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- W2782437478 abstract "We propose a novel and facile synthesis approach to a porous carbon/graphene composite. Graphene is obtained from room-temperature expanded graphite (RTEG), not involving the use of graphite oxide (GO). Porous carbon is acquired by carbonization and KOH-activation of polyvinylpyrrolidone (PVP), which is used to exfoliate RTEG into graphene and inhibit the restacking of the resultant graphene in the present work. The prepared porous carbon/graphene composite has a high specific surface area (SSA) (3008 m2 g−1) and a hierarchical micro- and meso- pore structure (dominant pores in the range of 1–5 nm). Electrochemical measurement demonstrates that the as-prepared porous carbon/graphene composite can deliver an outstanding specific capacitance of up to 340 F g−1 at 5 mV s−1 in 6 M KOH electrolyte. This specific capacitance is among the highest reported so far for porous carbon/graphene materials. Moreover, the prepared composite as an electrode material also exhibits excellent cycling stability (94.4% capacitance retention over 10 000 cycles). The as-fabricated symmetrical supercapacitor exhibits a high energy density of 10.9 W h kg−1 (based on total mass of electrode materials) and an outstanding energy density retention, even at high power density. Compared with conventional preparation routes for porous carbon/graphene composites, the present approach is significantly simple, convenient and cost-effective, which will make it more competent in the development of electrode materials for high-performance supercapacitors." @default.
- W2782437478 created "2018-01-12" @default.
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- W2782437478 date "2018-01-24" @default.
- W2782437478 modified "2023-09-23" @default.
- W2782437478 title "A novel and facile synthesis approach for a porous carbon/graphene composite for high-performance supercapacitors" @default.
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- W2782437478 doi "https://doi.org/10.1088/1361-6528/aaa529" @default.
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