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Science. 2013 Aug 2;341(6145):534-7. doi: 10.1126/science.1239089.

Liquid-mediated dense integration of graphene materials for compact capacitive energy storage.

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1
Department of Materials Engineering, Monash University, Clayton, VIC 3800, Australia.

Abstract

Porous yet densely packed carbon electrodes with high ion-accessible surface area and low ion transport resistance are crucial to the realization of high-density electrochemical capacitive energy storage but have proved to be very challenging to produce. Taking advantage of chemically converted graphene's intrinsic microcorrugated two-dimensional configuration and self-assembly behavior, we show that such materials can be readily formed by capillary compression of adaptive graphene gel films in the presence of a nonvolatile liquid electrolyte. This simple soft approach enables subnanometer scale integration of graphene sheets with electrolytes to form highly compact carbon electrodes with a continuous ion transport network. Electrochemical capacitors based on the resulting films can obtain volumetric energy densities approaching 60 watt-hours per liter.

PMID:
23908233
DOI:
10.1126/science.1239089
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