Electrochemical Performance of Core-Sheath Dip-Coated Lignin Derived Carbon/Wet-Spun Graphene Electrodes for Fiber-Shaped Supercapacitors

• 作者: HU Wenxin LIU Yan XIANG Ruifang JING Yuanyuan XU Qingli ZHANG Juan HU Xuefeng JIN Yanhong YANG Xiaona CHENG Yu LIN Jiaxian ZHANG Kun LU Chunhong
• 来源期刊: 东华大学学报（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: Flexible Electronics
• 页码范围: 91-98
• 页数: 8页
• 分类号: TS151
• 语种: 英文
• DOI: 10.19884/j.1672-5220.202012115

摘要

One-dimensional graphene fibers ( GFs ) possess excellent properties, including high electrical conductivity, good physical and chemical stability, high thermal conductivity, flexibility, etc. GFs are ideal electrode materials for fiber-shaped supercapacitors. However, due to the lack of an effective method to manufacture GFs with high specific capacitance, their low energy density hinders their practical application. Herein, we decorated wet-spun graphene oxide fibers ( GOFs ) by dip-coating them with graphene oxide ( GO) solutions containing different contents of lignin to obtain a core-sheath lignin/GO composite fibers. After carbonization and activation, we successfully prepared lignin derived carbon/GF electrodes. The assembled fiber-shaped supercapacitors ( FSSCs ) exhibit a specific capacitance of 9. 98 mF/cm2 and an energy density of 0.89 μW·h/cm2 , about 6 times of those of pure GFs (1.57 mF/cm2 and 0.14 μW·h/cm2, respectively), long cycling life and cycling stability. This suggests that the introduction of lignin derived carbon into GFs can effectively increase the specific capacitance and the energy density of FSSCs.