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

doi:10.1016/j.jpowsour.2016.09.129

Degradation of hydration kinetics of proton-conducting Ba(Zr_0.84Y_0.15Cu_0.01)O_3−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 journal › Article › peer-review

4 Citations (Scopus)

Abstract

The chemical-diffusion and surface-exchange coefficients of a proton-conducting oxide, i.e., Ba(Zr_0.84Y_0.15Cu_0.01)O_3−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 language	English
Pages (from-to)	299-304
Number of pages	6
Journal	Journal of Power Sources
Volume	332
DOIs	https://doi.org/10.1016/j.jpowsour.2016.09.129
Publication status	Published - 2016 Nov 15

Bibliographical note

Publisher Copyright:
© 2016 Elsevier B.V.

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

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.jpowsour.2016.09.129

Cite this

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

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.",

keywords = "Degradation of surface kinetics, Electrical conductivity relaxation, Hydration kinetic, Proton conducting oxide, Surface contamination",

author = "Choi, {Sung Min} and Lee, {Jong Heun} and Jongsup Hong and Yoon, {Kyung Joong} and Son, {Ji Won} and Kim, {Byung Kook} and Lee, {Hae Weon} and Lee, {Jong Ho}",

note = "Publisher Copyright: {\textcopyright} 2016 Elsevier B.V.",

year = "2016",

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doi = "10.1016/j.jpowsour.2016.09.129",

language = "English",

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journal = "Journal of Power Sources",

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T1 - Degradation of hydration kinetics of proton-conducting Ba(Zr0.84Y0.15Cu0.01)O3−δ during conductivity-relaxation experiment

AU - Choi, Sung Min

AU - Lee, Jong Heun

AU - Hong, Jongsup

AU - Yoon, Kyung Joong

AU - Son, Ji Won

AU - Kim, Byung Kook

AU - Lee, Hae Weon

AU - Lee, Jong Ho

PY - 2016/11/15

Y1 - 2016/11/15

N2 - 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.

AB - 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.

KW - Degradation of surface kinetics

KW - Electrical conductivity relaxation

KW - Hydration kinetic

KW - Proton conducting oxide

KW - Surface contamination

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U2 - 10.1016/j.jpowsour.2016.09.129

DO - 10.1016/j.jpowsour.2016.09.129

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SN - 0378-7753

VL - 332

SP - 299

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JO - Journal of Power Sources

JF - Journal of Power Sources

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