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A mathematical model for the iron/chromium redox batteryA mathematical model has been developed to describe the isothermal operation of a single anode-separator-cathode unit cell in a redox-flow battery and has been applied to the NASA iron/chromium system. The model, based on porous electrode theory, incorporates redox kinetics, mass transfer, and ohmic effects as well as the parasitic hydrogen reaction which occurs in the chromium electrode. A numerical parameter study was carried out to predict cell performance to aid in the rational design, scale-up, and operation of the flow battery. The calculations demonstrate: (1) an optimum electrode thickness and electrolyte flow rate exist; (2) the amount of hydrogen evolved and, hence, cycle faradaic efficiency, can be affected by cell geometry, flow rate, and charging procedure; (3) countercurrent flow results in enhanced cell performance over cocurrent flow; and (4) elevated temperature operation enhances cell performance.
Document ID
Document Type
Reprint (Version printed in journal)
Fedkiw, P. S.
(North Carolina State Univ. Raleigh, NC, United States)
Watts, R. W.
(North Carolina State University Raleigh, NC, United States)
Date Acquired
August 12, 2013
Publication Date
April 1, 1984
Publication Information
Publication: Electrochemical Society, Journal
Volume: 131
ISSN: 0013-4651
Subject Category
Energy Production And Conversion
Accession Number
Distribution Limits

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