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


  •  Zhaohao Wang    
  •  Koichi Aoki    
  •  Jingyuan Chen    
  •  Xiangdong Zeng    

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-l for ac-frequency f and a constant l. This power law is ascribed to orientation of solvent dipoles rather than non-uniform distribution of ions. The value of l 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. l-Values close to zero were retained even for thick PANi films.



This work is licensed under a Creative Commons Attribution 4.0 License.
  • Issn(Print): 1916-9698
  • Issn(Onlne): 1916-9701
  • Started: 2009
  • Frequency: quarterly

Journal Metrics

Google-based Impact Factor (2018): 10.07

h-index (August 2018): 23

i10-index (August 2018): 76

h5-index (August 2018): 9

h5-median(August 2018): 14

( The data was calculated based on Google Scholar Citations. Click Here to Learn More. )

Contact