The synergistic effect of cobalt oxide and Gd-CeO₂ dual infiltration in LSCF/CGO cathodes
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Author(s)
Type
Journal Article
Abstract
La0.6Sr0.4Co0.2Fe0.8O3 d/Ce0.9Gd0.1O1.9 composite cathodes were nano-engineered via “dual” inkjet
printing infiltration of nitrate salt solutions in a single step procedure. After calcination in air at 700 C
the cathodes were decorated with Ce0.9Gd0.1O1.9 and CoxOy nanoparticles ( 20 nm in size). The effects
of the as-created nano-decoration on the electrochemical activity and the performance stability in the
intermediate temperature range (500–700 C) were investigated. The nano-engineered microstructure
was found to extend the active three-phase boundary and to promote adsorption–dissociation–surface
exchange reactions. Electrochemical impedance tests conducted on symmetric cells showed
a reduction in the polarisation resistance of between 1.5 and 7.0 times depending on temperature (500–
700 C). High-resolution X-ray photoelectron spectroscopy and in situ high temperature Raman
spectroscopy were used to study aging and thermal cycling effects on the cathodes' surface chemistry.
Aging tests of the infiltrated electrodes up to 100 hours in air revealed an enhanced stability of the
decorated electrodes ascribed to the suppression of SrO surface segregation. This work demonstrated
that the sequence of infiltration of both inks introduces noticeable differences in the oxygen reduction
reaction.
printing infiltration of nitrate salt solutions in a single step procedure. After calcination in air at 700 C
the cathodes were decorated with Ce0.9Gd0.1O1.9 and CoxOy nanoparticles ( 20 nm in size). The effects
of the as-created nano-decoration on the electrochemical activity and the performance stability in the
intermediate temperature range (500–700 C) were investigated. The nano-engineered microstructure
was found to extend the active three-phase boundary and to promote adsorption–dissociation–surface
exchange reactions. Electrochemical impedance tests conducted on symmetric cells showed
a reduction in the polarisation resistance of between 1.5 and 7.0 times depending on temperature (500–
700 C). High-resolution X-ray photoelectron spectroscopy and in situ high temperature Raman
spectroscopy were used to study aging and thermal cycling effects on the cathodes' surface chemistry.
Aging tests of the infiltrated electrodes up to 100 hours in air revealed an enhanced stability of the
decorated electrodes ascribed to the suppression of SrO surface segregation. This work demonstrated
that the sequence of infiltration of both inks introduces noticeable differences in the oxygen reduction
reaction.
Date Issued
2018-03-05
Date Acceptance
2018-01-26
Citation
Journal of Materials Chemistry A, 2018, 6 (12), pp.5071-5081
ISSN
2050-7496
Publisher
Royal Society of Chemistry
Start Page
5071
End Page
5081
Journal / Book Title
Journal of Materials Chemistry A
Volume
6
Issue
12
Copyright Statement
This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material (https://creativecommons.org/licenses/by/3.0/).
License URL
Sponsor
Engineering & Physical Science Research Council (E
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000428089500017&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Grant Number
YEP206
Subjects
Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Energy & Fuels
Materials Science, Multidisciplinary
Chemistry
Materials Science
FUEL-CELL CATHODES
X-RAY PHOTOELECTRON
ELECTROCHEMICAL PERFORMANCE
COMPOSITE CATHODES
OXYGEN REDUCTION
SURFACE MODIFICATION
DOPED CERIA
THIN-FILMS
TEMPERATURE
ELECTRODES
Publication Status
Published