Issue 27, 2013

Improved performance of electric double layer capacitor using redox additive (VO2+/VO2+) aqueous electrolyte

Abstract

Electric double layer capacitors (EDLCs) were fabricated using biomass derived porous activated carbon as electrode material with 1 M H2SO4 and VOSO4 added 1 M H2SO4 as electrolytes. Here, VOSO4 was used as redox additive to improve the overall performance of EDLC. As expected, the VOSO4 electrolyte showed ∼43% of improved specific capacitance of 630.6 F g−1 at 1 mA cm−2 compared to pristine 1 M H2SO4 (440.6 F g−1) due to the contribution of VO2+/VO2+ redox reaction at the electrode–electrolyte interface. Possible redox reaction mechanism of VO2+/VO2+ pair is also briefly illustrated. The good cycling performance of 97.57% capacitance retention was observed even after 4000 cycles. For comparison, the polymer gel electrolyte (PVA/VOSO4/H2SO4) was also prepared and then the performance of the fabricated EDLCs was studied. Overall, these findings could open up a simple and cost effective way to improve the performance of EDLCs significantly.

Graphical abstract: Improved performance of electric double layer capacitor using redox additive (VO2+/VO2+) aqueous electrolyte

Supplementary files

Article information

Article type
Paper
Submitted
09 Mar 2013
Accepted
22 Apr 2013
First published
29 May 2013

J. Mater. Chem. A, 2013,1, 7913-7919

Improved performance of electric double layer capacitor using redox additive (VO2+/VO2+) aqueous electrolyte

S. T. Senthilkumar, R. K. Selvan, N. Ponpandian, J. S. Melo and Y. S. Lee, J. Mater. Chem. A, 2013, 1, 7913 DOI: 10.1039/C3TA10998D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements