A water-dielectric capacitor using hydrated graphene oxide film

Wang, Da-Wei, Du, Aijun, Taran, Elena, Lu, Gao Qing (Max), & Gentle, Ian R. (2012) A water-dielectric capacitor using hydrated graphene oxide film. Journal of Materials Chemistry, 22(39), pp. 21085-21091.

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Despite the widespread use of paper, plastic or ceramics in dielectric capacitors, water has not been commonly used as a dielectric due to its tendency to become conductive as it easily leaches ions from the environment. We show here that when water is confined between graphene oxide sheets, it can retain its insulating nature and behave as a dielectric. A hydrated graphene oxide film was used as a dielectric spacer to construct a prototype water-dielectric capacitor. The capacitance depends on the water content of the hydrated GO film as well as the voltage applied to the device. Our results show that the capacitance per unit area of the GO film is in the range of 100–800 mF cm �2, which is 5–40 times that of the double layer capacitance per surface area of activated carbon.

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ID Code: 59769
Item Type: Journal Article
Refereed: Yes
DOI: 10.1039/c2jm34476a
ISSN: 0959-9428
Deposited On: 07 May 2013 23:53
Last Modified: 08 May 2013 22:18

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