Quantifying Cathode Water Transport via Anode Relative Humidity Measurements in a Polymer Electrolyte Membrane Fuel Cell

Logan Battrell, Aubree Trunkle, Erica Eggleton, Lifeng Zhang and Ryan Anderson
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Logan Battrell: Chemical and Biological Engineering Department, Montana State University, Bozeman, MT 59717, USA
Aubree Trunkle: Chemical and Biological Engineering Department, Montana State University, Bozeman, MT 59717, USA
Erica Eggleton: Chemical and Biological Engineering Department, Montana State University, Bozeman, MT 59717, USA
Lifeng Zhang: Department of Chemical and Biological Engineering, University of Saskatchewan, Saskatoon, SK S7N 5A9, Canada
Ryan Anderson: Chemical and Biological Engineering Department, Montana State University, Bozeman, MT 59717, USA

Energies, 2017, vol. 10, issue 8, 1-16

Abstract: A relative humidity (RH) measurement based on pressure drop analysis is presented as a diagnostic tool to experimentally quantify the amount of excess water on the cathode side of a polymer electrolyte membrane fuel cell (PEMFC). Ex-situ pressure drop calibration curves collected at fixed RH values, used with a set of well-defined equations for the anode pressure drop, allows for an estimate of in-situ relative humidity values. During the in-situ test, a dry anode inlet stream at increasing flow rates is used to create an evaporative gradient to drive water from the cathode to the anode. This combination of techniques thus quantitatively determines the changing net cell water flux. Knowing the cathodic water production rate, the net water flux to the anode can explain the influence of liquid and vapor transport as a function of GDL selection. Experimentally obtained quantified values for the water removal rate for a variety of cathode gas diffusion layer (GDL) setups are presented, which were chosen to experimentally vary a range of water management abilities, from high to low performance. The results show that more water is transported to the anode when a GDL with poor water management capabilities is used, due to the higher levels of initial saturation occurring on the cathode. At sufficiently high concentration gradients, the anode removes more water than is produced by the reaction, allowing for the quantification of excess water saturating the cathode. The protocol is broadly accessible and applicable as a quantitative diagnostic tool of water management in PEMFCs.

Keywords: polymer electrolyte membrane fuel cell; gas diffusion layer; water management; pressure drop; relative humidity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
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