Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/19937
Title: | Ni-YSZ cermets for solid oxide fuel cell anodes via two-step firing |
Author: | Davarpanah, A. Yaremchenko, A. A. Fagg, D. P. Frade, J. R. |
Keywords: | YTTRIA-STABILIZED ZIRCONIA NICKEL-OXIDE ELECTRICAL-PROPERTIES NI/YSZ CERMETS TRANSPORT-PROPERTIES CONDUCTIVITY COMPOSITES ELECTROLYTE CERAMICS KINETICS |
Issue Date: | 2014 |
Publisher: | PERGAMON-ELSEVIER SCIENCE LTD |
Abstract: | The electrochemical performance and dimensional stability of Ni-YSZ cermets, conventionally used as solid oxide fuel cell anodes, depend strongly on their microstructure and therefore fabrication conditions. This work was focused on the assessment of a less common two-step firing procedure for fabrication of Ni-YSZ cermets with comparatively low nickel fraction of 30 vol.%. The impact of different firing parameters including peak temperature (1623-1723 K), heating/cooling rate (4-10 K/min), and isothermal treatment temperature (1473-1573 K) and time (2-8 h), on the porosity and electrical conductivity of cermets was assessed employing Taguchi experimental planning. The applied procedure yielded Ni-YSZ composites with porosity 26-35% and electrical conductivity ranging from 170 to 420 S/cm at 873-1173 K in 10%H-2-N-2 atmosphere. Microstructural studies indicated that the conductivity is determined mainly by Ni particle size distribution. Analysis of results suggests that, for the studied range of sintering parameters, a higher peak temperature and ramp rate are favorable for the improvement of conductivity, whereas isothermal dwell temperature and time have a rather minor effect on the conductivity level. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/19937 |
DOI: | 10.1016/j.ijhydene.2014.07.053 |
ISSN: | 0360-3199 |
Publisher Version: | 10.1016/j.ijhydene.2014.07.053 |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Ni-YSZ cermets for solid oxide fuel cell anodes via two-step firing_10.1016j.ijhydene.2014.07.053.pdf | 2.11 MB | Adobe PDF |
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