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- W2987318255 abstract "Electrochemical active small organic molecules are potential electrode materials for supercapacitors due to their sustainable and good redox reversibility. However, the poor electrical conductivity restricts their application in supercapacitors. Herein, a water soluble organic dye of methylene blue (MB) has been supported on graphene (GR) through a facile ultrasonic method to form a methylene blue/graphene (MB/GR) composite. A small amount of MB (13%) in MB/GR composite improves the wettability of GR and supplies pseudocapacitance. The MB/GR composite can be used as a binder-free electrode for supercapacitors, and gives a high specific capacitance of 517 F g−1 at 0.5 A g−1 in 0.5 mol L−1 H2SO4 aqueous electrolyte with a satisfactory capacitive retention of 91% after 2000 consecutive cyclic voltammetry tests at 10 mV s−1. Benefiting from the high specific capacitance of MB/GR composite, the as-assembled symmetrical solid-state supercapacitor (MB/GR//MB/GR) delivers a high energy density of 30.36 Wh kg−1 at 0.7 kW kg−1, and excellent cycle stability (nearly 27% drop after 10,000 consecutive constant current charge-discharge at 5 A g−1). This work offers some enlightenment to design and preparation of high-performance electrode materials for supercapacitors." @default.
- W2987318255 created "2019-11-22" @default.
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- W2987318255 date "2020-03-01" @default.
- W2987318255 modified "2023-10-10" @default.
- W2987318255 title "Methylene blue functionalized graphene as binder-free electrode for high-performance solid state supercapacitors" @default.
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- W2987318255 doi "https://doi.org/10.1016/j.jcis.2019.11.007" @default.
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