Frequency Dispersion of Double Layer Capacitance of Polyaniline-Coated Electrodes Under the Conducting State

Zhaohao Wang, Koichi Jeremiah Aoki, Jingyuan Chen and Xiangdong Zeng

International Journal of Chemistry, 2018, vol. 10, issue 2, 25-35

Abstract: The double layer capacitance of polyaniline (PANi)-coated electrode in acidic solution exhibited little frequency dispersion under the emeraldine (electrically conducting) state, while it showed large frequency dispersion under the insulating state. The former has a possibility of working as such an ideal capacitor that it may generate neither heat in iterative charge-discharge processes nor leakage of stored charge. The frequency dispersion is generally expressed by f-? for ac-frequency f and a constant . This power law is ascribed to orientation of solvent dipoles rather than non-uniform distribution of ions. The value of under the conducting state was close to zero, implying the orientation to be facilitated by less interaction of solvents. The less interaction was supported indirectly with strain-stress curves of PANi by atomic force microscopy. -Values close to zero were retained even for thick PANi films.

Keywords: frequency dispersion of double layer capacitance; polyaniline-coated electrode; ac-impedance; power law by ac-frequency (search for similar items in EconPapers)
Date: 2018
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