Chapter 7 - Modeling the Proton Exchange Structure

Abstract

The electrolyte layer is essential for a fuel cell to work properly. In proton exchange membrane fuel cells (PEMFCs), the fuel travels to the catalyst layer and gets broken into protons and electrons. PEMFC must meet the following requirements in order for the fuel cell to work properly: high ionic conductivity, present an adequate barrier to the reactants, be chemically and mechanically stable, low electronic conductivity, ease of manufacturability/availability, and preferably low cost. This chapter explains the physical characteristics, properties, and current-modeling theories for the polymer exchange membranes used for PEMFC. Accurately modeling the PEM layer can improve the properties of future membrane materials. There are many types of PEM models and choosing the right one depends upon the end goals and resources available. Balances must be written for the fuel cell membrane layer in order to have an accurate model, mass, energy, and charge. Using an empirical relationship for membrane water content when creating a model saves time. The requirements for the membrane include high ionic conductivity, adequate barrier to the reactants, and chemically and mechanically stable and low electronic conductivity. There are many choices for the PEM in the fuel cell, and the decision regarding the type chosen must depend upon many factors, which include cost and mass manufacturing capabilities.