Investigating the performance of catalyst layer micro-structures with different platinum loadings Page: 3 of 8
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ECS Transactions, 50 (2) 765-772 (2012)
-~I
* .4
%.
:"Membrane/CL
interface
Platinum
loading =
0.6 [mg/cm2]* Porous Transport
Layer/CL interfaceMembrane/CL
interface
A."
SPlatnum
loading =
" 0.4 [mg/cm2]
Porous Transport
S Layer/CL interfaceSi
Membrane/CL
interface
Platinum
leading =
0.3 [mg/cm2]
Porous Transport
layer/CL interface,4
ti',fMembrane/CL
interface
Platinum
loading =
0.1 [mg/cm2]
Porous Transport
Layer/CL interfaceFigure 2. Slices of micro-structures with different platinum loadings produced by
randomly excluding platinum particles and adding them to carbon phase.
Governing Equations
Conservation of mass considering diffusive transport has been used to model species
transport in pore phase of the micro-structure:V.(D~ffVy ) = 0
where Deff is the effective diffusivity including Knudsen effects:
1 1 1
D ffD + -
DQ DKn Db[1]
[2]where Db is the bulk diffusivity of species i. The same equation has been used to model
species transport through the ionomer region, using a constant diffusivity with no
correction for Knudsen effects.Henry's law was implemented on the interface between pore and ionomer regions:
02 ionomer H[3]
Conservation of charge was used to model positive charge transport though ionomer
phase of micro-structure:[4]
Conservation of charge was also implemented within the electronically conducting phase:
V.(eV9tpe) =0 [5]Downloaded on 2013-06-26 to IP 64.114.51.77 address. Redistributi6%subject to ECS license or copyright; see ecsdl.org/site/termsuse
V.(-o p(p = 0
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Khakaz-Baboli, Moben; Harvey, David & Pharoah, Jon. Investigating the performance of catalyst layer micro-structures with different platinum loadings, article, July 1, 2012; United States. (https://digital.library.unt.edu/ark:/67531/metadc841799/m1/3/: accessed March 29, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.