Surface modifications of nano-structured cathodes to enhance durability of intermediate temperature solid oxide fuel cells

Yeting Wen; Tianrang Yang; Dongkyu Lee; Ho Nyung Lee; Ethan J. Crumlin; Kevin Huang

doi:10.1149/09101.1263ecst

Surface modifications of nano-structured cathodes to enhance durability of intermediate temperature solid oxide fuel cells

Yeting Wen, Tianrang Yang, Dongkyu Lee, Ho Nyung Lee, Ethan J. Crumlin, Kevin Huang

Materials Science and Technology Div

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

1 Scopus citations

Abstract

The bulk-to-surface Sr-segregation can seriously compromise the stability of oxygen electrocatalysis in Sr-doped perovskite oxides such as La_1-xSr_xCoO_3-δ and La_1-xSr_xCo_1-yFe_yO_3-δ and limit their practical applications as cathode materials in solid oxide fuel cells. This work aims to acquire fundamental knowledge of Sr-segregation process under practical conditions in solid oxide fuel cells and develop suppression method to ensure the long-term stability through surface modifications. In this work, the pristine and ZrO₂ atomic layer deposition (ALD) modified La_0.6Sr_0.4CoO_3-δ (LSCo) epitaxial films were used as the model systems to investigate how the temperature, time and surface coating affect the surface concentration of Sr via in situ synchrotron-based ambient pressure XPS. This information was also correlated with their electrochemical performances characterized by electrochemical impedance spectroscopy. We also report a Sr-segregation-free SrCo_0.9Ta_0.1O_3-δ (SCT) multifunctional coating on a benchmark cathode LSCF as a means of enhancing ORR activity and durability against Cr-poison.

Original language	English
Title of host publication	Solid Oxide Fuel Cells 16, SOFC 2019
Editors	K. Eguchi, S. C. Singhal
Publisher	Electrochemical Society Inc.
Pages	1263-1272
Number of pages	10
Edition	1
ISBN (Electronic)	9781607688747, 9781607688747
DOIs	https://doi.org/10.1149/09101.1263ecst
State	Published - 2019
Event	16th International Symposium on Solid Oxide Fuel Cells, SOFC 2019 - Kyoto, Japan Duration: Sep 8 2019 → Sep 13 2019

Publication series

Name	ECS Transactions
Number	1
Volume	91
ISSN (Print)	1938-6737
ISSN (Electronic)	1938-5862

Conference

Conference	16th International Symposium on Solid Oxide Fuel Cells, SOFC 2019
Country/Territory	Japan
City	Kyoto
Period	09/8/19 → 09/13/19

Funding

This work was funded by the Advanced Research Projects Agency-Energy (ARPA-E), U.S. Department of Energy, under award number DE-AR0000492 and Office of Fossil Energy, U.S. Department of Energy, under award number DE-FE-0023317, and National Science Foundation, under award number of DMR-1464112.

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10.1149/09101.1263ecst

Cite this

Wen, Y., Yang, T., Lee, D., Lee, H. N., Crumlin, E. J., & Huang, K. (2019). Surface modifications of nano-structured cathodes to enhance durability of intermediate temperature solid oxide fuel cells. In K. Eguchi, & S. C. Singhal (Eds.), Solid Oxide Fuel Cells 16, SOFC 2019 (1 ed., pp. 1263-1272). (ECS Transactions; Vol. 91, No. 1). Electrochemical Society Inc.. https://doi.org/10.1149/09101.1263ecst

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title = "Surface modifications of nano-structured cathodes to enhance durability of intermediate temperature solid oxide fuel cells",

abstract = "The bulk-to-surface Sr-segregation can seriously compromise the stability of oxygen electrocatalysis in Sr-doped perovskite oxides such as La1-xSrxCoO3-δ and La1-xSrxCo1-yFeyO3-δ and limit their practical applications as cathode materials in solid oxide fuel cells. This work aims to acquire fundamental knowledge of Sr-segregation process under practical conditions in solid oxide fuel cells and develop suppression method to ensure the long-term stability through surface modifications. In this work, the pristine and ZrO2 atomic layer deposition (ALD) modified La0.6Sr0.4CoO3-δ (LSCo) epitaxial films were used as the model systems to investigate how the temperature, time and surface coating affect the surface concentration of Sr via in situ synchrotron-based ambient pressure XPS. This information was also correlated with their electrochemical performances characterized by electrochemical impedance spectroscopy. We also report a Sr-segregation-free SrCo0.9Ta0.1O3-δ (SCT) multifunctional coating on a benchmark cathode LSCF as a means of enhancing ORR activity and durability against Cr-poison.",

author = "Yeting Wen and Tianrang Yang and Dongkyu Lee and Lee, {Ho Nyung} and Crumlin, {Ethan J.} and Kevin Huang",

note = "Publisher Copyright: {\textcopyright} The Electrochemical Society.; 16th International Symposium on Solid Oxide Fuel Cells, SOFC 2019 ; Conference date: 08-09-2019 Through 13-09-2019",

year = "2019",

doi = "10.1149/09101.1263ecst",

language = "English",

series = "ECS Transactions",

publisher = "Electrochemical Society Inc.",

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Wen, Y, Yang, T, Lee, D, Lee, HN, Crumlin, EJ & Huang, K 2019, Surface modifications of nano-structured cathodes to enhance durability of intermediate temperature solid oxide fuel cells. in K Eguchi & SC Singhal (eds), Solid Oxide Fuel Cells 16, SOFC 2019. 1 edn, ECS Transactions, no. 1, vol. 91, Electrochemical Society Inc., pp. 1263-1272, 16th International Symposium on Solid Oxide Fuel Cells, SOFC 2019, Kyoto, Japan, 09/8/19. https://doi.org/10.1149/09101.1263ecst

Surface modifications of nano-structured cathodes to enhance durability of intermediate temperature solid oxide fuel cells. / Wen, Yeting; Yang, Tianrang; Lee, Dongkyu et al.
Solid Oxide Fuel Cells 16, SOFC 2019. ed. / K. Eguchi; S. C. Singhal. 1. ed. Electrochemical Society Inc., 2019. p. 1263-1272 (ECS Transactions; Vol. 91, No. 1).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Surface modifications of nano-structured cathodes to enhance durability of intermediate temperature solid oxide fuel cells

AU - Wen, Yeting

AU - Yang, Tianrang

AU - Lee, Dongkyu

AU - Lee, Ho Nyung

AU - Crumlin, Ethan J.

AU - Huang, Kevin

PY - 2019

Y1 - 2019

N2 - The bulk-to-surface Sr-segregation can seriously compromise the stability of oxygen electrocatalysis in Sr-doped perovskite oxides such as La1-xSrxCoO3-δ and La1-xSrxCo1-yFeyO3-δ and limit their practical applications as cathode materials in solid oxide fuel cells. This work aims to acquire fundamental knowledge of Sr-segregation process under practical conditions in solid oxide fuel cells and develop suppression method to ensure the long-term stability through surface modifications. In this work, the pristine and ZrO2 atomic layer deposition (ALD) modified La0.6Sr0.4CoO3-δ (LSCo) epitaxial films were used as the model systems to investigate how the temperature, time and surface coating affect the surface concentration of Sr via in situ synchrotron-based ambient pressure XPS. This information was also correlated with their electrochemical performances characterized by electrochemical impedance spectroscopy. We also report a Sr-segregation-free SrCo0.9Ta0.1O3-δ (SCT) multifunctional coating on a benchmark cathode LSCF as a means of enhancing ORR activity and durability against Cr-poison.

AB - The bulk-to-surface Sr-segregation can seriously compromise the stability of oxygen electrocatalysis in Sr-doped perovskite oxides such as La1-xSrxCoO3-δ and La1-xSrxCo1-yFeyO3-δ and limit their practical applications as cathode materials in solid oxide fuel cells. This work aims to acquire fundamental knowledge of Sr-segregation process under practical conditions in solid oxide fuel cells and develop suppression method to ensure the long-term stability through surface modifications. In this work, the pristine and ZrO2 atomic layer deposition (ALD) modified La0.6Sr0.4CoO3-δ (LSCo) epitaxial films were used as the model systems to investigate how the temperature, time and surface coating affect the surface concentration of Sr via in situ synchrotron-based ambient pressure XPS. This information was also correlated with their electrochemical performances characterized by electrochemical impedance spectroscopy. We also report a Sr-segregation-free SrCo0.9Ta0.1O3-δ (SCT) multifunctional coating on a benchmark cathode LSCF as a means of enhancing ORR activity and durability against Cr-poison.

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U2 - 10.1149/09101.1263ecst

DO - 10.1149/09101.1263ecst

M3 - Conference contribution

AN - SCOPUS:85073219655

T3 - ECS Transactions

SP - 1263

EP - 1272

BT - Solid Oxide Fuel Cells 16, SOFC 2019

A2 - Eguchi, K.

A2 - Singhal, S. C.

PB - Electrochemical Society Inc.

T2 - 16th International Symposium on Solid Oxide Fuel Cells, SOFC 2019

Y2 - 8 September 2019 through 13 September 2019

ER -

Surface modifications of nano-structured cathodes to enhance durability of intermediate temperature solid oxide fuel cells

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