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Unveiling the mechanisms of solid-state dewetting in Solid Oxide Cells with novel 2D electrodes

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Title: Unveiling the mechanisms of solid-state dewetting in Solid Oxide Cells with novel 2D electrodes
Authors: Song, B
Bertei, A
Wang, X
Cooper, S
Ruiz-Trejo, E
Chowdhury, R
Podor, R
Brandon, N
Item Type: Journal Article
Abstract: During the operation of Solid Oxide Cell (SOC) fuel electrodes, the mobility of nickel can lead to significant changes in electrode morphology, with accompanying degradation in electrochemical performance. In this work, the dewetting of nickel films supported on yttriastabilized zirconia (YSZ), hereafter called 2D cells, is studied by coupling in-situ environmental scanning electron microscopy (E-SEM), image analysis, cellular automata simulation and electrochemical impedance spectroscopy (EIS). Analysis of experimental E-SEM images shows that Ni dewetting causes an increase in active triple phase boundary (aTPB) length up to a maximum, after which a sharp decrease in aTPB occurs due to Ni de-percolation. This microstructural evolution is consistent with the EIS response, which shows a minimum in polarization resistance followed by a rapid electrochemical degradation. These results reveal that neither evaporation-condensation nor surface diffusion of Ni are the main mechanisms of dewetting at 560-800 °C. Rather, the energy barrier for pore nucleation within the dense Ni film appears to be the most important factor. This sheds light on the relevant mechanisms and interfaces that must be controlled to reduce the electrochemical degradation of SOC electrodes induced by Ni dewetting.
Issue Date: 30-Apr-2019
Date of Acceptance: 19-Feb-2019
URI: http://hdl.handle.net/10044/1/67272
DOI: https://dx.doi.org/10.1016/j.jpowsour.2019.02.068
ISSN: 0378-7753
Publisher: Elsevier
Start Page: 124
End Page: 133
Journal / Book Title: Journal of Power Sources
Volume: 420
Copyright Statement: © 2019 Elsevier B.V. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/E02890X/1
EP/J021695/1
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Electrochemistry
Energy & Fuels
Materials Science, Multidisciplinary
Chemistry
Materials Science
Ni-YSZ
Dewetting
In-situ environmental SEM
Electrochemical impedance spectroscopy
FUEL-CELL
THIN-FILMS
ELECTROCHEMICAL OXIDATION
NICKEL NANOPARTICLES
DEGRADATION
ANODES
YSZ
BOUNDARY
INTERFACE
EVOLUTION
Energy
09 Engineering
03 Chemical Sciences
Publication Status: Published
Embargo Date: 2020-03-08
Online Publication Date: 2019-03-08
Appears in Collections:Faculty of Engineering
Earth Science and Engineering
Dyson School of Design Engineering



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