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1999 Fiscal Year Final Research Report Summary

Development of Ultra High-Temperature Oxide Proton Conductive Solid Electrolyte

Research Project

Project/Area Number 09450278
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Metal making engineering
Research InstitutionNagoya Institute of Technology

Principal Investigator

FUKATSU Norihiko  Nagoya Institute of Technology, Faculty of Engineering, Associate Professor., 工学部, 助教授 (80029355)

Co-Investigator(Kenkyū-buntansha) OHASHI Teruo  Nagoya Institute of Technology, Faculty of Engineering, Professor., 工学部, 教授 (70024263)
KURITA Noriaki  Nagoya Institute of Technology, Faculty of Engineering, Research Associate., 工学部, 助手 (20292401)
Project Period (FY) 1997 – 1999
Keywordsalumina / hydrogen solubility / proton conduction / solid electrolyte / IR absorption / isotope effect / hydrogen sensor / electrical conductivity
Research Abstract

The defect structure of the conventional proton conductor CaZrO3(+In) in the high temperature region was studied in detail at first. According to the results, a new method to compensate the effect of the oxide ion conduction, which become remarkable in higher temperature range, was developed. The prototype hydrogen sensor system designed adopting this method was made and tested in the laboratory and the practical plant. The high performance of the system as the monitoring tool for the metal melting process was confirmed.
In order to find the proton conductor usable in higher temperatures, the behavior of hydrogen in the single crystal of magnesium aluminate spinel was studied. From the existence of OH stretching vibration observed in the IR absorption spectrum, the dissolution of hydrogen into the alumina-rich spinel as the type of proton was ascertained. The chemical diffusion coefficient of hydrogen determined from the dissolution rate was found far smaller than those of conventional … More perobskite-type proton conductors. As the H/D isotope effect in the electrical conductivity was not observed, it was confirmed that the contribution of the movement of the dissolved proton to the electrical conduction was very small.
From the consideration on the curious phenomena observed concerning the extra high hydrogen solubility of molten aluminum, the possibility of alumina-base proton.conductor was suggested. Therefore, the hydrogen dissolution into the single crystal of Mg-doped alpha alumina was studied extensively. From the result of IR absorption, hydrogen was confirmed to dissolve as a movable proton. A clear H/D isotope effect was observed in the electrical conductivity measurement. And the predominancy of the proton conduction was ascertained. Using Mg doped sintered polycrystalline alumina, the proton transport number was determined by EMF method. The determined value in hydrogen atmosphere was more than 0.5 even at the temperature l473K.It was found that Mg-doped alpha alumina was the best material as a proton conducting solid electrolyte for high temperature use. The performance of the hydrogen sensor using this electrolyte was also tested and good results were obtained. Less

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 栗田典明 他: "プロトン導電性固体電解質を用いた溶融銅中の水素活量の連続測定"資源と素材. 113. 45-51 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Fukatsu et al.: "Hydrogen sensor for molten metals usable up to 1500K"Solid State Ionics. 113-115. 219-227 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Fukatsu et al.: "Role of the Oxide Film formed on the Surface of Molten Aluminum as a Membrane for Chemical Pumping of Hydrogen"Electrochemistry. 68. 709-712 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 武津典彦,栗田典明: "α-アルミナ中の水素の化学拡散"固体イオニクス研究会資料. 26. 28-40 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 栗田典明 他: "α-Al_2O_3中のプロトン伝導"固体イオニクス討論会講演要旨集. 26. 190-191 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Fukatsu et al.: "Incorporation of Hydrogen into Magnesium Aluminate Spinel"International Conference on Solid State Ionics, SSI 2001. (in press).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Noriaki KURITA, Norihiko FUKATSU, Akira NAITO, Kunihiro KOIDE and Teruo OHASHI: "The Continuous Measurement of Hydrogen Activities in Molten Copper using Proton-Conductive Solid Electrolyte"Shigen-to-Sozai. Vol.113. 45-51 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Norihiko FUKATSU, Noriaki KURITA, Kunihiro KOIDE and Teruo OHASHI: "Hydrogen sensor for molten metals usable up to 1500K"Solid State Ionics. Vol.113-115. 219-227 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Norihiko FUKATSU, Noriaki KURITA, Naoyuki ISHIHARA, Nariyuki. OKABAYASHI and Teruo. OHASHI: "Role of the Oxide Film formed on the Surface of Molten Aluminum as a Membrane for Chemical Pumping of Hydrogen"Electrochemistry. Vol.68. 709-712 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Norihiko FUKATSU and Noriaki KURITA: "Chemical Diffusion of Hydrogen in Alpha Alumina"Proceedings of Symposium of Solid State Ionics Society of Japan. Vol.26. 28-40 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Noriaki KURITA, Norihiko FUKATSU, Teruo OHASHI, Shingo YAMAMOTO and Yuichirou OKA: "Protonic Conduction in Alpha Alumina"Extended Abstract of the Symposium on Solid Ionics in Japan. Vol.26. 190-191 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Norihiko FUKATSU, Noriaki KURITA, Hiroyuki SHIGA, Yasuto MURAI and Teruo OHASHI: "Incorporation of Hydrogen into Magnesium Aluminate Spinel"International Conference on Solid State Ionics, SSI 2001. (to be published).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2002-03-26  

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