In:
ECS Transactions, The Electrochemical Society, Vol. 41, No. 1 ( 2011-10-04), p. 439-448
Abstract:
The relationship between micro structures of the GDL/MPL and mass transport property was investigated through coupled visualization and numerical analyses. The electron transport resistance of the GDL was high with the increase in compression pressure, while the oxygen transport resistance was almost unchanged. The GDL structure obtained by micro X-ray computed tomography showed the decrease in large pores as well as porosity under compression. The random walk simulation based on the obtained GDL image suggested that the increase in the number of contact points between carbon fibers contributed to the reduction of electron transport resistance. In addition to GDL, the MPL structure was reconstructed by nano X-ray computed tomography. The porosity distribution was similar in all directions, indicating that the MPL had isotropic structure. These analyses revealed that the understanding of the transport properties based on more realistic structure is essential to provide the refined insights for improving cell performance.
Type of Medium:
Online Resource
ISSN:
1938-5862
,
1938-6737
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2011
Permalink