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Gigantic enhancement of the dielectric permittivity in wet yttrium-doped barium cerate

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Abstract

Water behavior studies were performed in porous ceramic media based on proton conducting yttrium-doped barium cerate BaCe0.85Y0.15O3-α (BCY15), which is a component of a new high-temperature dual membrane fuel cell (dmFC) design. Complex permittivity measurements were carried out on porous samples at room temperature. A new phenomenon was observed during wetting—a gigantic enhancement of the real component of the capacitance at lower frequencies. A possible explanation is the formation of semi-liquid layer with dipole structure on the pores walls, which is supposed to be organized also at operating temperatures. Since the electrochemically active volumetric layer facilitates the water formation, it should improve the operation of the dmFC by decreasing its resistance, which is experimentally confirmed. This phenomenon can be of importance also for classical proton conducting solid oxide fuel cells, as well as for operation in electrolyzer mode.

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Acknowledgments

The research leading to these results has received funding from the European Community’s Seventh Framework Programme (FP7/2007-2013) under grant agreement no 213389. Powders were fabricated and supplied by Marion Technologies (Fr). The authors would like to thank Prof. Alain Thorel and Dr. Anthony Chesnaud from ARMINES (Fr) for the preparation of the investigated samples and the fruitful discussions.

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Authors and Affiliations

  1. Institute of Electrochemistry and Energy Systems, Bulgarian Academy of Sciences, 10 Acad. G. Bonchev, 1113, Sofia, Bulgaria

    Zdravko B. Stoynov, Daria E. Vladikova & Emiliya A. Mladenova

Authors
  1. Zdravko B. Stoynov
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  2. Daria E. Vladikova
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  3. Emiliya A. Mladenova
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Corresponding author

Correspondence to Daria E. Vladikova.

Additional information

With this paper, we would like to thank Prof. Alexander Milchev for the long-term scientific and personal friendship, enriched with numerous professional discussions, which has helped us to go deeper into the impedance studies of the underpotential deposition of Ag, as well as in the processes of water vapor formation and growth in solid oxide fuel cells

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Stoynov, Z.B., Vladikova, D.E. & Mladenova, E.A. Gigantic enhancement of the dielectric permittivity in wet yttrium-doped barium cerate. J Solid State Electrochem 17, 555–560 (2013). https://doi.org/10.1007/s10008-012-1916-z

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  • DOI: https://doi.org/10.1007/s10008-012-1916-z

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