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International Journal of Electrochemistry
Volume 2015, Article ID 801217, 6 pages
Research Article

Investigation of Imbalanced Activated Carbon Electrode Supercapacitors

1School of Chemical & Chemical Engineering, Bohai University, Jinzhou 121013, China
2School of Materials Science & Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0295, USA
3Interfacial Molecular Spectroscopy Group, Fritz-Haber-Institute of the Max Planck Society, 14195 Berlin, Germany

Received 17 October 2015; Accepted 15 December 2015

Academic Editor: Abel C. Chialvo

Copyright © 2015 Tieshi He et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Imbalanced supercapacitor was constructed by using various ratio of activated carbon (AC) of positive to negative electrode. The electrochemical behavior of imbalanced supercapacitor was investigated using 1.0 M spiro-(1,1′)-bipyrrolidinium tetrafluoroborate electrolyte in propylene carbonate. The results showed that there are some factors that influenced the imbalanced supercapacitor with different AC ratio of positive to negative electrode, the utilization of AC, electrode potential distribution, and life cycle. The imbalanced supercapacitor with an AC weight ratio of 80 : 120 of positive to negative electrode has an average potential distribution in each electrode, and it revealed the best electrochemical performance: specific capacitor was 39.6 Fg−1, while the charge-discharge efficiency was 97.2% after 2000 life cycle tests.