Self-assembled activated carbon sandwiched graphene film for symmetrical supercapacitors
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Self-assembled activated carbon sandwiched graphene film for symmetrical supercapacitors WU Yuan-yuan(武圆圆)1, 2, ZHU Lian-wen(朱连文)3, CHEN Ru-ting(陈汝婷)4, GU Li(谷俐)1, 2, CAO Xue-bo(曹雪波)3, LU Shao-rong(陆绍荣)1 1. College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China; 2. School of Materials and Textile Engineering, Jiaxing University, Jiaxing 314001, China; 3. College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001,China; 4. Department of Materials, Imperial College London, London, SW72AZ, United Kingdom © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: 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. Key words: graphene film; activated carbon; self-assembly; supercapacitor Cite this article as: WU Yuan-yuan, ZHU Lian-wen, CHEN Ru-ting, GU Li, CAO Xue-bo, LU Shao-rong. Self-assembled activated carbon sandwiched graphene film for symmetrical supercapacitors [J]. Journal of Central South University, 2020, 27. DOI: https://doi.org/10.1007/s11771-020-4505-9.
1 Introduction Along with the rapid growth of market demands for wearable and portable electronics, including smart cloths, roll-up displays, electronic sensors, there is an urgent need for developing equally flexible energy storage devices, such as flexible supercapacitors and batteries [1−3]. Unlike batteries, which chemically store electric energy, supercapacitors, particularly electrochemical double layer capacitors (EDLCs), which store and release
energy through physical processes, in which ions are reversibly adsorbed-desorbed at the electrode/ electrolyte interface [4−8], this fast charging/ discharging process don’t involve phase and composition changes, enabling EDLCs with unrivaled durability (>100000 cycles), excellent safety, wide range of operating temperature, and high-power-density [7−9]. However, the assembly of traditional supercapacitor devices often involves the use of current collector, binder and conductive additive, which dramatically drag down the specific energy density [10, 11].
Foundation item: Project(21673102) supported by the National Natural Sc
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