Abstract
Graphene-carbon nanofiber/MnO2 nanocomposite paper (GMP) is prepared via a simple chemical reaction between KMnO4 and carbon materials in acidic solution, in which MnO2 nanosheets are uniformly deposited on the graphene-carbon nanofiber paper. Owing to its freestanding structure, GMP is directly used as an electrode in the electrochemical tests without addition of any binders or conductive additives. Encouragingly, GMP exhibits an excellent capacitive performance with a high specific capacitance of 298.2 F g−1 at 1 A g−1 in 1 M Na2SO4 electrolyte. Meanwhile, this composite paper can withstand high scan rate loads without a large decrease of capacitance, the specific capacitance can be remaining at 370.4 F g−1 even at 300 mV s−1. In the cycling test, the composite paper presents an outstanding stability with 95.7 % capacitance retention after 3000 cycles. Additionally, the asymmetric supercapacitor is fabricated based on GMP electrode, it not only shows a high operating voltage of 2.0 V but also exhibits a high energy density of 23.0 Wh kg−1 at 450.8 W kg−1. Therefore, this kind of composite paper would be promising as electrode materials for flexible and high performance supercapacitors.
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The authors acknowledge the funds from the Chinese National Natural Science Foundation (Nos.51372278).
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Prime novelty statement
1. A simple route to synthesize flexible graphene-carbon nanofiber/MnO2 nanocomposite paper (GMP) .
2. The GMP has free-standing structure to be directly used as electrode without any binders and conductive additives.
3. The GMP electrode exhibits excellent capacitive performance and good cycling life at high current density.
4. GMP-based asymmetric supercapacitor shows a high energy density of 23.0 Wh kg−1 at 450.8 W kg−1.
5. The GMP electrode holds a promising application in flexible supercapacitors.
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Wu, Y., Liu, S., Zhao, K. et al. Chemical deposition of MnO2 nanosheets on graphene-carbon nanofiber paper as free-standing and flexible electrode for supercapacitors. Ionics 22, 1185–1195 (2016). https://doi.org/10.1007/s11581-015-1625-6
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DOI: https://doi.org/10.1007/s11581-015-1625-6