Cubic-tetragonal phase transformation of YSZ electrolyte in SOFCs

T. Shimonosono, H. Kishimoto, M. Nishi, M. E. Brito, K. Yamaji, H. Yokokawa, T. Horita

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

In view of long term reliability of SOFCs, the prediction of voltage degradation is essential. In yttria-stabilized zirconia (YSZ) generally adopted as electrolyte, the degradation of electrical conductivity is known to be caused by the phase transformation of the cubic to the tetragonal phase over the long term of several thousand hours. Using model YSZ electrolyte under SOFC operating condition, we have so far examined the parameters dominating the behavior of phase transformation. We clarified that the acceleration of phase transformation was caused by the dissolution of NiO into YSZ electrolyte and the following formation of low oxygen potential in YSZ electrolyte, and that the acceleration was significantly suppressed with decreasing temperature. Based on such effects on the phase transformation, we tried to predict the conductivity degradation due to phase transformation of electrolyte during long term operation.

Original languageEnglish
Title of host publicationECS Transactions
PublisherElectrochemical Society Inc.
Pages627-634
Number of pages8
Volume57
Edition1
DOIs
Publication statusPublished - 2013
Externally publishedYes

Fingerprint

Yttria stabilized zirconia
Solid oxide fuel cells (SOFC)
Phase transitions
Electrolytes
Degradation
Dissolution
Oxygen
Electric potential
Temperature

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Shimonosono, T., Kishimoto, H., Nishi, M., Brito, M. E., Yamaji, K., Yokokawa, H., & Horita, T. (2013). Cubic-tetragonal phase transformation of YSZ electrolyte in SOFCs. In ECS Transactions (1 ed., Vol. 57, pp. 627-634). Electrochemical Society Inc.. https://doi.org/10.1149/05701.0627ecst

Cubic-tetragonal phase transformation of YSZ electrolyte in SOFCs. / Shimonosono, T.; Kishimoto, H.; Nishi, M.; Brito, M. E.; Yamaji, K.; Yokokawa, H.; Horita, T.

ECS Transactions. Vol. 57 1. ed. Electrochemical Society Inc., 2013. p. 627-634.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Shimonosono, T, Kishimoto, H, Nishi, M, Brito, ME, Yamaji, K, Yokokawa, H & Horita, T 2013, Cubic-tetragonal phase transformation of YSZ electrolyte in SOFCs. in ECS Transactions. 1 edn, vol. 57, Electrochemical Society Inc., pp. 627-634. https://doi.org/10.1149/05701.0627ecst
Shimonosono T, Kishimoto H, Nishi M, Brito ME, Yamaji K, Yokokawa H et al. Cubic-tetragonal phase transformation of YSZ electrolyte in SOFCs. In ECS Transactions. 1 ed. Vol. 57. Electrochemical Society Inc. 2013. p. 627-634 https://doi.org/10.1149/05701.0627ecst
Shimonosono, T. ; Kishimoto, H. ; Nishi, M. ; Brito, M. E. ; Yamaji, K. ; Yokokawa, H. ; Horita, T. / Cubic-tetragonal phase transformation of YSZ electrolyte in SOFCs. ECS Transactions. Vol. 57 1. ed. Electrochemical Society Inc., 2013. pp. 627-634
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