TY - JOUR
T1 - Geometrical modeling of microstructure of solid oxide fuel cell composite electrodes
AU - Ali, Abbaspour
AU - Wen, X.
AU - Nandakumar, K.
AU - Luo, Jingli
AU - Chuang, Karl T.
N1 - Funding Information:
The authors of this work would like to gratefully acknowledge the financial support through the NSERC strategic grant.
PY - 2008/12/1
Y1 - 2008/12/1
N2 - A model based on random packing of electron and ion conductor particles is developed to study the microstructure performance relationship of solid oxide fuel cell electrodes. This three-dimensional model takes into account special variations of triple phase boundary (TPB) by keeping track of all particles in the packing. Porosity of the media can be controlled and is set to 30%. Effect of particle size, electrode thickness, electrode composition and particle size ratio on the length of TPB line has been studied. The study shows that unlike what models based on percolation theory suggest, the electrode media is not homogeneous for electrochemical reaction. While increasing the thickness increases the length of the TPB to some extent, beyond that little or no improvement was observed. The study also revealed that adding a current collector layer made of electron conductors can increase the TPB line by at least 4%. While for particles of the same size maximum length of TPB was observed at equal volume percent of electron and ion conductor particles, for size ratio of particles other than one the maximum TPB tends to occur above or below 50% depending on the size ratio. Crown
AB - A model based on random packing of electron and ion conductor particles is developed to study the microstructure performance relationship of solid oxide fuel cell electrodes. This three-dimensional model takes into account special variations of triple phase boundary (TPB) by keeping track of all particles in the packing. Porosity of the media can be controlled and is set to 30%. Effect of particle size, electrode thickness, electrode composition and particle size ratio on the length of TPB line has been studied. The study shows that unlike what models based on percolation theory suggest, the electrode media is not homogeneous for electrochemical reaction. While increasing the thickness increases the length of the TPB to some extent, beyond that little or no improvement was observed. The study also revealed that adding a current collector layer made of electron conductors can increase the TPB line by at least 4%. While for particles of the same size maximum length of TPB was observed at equal volume percent of electron and ion conductor particles, for size ratio of particles other than one the maximum TPB tends to occur above or below 50% depending on the size ratio. Crown
KW - Composite electrode
KW - Particle size
KW - Solid oxide fuel cells
KW - Triple phase boundary
UR - http://www.scopus.com/inward/record.url?scp=56049101350&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2008.09.032
DO - 10.1016/j.jpowsour.2008.09.032
M3 - 文章
AN - SCOPUS:56049101350
SN - 0378-7753
VL - 185
SP - 961
EP - 966
JO - Journal of Power Sources
JF - Journal of Power Sources
IS - 2
ER -
