Self-assembled activated carbon sandwiched graphene film for symmetrical supercapacitors
Yuan-yuan Wu , Lian-wen Zhu , Ru-ting Chen , Li Gu , Xue-bo Cao , Shao-rong Lu
Journal of Central South University ›› 2020, Vol. 27 ›› Issue (12) : 3603 -3614.
Self-assembled activated carbon sandwiched graphene film for symmetrical supercapacitors
Activated carbon (AC) particles sandwiched reduced graphene oxide sheets (rGO) film has been successfully fabricated via a facile self-assemble approach. The as-formed AC/rGO film is self-standing, flexible and mechanically robust, allowing to be transferred to any substrate on demand without rupture. Since AC particles effectively suppressed the restacking of the rGO sheet, AC/rGO film exhibits loose layer-by-layer stacking structures with various gaps between AC particles and rGO sheets, which is different from compact structures of pure graphene films. The as-formed gaps provide fast diffusion channels for electrolyte ions and enhanced accessible surface area of rGO. Therefore, the AC/rGO electrode delivers improved electrochemical performance over the voltage range of 0.0—3.0 V. This work offers a promising strategy to design free-standing supercapacitor electrodes based on traditional nanocarbon materials.
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