TY - JOUR
T1 - Enhancement of cell performance using a gadolinium strontium cobaltite coated cathode in molten carbonate fuel cells
AU - Song, Shin Ae
AU - Jang, Seong Cheol
AU - Han, Jonghee
AU - Yoon, Sung Pil
AU - Nam, Suk Woo
AU - Oh, In Hwan
AU - Lim, Tae Hoon
N1 - Funding Information:
This research was supported by a New & Renewable Energy of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) Grant funded by the Korean government Ministry of Knowledge Economy (Project No. 2008-NFC12J0431102010).
PY - 2011/12/1
Y1 - 2011/12/1
N2 - To enhance cathode performance, gadolinium strontium cobaltite (Gd 0.6Sr0.4CoO3, 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.
AB - To enhance cathode performance, gadolinium strontium cobaltite (Gd 0.6Sr0.4CoO3, 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.
KW - Gadolinium strontium cobaltite coated cathode
KW - High performance
KW - Molten carbonate fuel cells
KW - Reduction of cathode polarization
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U2 - 10.1016/j.jpowsour.2011.08.032
DO - 10.1016/j.jpowsour.2011.08.032
M3 - Article
AN - SCOPUS:80053574589
SN - 0378-7753
VL - 196
SP - 9900
EP - 9905
JO - Journal of Power Sources
JF - Journal of Power Sources
IS - 23
ER -