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Determination of The Energy Efficiency of Polymer Electrolyte Membrane-Fuel Cell by Digital Shearography and Electrochemical Impedance Spectroscopy

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A new concept of the energy efficiency of polymer electrolyte membrane-fuel cell (PEM-FC) is proposed for the first time by a combination of the digital shearography and the electrochemical impedance spectroscopy (EIS). The digital shearography will be used to determined the in-plane displacement of the PEM during the EIS of the PEM-FC. In the meantime, the data of the EIS of the PEM-FC will be utilized to measure the alternating current (A.C) impedance (Z) of the PEM at low frequency. Then, the in-plane displacement (Δd) of the PEM will be correlated to the alternating current (A.C) impedance of the PEM in order to calculate the conductivity (σ) of the PEM. The change of the ratio of the conductivity of the PEMs (σt) after a certain hours of operation (dehydration) of PEM-FC to the initial conductivity of PEM (σi) would lead to the determination of the energy efficiency (the output current) of PEM-FC. The limit of ratio of (σt)/(σi) is expected to decrease as a function of operational time due to the deterioration (dehydration) of the PEM. Consequenly, the limit of ratio of (σt)/(σi) will be plotted versus the operational time (dehydration) of the PEM-FC.

© 2013 Optical Society of America

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