Characterization and electrochemical performance of (Ba{sub 0.6}Sr{sub 0.4}){sub 1-x}La{sub x}Co{sub 0.6}Fe{sub 0.4}O{sub 3-{delta}} (x = 0, 0.1) cathode for intermediate temperature solid oxide fuel cells
Journal Article
·
· Materials Research Bulletin
- Department of Materials Science and Engineering, Nanjing University of Science and Technology, No. 200 Xiaolingwei Street, Nanjing, Jiangsu 210094 (China)
La-doped Ba{sub 0.6}Sr{sub 0.4}Co{sub 0.6}Fe{sub 0.4}O{sub 3-{delta}} perovskites were synthesized and investigated as new cathode material for intermediate temperature solid oxide fuel cells (IT-SOFCs). The structural characteristics, thermal expansion coefficient (TEC), electrical conductivity and electrochemical properties were characterized by X-ray diffraction (XRD), dilatometry, DC four-terminal method, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) techniques. The TEC of (Ba{sub 0.6}Sr{sub 0.4}){sub 0.9}La{sub 0.1}Co{sub 0.4}Fe{sub 0.6}O{sub 3-{delta}} (BSLCF) was 14.9 x 10{sup -6} K{sup -1} at 30-800 {sup o}C, lower than Ba{sub 0.6}Sr{sub 0.4}Co{sub 0.4}Fe{sub 0.6}O{sub 3-{delta}} (BSCF) of 15.6 x 10{sup -6} K{sup -1}. The electrical conductivity of BSCF was improved by La-doping, e.g. a value of 122 S cm{sup -1} for BSLCF vs. 52 S cm{sup -1} for BSCF at 500{sup o}C, respectively. In addition, La-doping enhanced the electrochemical activity for oxygen reduction reaction. The polarization resistance of BSLCF was 0.18 {Omega} cm{sup 2} at 700 {sup o}C, about a quarter lower than that of BSCF. The improved electrochemical performance of BSLCF should be ascribed to the higher conductivity as well as the improved oxygen adsorption/desorption and oxygen ions diffusion processes.
- OSTI ID:
- 22207386
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 9 Vol. 45; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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