Novel porous electrode designs for reversible solid oxide hydrogen planar cell through multi‐physics modeling

A comprehensive multiphysics 3D model of an anode‐supported planar reversible solid oxide cell (rSOC) with a half‐channel‐unit‐cell geometry is created and validated. The physical phenomena that are modeled include reversible electrochemistry/charge transport, coupled with momentum/mass/heat transpo...

Full description

Saved in:
Bibliographic Details
Published in:Fuel cells (Weinheim an der Bergstrasse, Germany) Germany), 2023-02, Vol.23 (1), p.119-134
Main Authors: Zhou, Zhu, Xing, Lei, Venkatesan, Vijay, Xu, Haoran, Chen, Wenhua, Xuan, Jin
Format: Article
Language:English
Subjects:
Charge transport
Electrochemistry
Electrodes
Electrolysis
Fuel cells
graded porosity design
Mass transport
multi‐physics modeling
Porosity
reversible solid oxide cell
SOEC
SOFC
Three dimensional models
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A comprehensive multiphysics 3D model of an anode‐supported planar reversible solid oxide cell (rSOC) with a half‐channel‐unit‐cell geometry is created and validated. The physical phenomena that are modeled include reversible electrochemistry/charge transport, coupled with momentum/mass/heat transport. Several electrode microstructures comprising the homogeneous and functionally graded porosity distributions are applied to the validated model, to evaluate and compare the current‐voltage (j‐V) performance in both fuel cell mode and electrolysis mode. The results indicate that increasing the porosity in a homogeneous porous electrode does not always promote the cell's j‐V performance. An optimal porosity emerges where the effect of porosity on the mass transport is maximized, which ranges between 0.5 and 0.7 in the working conditions of the present study. Compared with homogeneous porous electrodes, the heterogeneous porous electrode design with a functionally graded porosity distribution is found to be a potential option to better the overall j‐V performance of the rSOC. Furthermore, it is discovered that theoretically grading the porosity in the width direction (i.e., increasing porosity from the center of each gas channel to the center of each adjacent rib) brings an outsize benefit on the cell's performance, compared to the traditional way of improving the porosity along the cell thickness direction.
ISSN:1615-6846
1615-6854
DOI:10.1002/fuce.202200151