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Issue 39, 2012
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A water-dielectric capacitor using hydrated graphene oxide film

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Abstract

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 μF cm−2, which is 5–40 times that of the double layer capacitance per surface area of activated carbon.

Graphical abstract: A water-dielectric capacitor using hydrated graphene oxide film

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Article information


Submitted
09 Jul 2012
Accepted
24 Aug 2012
First published
05 Sep 2012

J. Mater. Chem., 2012,22, 21085-21091
Article type
Paper

A water-dielectric capacitor using hydrated graphene oxide film

D. Wang, A. Du, E. Taran, G. Q. (. Lu and I. R. Gentle, J. Mater. Chem., 2012, 22, 21085
DOI: 10.1039/C2JM34476A

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