Enhancement of cell performance using a gadolinium strontium cobaltite coated cathode in molten carbonate fuel cells
- Enhancement of cell performance using a gadolinium strontium cobaltite coated cathode in molten carbonate fuel cells
- 송신애; 장성철; 한종희; 윤성필; 남석우; 오인환; 임태훈
- Molten catbonate fuel cells; Gadolium strontium cobatite coated cathode; High performance; Reduction of cathode polarization
- Issue Date
- Journal of power sources
- VOL 196, NO 23, 9900-9905
- 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.
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