Kang, Min Goo Park, Hyun S. Ham, Hyung Chul Jang, Seong-Cheol Yoon, Chang Won Han, Jonghee Nam, Suk Woo Kim, Sung Hyun Yoon, Sung Pil 2024-01-20T04:03:25Z 2024-01-20T04:03:25Z 2021-09-03 2016-06 0013-4651 https://pubs.kist.re.kr/handle/201004/124031 Electrolyte properties are significantly important for the long-term stability and performance of molten carbonate fuel cells (MCFCs). The Li/Na carbonate is considered an attractive electrolyte for MCFCs due to its high ionic conductivity and low volatility. However, low oxygen solubility is a serious drawback in Li/Na carbonate electrolytes, which hinders the oxygen reduction reaction (ORR) at the MCFC cathode. Several additives have been found to enhance the oxygen solubility in alkali carbonate electrolytes. In this study, the effect of Cs2CO3 in Li/Na and Li/K carbonate mixtures was investigated by cyclic voltammetry and electrochemical impedance spectroscopy. The oxygen reduction activity improved with the increasing Cs concentration (1, 3, and 5 mol%) in all the studied carbonate melts. The addition of Cs2CO3 (5 mol%) to the Li/Na carbonate (68.0/32.0) resulted in an approximately 30% increase of the mass transfer parameter (C-0 root D-0) of the dissolved oxygen species from 0.99 x 10(-9) to 1.29 x 10(-9) mol/cm(2) s(1/2) at 620 degrees C. The changes in the ionic conductivity of the molten electrolytes with the Cs additive were also studied. (C) 2016 The Electrochemical Society. All rights reserved. English ELECTROCHEMICAL SOC INC FUEL-CELL ELECTRODES ALKALI MOLTEN-CARBONATE PRESSURIZED CONDITIONS LI2CO3/NA2CO3 ELECTROLYTE ELECTRICAL-CONDUCTIVITY LITHIUM-CARBONATE SODIUM-CARBONATE NIO CATHODE SOLUBILITY PERFORMANCE Effect of Cs2CO3 in Li/K and Li/Na Carbonate on the Oxygen Reduction Reaction for MCFC Article 10.1149/2.0061609jes 1 JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.163, no.8, pp.F962 - F967 JOURNAL OF THE ELECTROCHEMICAL SOCIETY 163 8 F962 F967 scie scopus 000379688000115 2-s2.0-84978066466 Electrochemistry Materials Science, Coatings & Films Electrochemistry Materials Science Article FUEL-CELL ELECTRODES ALKALI MOLTEN-CARBONATE PRESSURIZED CONDITIONS LI2CO3/NA2CO3 ELECTROLYTE ELECTRICAL-CONDUCTIVITY LITHIUM-CARBONATE SODIUM-CARBONATE NIO CATHODE SOLUBILITY PERFORMANCE fuel cell oxygen reduction reaction molten carbonate electrochemistry