Gas Permeability of Proton-Exchange Membranes

Authored by: Dmitri Bessarabov

PEM Fuel Cell Diagnostic Tools

Print publication date:  August  2011
Online publication date:  August  2011

Print ISBN: 9781439839195
eBook ISBN: 9781439839201
Adobe ISBN:

10.1201/b11100-24

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Abstract

21.1 Introduction and Background

Gas Permeability in the MEA Components

Membrane Gas Permeability

21.2 Effect of Membrane Gas Crossover on Fuel Cell Operations

Membrane Durability

Fuel Efficiency

Platinum Precipitation in a PEM

CO2 and CO Permeation

Gas Permeability Requirements for a Cathode in a Pem Fuel Cell

Summary

21.3 Fundamentals of Steady-State Membrane Gas Permeability Measurements

Introduction

Definition of Permeability and Measurement Units

Nonelectrochemical Methods

Diffusion Cell Design Guidelines

Electrochemical ex situ and in situ Methods

Experimental Results and Discussion

21.4 Nonsteady-State Gas Permeability Measurements

Gas Concentration Profile across the Membrane

Experimental Designs for Gas Diffusion Coefficient Measurements in Membranes

Initial Conditions for the Permeation Experiment

Basic Modeling of the Permeability Transient Curve

Interpretation of Transient Permeation Data and Estimation of Diffusion Coefficients

Functional Scale Method

Use of Transient Electrochemical Method

Method of Statistical Moments

21.5 Conclusions and Future Work

References

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