Fundamental Study on the Electrodes for Alkali Metal Thermoelectric Converter: (2nd Report, Impedance measurement and generating characteristics)

Kotaro Tanaka, Akira Negishi, Ken Nozaki, Toshihisa Masuda

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A. C. impedance measurement on the alkali metal thermoelectric converter (AMTEC) has been conducted under D. C. polarized conditions in the temperature range from 890-1 123 K. The obtained data have been analyzed in the complex impedance plane in terms of an equivalent circuit for the AMTEC system. The charge transfer resistance at the interface between the beta˝-alumina solid electrolyte (BASE) and porous molybdenum electrodes has been evaluated and approximated by the introduced electrochemical model. The calculated current-voltage curves including the effect of the charge transfer resistance show good agreement with the measured data. The generating characteristics of the AMTEC can be completely predicted by this method, which may be useful for further studies on more efficient AMTEC cells. The contributions of BASE ionic conduction, contact resistance and mass transport through the porous electrode are also discussed.

Original languageEnglish
Pages (from-to)4229-4234
Number of pages6
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Issue number544
Publication statusPublished - 1991 Jan 1



  • Direct Energy Conversion
  • Heat Engine
  • Solid Electrolyte
  • Thermal Engineering Equipment
  • Thermoelectric Conversion

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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