Artículo
Influence of the dwell time in the polarization hysteresis of polymer electrolyte membrane fuel cells
Autor/es | Iranzo Paricio, José Alfredo
Navas Herrera, Sergio Jesús Pino Lucena, Francisco Javier Althubiti, Numa A. Berber, Mohamed R. |
Departamento | Universidad de Sevilla. Departamento de Ingeniería Energética |
Fecha de publicación | 2022-07 |
Fecha de depósito | 2023-06-02 |
Resumen | The extent of the cell voltage hysteresis observed in polarization curves of PEM fuel cells and the origins causing this effect are investigated by performing experimental polarization curves with different dwell times for ... The extent of the cell voltage hysteresis observed in polarization curves of PEM fuel cells and the origins causing this effect are investigated by performing experimental polarization curves with different dwell times for a 50 cm2 PEM fuel cell. Electrochemical Impedance Spectroscopy measurements are carried out in order to determine the relative contributions of the different polarizations (ohmic, activation, and concentration polarization). Equivalent circuits were obtained from the impedance spectra, where the interpretation of the circuit parameters enabled the analysis of the origin and extent of the cell voltage hysteresis. It was identified that the cause of the cell voltage hysteresis is actually dominated by the changes in the concentration polarization at low current densities, and by the changes in the activation polarization at high current densities. The cell ohmic resistance (and consequently the membrane hydration) presents a minor effect on the cell voltage hysteresis. The effect of the dwell time in the cell voltage hysteresis (with values ranging from 15 to 25 mV) presents a mixed trend, with an initial decrease for increasing dwell times from 120 to 600 s, and a later increase and a final almost constant hysteresis for longer dwell times. |
Agencias financiadoras | Ministry of Education in Saudi Arabia Project No. 375213500 Spanish Ministry of Science, Innovation and Universities Grant ENE2017-91159-EXP Spanish Ministry of Science, Innovation and Universities Grant PID2019-104441RB-I0 Spanish Ministry of Economy and Competitiveness Grant UNSE15-CE2962 Consejería de Economía, Conocimiento, Empresas y Universidad (Junta de Andalucía) co-funded with ERDF funds PY20 RE026 AICIA |
Identificador del proyecto | Deputyship for Research & Innovation No. 375213500
ENE2017-91159-EXP PID2019-104441RB-I0 UNSE15-CE2962 PY20 RE026 AICIA |
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