Ni-YSZ cermets for solid oxide fuel cell anodes via two-step firing

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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.

keywords

YTTRIA-STABILIZED ZIRCONIA; NICKEL-OXIDE; ELECTRICAL-PROPERTIES; NI/YSZ CERMETS; TRANSPORT-PROPERTIES; CONDUCTIVITY; COMPOSITES; ELECTROLYTE; CERAMICS; KINETICS

subject category

Chemistry; Electrochemistry; Energy & Fuels

authors

Davarpanah, A; Yaremchenko, AA; Fagg, DP; Frade, JR

our authors

foto Aleksey Yaremchenko

Aleksey Yaremchenko

Principal Researcher
foto Amin Davarpanah

Amin Davarpanah

PhD Student
foto Jorge Ribeiro Frade

Jorge Ribeiro Frade

Retired Professor

Groups

G2 - Photonic, Electronic and Magnetic Materials
G3 - Electrochemical Materials, Interfaces and Coatings

Projects

ORIEL - Oriented Lanthanum Silicate Thin Film Electrolytes for IT-SOFCS (PTDC/CTM-CER/118933/2010)

Centre for Research in Ceramics and Composite Materials - CICECO (LA0011: 2013-2014) (PEst-C/CTM/LA0011/2013)

acknowledgements

This work was supported by the FCT, Portugal (projects PTDC/CTM-CER/118933/2010, IF/01072/2013 and PEst-C/CTM/LA0011/2013).

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Publication Details

type
Journal Article
year
2014
journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
volume
39
publisher
PERGAMON-ELSEVIER SCIENCE LTD
issn
0360-3199
issue
27
digital object identifier
10.1016/j.ijhydene.2014.07.053
web of science article identifier
WOS:000341897500059

Journal Metrics (JCR 2019)

Journal Impact Factor
4.939
Journal Impact Factor (5 yrs)
4.469
category normalized journal percentile
73.237

Citations

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