Performance-Microstructure Relations in Ni/CGO Infiltrated Nb-doped SrTiO3 SOFC Anodes

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

doi:10.1149/1.3701330

Performance-Microstructure Relations in Ni/CGO Infiltrated Nb-doped SrTiO3 SOFC Anodes

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

Department of Energy Conversion and Storage

Research output: Contribution to journal › Conference article › Research › peer-review

Abstract

Nb-doped SrTiO3 solid oxide fuel cell (SOFC) anodes, infiltrated with CGO/Ni, were investigated by electrochemical impedance spectroscopy (EIS) and high resolution microscopy techniques, upon varying production and testing parameters. The electrochemical analysis involved a combination of distribution of relaxation times (DRT) and complex non-linear least squares (CNLS) fitting routine. These electrodes were studied as singlephase or as composites with 8YSZ. Sr0.94Ti0.9Nb0.1O3-δ/ 10 vol.% 8YSZ composite infiltrated electrodes were the best overall performers, with enhanced performance stability under higher steam contents. Combined DRT/CNLS showed the existence of at least three contributing processes to the total polarisation resistance (Rp) of these electrodes. Microstructural changes involving infiltrate growth and redistribution were also confirmed.

Original language	English
Journal	E C S Transactions
Volume	45
Issue number	1
Pages (from-to)	389-402
ISSN	1938-5862
DOIs	https://doi.org/10.1149/1.3701330
Publication status	Published - 2012
Event	221st ECS Meeting - Seattle, WA, United States Duration: 6 May 2012 → 10 May 2012

Conference

Conference	221st ECS Meeting
Country/Territory	United States
City	Seattle, WA
Period	06/05/2012 → 10/05/2012

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title = "Performance-Microstructure Relations in Ni/CGO Infiltrated Nb-doped SrTiO3 SOFC Anodes",

abstract = "Nb-doped SrTiO3 solid oxide fuel cell (SOFC) anodes, infiltrated with CGO/Ni, were investigated by electrochemical impedance spectroscopy (EIS) and high resolution microscopy techniques, upon varying production and testing parameters. The electrochemical analysis involved a combination of distribution of relaxation times (DRT) and complex non-linear least squares (CNLS) fitting routine. These electrodes were studied as singlephase or as composites with 8YSZ. Sr0.94Ti0.9Nb0.1O3-δ/ 10 vol.% 8YSZ composite infiltrated electrodes were the best overall performers, with enhanced performance stability under higher steam contents. Combined DRT/CNLS showed the existence of at least three contributing processes to the total polarisation resistance (Rp) of these electrodes. Microstructural changes involving infiltrate growth and redistribution were also confirmed.",

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

year = "2012",

doi = "10.1149/1.3701330",

language = "English",

volume = "45",

pages = "389--402",

journal = "E C S Transactions",

issn = "1938-5862",

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AU - Ramos, Tania

AU - Bernuy-Lopez, Carlos

AU - Reddy Sudireddy, Bhaskar

AU - Bentzen, Janet Jonna

AU - Zhang, Wei

AU - Jørgensen, Peter Stanley

AU - Kuhn, Luise Theil

PY - 2012

Y1 - 2012

N2 - Nb-doped SrTiO3 solid oxide fuel cell (SOFC) anodes, infiltrated with CGO/Ni, were investigated by electrochemical impedance spectroscopy (EIS) and high resolution microscopy techniques, upon varying production and testing parameters. The electrochemical analysis involved a combination of distribution of relaxation times (DRT) and complex non-linear least squares (CNLS) fitting routine. These electrodes were studied as singlephase or as composites with 8YSZ. Sr0.94Ti0.9Nb0.1O3-δ/ 10 vol.% 8YSZ composite infiltrated electrodes were the best overall performers, with enhanced performance stability under higher steam contents. Combined DRT/CNLS showed the existence of at least three contributing processes to the total polarisation resistance (Rp) of these electrodes. Microstructural changes involving infiltrate growth and redistribution were also confirmed.

AB - Nb-doped SrTiO3 solid oxide fuel cell (SOFC) anodes, infiltrated with CGO/Ni, were investigated by electrochemical impedance spectroscopy (EIS) and high resolution microscopy techniques, upon varying production and testing parameters. The electrochemical analysis involved a combination of distribution of relaxation times (DRT) and complex non-linear least squares (CNLS) fitting routine. These electrodes were studied as singlephase or as composites with 8YSZ. Sr0.94Ti0.9Nb0.1O3-δ/ 10 vol.% 8YSZ composite infiltrated electrodes were the best overall performers, with enhanced performance stability under higher steam contents. Combined DRT/CNLS showed the existence of at least three contributing processes to the total polarisation resistance (Rp) of these electrodes. Microstructural changes involving infiltrate growth and redistribution were also confirmed.

U2 - 10.1149/1.3701330

DO - 10.1149/1.3701330

M3 - Conference article

SN - 1938-5862

VL - 45

SP - 389

EP - 402

JO - E C S Transactions

JF - E C S Transactions

IS - 1

T2 - 221st ECS Meeting

Y2 - 6 May 2012 through 10 May 2012

ER -

Performance-Microstructure Relations in Ni/CGO Infiltrated Nb-doped SrTiO3 SOFC Anodes

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