Study of converging-diverging channel induced convective mass transport in a proton exchange membrane fuel cell

2021 ◽  
Vol 237 ◽  
pp. 114095
Author(s):  
Felipe Mojica ◽  
Md Azimur Rahman ◽  
Mrittunjoy Sarker ◽  
Daniel S. Hussey ◽  
David L. Jacobson ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Mass Transport ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Diverging Channel ◽  
Exchange Membrane

Minimizing mass-transport loss in proton exchange membrane fuel cell by freeze-drying of cathode catalyst layers

2019 ◽  
Vol 427 ◽  
pp. 309-317 ◽  
Author(s):  
Krishan Talukdar ◽  
Sofia Delgado ◽  
Tiago Lagarteira ◽  
Pawel Gazdzicki ◽  
K. Andreas Friedrich
Keyword(s):  
Fuel Cell ◽  
Mass Transport ◽  
Freeze Drying ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Cathode Catalyst ◽  
Catalyst Layers ◽  
Transport Loss ◽  
Exchange Membrane

scholarly journals Effect of compressive force on the performance of a proton exchange membrane fuel cell

2007 ◽  
Vol 221 (9) ◽  
pp. 1067-1074 ◽  
Author(s):  
T Ous ◽  
C Arcoumanis
Keyword(s):  
Fuel Cell ◽  
Mass Transport ◽  
Current Density ◽  
Proton Exchange Membrane ◽  
Compressive Force ◽  
Cell Voltage ◽  
Proton Exchange ◽  
Excessive Pressure ◽  
Transport Region ◽  
Exchange Membrane

The effect of the compressive force on the performance of a proton exchange membrane fuel cell has been examined experimentally. The performance has been evaluated on two polarization regions of the cell: ohmic and mass transport. Cell voltage and current density as a function of pressure were measured under constant load and various inlet air humidity conditions. The pressure distribution on the surface of the gas diffusion layer was measured using a pressure detection film and the results show that increasing the pressure improves the performance of the cell. The improvement of the cell voltage in the ohmic region was found to be greater than that in the mass transport region, whereas for the cell current density, the mass transport region exhibited higher change. The increase in the cell specific power in the ohmic and mass transport regions, as pressure increases from 0 to 2MNm-2, is estimated to be 9 and 18mWcm−2, respectively. However, the fuel cell performance in these two regions declined dramatically when excessive pressure (≥5 MNm−2) was applied. The mass transport region proved to be more susceptible to this sharp decline under excessive pressure than the ohmic region.

Mass Transports in an Air-Breathing Cathode of a Proton Exchange Membrane Fuel Cell

2009 ◽  
Vol 6 (4) ◽  
Author(s):  
J. J. Hwang ◽  
W. R. Chang ◽  
C. H. Chao ◽  
F. B. Weng ◽  
A. Su
Keyword(s):  
Fuel Cell ◽  
Mass Transport ◽  
Proton Exchange Membrane ◽  
Pem Fuel Cell ◽  
Proton Exchange ◽  
Air Breathing ◽  
Coupled Equations ◽  
Porous Cathode ◽  
Porous Cathodes ◽  
Exchange Membrane

Mass transport in an air-breathing cathode of a proton exchange membrane (PEM) fuel cell was investigated numerically. The porous cathode in contact with a perforated current collector breathes fresh air through an array of orifices. The diffusions of reactant species in the porous cathodes are described using the Stefan–Maxwell equation. The electrochemical reaction on the surfaces of the porous cathode is modeled using the Butler–Volmer equation. Gas flow in the air-breathing porous cathodes is described using isotropic linear resistance model with constant porosity and permeability. The electron/ion transports in the catalyst/electrolyte are handled using charge conservation based on Ohm’s law. A finite-element scheme is adopted to solve these coupled equations. The effects of electrode porosity (0.4<ε<0.6) on the fluid flow, mass transport, and electrochemistry are examined. Detailed electrochemical/mass characteristics, such as flow velocities, species mass fraction, species flux, and current density distributions are presented. These details provide a solid basis for optimizing the geometry of a PEM fuel cell stack that is run in passive mode.

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