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Synthesis of a visible-light-responsive photocatalyst electrode system using a semiconductor heterojunction via a metal layer

Research Project

Project/Area Number 19H02823
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 36020:Energy-related chemistry
Research InstitutionKanagawa Institute of Industrial Sclence and Technology

Principal Investigator

Akiyama Kensuke  地方独立行政法人神奈川県立産業技術総合研究所, 化学技術部, 上席研究員 (70426360)

Co-Investigator(Kenkyū-buntansha) 祖父江 和治  地方独立行政法人神奈川県立産業技術総合研究所, 化学技術部, 主任研究員 (10426413)
高橋 亮  地方独立行政法人神奈川県立産業技術総合研究所, 化学技術部, 主任研究員 (00426404)
国松 昌幸  地方独立行政法人神奈川県立産業技術総合研究所, 化学技術部, 主任研究員 (20426414)
Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2022: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2021: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2020: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2019: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
Keywords半導体ヘテロ接合 / 光触媒 / 水分解 / 半導体ヘテロ構造 / 電極 / 半導体ヘテロ接 / 光電極
Outline of Research at the Start

本研究は、金属層を介してp型とn型の半導体を接合させることにより、光触媒の還元反応に用いる伝導帯下端の電極電位、及び酸化反応に用いる価電子帯上端の電極電位を制御する。これにより光触媒反応に寄与する電子と正孔の化学ポテンシャルが制御された光電極型の光触媒反応システムを構築し、水分解による水素 (H2)と酸素 (O2)の発生特性を評価する。
このシステムに0.8 eVの禁制帯幅を持つp型半導体の鉄シリサイド(β-FeSi2)を用いて、太陽光スペクトルの近赤外光まで応答する光電極システムを創製する。

Outline of Final Research Achievements

A solid-state Z-scheme system is constructed whereby rutile TiO2 and iron silicide (β-FeSi2) were combined to act as O2- and H2-evolution photocatalysts, connected by Au or Ag and their alloy layer. The photoexcited electrons in the conduction band (CB) of β-FeSi2 causes the reduction of protons to H2, and the photogeneration of holes in the valence band (VB) of TiO2 causes the oxidation of water to O2. In addition, the photogenerated holes in the VB of β-FeSi2 and the photoexcited electrons in the CB of TiO2 combined with each other in the inserted metal layer, affording the completion of the overall photocatalytic water-splitting. The standard electrode potential of the inserted metal layer of this system shift to the negative potential side as the Ag concentration of the inserted metal layer increased. This result suggests that the potentials of bottom of the CB of β-FeSi2 and the top of the VB of TiO2 bonded with the inserted metal can be controlled.

Academic Significance and Societal Importance of the Research Achievements

金属層を介して水素発生用光触媒(p型)と酸素発生用光触媒(n型)を接合させることにより、光触媒の還元反応に用いる伝導帯下端の電極電位、及び酸化反応に用いる価電子帯上端の電極電位を制御できることが明らかとなった。これにより光触媒反応に寄与する電子と正孔の化学ポテンシャルが制御された光電極型、及び粉末系光触媒反応システム構築が可能となった。このことは、水分解反応系に留まらず光触媒効果を用いた光-化学エネルギー変換において、そのエネルギー変換効率向上への新たなシステム・材料設計の指針提案となる。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (18 results)

All 2023 2022 2021 2020 2019 Other

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 1 results) Presentation (11 results) (of which Int'l Joint Research: 3 results) Remarks (1 results) Patent(Industrial Property Rights) (2 results)

  • [Journal Article] Luminescent iron disilicide film growth by metal-organic chemical vapor Deposition2023

    • Author(s)
      Kensuke Akiyama and Masaru Itakura
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 62 Issue: SI Pages: SI1002-SI1002

    • DOI

      10.35848/1347-4065/acb952

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Synthesis of a Gold-Inserted Iron Disilicide and Rutile Titanium Dioxide Heterojunction Photocatalyst via the Vapor-Liquid-Solid Method and Its Water-Splitting Reaction2022

    • Author(s)
      K. Akiyama, S. Nojima, Y. Ito, M. Ushiyama, T. Okuda, and H. Irie
    • Journal Title

      ACS Omega

      Volume: 7 Issue: 43 Pages: 3874438751-3874438751

    • DOI

      10.1021/acsomega.2c04360

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Epitaxial growth of Mg2Si films on (111) Si substrates covered with epitaxial SiC layers2020

    • Author(s)
      Atsuo Katagiri, Shota Ogawa, Takao Shimizu, Masaaki Matsushima, Kensuke Akiyama, Hiroshi Uchida, Hiroshi Funakubo
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 59 Issue: SF Pages: SF1001-SF1001

    • DOI

      10.7567/1347-4065/ab65b0

    • NAID

      210000157936

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Kinetics of Interfacial Microstructural Variation across Insulator-Thermoelectric Semiconductor interface and its Effects on Thermoelectric Properties of Magnesium Silicide Thin Films2019

    • Author(s)
      P.S. Sankara Rama Krishnan, Anna N. Morozovska, Eugene A. Eliseev, Shota Ogawa, Atsuo Katagiri, Masaaki Matsushima, Kensuke Akiyama, Hiroshi Uchida, Hiroshi Funakubo
    • Journal Title

      Materialia

      Volume: 7 Pages: 100375-100378

    • DOI

      10.1016/j.mtla.2019.100375

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Presentation] 光触媒効果による水分解に向けたTa3N5とβ-FeSi2の複合粒子合成2023

    • Author(s)
      秋山賢輔,奥田徹也,入江寛
    • Organizer
      第70回応用物理学会春季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 鉄シリサイド/窒化タンタル複合粒子の光触媒効果による水分解2023

    • Author(s)
      秋山賢輔、長沼康弘、奥田徹也、入江寛
    • Organizer
      日本化学会 第103春季年会
    • Related Report
      2022 Annual Research Report
  • [Presentation] β-FeSi2/TiO2複合粒子の光触媒効果に及ぼす還元反応助触媒及びCrOx被覆層の影響2022

    • Author(s)
      秋山 賢輔,奥田 徹也,伊藤 裕子,牛島 幹夫, 長沼 康弘,入江寛
    • Organizer
      第83回応用物理学会秋季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Luminescent Epitaxial β-FeSi2 Film Growth by MOCVD2022

    • Author(s)
      Kensuke Akiyama and Hiroshi Funakubo
    • Organizer
      43ed International Symposium on Dry Process
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ドーピングした鉄シリサイド膜のフォトルミネッセンス発光特性2022

    • Author(s)
      秋山賢輔、舟窪浩
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] ルチル酸化チタンと鉄シリサイドが接合した光触媒複合粉末への水素発生助触媒担持の検討2022

    • Author(s)
      秋山賢輔、入江寛
    • Organizer
      日本化学会第102春季年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] β-FeSi2/TiO2複合粒子の作製条件と光触媒効果による水分解特性2021

    • Author(s)
      秋山賢輔、本泉佑、長沼康弘、舟窪浩、入江寛
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 鉄シリサイド/ルチル型酸化チタン複合粒子の光触媒効果による水分解2021

    • Author(s)
      秋山賢輔、本泉佑、長沼康弘、入江寛
    • Organizer
      日本化学会第101春季年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Growth and photoluminescence properties of P-doped β-FeSi22020

    • Author(s)
      K. Akiyama, R. Takahashi and H. Funakubo
    • Organizer
      SPIE Photonics West 2020
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Preparation of Mg2Si-based thin films and these properties2019

    • Author(s)
      A. Katagiri, M. Uehara, T. Shimizu, M. Matsushima, K. Akiyama, H. Uchida, Y. Kimura, H. Funakubo
    • Organizer
      The Fifth Asia-Pacific Conference on Semiconducting Silicides and Related Materials
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] リン(P)ドーピングした鉄シリサイドのPL発光特性2019

    • Author(s)
      秋山賢輔、野島咲子、高橋亮、舟窪浩
    • Organizer
      第80回応用物理学会秋季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Remarks] 神奈川県立産業技術総合研究所 研究成果

    • URL

      https://www.kistec.jp/research/

    • Related Report
      2022 Annual Research Report 2021 Annual Research Report 2020 Annual Research Report 2019 Annual Research Report
  • [Patent(Industrial Property Rights)] 光触媒複合材料2022

    • Inventor(s)
      秋山賢輔
    • Industrial Property Rights Holder
      秋山賢輔
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2022-001295
    • Filing Date
      2022
    • Related Report
      2021 Annual Research Report
  • [Patent(Industrial Property Rights)] 光触媒複合材料2021

    • Inventor(s)
      秋山賢輔
    • Industrial Property Rights Holder
      秋山賢輔
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2021-009205
    • Filing Date
      2021
    • Related Report
      2020 Annual Research Report

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Published: 2019-04-18   Modified: 2024-01-30  

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