Kim, Jeonghee Shin, Dongwook Son, Ji-Won Lee, Jong-Ho Kim, Byung-Kook Je, Hae-June Lee, Hae-Weon Yoon, Kyung Joong 2024-01-20T11:03:32Z 2024-01-20T11:03:32Z 2021-09-04 2013-11-01 0378-7753 https://pubs.kist.re.kr/handle/201004/127457 All-ceramic solid oxide fuel cells (SOFCs), which offer advantages in carbon tolerance, sulfur resistance and redox stability, are fabricated and evaluated. The electrolyte-supported cells are composed of a La0.75Sr0.25Cr0.5MnO3-delta (LSCM)-Ce0.9Gd0.1O1.95-delta (GDC) anode, an Y2O3-stabilized ZrO2 (YSZ) electrolyte, a GDC interdiffusion barrier layer, and a La0.8Sr0.2Co0.2Fe0.8O3-delta (LSCF)-GDC cathode. A particle-dispersed glycine-nitrate process is developed to synthesize extremely fine and homogeneous LSCM GDC ceramic composite powders. The electrochemical performance of the LSCM GDC anode is comparable to that of conventional Ni-based anodes. The impedance spectra of the all-ceramic SOFCs are successfully interpreted by the independent characterization of the individual electrodes via half-cell Measurements. The impedance of the LSCM-GDC anode is dominated by a low-frequency arc originating from the "chemical capacitance", which is associated with the variation of the oxygen non-stoichiometry in the mixed conducting ceramic electrode. In addition, the impedance arc associated with the electrode-gas interaction is observed in the LSCM-GDC anode. The rate-limiting processes for the LSCF-GDC cathode are observed to be solid-state oxygen diffusion and surface chemical exchange. Herein, the reaction mechanisms and rate-limiting processes of the all-ceramic SOFCs are discussed in detail and compared with those of conventional Ni-based SOFCs. (C) 2013 Elsevier B.V. All rights reserved. English ELSEVIER REFERENCE ELECTRODE HYDROGEN OXIDATION ELECTROCHEMICAL CHARACTERIZATION POLARIZATION PHENOMENA PLATINUM-ELECTRODES OXYGEN REDUCTION DEFECT STRUCTURE SOFC ANODE KINETICS NI Fabrication and characterization of all-ceramic solid oxide fuel cells based on composite oxide anode Article 10.1016/j.jpowsour.2013.04.139 1 JOURNAL OF POWER SOURCES, v.241, pp.440 - 448 JOURNAL OF POWER SOURCES 241 440 448 scie scopus 000323093700057 2-s2.0-84878429065 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article REFERENCE ELECTRODE HYDROGEN OXIDATION ELECTROCHEMICAL CHARACTERIZATION POLARIZATION PHENOMENA PLATINUM-ELECTRODES OXYGEN REDUCTION DEFECT STRUCTURE SOFC ANODE KINETICS NI Solid oxide fuel cells Ceramic anode Impedance spectroscopy Chemical capacitance Rate limiting process