Instability and growth of nanoscale Ce0.8Gd0.2O1.9/NiO infiltrate in Sr0.94Ti0.9Nb0.1O3-Zr0.84Y0.16O1.92 anodes for solid oxide fuel cells

Wei Zhang; Luise Theil Kuhn; Peter Stanley Jørgensen; Bhaskar Reddy Sudireddy; Janet Jonna Bentzen; Carlos Bernuy-Lopez; Sune Veltzé; Tania Ramos

doi:10.1016/j.jpowsour.2014.02.051

Instability and growth of nanoscale Ce_0.8Gd_0.2O_1.9/NiO infiltrate in Sr_0.94Ti_0.9Nb_0.1O₃-Zr_0.84Y_0.16O_1.92 anodes for solid oxide fuel cells

Wei Zhang, Luise Theil Kuhn, Peter Stanley Jørgensen, Bhaskar Reddy Sudireddy, Janet Jonna Bentzen, Carlos Bernuy-Lopez, Sune Veltzé, Tania Ramos

Department of Energy Conversion and Storage

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Abstract

Microstructural evolution of Ce0.8Gd0.2O 1.9/NiO (CGO/NiO) co-infiltrated nanoparticles in Sr 0.94Ti0.9Nb0.1O3-Zr 0.84Y0.16O1.92 (STN94-YSZ) anodes for solid oxide fuel cells (SOFCs) is investigated during electrochemical testing in a symmetric cell setup. The CGO/NiO infiltrated symmetric cells were subjected to varying atmospheres of H2O/H2 between 650 and 850 C and characterized by electrochemical impedance spectroscopy. Analytical high resolution transmission electron microscopy showed that the CGO/NiO infiltrate was found to coalesce and grow from an indistinguishable CGO/NiO fluorite structure of an average diameter of 5 nm to individual well-connected, but phase-separated, CGO and Ni particles of 50 nm in average. This study confirms that instability and growth of CGO/NiO infiltrates in STN-based SOFC electrodes affect the morphology and can potentially be linked to reported losses in electrochemical performance. © 2014 Elsevier B.V. All rights reserved.

Original language	English
Journal	Journal of Power Sources
Volume	258
Pages (from-to)	297-304
ISSN	0378-7753
DOIs	https://doi.org/10.1016/j.jpowsour.2014.02.051
Publication status	Published - 2014

Keywords

SOFC
Anodes
Infiltrate
Gd-doped ceria
Nickel
Instability

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10.1016/j.jpowsour.2014.02.051

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@article{4af26f2614b1400bb0c2a1eb1a73c0d7,

title = "Instability and growth of nanoscale Ce0.8Gd0.2O1.9/NiO infiltrate in Sr0.94Ti0.9Nb0.1O3-Zr0.84Y0.16O1.92 anodes for solid oxide fuel cells",

abstract = "Microstructural evolution of Ce0.8Gd0.2O 1.9/NiO (CGO/NiO) co-infiltrated nanoparticles in Sr 0.94Ti0.9Nb0.1O3-Zr 0.84Y0.16O1.92 (STN94-YSZ) anodes for solid oxide fuel cells (SOFCs) is investigated during electrochemical testing in a symmetric cell setup. The CGO/NiO infiltrated symmetric cells were subjected to varying atmospheres of H2O/H2 between 650 and 850 C and characterized by electrochemical impedance spectroscopy. Analytical high resolution transmission electron microscopy showed that the CGO/NiO infiltrate was found to coalesce and grow from an indistinguishable CGO/NiO fluorite structure of an average diameter of 5 nm to individual well-connected, but phase-separated, CGO and Ni particles of 50 nm in average. This study confirms that instability and growth of CGO/NiO infiltrates in STN-based SOFC electrodes affect the morphology and can potentially be linked to reported losses in electrochemical performance. {\textcopyright} 2014 Elsevier B.V. All rights reserved.",

keywords = "SOFC, Anodes, Infiltrate, Gd-doped ceria, Nickel, Instability",

author = "Wei Zhang and Kuhn, {Luise Theil} and J{\o}rgensen, {Peter Stanley} and Sudireddy, {Bhaskar Reddy} and Bentzen, {Janet Jonna} and Carlos Bernuy-Lopez and Sune Veltz{\'e} and Tania Ramos",

year = "2014",

doi = "10.1016/j.jpowsour.2014.02.051",

language = "English",

volume = "258",

pages = "297--304",

journal = "Journal of Power Sources",

issn = "0378-7753",

publisher = "Elsevier",

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AU - Zhang, Wei

AU - Kuhn, Luise Theil

AU - Jørgensen, Peter Stanley

AU - Sudireddy, Bhaskar Reddy

AU - Bentzen, Janet Jonna

AU - Bernuy-Lopez, Carlos

AU - Veltzé, Sune

AU - Ramos, Tania

PY - 2014

Y1 - 2014

N2 - Microstructural evolution of Ce0.8Gd0.2O 1.9/NiO (CGO/NiO) co-infiltrated nanoparticles in Sr 0.94Ti0.9Nb0.1O3-Zr 0.84Y0.16O1.92 (STN94-YSZ) anodes for solid oxide fuel cells (SOFCs) is investigated during electrochemical testing in a symmetric cell setup. The CGO/NiO infiltrated symmetric cells were subjected to varying atmospheres of H2O/H2 between 650 and 850 C and characterized by electrochemical impedance spectroscopy. Analytical high resolution transmission electron microscopy showed that the CGO/NiO infiltrate was found to coalesce and grow from an indistinguishable CGO/NiO fluorite structure of an average diameter of 5 nm to individual well-connected, but phase-separated, CGO and Ni particles of 50 nm in average. This study confirms that instability and growth of CGO/NiO infiltrates in STN-based SOFC electrodes affect the morphology and can potentially be linked to reported losses in electrochemical performance. © 2014 Elsevier B.V. All rights reserved.

AB - Microstructural evolution of Ce0.8Gd0.2O 1.9/NiO (CGO/NiO) co-infiltrated nanoparticles in Sr 0.94Ti0.9Nb0.1O3-Zr 0.84Y0.16O1.92 (STN94-YSZ) anodes for solid oxide fuel cells (SOFCs) is investigated during electrochemical testing in a symmetric cell setup. The CGO/NiO infiltrated symmetric cells were subjected to varying atmospheres of H2O/H2 between 650 and 850 C and characterized by electrochemical impedance spectroscopy. Analytical high resolution transmission electron microscopy showed that the CGO/NiO infiltrate was found to coalesce and grow from an indistinguishable CGO/NiO fluorite structure of an average diameter of 5 nm to individual well-connected, but phase-separated, CGO and Ni particles of 50 nm in average. This study confirms that instability and growth of CGO/NiO infiltrates in STN-based SOFC electrodes affect the morphology and can potentially be linked to reported losses in electrochemical performance. © 2014 Elsevier B.V. All rights reserved.

KW - SOFC

KW - Anodes

KW - Infiltrate

KW - Gd-doped ceria

KW - Nickel

KW - Instability

U2 - 10.1016/j.jpowsour.2014.02.051

DO - 10.1016/j.jpowsour.2014.02.051

M3 - Journal article

SN - 0378-7753

VL - 258

SP - 297

EP - 304

JO - Journal of Power Sources

JF - Journal of Power Sources

ER -