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It is important to measure in-plane conductivity of Nafion membrane for fuelcell, but this target is generally inhibited by measuring system withheterogeneous interfaces and immature electrochemical measurements. This papersimply used water media to establish stable measuring system with metalelectrode and Nafion membrane, representing system as equivalent circuit. Ourequivalent circuit was validated by both cyclic voltammetry (CV) andelectrochemical impedance spectroscopy (EIS) measurements, also clarifiedconnection and difference in two measurements. This electrochemistrybreakthrough helps realize measuring system completely and reliably even undersuccessive temperature cycles, providing circuit elements for kinetic analysisin contact resistance, in-plane conductivity, inactive and active proton. Wealso clarified that the inactive and active proton shift can dictate lowfrequency inductance, which is an important sign for active and stableoperation in fuel cell, secondary battery and materials. All these results caninduce enormous progress in multi-disciplines, making our work have greatsignificance and broad impact for future studies.

To Measure In-plane conductivity of Nafion membrane with general electrochemical approach