eprintid: 10090156
rev_number: 26
eprint_status: archive
userid: 608
dir: disk0/10/09/01/56
datestamp: 2020-01-23 15:42:12
lastmod: 2021-10-13 23:26:07
status_changed: 2020-01-23 15:42:12
type: article
metadata_visibility: show
creators_name: Lu, X
creators_name: Bertei, A
creators_name: Heenan, TMM
creators_name: Wu, Y
creators_name: Brett, DJL
creators_name: Shearing, PR
title: Multi-length scale microstructural design of micro-tubular Solid Oxide Fuel Cells for optimised power density and mechanical robustness
ispublished: pub
divisions: UCL
divisions: B04
divisions: C05
divisions: F43
keywords: Anode microstructure, Knudsen diffusion, Tortuosity factor, Micro-channels, Triple phase boundary, Mass transport
note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
abstract: In this study, we aim to parametrically reveal the dependence of electrochemical performance on a variety of microstructural characteristics at multi-length scale in a micro-tubular solid oxide fuel cell to shed light on the advanced electrode design. Numerical Direct Simulation Monte Carlo method is used on the tomographically-reconstructed 3D microstructure of the anode to characterise the tortuosity factors as a function of the porosity and pore diameter accounting for the Knudsen flow. These are subsequently incorporated in the mass transport in 2D electrochemical simulations. Results show that the Knudsen tortuosity factor is two times larger than that estimated by the continuum physics. High substrate porosity and pore size show unnoticeable effect in facilitating the mass transport provided that the micro-channels span over 60% of the radial thickness. The width and radial distribution of the micro-channels have little influence on the mass transport, but the compactness greatly affects the global performance. Optimal designs are identified as i) 80% micro-channel length and 27% substrate porosity to reach maximum power density (1.18 W cm−2) with lowered mechanical strength, or ii) 60% micro-channels length and 27% porosity to obtain a more balanced performance (0.96 W cm−2) with better long-term structural integrity.
date: 2019-09-15
date_type: published
publisher: ELSEVIER
official_url: http://dx.doi.org/10.1016/j.jpowsour.2019.226744
oa_status: green
full_text_type: other
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 1667820
doi: 10.1016/j.jpowsour.2019.226744
lyricists_name: Brett, Daniel
lyricists_name: Heenan, Thomas
lyricists_name: Lu, Xuekun
lyricists_name: Shearing, Paul
lyricists_name: Wu, Yunsong
lyricists_id: DBRET49
lyricists_id: THEEN37
lyricists_id: XLUAX78
lyricists_id: PSHEA33
lyricists_id: YWUDX61
actors_name: Dewerpe, Marie
actors_id: MDDEW97
actors_role: owner
full_text_status: public
publication: Journal of Power Sources
volume: 434
article_number: 226744
pages: 12
citation:        Lu, X;    Bertei, A;    Heenan, TMM;    Wu, Y;    Brett, DJL;    Shearing, PR;      (2019)    Multi-length scale microstructural design of micro-tubular Solid Oxide Fuel Cells for optimised power density and mechanical robustness.                   Journal of Power Sources , 434     , Article 226744.  10.1016/j.jpowsour.2019.226744 <https://doi.org/10.1016/j.jpowsour.2019.226744>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10090156/3/Lu_manuscript_doubleline_2nd%20round.pdf