Fabrication and characterization of all-ceramic solid oxide fuel cells based on composite oxide anode
- Authors
- Kim, Jeonghee; Shin, Dongwook; Son, Ji-Won; Lee, Jong-Ho; Kim, Byung-Kook; Je, Hae-June; Lee, Hae-Weon; Yoon, Kyung Joong
- Issue Date
- Nov-2013
- Publisher
- ELSEVIER
- Keywords
- Solid oxide fuel cells; Ceramic anode; Impedance spectroscopy; Chemical capacitance; Rate limiting process
- Citation
- JOURNAL OF POWER SOURCES, v.241, pp.440 - 448
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF POWER SOURCES
- Volume
- 241
- Start Page
- 440
- End Page
- 448
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/161522
- DOI
- 10.1016/j.jpowsour.2013.04.139
- ISSN
- 0378-7753
- Abstract
- 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.
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