Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (4): 20220653.doi: 10.7503/cjcu20220653

• Articles: Inorganic Chemistry • Previous Articles     Next Articles

Synthesis of Biochar Derived from Jujun Grass and the Application in Supercapacitors

LIU Junhui1, LI Zijia1, WU Shuchang2, XIE Zailai1, CHEN Yiquan1()   

  1. 1.College of Chemistry,Fuzhou University,Fuzhou 350108,China
    2.School of Pharmaceutical and Chemical Engineering,Taizhou University,Taizhou 318000,China
  • Received:2022-10-03 Online:2023-04-10 Published:2022-12-27
  • Contact: CHEN Yiquan E-mail:t08028@fzu.edu.cn
  • Supported by:
    the Ministry of Education Industry-school Cooperative Education Project, China(202102249018);the National Natural Science Foundation of China(22072018)

Abstract:

The powder carbonaceous material(JPC) was obtained by pre-carbonizing Jujun grass at low temperature, and then activated with different proportions of KOH at different temperatures, amorphous carbon material(JPCK1) with microporous and mesoporous distribution was obtained. The specific surface area of the synthesized carbon JPCK1-900-4X is up to 3368 m2/g, with large pore volume and 0.95%(atomic percent) nitrogen content. Electrochemical tests showed that JPCK1-900-4X has good energy storage potential in supercapacitor applications. When the current density is 0.5 A/g, the specific capacitance is 311.7 F/g, and when the current density is increased to 10 A/g, the specific capacitance is 230 F/g. After 5000 cycles of charging and discharging at the current density of 10 A/g, the capacitance retention rate is 97.5%, which indicates that it has good stability. In the two-electrode system, when the power density is 250 W/kg, the energy density can reach 17.7 W·h/kg.

Key words: Biomass, Hard template, Porous carbon, Nitrogen doping, Supercapacitor

CLC Number: 

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