A bi-layer cathode based on lanthanum based cobalt- and iron-containing perovskite and gadolinium doped ceria for thin yttria stabilized zirconia electrolyte solid oxide fuel cells
- Authors
- Kim, Ju Hee; Park, Yong-il; Kim, Haekyoung
- Issue Date
- Dec-2012
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Fuel cells; Electrochemistry; Electrical conductivities; Oxide
- Citation
- CERAMICS INTERNATIONAL, v.38, no.8, pp 6303 - 6310
- Pages
- 8
- Journal Title
- CERAMICS INTERNATIONAL
- Volume
- 38
- Number
- 8
- Start Page
- 6303
- End Page
- 6310
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/22382
- DOI
- 10.1016/j.ceramint.2012.04.086
- ISSN
- 0272-8842
1873-3956
- Abstract
- Composite cathodes based on La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) are investigated for lower operating temperature (< 750 degrees C) applications of a solid oxide fuel cell (SOFC). To enhance a charge transfer, a bi-layer SOFC cathode is proposed, which has a LSCF-Ce0.9Gd0.1O1.95 (GDC) composite layer and a pure LSCF layer. The bi-layer cathode SOFC shows a current density of 0.65 A cm(-2) at 0.8 V and 660 degrees C, which is higher than a LSCF-GDC composite single-layer cathode SOFC cell of 0.35 A cm(-2). The charge transfer polarizations in the bi-layer cathode SOFC are 0.14 Omega cm(2) and 0.35 Omega cm(2) at 760 degrees C and 660 degrees C, respectively, which are lower than those in the single-layer cathode cell of 0.23 Omega cm(2) and 0.66 Omega cm(2). The impedances characterized with a fitting model show that the lowered charge transfer polarization in the bi-layer cathode is a dominant factor in reducing the total polarization of SOFC. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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