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Carbon nanotubes/graphitic carbon nitride nanocomposites for all-solid-state supercapacitors

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Abstract

All-solid-state supercapacitors with high power density and working stability are high-efficiency energy storage devices for smart electronic equipment. Developing electrode materials with fast ions and electrons transport is critical to improving the energy storage capability. Here, we report carbon nanotubes/graphitic carbon nitride nanocomposites with large specific surface area, porous structure and high electrical conductivity toward high-performance supercapacitors. The large surface area with porosity provides reservoir for ion accommodation during charge-discharge processes, and the high conductivity facilitates electrons and ions transport. Furthermore, nitrogen sites in electrodes contribute significant pseudocapacitance for supercapacitors. The nanocomposites based device gives a high specific capacity of 148 F g−1 at current density of 1 A g−1 with good rate capability from 1 to 10 A g−1. Additionally, the device displays excellent working stability with capacitance retention of 93% even after 10000 cycles at 1 A g−1 under 0.8 V in air. This study sheds light on design of nanocomposites with highly efficient charge transfer and will accelerate development of next-generation solid state energy devices.

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Authors and Affiliations

  1. Department of Earth and Environmental Engineering, Columbia University, New York, 10027, USA

    Chao Lu & Xi Chen

  2. School of Chemical Engineering, Northwest University, Xi’an, 710069, China

    Xi Chen

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  1. Chao Lu
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  2. Xi Chen
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Correspondence to Xi Chen.

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The supporting information is available online at tech.scichina.com and tech.scichina.com. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

This work was supported by the Earth Engineering Center, and Center for Advanced Materials for Energy and Environment at Columbia University.

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Lu, C., Chen, X. Carbon nanotubes/graphitic carbon nitride nanocomposites for all-solid-state supercapacitors. Sci. China Technol. Sci. 63, 1714–1720 (2020). https://doi.org/10.1007/s11431-019-1554-x

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  • DOI: https://doi.org/10.1007/s11431-019-1554-x

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