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Electrochemical Diffusimetry of Fuel Cell Gas Diffusion Layers by Denis Kramer; Stefan A. Freunberger; Reto Flückiger; Ingo A. Schneider; Alexander Wokaun; Felix N. Büchi; Günther G. Scherer is a Engineering article available to read on EtoBox.

What is Electrochemical Diffusimetry of Fuel Cell Gas Diffusion Layers about?

The gas diffusion layers (GDLs) of a membrane electrode assembly (MEA) serve as link between flow field and porous electrode within a polymer electrolyte fuel cell. Beside ensuring sufficient electrical and thermal contact between the whole electrode area and the flow field, these typically 200-400 lm thick porous structures enable the access of educts to the electrode area which would be occluded by the flow field lands if the flow field is directly attached to the electrode. Hence, the characterisation of properties pertaining to mass transport of educts and products through these structures is indispensable whilst examining the contribution of the GDLs to the overall electrochemical characteristics of a MEA. A fast and cost effective method to measure the effective diffusivity of a GDL is presented. Electrochemical impedance spectroscopy is applied to measure the effective ionic conductivity of an electrolyte-soaked GDL. Taking advantage of the analogy between Ficks and Ohms law, this provides a measure for the effective diffusivity. The method is described in detail, including experimental as well as theoretical aspects, and selected results, highlighting the anisotropy and dep

Who reads Electrochemical Diffusimetry of Fuel Cell Gas Diffusion Layers?

Author

Denis Kramer; Stefan A. Freunberger; Reto Flückiger; Ingo A. Schneider; Alexander Wokaun; Felix N. Büchi; Günther G. Scherer

Publisher

Elsevier ; Elsevier BV (ISSN 1572-6657)

Published

2008

Language

EN

Field

Engineering (Physical Sciences)