酶解木质素炭的制备及其电化学性能研究

doi:10.3969/j.issn.0253-2417.2022.02.007

摘要/Abstract

摘要：

以纯化的酶解木质素为碳源，通N₂条件下高温炭化1、2和3 h制备了酶解木质素炭LC₁、LC₂、LC₃。采用SEM、TEM和氮气吸附/脱附等温线对炭材料进行分析，结果表明：LC₁、LC₂、LC₃的表面具有微孔、介孔和大孔结构，其比表面积分别为894.75、1 376.74和776.47 m²/g，孔容分别为0.41、0.70和0.40 cm³/g。XRD和拉曼光谱分析表明，随着炭化时间的延长，酶解木质素炭的有序性逐渐增强。通过XPS分析表明酶解木质素炭主要含有C、O和少量N元素。采用三电极体系，对LC₁、LC₂、LC₃的电化学性能进行测试，结果表明：LC₂的比电容最大，在0.2 A/g电流密度下的比电容为222.2 F/g，在高电流密度20 A/g时LC₂的比电容可达到149 F/g。进一步研究了LC₂在超级电容器中的实际应用，结果表明：组装的对称超级电容器的单电极比电容最大且电容保持率(70.2%)最高，在1 A/g电流密度下，LC₂超级电容器经5 000次充放电循环测试，均表现出良好的倍率性能和电化学稳定性，且使用对称LC₂超级电容器组成的串联电池可直接点亮LED灯。

关键词: 木质素, 多孔炭, 结构表征, 电化学性能

Abstract:

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

中图分类号:

TQ35
TQ150

胡婷婷, 佟淑慧, 卫家祺, 张磊, 赵佳宁. 酶解木质素炭的制备及其电化学性能研究[J]. 林产化学与工业, 2022, 42(2): 47-55.

Tingting HU, Shuhui TONG, Jiaqi WEI, Lei ZHANG, Jianing ZHAO. Preparation and Electrochemical Performance Analysis of Enzymatic Hydrolyzed Lignin Carbon[J]. Chemistry and Industry of Forest Products, 2022, 42(2): 47-55.

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样品 sample	炭化时间/h carbonization time	比表面积/(m²·g^-1) specific surface area	微孔比表面积/(m²·g^-1) specific surface area of micropores	介孔比表面积/(m²·g^-1) specific surface area of mesopores	孔容/(cm³·g^-1) pore volume
LC₁	1	894.75	866.88	27.87	0.41
LC₂	2	1376.74	1321.10	55.64	0.70
LC₃	3	776.47	736.39	40.08	0.40

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