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Chemistry and Industry of Forest Products ›› 2022, Vol. 42 ›› Issue (2): 47-55.doi: 10.3969/j.issn.0253-2417.2022.02.007

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Preparation and Electrochemical Performance Analysis of Enzymatic Hydrolyzed Lignin Carbon

Tingting HU1, Shuhui TONG2, Jiaqi WEI1, Lei ZHANG3, Jianing ZHAO1,*()   

  1. 1. College of Materials Science and Engineering, Northeast Forestry University, Harbin 150040, China
    2. Harbin Aircraft Industry Group Co., Ltd., Harbin 150000, China
    3. College of Materials Science and Engineering, School of Mechanical and Electrical Engineering, Harbin 150040, China
  • Received:2021-10-09 Online:2022-04-28 Published:2022-05-06
  • Contact: Jianing ZHAO E-mail:jianingzhaonefu@163.com


Corn straw enzymatic hydrolyzed lignin carbon LC1, LC2and LC3 were prepared using purified corn straw enzymatic hydrolyzed lignin as carbon source and carbonized at high temperature under N2 conditions for 1, 2 and 3 h. SEM, TEM and nitrogen adsorption/desorption curve were used to analyze the prepared carbon materials. The results showed that LC1, LC2 and LC3 had microporous, mesoporous and macroporous structures with specific surface areas of 894.75, 1 376.74 and 776.47 m2/g, respectively. The pore volumes of the samples were 0.41, 0.70 and 0.40 cm3/g, respectively. XRD and Raman spectrum showed that the order of the enzymatic hydrolyzed lignin carbon increased with the prolongation of carbonization time. XPS analysis showed that the enzymatic hydrolyzed lignin carbon mainly contained C, O and N(small amount) elements. The electrochemical properties of LC1, LC2 and LC3 were tested using a three-electrode system. The results showed that LC2 had the highest specific capacitance of 222.2 F/g at 0.2 A/g current density, and the specific capacitance of LC2 reached 149 F/g at higher current density of 20 A/g. Further study on its practical application in supercapacitors, the results showed that LC2 assembled symmetric supercapacitor had the largest specific capacitance per electrode and the highest capacitance retention(70.2%). At 1 A/g current density, the LC2 supercapacitor showed good rate performance and electrochemical stability after 5 000 charge-discharge cycles. Moreover, a series battery composed of symmetric LC2 supercapacitor could directly light the LED lamp.

Key words: lignin, porous carbon, structural characterization, electrochemical performance

CLC Number: