Fabrication and characterization of all-ceramic solid oxide fuel cells based on composite oxide anode
- Title
- Fabrication and characterization of all-ceramic solid oxide fuel cells based on composite oxide anode
- Author
- 신동욱
- Keywords
- Solid oxide fuel cells; Ceramic anode; Impedance spectroscopy; Chemical capacitance; Rate limiting process
- Issue Date
- 2013-06
- Publisher
- Elsevier Science B.V., Amsterdam.
- Citation
- Journal of Power Sources, 1 November 2013, 241, p.440-448
- 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. (C) 2013 Elsevier B.V. All rights reserved.
- URI
- https://www.sciencedirect.com/science/article/pii/S0378775313007490http://hdl.handle.net/20.500.11754/46164
- ISSN
- 0378-7753
- DOI
- 10.1016/j.jpowsour.2013.04.139
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
- Files in This Item:
There are no files associated with this item.
- Export
- RIS (EndNote)
- XLS (Excel)
- XML