Effect of operational parameters on the performance of PEMFC assembled with Au-coated Ni-foam

Abstract

An innovative proton exchange membrane fuel cell was assembled using Au-coated nickel foam instead of the conventional flow field (carbon plate). The effect of operational parameters on the performance of this cell was investigated by DC polarization and electrochemical impedance spectroscopy techniques. Parameters such as cell operating temperature, cathode humidification temperature, and cathode-gas stoichiometry were of concern.Our results indicate that the testing temperature is increased from 40 °C to 60 °C, the power density increases, charge-transfer resistance decreases. When the cathode humidification temperature increases from 50 °C to 70 °C, the power density decreases. This is ascribed to an increase in mass-transfer resistance of the cell from 0.009 to 0.032 Ω, possibly because of partial flooding. The cell also performs better if cathode-gas stoichiometry is increased from 2 to 5. A maximum power density of 791.6 mW/cm2 was realized under the following optimal conditions: a testing temperature of 60 °C, cathode humidification temperature of 50 °C, and cathode-gas stoichiometry of 5.