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3-D inkjet printed solid oxide electrochemical reactors III. cylindrical pillared electrode microstructures

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Title: 3-D inkjet printed solid oxide electrochemical reactors III. cylindrical pillared electrode microstructures
Authors: Farandos, NM
Jang, I
Alexander, JC
Kelsall, GH
Item Type: Journal Article
Abstract: Inkjet printing is a scalable technique that can fabricate customised three-dimensional microstructures, reproducibly, accurately, and with high material utilisation, by printing multiple layers sequentially onto previously printed layers, to produce architectures tailored in this case to electrochemical reactors. Printable yttria-stabilised zirconia (YSZ) and lanthanum strontium manganite (LSM) inks were formulated to enable fabrication of solid oxide electrochemical reactors (SOERs): H2O-H2 | Ni(O)-YSZ | YSZ | YSZ pillars | LSM | O2. Of the geometries studied, equi-sized, hexagonally-arranged cylindrical pillars were predicted to produce the largest ratio of interfacial to geometric (cross-sectional) areas. However, this neglects effects of potential and current density distributions that constrain up-scaling to more modest factors. Hence, using kinetic parameter values from the literature, finite element computational simulations of the pillared SOER in (H2 - O2) fuel cell mode predicted peak power densities of 0.11 W cm−2 at 800 °C, whereas its counterpart with only a planar electrolyte layer produced only 0.05 W cm−2; i.e. the pillars were predicted to enhance peak power densities by ca. 2.3. Arrays of several thousand YSZ cylindrical pillars were printed, with post-sintering diameter, height, and spacing of 25, 95 and 63 μm, respectively. LSM was inkjet-printed onto the pillars, and sintered subsequently, to produce contiguous films ca. 4 μm thick. In (H2 - O2) fuel cell mode at 725, 770, and 795 °C, these reactors produced peak power densities of 0.09, 0.21, 0.30 W cm−2, respectively, 3–6 times greater than the performance of ‘benchmark’ Ni(O)-YSZ | YSZ | LSM reactors inkjet-printed with planar cathodes operating under the same conditions, thereby demonstrating the benefit of inkjet printing as a fabrication technique for SOERs.
Issue Date: 10-Sep-2022
Date of Acceptance: 9-Jul-2022
URI: http://hdl.handle.net/10044/1/99218
DOI: 10.1016/j.electacta.2022.140834
ISSN: 0013-4686
Publisher: Elsevier BV
Start Page: 1
End Page: 10
Journal / Book Title: Electrochimica Acta
Volume: 426
Copyright Statement: © 2022 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Sponsor/Funder: Shell Global Solutions International BV
Funder's Grant Number: 4550155742
Keywords: 02 Physical Sciences
03 Chemical Sciences
09 Engineering
Publication Status: Published
Article Number: 140834
Online Publication Date: 2022-07-12
Appears in Collections:Chemical Engineering

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