Song, Shin Ae Jang, Seong-Cheol Han, Jonghee Yoon, Sung Pil Nam, Suk Woo Oh, In-Hwan Lim, Tae-Hoon 2024-01-20T15:35:06Z 2024-01-20T15:35:06Z 2021-09-05 2011-12-01 0378-7753 https://pubs.kist.re.kr/handle/201004/129727 To enhance cathode performance, gadolinium strontium cobaltite (Gd(0.6)Sr(0.4)CoO(3), 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 degrees 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 O(2) and CO(2) 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. (C) 2011 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY OXYGEN REDUCTION COMPOSITE CATHODES TEMPERATURE ELECTRODES ELECTROLYTES DISSOLUTION OPERATION NIO Enhancement of cell performance using a gadolinium strontium cobaltite coated cathode in molten carbonate fuel cells Article 10.1016/j.jpowsour.2011.08.032 1 JOURNAL OF POWER SOURCES, v.196, no.23, pp.9900 - 9905 JOURNAL OF POWER SOURCES 196 23 9900 9905 scie scopus 000296216600008 2-s2.0-80053574589 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY OXYGEN REDUCTION COMPOSITE CATHODES TEMPERATURE ELECTRODES ELECTROLYTES DISSOLUTION OPERATION NIO Molten carbonate fuel cells Gadolinium strontium cobaltite coated cathode High performance Reduction of cathode polarization