An Ag-Coated NiO Cathode for MCFCs Operating at Low Temperatures
- An Ag-Coated NiO Cathode for MCFCs Operating at Low Temperatures
- 송신애; 강민구; 한종희; 윤성필; 남석우; 오인환; 최대기
- Issue Date
- Journal of the Electrochemical Society
- VOL 158, NO 6, B660-B666
- To increase the lifetime of molten carbonate fuel cell (MCFC) stacks, a reduction of the operating temperature is needed without
decreasing the cell performance. In this study, a Ag coating on a conventional NiO cathode material of MCFC was carried out to
enhance the cathode performance at the relatively low operating temperature of 600 C. Ag is a material applicable to cathodes for
MCFCs because Ag has good catalytic activity for oxygen adsorption and dissociation and high electrical conductivity. The modified
cathode was prepared by a vacuum suction method using a nanosized Ag sol suspension, and Ag particles were dispersed
homogenously on the surface of a porous Ni plate. After the Ag coating, the cell performance was enhanced significantly from
0.76 to 0.80 V at a 150 mA/cm2 current density at 600 C. The electrochemical impedance spectra show that the reduction of the
charge transfer resistance is the main reason for the improvement of the cell performance after the Ag coating.
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