Abstract
Oxygen solubility is the rate-determining step (RDS) for the reduction reaction on the cathodes of molten carbonate fuel cells (MCFCs), especially at low operating temperatures below 600°C. The poor wetting property of the mixed ionic and electronic conductor (MIEC) coating, such as BYS (Bi1.5Y0.3Sm0.2O3-δ) on the NiO cathode, to the liquid electrolyte creates openings where oxygen absorption and dissociation take place to providemore oxide ionic species to electrochemical reaction sites (ERSs). Therefore, poor wetting MIEC-coated cells showed a much higher power density compared to standard cells, with a factor of 1.4 at the low operating temperature of 550°C. Long-term operation of 2500 hours with a low voltage loss of 9 mV suggests that BYS is a promising alternative cathode material for molten carbonate fuel cells.
Original language | English |
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Pages (from-to) | F1458-F1467 |
Journal | Journal of the Electrochemical Society |
Volume | 161 |
Issue number | 14 |
DOIs | |
Publication status | Published - 2014 |
Bibliographical note
Publisher Copyright:© The Author(s) 2014.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
- Electrochemistry
- Materials Chemistry