超级电容器
材料科学
生物量(生态学)
tar(计算)
化学工程
水溶液
电解质
碳纤维
电容
比表面积
制浆造纸工业
多孔性
纳米技术
电极
复合材料
化学
有机化学
计算机科学
生态学
工程类
复合数
物理化学
生物
催化作用
程序设计语言
作者
Jing Wu,Mingwei Xia,Xiong Zhang,Yingquan Chen,Fei Sun,Xianhua Wang,Haiping Yang,Hanping Chen
标识
DOI:10.1016/j.jpowsour.2020.227982
摘要
Owing to intrinsic structural limitations, it is difficult to control the pore structure of biomass to synthesize hierarchical porous carbons (HPCs) to achieve high supercapacitor performance. As an inevitable by-product of the thermochemical conversion of biomass, wood tar exhibits good thermoplasticity and high-carbon content, and can be used as an alternative carbon source for biomass to prepare HPCs. To improve the utilization of wood tar, a facile synthetic route is proposed for preparing HPCs, based on a natural biological template method coupled with KOH activation. The HPCs possess favorable features in terms of high solid-carbon yield, high oxygen content (~9 at%), large specific surface areas (626.43–2489.62 m2 g−1), and an interconnected hierarchical porous structure, which greatly improved wettability and synergistically enable the construction of high-performance supercapacitors in aqueous and organic systems. The optimized HPC electrode exhibits a specific capacitance of 338.5 F g−1 in a 6 M KOH electrolyte, and the constructed symmetric supercapacitors deliver high energy densities up to 9.9 Wh kg−1 and 33.87 Wh kg−1 in aqueous and organic electrolytes, respectively. This study provides an effective route for the utilization of wood tar and crab shell waste.
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