A new route for the fabrication of corn starch-based porous carbon as electrochemical supercapacitor electrode material

作者：Pang, Liyun; Zou, Bo; Zou, Yongcun; Han, Xue; Cao, Liyuan; Wang, Wei; Guo, Yupeng^*

来源：Colloids and Surfaces A: Physicochemical and Engineering Aspects , 2016, 504: 26-33.

DOI：10.1016/j.colsurfa.2016.05.049

• Corn starch
• Hydrothermal carbonization
• H3PO4 activation
• Porous carbon
• Supercapacitor

A new route has been developed for the fabrication of porous carbon from corn starch by a two-step process: hydrothermal carbonization and chemical activation with H3PO4. The as-prepared porous carbons were characterized by scanning electron microscopy, powder X-ray diffraction, fourier transform infrared spectra, C, H, N, O, S analyzer, N-2 adsorption, zeta potential measurements, cyclic voltammetry and galvanostatic charge/discharge techniques. A blocky structure morphology of the porous carbon was achieved. The porous carbons showed a high specific surface area of 1239 m(2) g(-1) and a large pore volume of 1.40 cm(3) g(-1). The electrode delivered higher specific capacitance (144 F g(-1)) and energy density (19.9 Wh kg(-1) at a power density of 311 W kg(-1)) than commercial porous carbon at a current density of 0.625 A g(-1) in 6 mol L-1 KOH electrolyte. Also, the supercapacitor device exhibited superior cycling stability. The results demonstrated that corn starch-based porous carbons will be a kind of promising electrochemical supercapacitor electrode materials.

• 出版日期2016-9-5
• 单位吉林大学