Abstract
Ultrathin graphene oxide@polypyrrole-1 (GO@PPy-1) nanosheets are successfully prepared by in situ chemical oxidative polymerization of pyrrole using GO/FeCl3 complexes as the oxidant and template. Pyrrole nanolayers are homogeneously coated on the GO, and both the inner and outer layer monomer can be oxidized by the free Fe3+ ions. The GO@PPy-1 exhibited higher areal specific capacitance (1532 mF cm−2 at 0.88 mA cm−2), better rate capability (capacitance retention rate of 41% from 0.88 to 44 mA cm−2) and excellent cycling stability (less than 10% capacity loss after 1000 cycles) in a three-electrode workstation. More important, the GO@PPy-1 assembled solid-state symmetrical supercapacitor showed high energy density of 114 µWh cm−2 at a power density of 500 µW cm−2 and high power of 20,000 µW cm−2 at an energy density of 70 µWh cm−2. The superior capacitive behavior could be attributed to the thinner PPy capping layer on the surface of GO. In addition, GO-grafted PPy can prevent the exfoliation of PPy during the charge–discharge process. Furthermore, the GO@PPy-1 showed better electrochemical performance compared to the GO@PPy-2 synthesized by the conventional way. The simple method opens up a new route to large-scale prepare graphene based conducting polymer materials for applications in supercapacitors.
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This work was supported by Scientific Research Project of Hunan Provincial Department of Education (20C1020).
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He, Y., Ning, X. & Wan, L. Ultrathin graphene oxide@polypyrrole nanosheets as a supercapacitor electrode with high areal specific capacitance. Polym. Bull. 79, 9075–9091 (2022). https://doi.org/10.1007/s00289-021-03948-8
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DOI: https://doi.org/10.1007/s00289-021-03948-8