Characterization of membrane electrode assembly with hydrogen-hydrogen cell and ac-impedance spectroscopy. Part I. Experimental

A measurement system based on a symmetrical hydrogen-hydrogen cell was developed and presented. The net water flux through and impedance of Gore(TM) Primea(R) Series 58 MEA were measured under different humidity conditions. An equivalent circuit approach was used to analyze impedance measurement dat...

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Bibliographic Details
Published in:Electrochimica acta 2006-10, Vol.52 (1), p.206-214
Main Authors: HIMANEN, Olli, HOTTINEN, Tero, MIKKOLA, Mikko, SAARINEN, Ville
Format: Article
Language:English
Subjects:
Applied sciences
Energy
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Fuel cells
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Summary:A measurement system based on a symmetrical hydrogen-hydrogen cell was developed and presented. The net water flux through and impedance of Gore(TM) Primea(R) Series 58 MEA were measured under different humidity conditions. An equivalent circuit approach was used to analyze impedance measurement data and the dependences of membrane conductivity and reaction kinetics on the humidity were obtained. Modeling work was found necessary to estimate the diffusion coefficient of water in the membrane, because humidity profile inside the cell was uneven and unknown during the net water flux measurements. Gas permeabilities of different cell components and water uptake of the MEA were measured to get parameter values for the modeling work. The actual modeling work was not conducted in this contribution, but is explained in Part II of this paper.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2006.05.016