Thermal-fluid transports in a five-layer membrane-electrode assembly of a PEM fuel cell

2006 ◽  
Vol 163 (1) ◽  
pp. 450-459 ◽  
Author(s):  
J.J. Hwang ◽  
C.H. Chao ◽  
W. Wu
Keyword(s):  
Fuel Cell ◽  
Pem Fuel Cell ◽  
Membrane Electrode Assembly ◽  
Membrane Electrode ◽  
Layer Membrane

Catalytic layer-membrane electrode assembly methods for optimum triple phase boundaries and fuel cell performances

2021 ◽  
Author(s):  
Imen Fouzaï ◽  
Solène Gentil ◽  
Victor Costa Bassetto ◽  
Wanderson Oliveira Silva ◽  
Raddaoui Maher ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Membrane Electrode Assembly ◽  
Emerging Technology ◽  
Membrane Electrode ◽  
Catalytic Layer ◽  
Phase Boundaries ◽  
Layer Membrane ◽  
Critical Overview

A critical overview of MEA fabrication techniques is given focusing on the formation of triple phase boundaries, known for increasing PEMFC performances. Print-light-synthesis is a new emerging technology to achieve nanostructred MEA.

In-Situ Measurements of Water Transfer Due to Different Mechanisms in a PEM Fuel Cell

2007 ◽  
Author(s):  
Attila Husar ◽  
Andrew Higier ◽  
Hongtan Liu
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Pem Fuel Cell ◽  
Membrane Electrode Assembly ◽  
Pem Fuel Cells ◽  
Water Transfer ◽  
Proton Exchange ◽  
Membrane Electrode ◽  
Order Of Magnitude

Water management is of critical importance in a proton exchange membrane (PEM) fuel cell. Yet there are very limited studies of water transfer through the membrane and no data are available for water transfer due to individual mechanisms through the membrane electrode assembly (MEA) in an operational fuel cell. Thus it is the objective of this study to measure water transfer through the MEA due to different mechanisms through the membrane electrode assembly (MEA) of an operational PEM fuel cell. The three different mechanisms of water transfer, i.e., electro-osmotic drag, diffusion and hydraulic permeation were isolated by specially imposed boundary conditions. Therefore water transfer through the MEA due to each mechanism could be measured separately. In this study, all the data were collected in an actual assembled operational fuel cell, and some of the data were collected while the fuel cell was generating power. The measured results showed that water transfer due to hydraulic permeation, i.e. the pressure difference between the anode and cathode is at least an order of magnitude lower than those due to other two mechanisms. The data for water transfers due to electro-osmosis and diffusion through the MEA are in good agreement with some of the data and model predications in the literature for the membrane. The methodology used in this study is simple and can be easily adopted for in-situ water transfer measurement due to different mechanisms in actual PEM fuel cells without any cell modifications.

Enhancement of PEM Fuel Cell Performance by Flow Control

2014 ◽  
Vol 804 ◽  
pp. 75-78 ◽  
Author(s):  
Vinh Nguyen Duy ◽  
Jung Koo Lee ◽  
Ki Won Park ◽  
Hyung Man Kim
Keyword(s):  
Fuel Cell ◽  
Flow Field ◽  
Pem Fuel Cell ◽  
Membrane Electrode Assembly ◽  
Cell Performance ◽  
Field Pattern ◽  
Battery Life ◽  
Membrane Electrode ◽  
Fuel Cell Performance ◽  
Serpentine Flow Field

Flow-field design affects directly to the PEM fuel cell performance. This study aims to stimulate the under-rib convection by adding sub-channels and by-passes to the conventional-advanced serpentine flow-field to improve the PEM fuel cell performance. The experimental results show that if reacting gases flow in the same direction as the neighboring main channels, the under-rib convection shows a flow from the main channels to the sub-channels makes progress in reducing pressure drop and enhancing uniform gas supply and water diffusion. Alternatively, if in the direction opposite to that of the neighboring main channels, the under-rib convection shows a flow from the inlet side towards the outlet side across the sub-channel as in the conventional serpentine channels. Analyses of the local transport phenomena in the cell suggest that the inlet by-pass supplies the reacting gases uniformly from the entrance into the sub-channels and the outlet by-pass enhances water removal. Novel serpentine flow-field pattern employing sub-channels and by-passes shows uniform current density and temperature distribution by uniformly supplying the reacting gas. Furthermore, performance improvement of around 20% is observed from the experimental performance evaluation. As a result, longer battery life is expected by reducing the mechanical stress of membrane electrode assembly.

Experimental Investigation of Irreversibility of a Proton Exchange Membrane Fuel Cell

2012 ◽  
Vol 134 (2) ◽  
Author(s):  
I. Khazaee
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Exergy Analysis ◽  
Pem Fuel Cell ◽  
Membrane Electrode Assembly ◽  
Proton Exchange ◽  
Membrane Electrode ◽  
Cell Temperature ◽  
Internal Parameters ◽  
Exchange Membrane

For an 11 W proton exchange membrane (PEM) fuel cell, the exergy analysis at different channel geometry and internal parameters such as temperature, pressure, and mass flow rate are investigated experimentally. The geometry of the cell is rectangular, elliptical, and triangular. A PEM fuel cell with 25cm2 active area and Nafion 117 membrane with 4 mg Pt cm-2 for the anode and cathode is employed as a membrane electrode assembly. The results show that when the geometry of the cell is rectangular, the irreversibility of the cell is at lower value and the exergy efficiency is at higher value. Also, the results show that with the increase of hydrogen, oxygen, and cell temperature, the exergy efficiencies of the cell increase and irreversibilities decrease.

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