Effect of polarization on Sr and Zr diffusion behavior in LSCF/GDC/YSZ system

Fangfang Wang; Manuel E. Brito; Katsuhiko Yamaji; Do Hyung Cho; Mina Nishi; Haruo Kishimoto; Teruhisa Horita; Harumi Yokokawa

doi:10.1016/j.ssi.2014.04.002

Effect of polarization on Sr and Zr diffusion behavior in LSCF/GDC/YSZ system

Fangfang Wang, Manuel E. Brito, Katsuhiko Yamaji, Do Hyung Cho, Mina Nishi, Haruo Kishimoto, Teruhisa Horita, Harumi Yokokawa

Department of System Design Engineering

Research output: Contribution to journal › Article › peer-review

62 Citations (Scopus)

Abstract

To accurately evaluate the role as diffusion barrier of gadolinia-doped ceria (GDC) interlayer, often used in real stacks of solid oxide fuel cells, the cation diffusion behavior in a LSCF/GDC/YSZ system was investigated. Diffusion under open circuit voltage (OCV) and cathodic polarization conditions was evaluated using pellet-type cells in which a dense GDC interlayer, about 1 μm in thickness, was prepared by pulse laser deposition (PLD). Results clearly show that under polarization, SrZrO₃ formation along both LSCF/GDC and GDC/YSZ interfaces is accelerated. The enhancement of Sr diffusion during cathodic polarization is explained by a shift to higher values of the thermodynamic activity of Sr at the LSCF/GDC interface that also leads to a decrease in oxygen potential.

Original language	English
Pages (from-to)	454-459
Number of pages	6
Journal	Solid State Ionics
Volume	262
DOIs	https://doi.org/10.1016/j.ssi.2014.04.002
Publication status	Published - 2014 Sep 1

Keywords

10GDC interlayer
OCV and polarization
Solid oxide fuel cell (SOFC)
Sr and Zr diffusion

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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title = "Effect of polarization on Sr and Zr diffusion behavior in LSCF/GDC/YSZ system",

abstract = "To accurately evaluate the role as diffusion barrier of gadolinia-doped ceria (GDC) interlayer, often used in real stacks of solid oxide fuel cells, the cation diffusion behavior in a LSCF/GDC/YSZ system was investigated. Diffusion under open circuit voltage (OCV) and cathodic polarization conditions was evaluated using pellet-type cells in which a dense GDC interlayer, about 1 μm in thickness, was prepared by pulse laser deposition (PLD). Results clearly show that under polarization, SrZrO3 formation along both LSCF/GDC and GDC/YSZ interfaces is accelerated. The enhancement of Sr diffusion during cathodic polarization is explained by a shift to higher values of the thermodynamic activity of Sr at the LSCF/GDC interface that also leads to a decrease in oxygen potential.",

keywords = "10GDC interlayer, OCV and polarization, Solid oxide fuel cell (SOFC), Sr and Zr diffusion",

author = "Fangfang Wang and Brito, {Manuel E.} and Katsuhiko Yamaji and Cho, {Do Hyung} and Mina Nishi and Haruo Kishimoto and Teruhisa Horita and Harumi Yokokawa",

year = "2014",

month = sep,

day = "1",

doi = "10.1016/j.ssi.2014.04.002",

language = "English",

volume = "262",

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journal = "Solid State Ionics",

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TY - JOUR

T1 - Effect of polarization on Sr and Zr diffusion behavior in LSCF/GDC/YSZ system

AU - Wang, Fangfang

AU - Brito, Manuel E.

AU - Yamaji, Katsuhiko

AU - Cho, Do Hyung

AU - Nishi, Mina

AU - Kishimoto, Haruo

AU - Horita, Teruhisa

AU - Yokokawa, Harumi

PY - 2014/9/1

Y1 - 2014/9/1

N2 - To accurately evaluate the role as diffusion barrier of gadolinia-doped ceria (GDC) interlayer, often used in real stacks of solid oxide fuel cells, the cation diffusion behavior in a LSCF/GDC/YSZ system was investigated. Diffusion under open circuit voltage (OCV) and cathodic polarization conditions was evaluated using pellet-type cells in which a dense GDC interlayer, about 1 μm in thickness, was prepared by pulse laser deposition (PLD). Results clearly show that under polarization, SrZrO3 formation along both LSCF/GDC and GDC/YSZ interfaces is accelerated. The enhancement of Sr diffusion during cathodic polarization is explained by a shift to higher values of the thermodynamic activity of Sr at the LSCF/GDC interface that also leads to a decrease in oxygen potential.

AB - To accurately evaluate the role as diffusion barrier of gadolinia-doped ceria (GDC) interlayer, often used in real stacks of solid oxide fuel cells, the cation diffusion behavior in a LSCF/GDC/YSZ system was investigated. Diffusion under open circuit voltage (OCV) and cathodic polarization conditions was evaluated using pellet-type cells in which a dense GDC interlayer, about 1 μm in thickness, was prepared by pulse laser deposition (PLD). Results clearly show that under polarization, SrZrO3 formation along both LSCF/GDC and GDC/YSZ interfaces is accelerated. The enhancement of Sr diffusion during cathodic polarization is explained by a shift to higher values of the thermodynamic activity of Sr at the LSCF/GDC interface that also leads to a decrease in oxygen potential.

KW - 10GDC interlayer

KW - OCV and polarization

KW - Solid oxide fuel cell (SOFC)

KW - Sr and Zr diffusion

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EP - 459

JO - Solid State Ionics

JF - Solid State Ionics

SN - 0167-2738

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