An improved oxygen reduction reaction activity and CO2-tolerance of La0.6Sr0.4Co0.2Fe0.8O3-δ achieved by a surface modification with barium cobaltite coatings
- South China Univ. of Technology, Guangzhou (China); Georgia Inst. of Technology, Atlanta, GA (United States)
- Georgia Inst. of Technology, Atlanta, GA (United States)
- South China Univ. of Technology, Guangzhou (China)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- National Yang Ming Chiao Tung Univ., Tainan (Taiwan)
Solid oxide fuel cells (SOFCs) cathode often suffers from the poisoning effect of the contaminants commonly encountered in air such as CO2. Here we report an effective approach to enhancing the activity and CO2 tolerance of the state-of-the-art La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathode enabled by a coating of BaCoO3-δ (BCO), as verified by the electrochemical testings, Raman analyses, and density functional theory calculations. When surface modified with a thin-film BCO coating, LSCF displays a much enhanced ORR activity and an improved durability against CO2. For example, anode supported SOFCs with the LSCF cathode coated with BCO coatings show a remarkable peak power density (Pmax) of 0.41 Wcm-2 and a significantly reduced degradation rate in current density of ~0.08% h-1 at 0.8 V and 700 °C for a period of 300 hs when humidified H2 (with 3 vol%H2O) was used as fuel and air with 8 vol% CO2 as oxidant. The demonstrated performance is improved when compared with those of the cells with a blank LSCF electrode (a Pmax of ~0.36 Wcm-2 and a degradation rate of ~0.15% h-1) under the same conditions. Furthermore, the adsorption energy calculations suggests that BCO coating makes CO2 adsorption much weaker than LSCF (-0.54 eV versus -1.07 eV).
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Fuel Cell Technologies Program; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office; Ministry of Science and Technology of Taiwan (MOST); National Natural Science Foundation of China (NSFC); Natural Science Foundation of Guangdong Province; Pearl River Talent Recruitment Program; Fundamental Research Funds for the Central Universities; China Postdoctoral Science Foundation
- Grant/Contract Number:
- SC0012704; 22005105; 22179039; 2021A1515010395; 2019QN01C693; 2020ZYGXZR009; 110-2221-E-A49-017-MY3; FE0026106; FE0009652
- OSTI ID:
- 1830350
- Report Number(s):
- BNL-222410-2021-JAAM
- Journal Information:
- Journal of Power Sources, Vol. 514; ISSN 0378-7753
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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