The fractal nature of the three-phase boundary: A heuristic approach to the degradation of nanostructured solid oxide fuel cell anodes

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Title: The fractal nature of the three-phase boundary: A heuristic approach to the degradation of nanostructured solid oxide fuel cell anodes
Author(s): Bertei, A
Ruiz Trejo, E
Kareh, K
Yufit, V
Wang, X
Tariq, F
Brandon, N
Item Type: Journal Article
Abstract: Nickel/zirconia-based nanostructured electrodes for solid oxide fuel cells suffer from poor stability even at intermediate temperature. This study quantifies the electrochemical and microstructural degradation of nanostructured electrodes by combining 3D tomography, electrochemical impedance spectroscopy (EIS) and mechanistic modeling. For the first time, the electrochemical degradation of nanostructured electrodes is quantified according to the fractal nature of the three-phase boundary (TPB). Using this hypothesis an excellent match between modeling and the electrochemical response is found. The origin of the degradation in microstructure and electrochemical performance can be found in the initial fractal roughness of the TPB at a length scale not detectable with state-of-the-art tomography at 30 nm resolution. This additionally implies that the hydrogen electro-oxidation takes place within 4 nm from the geometric TPB line, revealing that the electrochemical reaction zone cannot be regarded anymore as a one-dimensional line when dealing with nanoparticles.
Publication Date: 16-Jun-2017
Date of Acceptance: 15-Jun-2017
URI: http://hdl.handle.net/10044/1/49302
DOI: https://dx.doi.org/10.1016/j.nanoen.2017.06.028
ISSN: 2211-2855
Publisher: Elsevier
Start Page: 526
End Page: 536
Journal / Book Title: Nano Energy
Volume: 38
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Commission of the European Communities
Funder's Grant Number: EP/M014045/1
654915
Copyright Statement: © 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/)
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
Anode degradation
Coarsening
Tomography
Infiltration
Electrochemical impedance spectroscopy
FOCUSED-ION-BEAM
X-RAY TOMOGRAPHY
MICROSTRUCTURAL EVOLUTION
REDOX CYCLES
SOFC ANODES
NICKEL
ELECTRODES
QUANTIFICATION
SIMULATION
RECONSTRUCTION
anode degradation
coarsening
tomography
infiltration
electrochemical impedance spectroscopy
Publication Status: Published
Appears in Collections:Faculty of Engineering
Earth Science and Engineering



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