Chemical Industry and Engineering Progress ›› 2021, Vol. 40 ›› Issue (8): 4381-4387.DOI: 10.16085/j.issn.1000-6613.2020-1994

• Materials science and technology • Previous Articles     Next Articles

Preparation and properties of chestnut shell-based biochar electrode material for high-performance symmetrical supercapacitor

WANG Fangping(), MA Jing, LI Xiaoya, QIAO Yan, ZHOU Kailing   

  1. Key Laboratory of Bioelectrochemistry & Environmental Analysis of Gansu;Key Laboratory of Eco-Environment-Related Polymer Materials,Ministry of Education of China;College of Chemistry and Chemical Engineering,Northwest Normal University, Lanzhou 730070, Gansu, China
  • Received:2020-09-29 Online:2021-08-12 Published:2021-08-05
  • Contact: WANG Fangping

板栗壳生物炭高性能对称性超级电容器电极材料的制备及性能

王芳平(), 马婧, 李小亚, 乔艳, 周凯玲   

  1. 甘肃省生物电化学与环境分析重点实验室,省部共建生态环境相关高分子材料教育部重点实验室,西北师范 大学化学化工学院,甘肃 兰州 730070
  • 通讯作者: 王芳平
  • 作者简介:王芳平(1973—),女,博士,副教授,研究方向为电化学相关能源材料。E-mail:wangfp@nwnu.edu.cn
  • 基金资助:
    国家自然科学基金(21065010)

Abstract:

High performance supercapacitor electrode material (CC 700-Zn) was successfully prepared by using chestnut shell as carbon source (CC) and ZnCl2 activation after carbonization of CC at 700℃. The morphology and performance of CC700-Zn electrode materials were tested. It was found that CC700-Zn had a 3D channel network structure with a specific surface area of 813.9m2/g, and the network structure formed by mesopores and micropores provided a channel for electronic transmission. In a three-electrode system, CC700-Zn showed a high specific capacitance of 506F/g at a current density of 1A/g and outstanding cycling stability of 91% capacitance retention after 10000 cycles. In a two-electrode system, a symmetrical capacitor was assembled with CC700-Zn. The symmetric capacitor had a specific capacitance of 118F/g at 1A/g, the scan rate of CV can be increased to 220mV/s, and the potential window width was 0~1.6V. When the power density was 900W/kg, the energy density was 53.1W·h/kg. When the power density was increased to 27000W/kg, the energy density can still be maintained at 27W·h/kg. The above results indicated that it was feasible to prepare symmetrical supercapacitor electrode materials using chestnut shell as carbon source.

Key words: chestnut shell, supercapacitor, porous carbon, biomass

摘要:

以板栗壳为碳源(CC),经700℃炭化(CC700)后采用ZnCl2活化,成功制备了高性能的超级电容器电极材料(CC700-Zn)。对电极材料的形貌和性能进行测试,发现CC700-Zn具有3D孔道网络结构,比表面积达813.9m2/g,这种具有高比表面积的孔道结构为电子传输提供了通道。三电极体系中,1A/g时比电容可达506F/g,经过10000圈的循环之后其比电容仍能保持初始值的91%;二电极体系中,用CC700-Zn组装的对称性电容器在1A/g下的比电容为118F/g,CV的扫描速率可增大至220mV/s,电势窗宽0~6V。功率密度为900W/kg时,能量密度为53.1W·h/kg,当功率密度增加至27000W/kg时,能量密度仍可保持27W·h/kg。表明用板栗壳作为碳源制备对称性超级电容器电极材料是可行的。

关键词: 板栗壳, 超级电容器, 多孔碳, 生物质

CLC Number: 

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