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Issue 35, 2013
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Cycling characteristics of high energy density, electrochemically activated porous-carbon supercapacitor electrodes in aqueous electrolytes

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Abstract

Carbon-based supercapacitors typically have low energy density but high cycle lifetime relative to batteries. Surface functionalization can significantly increase charge storage through reversible faradaic reactions at the electrode/electrolyte interface, a phenomenon known as pseudocapacitance. However, pseudocapacitive reactions, if not completely reversible, can contribute to reduced cycling performance. In this letter, we describe an electrochemical activation procedure on porous carbon synthesized via pyrolysis of photoresist which yields high specific capacitance and energy density of ∼250 F cm−3 and 35 mW h cm−3. We also demonstrate that the choice of aqueous electrolyte has a significant effect on both overall capacitance and cycle lifetime, through a comparison of KCl and H2SO4 electrolytes. Cycling in acid electrolyte yields excellent capacitance retention of 97% after 10 000 cycles.

Graphical abstract: Cycling characteristics of high energy density, electrochemically activated porous-carbon supercapacitor electrodes in aqueous electrolytes

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Article information


Submitted
28 Apr 2013
Accepted
10 Jul 2013
First published
12 Jul 2013

J. Mater. Chem. A, 2013,1, 10518-10523
Article type
Paper

Cycling characteristics of high energy density, electrochemically activated porous-carbon supercapacitor electrodes in aqueous electrolytes

B. Hsia, M. S. Kim, C. Carraro and R. Maboudian, J. Mater. Chem. A, 2013, 1, 10518
DOI: 10.1039/C3TA11670K

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