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Analysis of multiphase tranport phenomena in PEMFCs by incorporating microscopic model for catalyst layer structure

Khan, Munir LU ; Xiao, Yexiang LU ; Sundén, Bengt LU and Yuan, Jinliang LU (2011) ASME International Mechanical Engineering Congress and Exposition (IMECE), 2011
Abstract
The catalyst layer (CL) in polymer electrolyte membrane

(PEM) fuel cells is one of the key components regulating the

overall performance of the cell. In PEM fuel cells, there are two

CLs having identical composition for hydrogen oxidation (HO)

and oxygen reduction (OR) reactions. There are four phases inside

the CL, namely: carbon, Pt particles, ionomer and voids.

In this work, a micro-model of the cathode CL has been developed

mathematically using finite volume (FV) technique to reconstruct

the local structure and further investigate the transport

phenomena of reactants and product species, ions and electrons

by incorporating the above stated phases... (More)
The catalyst layer (CL) in polymer electrolyte membrane

(PEM) fuel cells is one of the key components regulating the

overall performance of the cell. In PEM fuel cells, there are two

CLs having identical composition for hydrogen oxidation (HO)

and oxygen reduction (OR) reactions. There are four phases inside

the CL, namely: carbon, Pt particles, ionomer and voids.

In this work, a micro-model of the cathode CL has been developed

mathematically using finite volume (FV) technique to reconstruct

the local structure and further investigate the transport

phenomena of reactants and product species, ions and electrons

by incorporating the above stated phases at the cathode

side only, due to the fact that the OR reactions are the rate limiting

as compared to HO reaction. The 3D CL has been reconstructed

based on a regularly distributed sphere’s method with

dimensions 4:14:14:1 μm3. Platinum particles combined

with carbon spheres (C/Pt) are regularly placed in the domain,

an ionomer layer of a given thickness is extruded from the sphere

surfaces. The C/Pt, ionomer and void distribution, as well as

Address all correspondence to this author. (munir.khan@energy.lth.se)

the triple phase boundary (TPB) are analysed and discussed. A

microscopic model has been developed for water generation and

species transport including Knudsen diffusion through the voids

and the proton transport in the ionomer has been included here

to aim for the rigorousness of the work. In addition, the electrochemical

reactions have been simulated on the surface of Pt particles

fulfilling the TBP conditions. (Less)
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ASME International Mechanical Engineering Congress and Exposition (IMECE), 2011
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@misc{7d1cedf7-db95-4979-9eef-90cc25a9c54f,
  abstract     = {The catalyst layer (CL) in polymer electrolyte membrane<br/><br>
(PEM) fuel cells is one of the key components regulating the<br/><br>
overall performance of the cell. In PEM fuel cells, there are two<br/><br>
CLs having identical composition for hydrogen oxidation (HO)<br/><br>
and oxygen reduction (OR) reactions. There are four phases inside<br/><br>
the CL, namely: carbon, Pt particles, ionomer and voids.<br/><br>
In this work, a micro-model of the cathode CL has been developed<br/><br>
mathematically using finite volume (FV) technique to reconstruct<br/><br>
the local structure and further investigate the transport<br/><br>
phenomena of reactants and product species, ions and electrons<br/><br>
by incorporating the above stated phases at the cathode<br/><br>
side only, due to the fact that the OR reactions are the rate limiting<br/><br>
as compared to HO reaction. The 3D CL has been reconstructed<br/><br>
based on a regularly distributed sphere’s method with<br/><br>
dimensions 4:14:14:1 μm3. Platinum particles combined<br/><br>
with carbon spheres (C/Pt) are regularly placed in the domain,<br/><br>
an ionomer layer of a given thickness is extruded from the sphere<br/><br>
surfaces. The C/Pt, ionomer and void distribution, as well as<br/><br>
Address all correspondence to this author. (munir.khan@energy.lth.se)<br/><br>
the triple phase boundary (TPB) are analysed and discussed. A<br/><br>
microscopic model has been developed for water generation and<br/><br>
species transport including Knudsen diffusion through the voids<br/><br>
and the proton transport in the ionomer has been included here<br/><br>
to aim for the rigorousness of the work. In addition, the electrochemical<br/><br>
reactions have been simulated on the surface of Pt particles<br/><br>
fulfilling the TBP conditions.},
  author       = {Khan, Munir and Xiao, Yexiang and Sundén, Bengt and Yuan, Jinliang},
  language     = {eng},
  title        = {Analysis of multiphase tranport phenomena in PEMFCs by incorporating microscopic model for catalyst layer structure},
  year         = {2011},
}