Comprehensive Hypotheses for Degradation Mechanisms in Ni-Stabilized Zirconia Electrodes

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Abstract

Degradation of nickel-stabilized zirconia (Ni-SZ) electrodes is predominantly due to four features 1) high mobility of Ni, 2) fragile nature of SZ ceramics, 3) narrow three phase boundary (3PB), and 4) effects of impurities: i) in blocking (poisoning of 3PB), and ii) on mobility of Ni. Impurities may be contaminants in reactant gases and influenced by the reactants H2O, CO2 and CO, or impurities in cell and stack materials. Examples of important degradation types and hypotheses of the degradation mechanisms are described. Examples are: a) loss of electrochemical contact between Ni and YSZ (yttria stabilized zirconia) particles and loss of contact between Ni-Ni particles followed by Ni-migration away from the YSZ electrolyte - one reason is hypothesized being a result of huge potential and thermal gradients at the 3PB; b) growth of Ni-particles; c) redoxing; d) blocking of 3PB and reaction sites by impurities like Si and S. Mitigation methods are discussed.
Original languageEnglish
JournalECS Transactions
Volume91
Issue number1
Pages (from-to)613-620
Number of pages8
ISSN1938-5862
DOIs
Publication statusPublished - 2019

Cite this

@article{fdc7125c6a814b289a716d988eb1f6f5,
title = "Comprehensive Hypotheses for Degradation Mechanisms in Ni-Stabilized Zirconia Electrodes",
abstract = "Degradation of nickel-stabilized zirconia (Ni-SZ) electrodes is predominantly due to four features 1) high mobility of Ni, 2) fragile nature of SZ ceramics, 3) narrow three phase boundary (3PB), and 4) effects of impurities: i) in blocking (poisoning of 3PB), and ii) on mobility of Ni. Impurities may be contaminants in reactant gases and influenced by the reactants H2O, CO2 and CO, or impurities in cell and stack materials. Examples of important degradation types and hypotheses of the degradation mechanisms are described. Examples are: a) loss of electrochemical contact between Ni and YSZ (yttria stabilized zirconia) particles and loss of contact between Ni-Ni particles followed by Ni-migration away from the YSZ electrolyte - one reason is hypothesized being a result of huge potential and thermal gradients at the 3PB; b) growth of Ni-particles; c) redoxing; d) blocking of 3PB and reaction sites by impurities like Si and S. Mitigation methods are discussed.",
author = "Mogensen, {Mogens Bjerg} and Ming Chen and Frandsen, {Henrik Lund} and Graves, {Christopher R.} and Anne Hauch and Torben Jacobsen and Jensen, {S{\o}ren H{\o}jgaard} and Skafte, {Theis L{\o}ye} and Xiufu Sun",
year = "2019",
doi = "10.1149/09101.0613ecst",
language = "English",
volume = "91",
pages = "613--620",
journal = "E C S Transactions",
issn = "1938-5862",
publisher = "The Electrochemical Society",
number = "1",

}

TY - JOUR

T1 - Comprehensive Hypotheses for Degradation Mechanisms in Ni-Stabilized Zirconia Electrodes

AU - Mogensen, Mogens Bjerg

AU - Chen, Ming

AU - Frandsen, Henrik Lund

AU - Graves, Christopher R.

AU - Hauch, Anne

AU - Jacobsen, Torben

AU - Jensen, Søren Højgaard

AU - Skafte, Theis Løye

AU - Sun, Xiufu

PY - 2019

Y1 - 2019

N2 - Degradation of nickel-stabilized zirconia (Ni-SZ) electrodes is predominantly due to four features 1) high mobility of Ni, 2) fragile nature of SZ ceramics, 3) narrow three phase boundary (3PB), and 4) effects of impurities: i) in blocking (poisoning of 3PB), and ii) on mobility of Ni. Impurities may be contaminants in reactant gases and influenced by the reactants H2O, CO2 and CO, or impurities in cell and stack materials. Examples of important degradation types and hypotheses of the degradation mechanisms are described. Examples are: a) loss of electrochemical contact between Ni and YSZ (yttria stabilized zirconia) particles and loss of contact between Ni-Ni particles followed by Ni-migration away from the YSZ electrolyte - one reason is hypothesized being a result of huge potential and thermal gradients at the 3PB; b) growth of Ni-particles; c) redoxing; d) blocking of 3PB and reaction sites by impurities like Si and S. Mitigation methods are discussed.

AB - Degradation of nickel-stabilized zirconia (Ni-SZ) electrodes is predominantly due to four features 1) high mobility of Ni, 2) fragile nature of SZ ceramics, 3) narrow three phase boundary (3PB), and 4) effects of impurities: i) in blocking (poisoning of 3PB), and ii) on mobility of Ni. Impurities may be contaminants in reactant gases and influenced by the reactants H2O, CO2 and CO, or impurities in cell and stack materials. Examples of important degradation types and hypotheses of the degradation mechanisms are described. Examples are: a) loss of electrochemical contact between Ni and YSZ (yttria stabilized zirconia) particles and loss of contact between Ni-Ni particles followed by Ni-migration away from the YSZ electrolyte - one reason is hypothesized being a result of huge potential and thermal gradients at the 3PB; b) growth of Ni-particles; c) redoxing; d) blocking of 3PB and reaction sites by impurities like Si and S. Mitigation methods are discussed.

U2 - 10.1149/09101.0613ecst

DO - 10.1149/09101.0613ecst

M3 - Journal article

VL - 91

SP - 613

EP - 620

JO - E C S Transactions

JF - E C S Transactions

SN - 1938-5862

IS - 1

ER -