Kim, JD Kim, GD Moon, JW Park, YI Lee, WH Kobayashi, K Nagai, M Kim, CE 2024-01-21T12:09:30Z 2024-01-21T12:09:30Z 2021-09-05 2001-07 0167-2738 https://pubs.kist.re.kr/handle/201004/140370 The characteristics of La1-xSrxMnO3 perovskite (LSM)-yttria-stabilized zirconia (YSZ) composite electrodes were studied over a range of compositions by ac impedance spectroscopy. The transfer and surface diffusion of oxygen ions were found to be rate-determining steps. The polarization resistance of oxygen ion transfer was found to be independent of the partial pressure of oxygen and proportional to the length of the three-phase boundary. The capacitance of oxygen ion transfer was approximately 10(-4) F/cm(2). The polarization resistance of O- surface diffusion was determined to be proportional to P-O2(1/4), with a minimum at 40-50 wt.% YSZ. The polarization resistance of oxygen ion transfer was observed to remain largely unaffected by variations in cathodic potential, whereas that of O- surface diffusion decreased with increasing cathodic potential, At low partial oxygen pressure, the arc due to gas phase diffusion was observed in the low frequency region, with proportion to P-O2 and having low activation energy. (C) 2001 Elsevier Science B.V. All rights reserved. English ELSEVIER SCIENCE BV OXIDE FUEL-CELLS AIR ELECTRODE CATHODES KINETICS ZIRCONIA LA0.6CA0.4MNO3/YSZ MICROSTRUCTURE LAMNO3 SOFC Characterization of LSM-YSZ composite electrode by ac impedance spectroscopy Article 10.1016/S0167-2738(01)00877-3 1 SOLID STATE IONICS, v.143, no.3-4, pp.379 - 389 SOLID STATE IONICS 143 3-4 379 389 scie scopus 000170244200011 2-s2.0-0035796221 Chemistry, Physical Physics, Condensed Matter Chemistry Physics Article OXIDE FUEL-CELLS AIR ELECTRODE CATHODES KINETICS ZIRCONIA LA0.6CA0.4MNO3/YSZ MICROSTRUCTURE LAMNO3 SOFC LSM-YSZ composite electrode O- surface diffusion oxygen ion transfer gas phase diffusion