Electrochemical properties of A-site deficient SOFC cathodes under Cr poisoning conditions

C. J. Fu; K. N. Sun; X. B. Chen; N. Q. Zhang; D. R. Zhou

doi:10.1016/j.electacta.2009.07.055

Electrochemical properties of A-site deficient SOFC cathodes under Cr poisoning conditions

C. J. Fu
, K. N. Sun^*
, X. B. Chen
, N. Q. Zhang
, D. R. Zhou

^*Corresponding author for this work

Harbin Institute of Technology

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

31 Citations (Scopus)

Abstract

Under solid oxide fuel cells (SOFCs) operating atmosphere, volatile Cr species are generated over the chromia scale of chromia-forming alloy interconnects, poisoning the cathodes and causing the rapid degradation of the fuel cell performance. In this study, the influence of the cathode composition and A-site deficiency of Perovskite ABO₃ cathodes on their tolerance to Cr poisoning was investigated in detail through the electrochemical polarization and electrochemical impedance spectroscopy (EIS) analysis. Results showed that 5 mol% La-site deficient cathodes, La_0.75Sr_0.2BO_3-δ (B = Mn, Fe), presented a good performance in resistance to Cr poisoning and electrocatalytic activity to oxygen reduction reaction in the presence of alloy interconnects under a constant current density of 0.2 A cm^-2 in oxygen at 1073 K. B-site atom of Perovskite ABO₃ cathodes has a strong influence on the mechanism of Cr deposition and cathodes performance, while proper A-site deficiency can greatly improve the cathodes electrochemical performance and slow down Cr deposition.

Original language	English
Pages (from-to)	7305-7312
Number of pages	8
Journal	Electrochimica Acta
Volume	54
Issue number	28
DOIs	https://doi.org/10.1016/j.electacta.2009.07.055
Publication status	Published - 1 Dec 2009
Externally published	Yes

Keywords

Alloy interconnects
Cathode
Cr-tolerance
Electrochemical performance
SOFC

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10.1016/j.electacta.2009.07.055

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title = "Electrochemical properties of A-site deficient SOFC cathodes under Cr poisoning conditions",

abstract = "Under solid oxide fuel cells (SOFCs) operating atmosphere, volatile Cr species are generated over the chromia scale of chromia-forming alloy interconnects, poisoning the cathodes and causing the rapid degradation of the fuel cell performance. In this study, the influence of the cathode composition and A-site deficiency of Perovskite ABO3 cathodes on their tolerance to Cr poisoning was investigated in detail through the electrochemical polarization and electrochemical impedance spectroscopy (EIS) analysis. Results showed that 5 mol\% La-site deficient cathodes, La0.75Sr0.2BO3-δ (B = Mn, Fe), presented a good performance in resistance to Cr poisoning and electrocatalytic activity to oxygen reduction reaction in the presence of alloy interconnects under a constant current density of 0.2 A cm-2 in oxygen at 1073 K. B-site atom of Perovskite ABO3 cathodes has a strong influence on the mechanism of Cr deposition and cathodes performance, while proper A-site deficiency can greatly improve the cathodes electrochemical performance and slow down Cr deposition.",

keywords = "Alloy interconnects, Cathode, Cr-tolerance, Electrochemical performance, SOFC",

author = "Fu, \{C. J.\} and Sun, \{K. N.\} and Chen, \{X. B.\} and Zhang, \{N. Q.\} and Zhou, \{D. R.\}",

year = "2009",

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doi = "10.1016/j.electacta.2009.07.055",

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journal = "Electrochimica Acta",

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TY - JOUR

T1 - Electrochemical properties of A-site deficient SOFC cathodes under Cr poisoning conditions

AU - Fu, C. J.

AU - Sun, K. N.

AU - Chen, X. B.

AU - Zhang, N. Q.

AU - Zhou, D. R.

PY - 2009/12/1

Y1 - 2009/12/1

N2 - Under solid oxide fuel cells (SOFCs) operating atmosphere, volatile Cr species are generated over the chromia scale of chromia-forming alloy interconnects, poisoning the cathodes and causing the rapid degradation of the fuel cell performance. In this study, the influence of the cathode composition and A-site deficiency of Perovskite ABO3 cathodes on their tolerance to Cr poisoning was investigated in detail through the electrochemical polarization and electrochemical impedance spectroscopy (EIS) analysis. Results showed that 5 mol% La-site deficient cathodes, La0.75Sr0.2BO3-δ (B = Mn, Fe), presented a good performance in resistance to Cr poisoning and electrocatalytic activity to oxygen reduction reaction in the presence of alloy interconnects under a constant current density of 0.2 A cm-2 in oxygen at 1073 K. B-site atom of Perovskite ABO3 cathodes has a strong influence on the mechanism of Cr deposition and cathodes performance, while proper A-site deficiency can greatly improve the cathodes electrochemical performance and slow down Cr deposition.

AB - Under solid oxide fuel cells (SOFCs) operating atmosphere, volatile Cr species are generated over the chromia scale of chromia-forming alloy interconnects, poisoning the cathodes and causing the rapid degradation of the fuel cell performance. In this study, the influence of the cathode composition and A-site deficiency of Perovskite ABO3 cathodes on their tolerance to Cr poisoning was investigated in detail through the electrochemical polarization and electrochemical impedance spectroscopy (EIS) analysis. Results showed that 5 mol% La-site deficient cathodes, La0.75Sr0.2BO3-δ (B = Mn, Fe), presented a good performance in resistance to Cr poisoning and electrocatalytic activity to oxygen reduction reaction in the presence of alloy interconnects under a constant current density of 0.2 A cm-2 in oxygen at 1073 K. B-site atom of Perovskite ABO3 cathodes has a strong influence on the mechanism of Cr deposition and cathodes performance, while proper A-site deficiency can greatly improve the cathodes electrochemical performance and slow down Cr deposition.

KW - Alloy interconnects

KW - Cathode

KW - Cr-tolerance

KW - Electrochemical performance

KW - SOFC

UR - https://www.scopus.com/pages/publications/70349492137

U2 - 10.1016/j.electacta.2009.07.055

DO - 10.1016/j.electacta.2009.07.055

M3 - Article

AN - SCOPUS:70349492137

SN - 0013-4686

VL - 54

SP - 7305

EP - 7312

JO - Electrochimica Acta

JF - Electrochimica Acta

IS - 28

ER -

Electrochemical properties of A-site deficient SOFC cathodes under Cr poisoning conditions

Abstract

Keywords

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