Preparation and evaluation of Ca3-xBixCo4O9-delta (0 < x <= 0.5) as novel cathodes for intermediate temperature-solid oxide fuel cells
SCIE
SCOPUS
- Title
- Preparation and evaluation of Ca3-xBixCo4O9-delta (0 < x <= 0.5) as novel cathodes for intermediate temperature-solid oxide fuel cells
- Authors
- Zou, J; Park, J; Yoon, H; Kim, T; Chung, J
- Date Issued
- 2012-05
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Abstract
- The misfit compounds Ca3-xBixCo4O9-delta (x = 0.1-0.5) were successfully synthesized via conventional solid state reaction and evaluated as cathode materials for intermediate temperature-solid oxide fuel cells. The powders were characterized by X-ray diffraction, scanning emission microscopy, X-ray photoelectron spectroscopy, thermogravimetry analysis and oxygen-temperature programmed desorption. The monoclinic Ca3-xBixCo4O9-delta powders exhibit good thermal stability and chemical compatibility with Ce0.8Sm0.2O2-gamma electrolyte. Among the investigated single-phase samples, Ca2.9Bi0.1Co4O9-delta shows the maximal conductivity of 655.9 S cm(-1) and higher catalytic activity compared with other Ca3-xBixCo4O9-delta compositions. Ca2.9Bi0.1Co4O9-delta also shows the best cathodic performance and its cathode polarization resistance can be further decreased by incorporating 30 wt.% Ce0.8Sm0.2O2-gamma. The maximal power densities of the NiO/Ce0.8Sm0.2O2-gamma anode-supported button cells fabricated with the Ce0.8Sm0.2O2-gamma electrolyte and Ca2.9Bi0.1Co4O9-delta + 30 wt.% Ce0.8Sm0.2O2-gamma cathode reach 430 and 320 mW cm(-2) at 700 and 650 degrees C respectively. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
- Keywords
- Intermediate temperature-solid oxide fuel cell (IT-SOFC); Ca3-xBixCo4O9-delta cathode materials; Oxygen nonstoichiometry; O-2-temperature programmed desorption (O-2-TPD); Cathode polarization resistance (R-p); Electrochemical performance; THERMOELECTRIC PROPERTIES; ELECTRICAL-PROPERTIES; STABILIZED ZIRCONIA; DOPED CERIA; PERFORMANCE; ELECTROLYTE; CA3CO4O9; SYSTEM; LAYER; SOFCS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/15612
- DOI
- 10.1016/J.IJHYDENE.2012.02.132
- ISSN
- 0360-3199
- Article Type
- Article
- Citation
- INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, vol. 37, no. 10, page. 8592 - 8602, 2012-05
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