Enhancement of cell performance using a gadolinium strontium cobaltite coated cathode in molten carbonate fuel cells

Title
Enhancement of cell performance using a gadolinium strontium cobaltite coated cathode in molten carbonate fuel cells
Authors
송신애장성철한종희윤성필남석우오인환임태훈
Keywords
Molten catbonate fuel cells; Gadolium strontium cobatite coated cathode; High performance; Reduction of cathode polarization
Issue Date
2011-11
Publisher
Journal of power sources
Citation
VOL 196, NO 23, 9900-9905
Abstract
To enhance cathode performance, gadolinium strontium cobaltite (Gd0.6Sr0.4CoO3, GSC) is coated onto a porous Ni plate by a vacuum suction method, for use as the cathode in molten carbonate fuel cells (MCFCs). GSC is a mixed ionic and electronic conductor (MIEC) material, and thus has high electronic conductivity and catalytic activity at low temperatures. The electrode performance of the GSC-coated cathode is examined by various methods, such as single cell operation and electrochemical impedance spectroscopy (EIS). At 600 ◦C, the performance of a single cell using a GSC-coated cathode is 0.813 V. This result is very surprising given that the performance of an uncoated conventional cathode is 0.69 V. Impedance analysis confirms that a dramatic decrease in the charge transfer resistance after GSC coating is primarily responsible for the cell enhancement at low temperature. The reaction orders for O2 and CO2 at uncoated and GSC-coated cathodes are also examined via a symmetric cell test, to identify the reaction mechanism of oxygen reduction. The peroxide mechanism, which is known to be a fast reaction, is predominant for the GSC-coated cathode at low temperatures, whereas the superoxide mechanism is predominant for the uncoated cathode.
URI
http://pubs.kist.re.kr/handle/201004/42207
ISSN
0378-7753
Appears in Collections:
KIST Publication > Article
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