Uso de la tecnica de interrupcion de corriente para la caracterizacion de una celda de combustible no humidificada con membrana de intercambio protonico (Spanish text).

摘要

Fuel Cells have emerged as one of the most promising technologies for the power source of the future. The Proton exchange membrane (PEM) has some inefficiencies that can be measured using a current interruption technique with hydrogen and oxygen as raw materials. The current interruption method instantaneously stops the current through the membrane. The response of the membrane during this change is used to characterize it. A Tektronix TDS 3032 oscilloscope was used to measure the voltage drop of the system. Three different fluxes of hydrogen and oxygen at stoichiometric rates were studied in this work (8.5, 5.3 and 2.7ml/min for hydrogen flow). The results are presented using two graphical approaches: one for open and another for the closed circuit. The graphs were classified according to regions. Region 1 is attributed to kinetics effects. Region 2 was attributed to kinetics and mass transfer effects. Region 3 was attributed to equilibrium phase. (Abstract shortened by UMI.)