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A Flexible and High-Voltage Internal Tandem Supercapacitor Based on Graphene-Based Porous Materials with Ultrahigh Energy Density

Authors

  • Fan Zhang,

    1. Key Laboratory of Functional Polymer Materials and Centre of Nanoscale Science and Technology, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, China
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  • Yanhong Lu,

    1. Key Laboratory of Functional Polymer Materials and Centre of Nanoscale Science and Technology, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, China
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  • Xi Yang,

    1. Key Laboratory of Functional Polymer Materials and Centre of Nanoscale Science and Technology, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, China
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  • Long Zhang,

    1. Key Laboratory of Functional Polymer Materials and Centre of Nanoscale Science and Technology, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, China
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  • Tengfei Zhang,

    1. Key Laboratory of Functional Polymer Materials and Centre of Nanoscale Science and Technology, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, China
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  • Kai Leng,

    1. Key Laboratory of Functional Polymer Materials and Centre of Nanoscale Science and Technology, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, China
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  • Yingpeng Wu,

    1. Key Laboratory of Functional Polymer Materials and Centre of Nanoscale Science and Technology, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, China
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  • Yi Huang,

    1. Key Laboratory of Functional Polymer Materials and Centre of Nanoscale Science and Technology, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, China
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  • Yanfeng Ma,

    1. Key Laboratory of Functional Polymer Materials and Centre of Nanoscale Science and Technology, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, China
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  • Yongsheng Chen

    Corresponding author
    1. Key Laboratory of Functional Polymer Materials and Centre of Nanoscale Science and Technology, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, China
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Abstract

Pursuing higher working voltage and packaged energy density, an internal tandem supercapacitor has been successfully designed and fabricated based on graphene-based porous carbon hybrid material. Compared with the packaged energy density of 27.2 Wh kgcell −1 and working voltage of 3.5 V using EMIMBF4 electrolyte for the conventional single-cell supercapacitor, the internal tandem device with the same material achieves a much higher working voltage of 7 V as well as a significantly improved energy density of 36.3 Wh kgcell −1 (increased by 33%), which is also about 7 times of that of the state-of-art commercial supercapacitors. A flexible internal tandem device is also designed and fabricated and demonstrated similar excellent performance.

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