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Chemistry and Industry of Forest Products ›› 2022, Vol. 42 ›› Issue (2): 10-18.doi: 10.3969/j.issn.0253-2417.2022.02.002

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Preparation and Electrochemical Properties of Bamboo Based Ultra-thick Carbonaceous Electrode Materials

Tingting YU, Zongze LYU, Xiang LI, Jindong HU, Peiyan LI, Zhiguo LI()   

  1. College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, China
  • Received:2021-03-22 Online:2022-04-28 Published:2022-05-06
  • Contact: Zhiguo LI E-mail:lizgmse@nefu.edu.cn


The 2.5 mm bamboo charcoal ultra-thick electrode material was prepared by direct carbonization of bamboo which preserved its straight pore structure. The bamboo charcoal materials Z-700, Z-800, and Z-900 were prepared at 700, 800 and 900 ℃, which were characterized by SEM, XPS, Raman spectra analysis. The results showed that the original bamboo structure was maintained after carbonization. Among them, the carbonized sample Z-900 owned a higher BET specific surface area(SBET) of 483 m2/g, total pore volume(Vtotal) of 0.23 cm3/g, mesoporous pore volume(Vmes) of 0.05 cm3/g, and micropore volume(Vmic) of 0.18 cm3/g. Electrochemical performance tests showed that the specific capacitance of the prepared ultra-thick bamboo charcoal electrode Z-900 was as high as 22.0 F/cm2 in the 6 mol/L KOH electrolyte with the current density of 10 A/m2. When the current density was 200 A/m2, the specific capacitance still reached 14.5 F/cm2 and the capacitance retention rate was 65.9%. The symmetric supercapacitor Z-900//Z-900 assembled with ultra-thick bamboo charcoal electrode Z-900 owned a specific capacitance of 14 F/cm2 at the current density of 10 A/m2, which had a discharge time of 3 500 s, an energy density of 4.9 W·h/m2, and a power density of 5 W/m2. At the current density of 100 A/m2, the coulomb efficiency could reach 99.8% after 10 000 cycles, and the capacitance retention was 88%, which demonstrated that Z-900 had an excellent electrochemical stability.

Key words: biomass, activated carbon, bamboo, ultra-thick electrode material, supercapacitor

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