超级电容器
木质素
深共晶溶剂
电解质
电容
复合数
材料科学
功率密度
化学工程
共晶体系
聚合物
碳纤维
电极
复合材料
有机化学
化学
微观结构
物理化学
功率(物理)
工程类
物理
量子力学
作者
Jinxu Huang,Yuanyuan Hu,Hao Wang,Tiansheng Wang,Hao Bin Wu,Jianzhu Li,Yujie Li,Mi Wang,Jiaheng Zhang
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2022-05-04
卷期号:5 (5): 6393-6400
被引量:23
标识
DOI:10.1021/acsaem.2c00835
摘要
The current challenge for supercapacitors based on sustainable materials is the difficulty of elevating energy density while maintaining the power density and capacitance retention. Herein, we demonstrate a strategy to boost the energy density of renewable all-lignin-based supercapacitors via sound design of lignin porous carbon electrodes isolated from poplar wood as well as employing lignin/deep eutectic solvent (DES) gel polymer electrolytes (GPEs) with a wide electrochemical window. The resulting device exhibits a remarkable specific capacitance of 181.5 F g–1 at 1 A g–1 and favorable capacitance retention of 80.2% at 5 A g–1 over 2000 cycles, which is attributed to the large specific surface area of 1125 m2 g–1 as well as a high degree of graphitization possessed by the electrode materials and excellent conductivity of 13.5 S/m held by the DES gel polymer electrolytes. Furthermore, the supercapacitor delivers a maximum energy density of 40.8 Wh kg–1 and it remains 29.0 Wh kg–1 at an ultrahigh power density of 3.2 KW kg–1.
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