A new A-site excessive strategy to improve performance of layered perovskite cathode for intermediate-temperature solid oxide fuel cells

Yang Yang; Yonghong Chen; Dong Tian; Xiaoyong Lu; Yanzhi Ding; Weili Yu; Bin Lin

doi:10.1016/j.electacta.2017.02.066

A new A-site excessive strategy to improve performance of layered perovskite cathode for intermediate-temperature solid oxide fuel cells

Yang Yang, Yonghong Chen^*, Dong Tian, Xiaoyong Lu, Yanzhi Ding, Weili Yu, Bin Lin

^*Corresponding author for this work

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

17 Scopus citations

Abstract

A new A-site excessive strategy is reported to improve performance of layered perovskite cathode for intermediate-temperature solid oxide fuel cells (IT-SOFCs). A new A-site excessive Gd_1+xBa_1+xCo₂O_5+δ layered perovskite is investigated as cathode materials for IT-SOFCs. With an excess of A-site content, the crystal lattice and the thermal expansion coefficient increase slightly. The oxygen nonstoichiometry (δ) increases, while the oxygen vacancy decreases by defect chemistry analysis. A-site excessive Gd_1.05Ba_1.05Co₂O_5+δ (GBC1.05) is well compatible with Gd_0.2Ce_0.8O_2-δ at 1000 °C for 10 h. The electrical conductivity of GBC1.05 increases dramatically owing to the higher concentration of electron hole and the lower oxygen vacancy concentration. The electrochemical performance towards oxygen reduction reaction can be enhanced from 0.246 Ω cm² to 0.146 Ω cm² by introducing A-site excessive content of Gd and Ba. Consequently, GBC1.05 cathode exhibits a good cell performance of 830 mW cm⁻² at 800 °C, indicating that A-site excessive Gd_1.05Ba_1.05Co₂O_5+δ layered perovskite is a potential cathode material for IT-SOFCs due to its high electrochemical performance.

Original language	English (US)
Pages (from-to)	686-693
Number of pages	8
Journal	Electrochimica Acta
Volume	231
DOIs	https://doi.org/10.1016/j.electacta.2017.02.066
State	Published - Mar 20 2017
Externally published	Yes

Keywords

A-site excess
Cathode
Layered perovskite
Oxygen reduction reaction
Solid oxide fuel cell

ASJC Scopus subject areas

General Chemical Engineering
Electrochemistry

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10.1016/j.electacta.2017.02.066

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title = "A new A-site excessive strategy to improve performance of layered perovskite cathode for intermediate-temperature solid oxide fuel cells",

abstract = "A new A-site excessive strategy is reported to improve performance of layered perovskite cathode for intermediate-temperature solid oxide fuel cells (IT-SOFCs). A new A-site excessive Gd1+xBa1+xCo2O5+δ layered perovskite is investigated as cathode materials for IT-SOFCs. With an excess of A-site content, the crystal lattice and the thermal expansion coefficient increase slightly. The oxygen nonstoichiometry (δ) increases, while the oxygen vacancy decreases by defect chemistry analysis. A-site excessive Gd1.05Ba1.05Co2O5+δ (GBC1.05) is well compatible with Gd0.2Ce0.8O2-δ at 1000 °C for 10 h. The electrical conductivity of GBC1.05 increases dramatically owing to the higher concentration of electron hole and the lower oxygen vacancy concentration. The electrochemical performance towards oxygen reduction reaction can be enhanced from 0.246 Ω cm2 to 0.146 Ω cm2 by introducing A-site excessive content of Gd and Ba. Consequently, GBC1.05 cathode exhibits a good cell performance of 830 mW cm−2 at 800 °C, indicating that A-site excessive Gd1.05Ba1.05Co2O5+δ layered perovskite is a potential cathode material for IT-SOFCs due to its high electrochemical performance.",

keywords = "A-site excess, Cathode, Layered perovskite, Oxygen reduction reaction, Solid oxide fuel cell",

author = "Yang Yang and Yonghong Chen and Dong Tian and Xiaoyong Lu and Yanzhi Ding and Weili Yu and Bin Lin",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",

year = "2017",

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day = "20",

doi = "10.1016/j.electacta.2017.02.066",

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T1 - A new A-site excessive strategy to improve performance of layered perovskite cathode for intermediate-temperature solid oxide fuel cells

AU - Yang, Yang

AU - Chen, Yonghong

AU - Tian, Dong

AU - Lu, Xiaoyong

AU - Ding, Yanzhi

AU - Yu, Weili

AU - Lin, Bin

PY - 2017/3/20

Y1 - 2017/3/20

N2 - A new A-site excessive strategy is reported to improve performance of layered perovskite cathode for intermediate-temperature solid oxide fuel cells (IT-SOFCs). A new A-site excessive Gd1+xBa1+xCo2O5+δ layered perovskite is investigated as cathode materials for IT-SOFCs. With an excess of A-site content, the crystal lattice and the thermal expansion coefficient increase slightly. The oxygen nonstoichiometry (δ) increases, while the oxygen vacancy decreases by defect chemistry analysis. A-site excessive Gd1.05Ba1.05Co2O5+δ (GBC1.05) is well compatible with Gd0.2Ce0.8O2-δ at 1000 °C for 10 h. The electrical conductivity of GBC1.05 increases dramatically owing to the higher concentration of electron hole and the lower oxygen vacancy concentration. The electrochemical performance towards oxygen reduction reaction can be enhanced from 0.246 Ω cm2 to 0.146 Ω cm2 by introducing A-site excessive content of Gd and Ba. Consequently, GBC1.05 cathode exhibits a good cell performance of 830 mW cm−2 at 800 °C, indicating that A-site excessive Gd1.05Ba1.05Co2O5+δ layered perovskite is a potential cathode material for IT-SOFCs due to its high electrochemical performance.

AB - A new A-site excessive strategy is reported to improve performance of layered perovskite cathode for intermediate-temperature solid oxide fuel cells (IT-SOFCs). A new A-site excessive Gd1+xBa1+xCo2O5+δ layered perovskite is investigated as cathode materials for IT-SOFCs. With an excess of A-site content, the crystal lattice and the thermal expansion coefficient increase slightly. The oxygen nonstoichiometry (δ) increases, while the oxygen vacancy decreases by defect chemistry analysis. A-site excessive Gd1.05Ba1.05Co2O5+δ (GBC1.05) is well compatible with Gd0.2Ce0.8O2-δ at 1000 °C for 10 h. The electrical conductivity of GBC1.05 increases dramatically owing to the higher concentration of electron hole and the lower oxygen vacancy concentration. The electrochemical performance towards oxygen reduction reaction can be enhanced from 0.246 Ω cm2 to 0.146 Ω cm2 by introducing A-site excessive content of Gd and Ba. Consequently, GBC1.05 cathode exhibits a good cell performance of 830 mW cm−2 at 800 °C, indicating that A-site excessive Gd1.05Ba1.05Co2O5+δ layered perovskite is a potential cathode material for IT-SOFCs due to its high electrochemical performance.

KW - A-site excess

KW - Cathode

KW - Layered perovskite

KW - Oxygen reduction reaction

KW - Solid oxide fuel cell

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A new A-site excessive strategy to improve performance of layered perovskite cathode for intermediate-temperature solid oxide fuel cells

Abstract

Keywords

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