New progress in the research of graphene-based linear series supercapacitors

Recently, Prof. Wu Zhongshuai and Professor Bao Xinhe, two-dimensional materials and energy device research team of Dalian Institute of Chemical Physics, Chinese Academy of Sciences, have made new progress in the research of new concept, planarization and self-integrated graphene-based supercapacitors, and have taken the lead in proposing efficient spraying methods. A graphene-based linear series supercapacitor with a high voltage output was prepared, and the related results were published in Advanced Materials (DOI: 10.100). The rapid development of miniaturized and flexible electronic devices has greatly stimulated the demand for micro energy storage devices. Traditional single supercapacitors have low output voltage (<1.0V in water system). The processing steps of multiple non-planar energy storage devices are complicated and require metal connectors, which greatly reduces the modular integration and mechanical flexibility of supercapacitors. Sex, it is difficult to meet the application requirements of future electronic devices for high voltage actual scenarios. Therefore, there is an urgent need to develop innovative device configurations and large-scale device fabrication methods to achieve efficient fabrication of new energy storage devices with high voltage outputs. The research team first used a mixture of electrochemically stripped graphene and conductive polymer PH1000 (poly 3,4-ethylenedioxythiophene-polystyrenesulfonic acid) as a highly conductive ink, sprayed with the aid of a mask. The method is to prepare a planar supercapacitor module which is self-connected by ten linear devices on A4 paper, and the obtained device has good mechanical flexibility, and can stably output a high voltage of 8V in the aqueous electrolyte without using metal connection. body. In order to increase the specific capacity of a single device, a high-capacity polyaniline functionalized graphene is used as an electrode material, and a linear series supercapacitor is also manufactured, which has a high tantalum capacitance and maintains a good series behavior. In order to further increase the output voltage of a single device, two kinds of two-dimensional materials, manganese dioxide nanosheets and electrochemically stripped graphene, were selected as the positive and negative electrodes of the supercapacitor, respectively, and an asymmetric linear series super was successfully fabricated on one substrate. The capacitors extend the output voltage from 1.8V for a single asymmetric supercapacitor to 5.4V for three linear series supercapacitors, further increasing the output voltage and energy density of the device. This study demonstrates the wide applicability of graphene and other two-dimensional materials in the fabrication of linear series supercapacitors with symmetrical and asymmetrical structures, while providing a means for fabricating planar, flexible, integrated energy storage devices. New strategy.

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