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Title: A highly active, CO2-tolerant electrode for the oxygen reduction reaction

Journal Article · · Energy & Environmental Science
DOI:https://doi.org/10.1039/c8ee01140k· OSTI ID:1540042

One challenge facing the development of high-performance cathodes for solid oxide fuel cells (SOFC) is the fast degradation rate of cathodes due to poisoning by contaminants commonly encountered in ambient air such as CO2. In this paper we report a double perovskite PrBa0.8Ca0.2Co2O5+δ (PBCC) cathode with excellent ORR activity and remarkable CO2 tolerance under realistic operation conditions. When tested in a symmetrical cell in air with ~1 vol% CO2 at 750 °C, the PBCC electrode shows an area specific resistance of ~0.024 Ω cm2, which increases to 0.028 Ω cm2 after 1000 h operation. The degradation rate is ~1/24 of that of the state-of-the-art La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) cathode under the same conditions. Impedance spectroscopy and in situ surface enhanced Raman spectroscopy analyses indicate that the surface of the PBCC electrode is much more active for oxygen exchange and more robust against CO2 than that of LSCF, as confirmed by density functional theory calculations. The fast ORR kinetics and excellent durability of PBCC in air with CO2 highlight the potential of PBCC as a highly promising material for devices involving oxygen electrochemistry such as solid oxide fuel cells, electrolysis cells, or gas separation membranes.

Research Organization:
Georgia Institute of Technology, Atlanta, GA (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE); Guangdong Innovative and Entrepreneurial Research Team; USDOE Office of Science (SC)
Grant/Contract Number:
FE0009652; FE0026106; AC02-05CH11231; 2014ZT05N200; FC FE0026106; FC-FE0009652
OSTI ID:
1540042
Alternate ID(s):
OSTI ID: 1456258
Journal Information:
Energy & Environmental Science, Vol. 11, Issue 9; ISSN 1754-5692
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 165 works
Citation information provided by
Web of Science

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