Degradation of hydration kinetics of proton-conducting Ba(Zr0.84Y0.15Cu0.01)O3−δ during conductivity-relaxation experiment

Sung Min Choi, Jong Heun Lee, Jongsup Hong, Kyung Joong Yoon, Ji Won Son, Byung Kook Kim, Hae Weon Lee, Jong Ho Lee

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The chemical-diffusion and surface-exchange coefficients of a proton-conducting oxide, i.e., Ba(Zr0.84Y0.15Cu0.01)O3−δ upon a sudden change of water-vapor pressure at a fixed oxygen partial pressure are investigated via a conductivity relaxation technique. Conductivity relaxation during the hydration/dehydration process follows typical two-fold non-monotonic behavior that can be explained by decoupled chemical diffusion of H and O. However, the temperature dependence of the measured chemical-diffusion and surface-exchange coefficients is significantly different depending on the direction of the temperature change. In this study, we attempt to identify the origin of these unusual behaviors during the conductivity relaxation experiment via thorough microstructural and compositional analyses on sample surface.

Original languageEnglish
Pages (from-to)299-304
Number of pages6
JournalJournal of Power Sources
Volume332
DOIs
Publication statusPublished - 2016 Nov 15

Keywords

  • Degradation of surface kinetics
  • Electrical conductivity relaxation
  • Hydration kinetic
  • Proton conducting oxide
  • Surface contamination

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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