Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/22992
Title: Characterization of the dynamic response of proton exchange membrane fuel cells - A numerical study
Authors: Loo, KH 
Wong, KH
Tan, SC
Lai, YM 
Tse, CK 
Keywords: Characteristic time
Dynamic behavior
PEM fuel cell
Polymer electrolyte fuel cell
Transient response
Water flooding
Issue Date: 2010
Publisher: Pergamon Press
Source: International journal of hydrogen energy, 2010, v. 35, no. 21, p. 11861-11877 How to cite?
Journal: International journal of hydrogen energy 
Abstract: The dynamic response of PEM (Proton exchange membrane) fuel cells is a complex phenomenon which is affected by numerous factors related to their designs and operating conditions. Despite that experimental data is available in the literature, a systematic numerical study to explain the dynamic behavior of PEM fuel cells is currently unavailable. In this paper, a one-dimensional, two-phase, dynamic model of PEM fuel cell is developed to achieve this principal objective. Transient profiles of cell voltage, activation and ohmic over-potentials, saturation level of liquid water, oxygen concentration, and membrane water content are predicted under various operating conditions. Under constant fuel and air flow rates, it is found that the cell voltage exhibits undershoot behavior following a step increase in current density due to the inherent time delay experienced by the redistribution of membrane water content with a response time of ∼50 s. The undershoot is followed by an overshoot in the presence of flooding with a significantly longer predicted response time of ∼150-200 s. It is found that the various operating conditions mainly affect the specific details of the undershoot and overshoot profiles without changing their general behavioral forms.
URI: http://hdl.handle.net/10397/22992
ISSN: 0360-3199
EISSN: 1879-3487
DOI: 10.1016/j.ijhydene.2010.08.071
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