Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 116, Issue 39, Pages 20688-20693Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp303339f
Keywords
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Funding
- NSF ECCS [0925682, 1102481]
- NSF OISE- through PIRE program [0968405]
- Rice University
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [0925682] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1102481] Funding Source: National Science Foundation
- Office Of The Director
- Office Of Internatl Science &Engineering [968405] Funding Source: National Science Foundation
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We report on the performance of supercapacitor devices fabricated using 1-pyrenecarboxylic acid (PCA)-functionalized graphene electrodes. The specific capacitances obtained (using 6 M KOH aqueous solution as an electrolyte) was found to be an order of magnitude higher than nonfunctionalized graphene electrodes (similar to 30 and similar to 200 F/g for pure graphene and PCA-functionalized graphene electrodes, respectively). The analysis of electrochemical impedance spectroscopy using equivalent circuit modeling as well as electrolyte wettability measurements shows a substantial increase in the electrical double layer capacitance due to the PCA functionalization. These findings indicate that PCA functionalization of graphene can significantly enhance the capacitive storage ability of graphene-based electrodes and can act as superb electrode materials in electrical energy applications.
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