Overall conductivity and electromotive force of SrZr0:9Yb0:1O3–acell system supplied with moist CH4

Satoshi Fukada, Shigenori Suemori, Ken Onoda

Research output: Contribution to journalArticle

Abstract

A proton-conducting ceramic cell for recovering tritium from process streams was investigated for its application to a fusion reactor system. The ceramic cell tested here was composed of a SrZr0:9Yb0.1O3–atube, one end of which was closed, and Ni/SiO2and NiO/SiO2porous electrodes. Its anode was supplied with moist CH4or H2and its cathode with moist O2. All of the j-V curves obtained by a direct-current method were correlated to the relation V = E 0− jd/σ at 600–700°C regardless of the two different conditions of the CH4+ H2O and H2+ H2O supply. The rate-controlling step of charged hydrogen ion transfer was determined from the dependences of the overall conductivity σ and the electromotive force E 0on the anode H2O partial pressure and temperature. The E 0value under the condition of the CH4+ H2O supply was affected by the diffusion of reaction products of CH4+ H2O = CO + 3H2through the porous anode. On the other hand, the σ value was limited by the oxygen reduction rate at the cathode interface between the ceramic and the Ni electrode regardless of the different conditions between CH4+ H2O and H2+ H2O. These results were consistent with our results obtained by an alternating-current method. The activation energy of the overall conductivity was 60 kJ/mol.

Original languageEnglish
Pages (from-to)1324-1329
Number of pages6
Journaljournal of nuclear science and technology
Volume44
Issue number10
DOIs
Publication statusPublished - Oct 2007

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Electromotive force
electromotive forces
Anodes
anodes
ceramics
conductivity
Cathodes
cathodes
Electrodes
electrodes
fusion reactors
Fusion reactors
Tritium
hydrogen ions
tritium
cells
Reaction products
reaction products
Partial pressure
partial pressure

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering

Cite this

Overall conductivity and electromotive force of SrZr0:9Yb0:1O3–acell system supplied with moist CH4. / Fukada, Satoshi; Suemori, Shigenori; Onoda, Ken.

In: journal of nuclear science and technology, Vol. 44, No. 10, 10.2007, p. 1324-1329.

Research output: Contribution to journalArticle

Fukada, Satoshi ; Suemori, Shigenori ; Onoda, Ken. / Overall conductivity and electromotive force of SrZr0:9Yb0:1O3–acell system supplied with moist CH4. In: journal of nuclear science and technology. 2007 ; Vol. 44, No. 10. pp. 1324-1329.
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