Porous Gd-doped ceria barrier layer on solid oxide fuel cell with Sm0.5Sr0.5CoO3-delta Cathodes

Title
Porous Gd-doped ceria barrier layer on solid oxide fuel cell with Sm0.5Sr0.5CoO3-delta Cathodes
Author(s)
김혜경박영민[박영민]
Keywords
CONDUCTING OXYGEN ELECTRODES; FERRITE-BASED PEROVSKITES; COMPOSITE CATHODES; ELECTROCHEMICAL PERFORMANCE; SOFC; INTERLAYER; IMPEDANCE; EXCHANGE; BEHAVIOR; MODEL
Issue Date
201303
Publisher
ELSEVIER SCI LTD
Citation
CERAMICS INTERNATIONAL, v.39, no.2, pp.2037 - 2043
Abstract
Cobaltite based perovskites, such as Sm0.5Sr0.5CoO3-delta (SSC), are attractive as a cathode for solid oxide fuel cell (SOFC) due to their high electrochemical activity and electrical conductivity. In this study, nano-sized SSC powders were synthesized by a complex method. To prevent reactions between cathode and an yttria-stabilized zirconia (YSZ) electrolyte, we propose a Gd-doped ceria (GDC) porous barrier layer and formed barrier layers, screen-printed to 5, 10, and 15 mu m thicknesses. The performance of SOFCs without a GDC layer decrease by 23% from 0.78 Wcm(-2) to 0.6 Wcm(-2) after 12 h of operation at 780 degrees C. A SOFC with a screen-printed GDC of 5 mu m shows a performance decrease of only 4% from 0.75 Wcm(-2) to 0.72 Wcm(-2) after 12 h of operation at 780 degrees C. Fuel cell performance decreases with decreasing thickness of the porous GDC layer, which may result from the lowered SSC active area due to its reaction with the YSZ electrolyte. The increase in ohmic resistance due to a thicker porous GDC layer is mitigated by a decrease in ohmic resistance due to reduced reaction between the SSC and YSZ. To use SSC in SOFCs, a barrier layer should be applied to obtain grater fuel cell performance and stability. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/26242http://dx.doi.org/10.1016/j.ceramint.2012.08.056
ISSN
0272-8842
Appears in Collections:
공과대학 > 신소재공학부 > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE