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Author: search.filters.author.Sukjit, PeemasesSubject: search.filters.subject.Electrolytic exfoliation

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    Electrolytic exfoliation of few-layer graphene/sodium dodecylbenzenesulfonate for coin- and cylindrical-cell supercapacitor electrodes
    (2023-06-01)
    Lomas, Tanom
    ;
    Poochai, Chatwarin
    ;
    Sukjit, Peemases
    ;
    Wasapinyokul, Kamol
    ;
    Mensing, Johannes P.
    Electrolytic exfoliation of graphite is a promising way to produce graphene quickly, inexpensively, and in an environmentally friendly manner. In this research, sodium dodecylbenzenesulfonate (SDBS), a commonly used anionic surfactant, was dissolved in 1 M H<inf>2</inf>SO<inf>4</inf> to produce SDBS-graphene via electrolytic graphite exfoliation. The AFM analysis validated the thickness of few-layer of SDBS-graphene between 5 and 15 nm. Then, a symmetric coin-cell (CR2032) supercapacitor (SC) comprised of SDBS-graphene and rGO (synthesized via Hummer's method) was assembled with 0.5 M H<inf>2</inf>SO<inf>4</inf> as an electrolyte. The highly exfoliated SDBS-graphene demonstrated a greater capacitive electrochemical response than rGO. The CV and GCD techniques revealed that the specific capacitance of SDBS-graphene was 150 F g<sup>−1</sup> at 0.25 A g<sup>−1</sup> with 20.4 Wh kg<sup>−1</sup> of energy density and 494 W kg<sup>−1</sup> of power density and that its percentage capacitive retention remained 95 % after 10,000 cycles at 3 A g<sup>−1</sup>, compared to the specific capacitance of reduced graphene. In addition, a cylindrical cell SC (CR32650) with SDBS-graphene demonstrated a capacitance of 220 F at 100 mA, along with an energy density of 33 kWh and a power density of 55 kW. This suggests that exfoliated SDBS-graphene may be utilized in SCs with high efficiency and long-term durability.