A Test Method of a PEFC Single Cell with Reference Electrodes

Abstract

A test method of a PEFC single cell with reference electrodes for obtaining correct polarization curves is proposed, where the anode polarization curves of H2/O2 and H2/Air should be approximately equal. Measured anode polarization curves are usually linear to the current density but not ohmic. Leak current between cathode and reference electrode causes voltage shift on the anode polarization curve. In order to obtain the ohmic anode polarization, the measured anode polarization curve should be moved vertically up to overlap with the base point. Configuration of the electrode edge adjacent to the reference electrode gives a significant effect on the anode and cathode potential. Polarization of a electrode which is 0.5mm nearer to the reference electrode than the other electrode does not include the ohmic loss of the membrane. Polarization of the other electrode includes the ohmic loss of the membrane instead.