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Development of Intermediate Temperature Solid Oxide Fuel Cells employing New Electrolyte and Electrode

Research Project

Project/Area Number 15560611
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Structural/Functional materials
Research InstitutionNihon University

Principal Investigator

HASHIMOTO Takuya  Nihon University, College of Humanities and Sciences, Associate Professor, 文理学部, 助教授 (20212136)

Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2004: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2003: ¥2,900,000 (Direct Cost: ¥2,900,000)
Keywordssolid oxide fuel cell / solid electrlyte / electrode material / defect structure / ion conductor / reduction expansion / thermodynamic stabiblity / 化学的安定性 / 構造相転移 / 電気伝導 / 熱膨張特性 / 過電圧
Research Abstract

To develop solid oxide duel cells operating at temperatures lower than 700℃, stability and electrical property of various materials at high temperatures under various gas atmospheres were investigated. As new electrolyte materials, Ba_2In_2O_5 and La_<1-x>Sr_xGa_<1-y>Mg_yO_<3-δ> were estimated. The property of La_<0.6>Sr_<0.4>Co_<1-y>Ga_yO_<3-δ> and La_<1-x>Ca_xCrO_<3-δ> were analyzed from the viewpoint of cathode and interconnector materials, respectively.
It was revealed that the phase of Ba_2In_2O_5 at temperatures more than 1070℃, which was discovered in this work, had high thermodynamic stability and oxide ion conductivity under oxygen partial pressure of 1〜10^<-4> atm ; however, it was not suitable for electrolyte materials since it decomposed at 900℃ under fuel gas atmosphere with oxygen partial pressures lower than 10^<-17> atm. On the contrary, La_<1-x>Sr_xGa_<1-y>Mg_yO_<3-δ> has high potential for new electalyte materials since it showed high thermal stability and oxide ion co … More nductivity under oxygen partial pressure of 1〜10^<-22> atm. It was also discovered that the structural phase transition of La_<1-x>Sr_xGa_<1-y>Mg_yO_<3-δ>, which is one of the problems for application, can be suppressed by partial substitution of Al for Ga site.
La_<0.6>Sr_<0.4>Co_<1-y>Ga_yO_<3-δ> showed high oxide ion and hole conductivity under atmospheres for cathode electrode with oxygen partial pressure of 1〜10^<-4> atm. Since thermal expansion of La_<0.6>Sr_<0.4>Co_<1-y>Ga_yO_<3-δ> showed close behavior to those of electrolyte materials, it was estimated that La_<0.6>Sr_<0.4>Co_<1-y>Ga_yO_<3-δ> had high potential for new cathode materials. Prototype fuel cell employing La_<1-x>Sr_xGa_<1-y>Mg_yO_<3-δ>, La_<0.6>Sr_<0.4>Co_<1-y>Ga_yO_<3-δ> and Ni as electrolyte, cathode and anode, respectively, was developed and its property was estimated. We have succeeded in operation of the prototype cell at 600℃.
We also analyzed property of La_<1-x>Ca_xCrO_<3-δ> as interconnectior under various gas atmospheres and revealed that the generation of oxide ion vacancy at temperatures more than 700℃ under reduction atmosphere caused the reduction expansion, which could be thermodynamically explained by ideal solution model. It was concluded that increase of electrical conductivity at less than 600℃ was necessary for application of La_<1-x>Ca_xCrO_<3-δ> as an interconector. Less

Report

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

    (9 results)

All 2005 2004 Other

All Journal Article (6 results) Publications (3 results)

  • [Journal Article] Electrical conductivity and crystal structure of Ba_2In_2O_5 at high temperatures under various oxygen partial pressures.2005

    • Author(s)
      M.Yoshinaga et al.
    • Journal Title

      Journal of the Electrochemical Society (in press)

    • 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] Electrical conductivity and crystal structure of Ba_2In_2O_5 at high temperatures under various oxygen partial pressure.2005

    • Author(s)
      M.Yoshinaga et al.
    • Journal Title

      Journal of the Electrochemical Society (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Crystal structure and phase transition behavior of La_<1-x>Sr_xGa_<1-y>Mg_yO_<3-δ>.2004

    • Author(s)
      T.Shibasaki et al.
    • Journal Title

      Solid State Ionics 174

      Pages: 193-203

    • 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] Preparation, thermal expansion and electrical conductivity of La_<0.6>Sr_<0.4>Co_<1-x>Ga_xO3_<3-δ> (x=0.0-0.4) as a new cathode material of SOFC2004

    • Author(s)
      S.Wang et al.
    • Journal Title

      Solid State Ionics 174

      Pages: 157-162

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Preparation, thermal expansion and electrical conductivity of La_<0.6>Sr_<0.4>Co_<1-x>Ga_xO_<3-δ> (x=0.0-0.4) as a new cathode material of SOFC2004

    • Author(s)
      S.Wang et al.
    • Journal Title

      Solid State Ionics 174

      Pages: 157-162

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Preparation, thermal expansion and electrical conductivity of La_<0.6>Sr_<0.4>Co_<1-x>Ga_xO_<3-δ>(x=0.0-0.4) as a new cathode material of SOFC2004

    • Author(s)
      S.Wang et al.
    • Journal Title

      Solid State Ionics 174

      Pages: 157-162

    • Related Report
      2004 Annual Research Report
  • [Publications] S.Wang et al.: "Structural Analysis of Ce_<1-x>MxO_<2-0.5x-δ> (M=Gd,Sm,Y) by High Temperature XRD under Various Oxygen Partial Pressures"Journal of the Electrochemical Society. 151・2. E46-E50 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] S.Wang et al.: "Expansion Behavior of Ce_<1-y>Gd_yO_<2.0-0.5y-δ> under Various Oxygen Partial Pressures Evaluated by HTXRD"Journal of the Electrochemical Society. 150・7. A952-A958 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Yoshinaga et al.: "The electrical conductivity and structural phase transitions of cation-substituted Ba_2In_2O_5"Solid State Ionics. in press. (2004)

    • Related Report
      2003 Annual Research Report

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

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