Abstract
Flexible nanoporous nitrogen-doped graphene film ( PNGF) prepared by facile hydrothermal ammonia reaction of nanoporous graphene oxide film (PGOF) is reported. The specific capacitance of the PNGF are 468 F g−1 at a scan rate of 2 mV s−1. The capacity retention after 10,000 charge/discharge cycles at a current density of 1 A g−1 is more than 81%. Two-electrode symmetric supercapacitor in a 6 M KOH aqueous electrolyte solution was fabricated, delivering a maximum power density of 5000 W kg−1 (at the energy density of 4.17 W h kg−1) and the maximum energy density of 6.43 W h kg−1 (at the power density of 150 W kg−1). The enhanced electrochemical performance can be attributed to nitrogen doped and the unique graphene film nanostructure. The expansion nanoporous structure of layer by layer plays the role of an “ion-buffering” reservoir, offering nano-channels for liquid electrolyte penetration by enlarging the specific surface area of PNGF efficiently. This flexible nanoporous gaphene film significantly suggests a broad range of application for fabricating high performance and novel energy storage devices.
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Acknowledgements
This work was supported by Priority Academic Program Development of Jiangsu Higher Education Institutions, the National Basic Research Program of China (973 Program) (No. 2014CB239701), National Natural Science Foundation of China (No. 51372116, 51372115), Fundamental Research of Nanjing University of Aeronautics and Astronautics (NJ20150050).
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Yue, S., Tong, H., Gao, Z. et al. Fabrication of flexible nanoporous nitrogen-doped graphene film for high-performance supercapacitors. J Solid State Electrochem 21, 1653–1663 (2017). https://doi.org/10.1007/s10008-017-3538-y
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DOI: https://doi.org/10.1007/s10008-017-3538-y