This paper proposes the use of electrochemical impedance spectroscopy (EIS) to estimate the cathode flow rate in a fuel cell system. Through experimental testing of an eight-cell, hydrogen-fueled polymer electrolyte stack, it shows that the ac impedance measurements are highly sensitive to the air flow rates at varying current densities. The ac impedance magnitude at 0.1Hz allows the distinction of air flow rates (stoichiometry of 1.5–3.0) at current densities as low as 0.1A/cm2. Using experimental data and regression analysis, a simple algebraic equation that estimates the air flow rate using impedance measurements at a frequency of 0.1Hz is developed. The derivation of this equation is based on the operating cell voltage equation that accounts for all the irreversibilities.
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ASME 2008 Dynamic Systems and Control Conference
October 20–22, 2008
Ann Arbor, Michigan, USA
Conference Sponsors:
- Dynamic Systems and Control Division
ISBN:
978-0-7918-4335-2
PROCEEDINGS PAPER
Estimating Air Flow Rates in a Fuel Cell System Using Electrochemical Impedance
Judith O’Rourke,
Judith O’Rourke
Rensselaer Polytechnic Institute, Troy, NY
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Murat Arcak,
Murat Arcak
Rensselaer Polytechnic Institute, Troy, NY
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Manikandan Ramani
Manikandan Ramani
Plug Power Inc., Latham, NY
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Judith O’Rourke
Rensselaer Polytechnic Institute, Troy, NY
Murat Arcak
Rensselaer Polytechnic Institute, Troy, NY
Manikandan Ramani
Plug Power Inc., Latham, NY
Paper No:
DSCC2008-2172, pp. 497-503; 7 pages
Published Online:
June 29, 2009
Citation
O’Rourke, J, Arcak, M, & Ramani, M. "Estimating Air Flow Rates in a Fuel Cell System Using Electrochemical Impedance." Proceedings of the ASME 2008 Dynamic Systems and Control Conference. ASME 2008 Dynamic Systems and Control Conference, Parts A and B. Ann Arbor, Michigan, USA. October 20–22, 2008. pp. 497-503. ASME. https://doi.org/10.1115/DSCC2008-2172
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