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Improvement in Efficiency of Dinitrogen Fixation Using Conducting Polymer/Titanium Oxide Junction System

Research Project

Project/Area Number 15350092
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Environmental chemistry
Research InstitutionChiba University

Principal Investigator

HOSHINO Katsuyoshi  Chiba University, Department of Information and Image Sciences, Faculty of Engineering, Professor, 工学部, 教授 (50192737)

Co-Investigator(Kenkyū-buntansha) KITAMURA Takashi  Chiba University, Department of Information and Image Sciences, Faculty of Engineering, Professor, 工学部, 教授 (20009541)
Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥9,400,000 (Direct Cost: ¥9,400,000)
Fiscal Year 2004: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2003: ¥7,400,000 (Direct Cost: ¥7,400,000)
KeywordsNitrogen Fixation / Titanium Oxide / Organic / Inorganic Junction / Inorganic Interface / Oxygen Vacancy / Conducting Polymer / Anodic Oxidation / Chemical Bond Formation
Research Abstract

Nitrogen fixation systems driven by white light under mild conditions was investigated. The typical system consists of titanium oxide(TiOx) and poly(3-methylthiophene)(P3MeT), and their heterojunction is previously shown to produce ammonium salt crystals (NH_4ClO_4) when exposed to white light in air at 20℃ and 40%RH. The aims of this study have been directed to the collection of experimental data which would allow us to elucidate the fixation mechanism and to the investigation of material conditions for increasing the fixation rate and the fixation yield.
First, the mechanistic study was performed by the chemical and physical approaches. The former approach revealed that the fixation process consists of the formation of ammonia at the junction interface and its conversion to ammonium salt in the polymer bulk. The latter approach gave the data suggesting that the oxygen vacancy on the titanium oxide surface plays the role of a site for the adsorption, activation, and reduction of dinitrogen.
Secondly, we investigated the material conditions to affect the fixation yield and the fixation rate. The results indicated that the use of polycarbazole films leads to the enhancement in the fixation yield and that the use of titanium oxide prepared electrochemically in aqueous phosphoric acid increases the fixation rate. The former improvement was explained by the high concentration of dopant anion species in the polycarbazole (i.e., high doping density), and the latter by the high density of oxygen deficiency on the titanium oxide surface synthesized in phosphoric acid.

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (15 results)

All 2004 2003 Other

All Journal Article (11 results) Book (1 results) Publications (3 results)

  • [Journal Article] Characterization and malarial conditions of conducting polymer/titanium oxide hybrid systems used for dinitrogen fixation under ordinary pressure and temperature2004

    • Author(s)
      Tomohisa Ogawa
    • Journal Title

      Electrochemistry Communications 6

      Pages: 55-60

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Dinitrogen Fixation Using Polyfnran-Titanium Oxide and Polycarbazole-Titanium Oxide Hybrid Junction Systems2004

    • Author(s)
      Tomohisa Ogawa
    • Journal Title

      Journal of Photopolymer Science and Technology 17・1

      Pages: 143-148

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] チタン陽極酸化膜/導電性ポリマー接合の界面電気物性2004

    • Author(s)
      小川 智央
    • Journal Title

      表面科学 25・7

      Pages: 392-400

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] 次世代エネルギー変換プロセスとしての窒素固定2004

    • Author(s)
      星野 勝義
    • Journal Title

      ケミカルエンジニアリング 49・1

      Pages: 1-5

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Characterization and Material Conditions of Conducting Polymer/Titanium Oxide Hybrid Systems Used for Dinitrogen Fixation Under Ordinary Pressure and Temperature2004

    • Author(s)
      Tomohisa Ogawa
    • Journal Title

      Electrochemistry Communications 6

      Pages: 55-60

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Dinitrogen Fixation Using Polyfuran-Titanium Oxide and Polycarbazole-Titanium Oxide Hybrid Junction Systems2004

    • Author(s)
      Tomohisa Ogawa
    • Journal Title

      Journal of Photopolymer Science and Technology 17-1

      Pages: 143-148

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Electronic Properties at the Junction Interfaces Between Anodic Titanium Oxide Films and Conducting Polymers2004

    • Author(s)
      Tomohisa Ogawa
    • Journal Title

      Journal of Surface Science Society of Japan 25-7

      Pages: 392-400

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Nitrogen Fixation as the Future Energy Conversion Process2004

    • Author(s)
      Katsuyoshi Hoshino
    • Journal Title

      Chemical Engineering 49-1

      Pages: 1-5

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Characterization and material conditions of conducting polymer/titanium oxide hybrid systems used for dinitrogen fixation under ordinary pressure and temperature2004

    • Author(s)
      Tomohisa Ogawa
    • Journal Title

      Electrochemistry Communications 6

      Pages: 55-60

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Dinitrogen Fixation Using Polyfuran-Titanium Oxide and Polycarbazole-Titanium Oxide Hybrid Junction Systems2004

    • Author(s)
      Tomohisa Ogawa
    • Journal Title

      Journal of Photopolymer Science and Technology 17・1

      Pages: 143-148

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Improvement in Oragnics/Inorganics Junction Interfaces2003

    • Author(s)
      Katsuyoshi Hoshino
    • Journal Title

      Control of Inorganics/Polymers Nano-Interfaces (Ed.By the Society of Polymer Science, Jpn)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Book] 無機/高分子ナノ界面制御2004

    • Author(s)
      星野 勝義
    • Total Pages
      36
    • Publisher
      高分子学会
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] Tomohisa Ogawa: "Characterization and material conditions of conducting polymer/titanium oxide hybrid systems used for dinitrogen fixation under ordinary pressure and temperature"Electrochemistry Communications. 6巻. 55-60 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 星野 勝義: "次世代エネルギー変換プロセスとしての窒素固定"ケミカルエンジニアリング. 49・1. 1-5 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 小川 智央: "チタン陽極酸化膜/導電性ポリマー接合の界面電気物性"表面科学. 25・7(掲載予定). (2004)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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