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In Situ Intercalating Expandable Graphite for Mesoporous Carbon/Graphite Nanosheet Composites as High-Performance Supercapacitor Electrodes

Authors

  • Dr. Lei Wang,

    1. Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080 (P.R. China), Fax: (+86) 451-8666-1259
    2. State Key Laboratory of Theoretical and Computation Chemistry, Jilin University, Changchun 130023 (P.R. China)
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  • Dr. Guang Mu,

    1. Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080 (P.R. China), Fax: (+86) 451-8666-1259
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  • Dr. Chungui Tian,

    1. Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080 (P.R. China), Fax: (+86) 451-8666-1259
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  • Dr. Li Sun,

    1. Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080 (P.R. China), Fax: (+86) 451-8666-1259
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  • Dr. Wei Zhou,

    1. Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080 (P.R. China), Fax: (+86) 451-8666-1259
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  • Dr. Taixing Tan,

    1. Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080 (P.R. China), Fax: (+86) 451-8666-1259
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  • Prof. Honggang Fu

    Corresponding author
    1. Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080 (P.R. China), Fax: (+86) 451-8666-1259
    2. State Key Laboratory of Theoretical and Computation Chemistry, Jilin University, Changchun 130023 (P.R. China)
    • Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080 (P.R. China), Fax: (+86) 451-8666-1259
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Abstract

Mesoporous-carbon-coated graphite nanosheet (GNS@MC) composites have been synthesized by the intercalation of resol prepolymer into the interlayers of expandable graphite (EG) under vacuum-assisted conditions, followed by the exfoliation of EG through in situ polymerization, the growth of resol under hydrothermal conditions, and carbonization under Ar. The GNS@MC composites exhibit enhanced capacitive performance compared to mesoporous carbon (MC), microwaved EG after thermal treatment (T-EG), and the physical mixture of MC and T-EG (MC+T-EG). In particular, the GNS@MC-35-800 composite carbonized at 800 °C, which has a graphite-nanosheet content of 35 % and a Brunauer–Emmett–Teller surface area (SBET) of 432.3 m2 g−1, exhibits the highest capacitance of 203 F g−1 at 1 A g−1 in 6 M KOH electrolyte. Furthermore, the GNS@MC-35-800 composite exhibits a good cyclic stability with 95 % capacitance retention and a high columbic efficiency of 99 % after 5000 cycles. The energy density of the symmetric supercapacitor GNS@MC-35-800/GNS@MC-35-800 achieved was as high as 11.5 Wh kg−1 at a high power density of 10 kW kg−1. This good performance is attributable to the GNSs in the GNS@MC composite facilitating electron transport owing to its excellent conductivity; moreover, the MC in GNS@MC favors the rapid diffusion of ions by providing low-resistance pathways. The GNS@MC composite may find application in high-performance energy storage and conversion devices.

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