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An ultrahigh volumetric capacitance of squeezable three-dimensional bicontinuous nanoporous graphene
1WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan. mwchen@wpi-aimr.tohoku.ac.jp and School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China.
Abstract:
Graphene with a large specific surface area and high conductivity has a large specific capacitance. However, its volumetric capacitance is usually very low because the restacking of 2D graphene sheets leads to the loss of the large ion-accessible surface area. Here we report squeezable bicontinuous nanoporous nitrogen-doped graphene, which is extremely flexible and can tolerate large volume contraction by mechanical compression without the face-to-face restacking occurring. The compressed nanoporous N-doped graphene with a large ion accessible surface area and high conductivity shows an ultrahigh volumetric capacitance of ∼300 F cm-3 together with excellent cycling stability and high rate performance.
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