Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (11): 1323-1332.DOI: 10.11944/j.issn.1000-0518.2019.11.190102

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Synthesis and the Electrochemical Energy Storage of Porous Biomass Carbon from Corn Stalk

DENG Junfeiab,DU Weimina*(),WANG Mengyaoa,WEI Qinghea   

  1. a College of Chemistry and Chemical Engineering,Anyang Normal University,Anyang,He'nan 455000,China
    b Zhengyi High School,Anyang,He'nan 455000,China
  • Received:2019-04-15 Accepted:2019-07-11 Published:2019-11-01 Online:2019-11-05
  • Contact: DU Weimin
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.U1404203), the Program for Innovative Research Team of Science and Technology in the University of Henan Province(No.16IRTSTHN003), and the Special Projects of New Energy Vehicle Development of Anyang City(No.2017-480-15)

Abstract:

Porous biomass carbon with high specific surface area(2167 m2/g) was prepared from corn stalk. By optimizing the experimental conditions, porous biomass carbon material with the best performance can be obtained with specific capacitance of 390 F/g at a current density of 1 A/g. More importantly,liquid-phase symmetric supercapacitors were assembled with the optimal porous biomass carbon as the electrode material and 3 mol/L KOH solution as the electrolyte. The present symmetrical supercapacitors have an energy density of 7 Wh/kg at the power density of 818 W/kg, and 91.1% capacitance retention after 10000 cycles. Meanwhile, after charged, two such supercapacitors in series can easily illuminate 15 LED lights and drive the small fans to work normally. These results indicate that porous biomass carbon from corn stalks has great practical significance as an advanced electrode material for supercapacitors.

Key words: corn stalks, biomass carbon, symmetrical, supercapacitors, energy storage