Interfacial capacitance of single layer graphene

The interfacial capacitance of large area, single layer graphene was directly measured with electrolyte accessing both sides of the graphene sheet. PMMA and photoresist patterns were used as supports to suspend the CVD grown graphene in electrolyte during electrochemical testing. Both one and two si...

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Published inEnergy & environmental science Vol. 4; no. 11; pp. 4685 - 4689
Main Authors Stoller, Meryl D, Magnuson, Carl W, Zhu, Yanwu, Murali, Shanthi, Suk, Ji Won, Piner, Richard, Ruoff, Rodney S
Format Journal Article
LanguageEnglish
Published 01.01.2011
Subjects
Capacitance
Capacitors
Charge
Electrolytes
Electrolytic cells
Energy storage
Graphene
Polymethyl methacrylates
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Summary:The interfacial capacitance of large area, single layer graphene was directly measured with electrolyte accessing both sides of the graphene sheet. PMMA and photoresist patterns were used as supports to suspend the CVD grown graphene in electrolyte during electrochemical testing. Both one and two sides of single layer graphene films were measured and compared. The results show that the area normalized charge that can be stored simultaneously on both sides is significantly lower than could be stored on just one side of single layer graphene, consistent with charge storage having a quantum capacitance component. These measurements are also consistent with the specific capacitance of graphene materials as previously measured in supercapacitor cells and provide a basis for the further understanding and development of graphene based materials for electrical energy storage.
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ISSN:1754-5692
1754-5706
DOI:10.1039/C1EE02322E