Guidelines for the rational design and engineering of 3D manufactured solid oxide fuel cell composite electrodes

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Title: Guidelines for the rational design and engineering of 3D manufactured solid oxide fuel cell composite electrodes
Author(s): Bertei, A
Tariq, F
Yufit, V
Ruiz Trejo, E
Brandon, N
Item Type: Journal Article
Abstract: The growth of 3D printing has opened the scope for designing microstructures for solid oxide fuel cell s (SOFCs) with improved power density and lifeti me. This technique can introduce structural modifications at a scale larger than particle size but smaller than cell size, such as by inserting electrolyte pillars of ~5 - 100 µ m. This study sets the minimum requirements for the rational design of 3D printed electrodes based on an electrochemical model and analytical solutions for functional layers with negligible electronic resistance and no mixed conduction . Results show that this structural modification enhances the power density when the ratio k eff betwee n effective conductivity and bulk conductivity of the ionic phase is smaller than 0.5. The maximum performance improvement is predicted as a function of k eff . A design study on a wide range of pillar shapes indicates that improvements are achieved by any s tructural modification which provides ionic conduction up to a characteristic thickness ~10 - 40 µ m without removing active volume at the electrolyte interface. The best performance is reached for thin (< ~2 µ m) and long (> ~80 µ m) pillars when the composite electrode is optimised for ma ximum three - phase boundary density, pointing towards the design of scaffolds with well - defined geometry and fractal structures.
Publication Date: 31-Dec-2017
Date of Acceptance: 3-Dec-2016
ISSN: 0013-4651
Publisher: Electrochemical Society
Journal / Book Title: Journal of the Electrochemical Society
Copyright Statement: This paper is embargoed until publication. Once published will be available fully open access.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Commission of the European Communities
Funder's Grant Number: EP/M014045/1
Keywords: Energy
0303 Macromolecular And Materials Chemistry
0306 Physical Chemistry (Incl. Structural)
0912 Materials Engineering
Publication Status: Accepted
Embargo Date: publication subject to indefinite embargo
Appears in Collections:Faculty of Engineering
Earth Science and Engineering

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