TY - JOUR
T1 - Characterization of the dynamic response of proton exchange membrane fuel cells - A numerical study
AU - Loo, K.H.
AU - Wong, K.H.
AU - Tan, S.C.
AU - Lai, Y.M.
AU - Tse, Chi K.
PY - 2010/11
Y1 - 2010/11
N2 - 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. © 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
AB - 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. © 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
KW - Characteristic time
KW - Dynamic behavior
KW - PEM fuel cell
KW - Polymer electrolyte fuel cell
KW - Transient response
KW - Water flooding
UR - http://www.scopus.com/inward/record.url?scp=77957701013&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-77957701013&origin=recordpage
U2 - 10.1016/j.ijhydene.2010.08.071
DO - 10.1016/j.ijhydene.2010.08.071
M3 - RGC 21 - Publication in refereed journal
SN - 0360-3199
VL - 35
SP - 11861
EP - 11877
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 21
ER -
