Semiempirical Model for Determining PEM Electrolyzer Stack Characteristics

[+] Author and Article Information
Kevin W. Harrison1

Department of Electrical Engineering,  University of North Dakota, Grand Forks, North Dakotakevin.harrison@und.edu

Eduardo Hernández-Pacheco

Department of Chemical Engineering,  University of North Dakota, Grand Forks, North Dakotaehernand@und.nodak.edu

Michael Mann

Department of Chemical Engineering,  University of North Dakota, Grand Forks, North DakotaMikeMann@mail.und.nodak.edu

Hossein Salehfar

Department of Electrical Engineering,  University of North Dakota , Grand Forks, North Dakotah-salehfar@und.nodak.edu


Address all correspondence to this author.

J. Fuel Cell Sci. Technol 3(2), 220-223 (Nov 18, 2005) (4 pages) doi:10.1115/1.2174072 History: Received July 21, 2005; Revised November 18, 2005

A semiempirical equation was used to represent the performance characteristics of a 20-cell proton exchange membrane electrolyzer stack. The coefficients of the equation are the exchange current densities and membrane conductivity. These coefficients were determined using experimental data and a nonlinear curve fitting method. The anode exchange current density was found to be 1.65×108Acm2, the cathode exchange current density 0.09Acm2, and the membrane conductivity 0.075Scm1. External programmable power supplies were used to obtain the (IV) characteristic curve of a commercial proton exchange membrane electrolyzer. Stack current, voltage, and system temperature were monitored while 1A current steps were applied to the electrolyzer stack.

Copyright © 2006 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 1

Measured current-voltage characteristic curve for 20-cell PEM electrolyzer

Grahic Jump Location
Figure 2

Calculated Nernst potential (per cell) as a function of current. Temperature and pressure vary with current.

Grahic Jump Location
Figure 3

Experimental current-voltage curve (∘) and approximated expression Eq. 12(–)



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