Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 199-215 |
| Number of pages | 17 |
| Journal | Journal of Power Sources |
| Volume | 215 |
| Early online date | 16 May 2012 |
| DOIs | |
| Publication status | Published - 1 Oct 2012 |
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Keywords
- solid oxide fuel cells (SOFC)
- three-phase boundary
- percolation theory
- microstructure
- composite electrode
- multi-physics modeling
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Impact of particle size ratio and volume fraction on effective material parameters and performance in solid oxide fuel cell electrodes. / McMeeking, Robert M.; Völker , Benjamin.
In: Journal of Power Sources, Vol. 215, 01.10.2012, p. 199-215.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Impact of particle size ratio and volume fraction on effective material parameters and performance in solid oxide fuel cell electrodes
AU - McMeeking, Robert M.
AU - Völker , Benjamin
PY - 2012/10/1
Y1 - 2012/10/1
N2 - Optimization of the microstructure of porous electrodes plays an important role in the enhancement of the performance of solidoxidefuelcells. For this, microstructural models based on percolation theory have proven useful for the estimation of the effectivematerial properties of the electrodematerial, assumed to consist of a binary mixture of spherical electron and ion conducting particles. In this work, we propose an extension of prior approaches for calculating the effectivesize of the three-phase boundary, which we judge to be physically more sound and, in particular, well suited for characterizing mixtures of particles of different sizes. This approach is then employed in a one-dimensional cell level model encompassing the entire set of processes of gas transport, electronic and ionic conduction as well as the electrochemical reactions. The impact of the electron and ion conducting particlesizes, their volumefraction and their sizeratio on the performance of the fuelcell are investigated in a parametric study. Under certain conditions, cathode microstructures having electronic conducting particles of size different from that of the ionic conducting particles become preferable and yield a higher maximum power density when compared to the best possible configuration of monodisperse particles.
AB - Optimization of the microstructure of porous electrodes plays an important role in the enhancement of the performance of solidoxidefuelcells. For this, microstructural models based on percolation theory have proven useful for the estimation of the effectivematerial properties of the electrodematerial, assumed to consist of a binary mixture of spherical electron and ion conducting particles. In this work, we propose an extension of prior approaches for calculating the effectivesize of the three-phase boundary, which we judge to be physically more sound and, in particular, well suited for characterizing mixtures of particles of different sizes. This approach is then employed in a one-dimensional cell level model encompassing the entire set of processes of gas transport, electronic and ionic conduction as well as the electrochemical reactions. The impact of the electron and ion conducting particlesizes, their volumefraction and their sizeratio on the performance of the fuelcell are investigated in a parametric study. Under certain conditions, cathode microstructures having electronic conducting particles of size different from that of the ionic conducting particles become preferable and yield a higher maximum power density when compared to the best possible configuration of monodisperse particles.
KW - solid oxide fuel cells (SOFC)
KW - three-phase boundary
KW - percolation theory
KW - microstructure
KW - composite electrode
KW - multi-physics modeling
U2 - 10.1016/j.jpowsour.2012.05.014
DO - 10.1016/j.jpowsour.2012.05.014
M3 - Article
VL - 215
SP - 199
EP - 215
JO - Journal of Power Sources
JF - Journal of Power Sources
SN - 0378-7753
ER -