeposition of molybdenum sulfide toward electrochemical CO2 reduction catalysts2023

    • Author(s)
      Akira Yamaguchi
    • Organizer
      243rd ECS meeting
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Hydrothermal Electrochemical Flow Reactor to Independently Control Temperature and Pressure for Electrodeposition for MnOx-based Water Oxidation Catalyst2023

    • Author(s)
      Akira Yamaguchi
    • Organizer
      ANM 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Hydrothermal Electrochemical Flow Reactor to Independently Control Temperature, and Pressure for Manganese Oxides Electrodeposition2023

    • Author(s)
      Akira Yamaguchi
    • Organizer
      MRM 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research

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

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