Composite electrodes for ceria-carbonate intermediate temperature electrolytes

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abstract

Composite electrodes based on several ceramic oxides were tested for their chemical compatibility and electrochemical performance in systems based on composite Gd-doped ceria + alkaline carbonate electrolytes. Reactivity tests performed at 700 degrees C (accelerated testing conditions), involving the ceramic electrode materials and one mixture of Na and Li carbonates, identified two promising perovskyte-type ceramics, LaCoO3 and La0.8Sr0.2Co0.2Fe0.8O3, as the most stable. Co-pressed and co-sintered cell assemblies (electrode/electrolyte/electrode) involving composite electrodes (perovskytes mixed with alkaline carbonates)were studied in detail by scanning electron microscopy and tested by impedance spectroscopy in air in the temperature range 300-600 degrees C. These tests showed the potential of these composite electrodes for intermediate temperature applications, clearly surpassing in performance standard Au electrodes, here used as reference. (c) 2012 Elsevier Ltd. All rights reserved.

keywords

OXIDE FUEL-CELLS; ELECTRICAL-PROPERTIES; CATHODES; POLARIZATION; PERFORMANCE; LICOO2

subject category

Electrochemistry

authors

Pereira, JRS; Rajesh, S; Figueiredo, FML; Marques, FMB

our authors

foto Fernando Manuel Bico Marques

Fernando Manuel Bico Marques

Full professor
foto Filipe Miguel H Lebre R Figueiredo

Filipe Miguel H Lebre R Figueiredo

Principal Researcher
foto Rajesh Surendran Nair

Rajesh Surendran Nair

Post-doc Fellowship

Groups

G3 - Electrochemical Materials, Interfaces and Coatings

Projects

NANOCELL - Nanocomposite Electrolytes for Intermediate Temperature Fuel Cells (PTDC/CTM/098486/2008)

Centre for Research in Ceramics and Composite Materials - CICECO (LA0011: 2011-2012) (PEst-C/CTM/LA0011/2011)

acknowledgements

Financial support from Project NANOCELL (PTDC/CTM/098486/2008) and CICECO (PEst-C/CTM/LA0011/2011), FCT/COMPETE/FEDER (Portugal) is greatly appreciated. S. Rajesh thanks FCT for the post-doctoral grant (SFRH/BPD/76226/2011).

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Publication Details

type
Journal Article
year
2013
journal
ELECTROCHIMICA ACTA
volume
90
publisher
PERGAMON-ELSEVIER SCIENCE LTD
issn
0013-4686
digital object identifier
10.1016/j.electacta.2012.12.035
web of science article identifier
WOS:000316037600009

Journal Metrics (JCR 2019)

Journal Impact Factor
6.215
Journal Impact Factor (5 yrs)
5.478
category normalized journal percentile
83.333

Citations

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