当前位置: X-MOL 学术Ind. Crops Prod. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Effect of lignin structure in different biomass resources on the performance of lignin-based carbon nanofibers as supercapacitor electrode
Industrial Crops and Products ( IF 5.9 ) Pub Date : 2021-06-18 , DOI: 10.1016/j.indcrop.2021.113745
Boyu Du , Hongwei Zhu , Lanfang Chai , Jinlan Cheng , Xing Wang , Xiaohong Chen , Jinghui Zhou , Run-Cang Sun

Lignin is proposed to an attractive stuff for fabricating functional composite nano-carbon materials owing to its high carbon yield and low-cost. In this work, in order to unlocking the mechanism of the plant species of lignin on electrochemical energy storage capacity of lignin-based carbon nanofibers (LCNFs), three typical lignin from representative hardwood (poplar, PR), softwood (pine, PE) and grass (corn stalk, CS) materials, and containing different structural units (syringyl units (S), guaiacyl units (G), and/or p-hydroxyphenyl unit (H)) were chosen to prepare LCNFs with polyacrylonitrile (PAN) as blending agent. As compared with other LCNFs, poplar lignin (PRL) based LCNFs-PRL (5:5) with independent filamentous morphology networks exhibited higher tensile strength of 35.32 MPa, greater specific surface area of 1062.5 m2/g and larger specific capacitance of 349.2 F/g. Moreover, in a two electrode system, the assembled LCNFs-PRL (5:5)//LCNFs-PRL (5:5) symmetric supercapacitor also displayed an excellent energy density of 39.6 Wh/kg at the power density of 5000 W/kg and outstanding cycling stability of 90.52 % after 5000 cycles in Na2SO4 aqueous electrolyte. The results proved that hardwood lignin was a good green raw material for LCNFs. The mechanism of lignin chemical structure on the properties was demonstrated in detail by various characterization analysis, such as electrochemical test, nuclear magnetic resonance spectroscopy (NMR) and gel permeation chromatography (GPC), which indicated that the structural units, molecular weight, homogeneity, hydrophilic and hydrophobic groups of lignin were more important for fabricating high quality LCNFs.



中文翻译:

不同生物质资源中木质素结构对木质素基碳纳米纤维作为超级电容器电极性能的影响

木质素因其高碳产率和低成本而被认为是制造功能性复合纳米碳材料的一种有吸引力的材料。在这项工作中,为了解开木质素植物物种对木质素基碳纳米纤维(LCNFs)电化学储能能力的作用机制,来自代表性硬木(杨树、PR)、软木(松树、PE)和草(玉米杆、CS)材料,并含有不同的结构单元(丁香基单元 (S)、愈创木基单元 (G) 和/或p选择-羟基苯基单元 (H)) 以聚丙烯腈 (PAN) 作为共混剂制备 LCNF。与其他 LCNFs 相比,具有独立丝状形态网络的杨木木质素 (PRL) LCNFs-PRL (5:5) 表现出更高的拉伸强度 35.32 MPa,更大的比表面积 1062.5 m 2 /g 和更大的比电容 349.2 F /G。此外,在双电极系统中,组装的 LCNFs-PRL (5:5)//LCNFs-PRL (5:5) 对称超级电容器在 5000 W/kg 的功率密度下也显示出 39.6 Wh/kg 的优异能量密度在 Na 2 SO 4 中循环 5000 次后具有 90.52 % 的出色循环稳定性水性电解质。结果证明,阔叶木木质素是一种很好的LCNFs绿色原料。通过电化学测试、核磁共振波谱(NMR)和凝胶渗透色谱(GPC)等多种表征分析,详细论证了木质素化学结构对性能的影响机理,表明结构单元、分子量、均一性、木质素的亲水和疏水基团对于制造高质量的 LCNF 更为重要。

更新日期:2021-06-18
down
wechat
bug