Two-dimensional mesoporous carbon sheet-like framework material for high-rate supercapacitors
2013
Wang, Qian | Yan, Jun | Wei, Tong | Feng, Jing | Ren, Yueming | Fan, Zhuangjun | Zhang, Milin | Jing, Xiaoyan
Two-dimensional mesoporous carbon sheet-like framework (MCSF) material has been prepared using mesoporous SiO₂ nanosheet as template and coal tar pitch as carbon precursor. MCSF sheets consisting of numerous mesopores have a specific surface area of 582.7m²g⁻¹. As a result, the MCSF electrode possesses a maximum specific capacitance of 264Fg⁻¹ at 5mVs⁻¹, excellent rate capability (74% retention ratio at 1000mVs⁻¹), and impressive cycling stability with 91% initial capacitance retained after 5000 cycles at 200mVs⁻¹ in 6molL⁻¹ KOH. MCSF symmetric supercapacitor exhibits a maximum energy density of 9.6Whkg⁻¹ at 5mVs⁻¹ and a maximum power density of 119.4kWkg⁻¹ based on the total mass of the two electrodes in 1molL⁻¹ Na₂SO₄ electrolyte.
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