Wet spun cellulose nanocrystal/MXene hybrid fiber regulated by bridging effect for high electrochemical performance supercapacitor

• Published in: Advanced composites and hybrid materials 2024-08, Vol.7 (4), Article 120
• Main Authors: Wang, Yaxuan, Xu, Ting, Qi, Junjie, Wang, Aoran, Liu, Kun, Zhang, Meng, Huan, Weiwei, Meng, Yu, Tong, Shuhua, Zheng, Chunyang, Xiang, Hengxue, Li, Jie, Si, Chuanling
• Format: Article
• Language: English
• Subjects: Ceramics; Chemistry and Materials Science; Composites; Glass; Materials Engineering; Materials Science; Natural Materials; Polymer Sciences
• ISSN: 2522-0128; 2522-0136
• DOI: 10.1007/s42114-024-00918-2

Cellulose nanocrystals (CNC) possess a large aspect ratio, high crystallinity, good mechanical performance, and environmental friendliness. It can be used as a frame and spacer of two-dimensional conductive materials, which reduces the stacking effect and is conducive to enhancing the mechanical and electrochemical properties of two-dimensional materials. In this study, CNC-regulated MXene fibers with high electrical conductivity (344.67 S cm −1 ) were prepared by wet spinning. There is a strong bridging effect between CNC molecules rich in -OH and MXene molecules. This makes them have good compatibility and is good to the preparation of uniform dispersion solution. The prepared hybrid fibers exhibit superior electrochemical performance. In three-electrode system, the volumetric capacitance of the hybrid fibers reaches up to 885.6 F cm −3 (0.38 A cm −3 ). The energy density of symmetric supercapacitors assembled from CNC/MXene hybrid fibers is 11.30 mWh cm −3 , and the power density is 11.40 mW cm −3 . Furthermore, after 9000 charge-discharge cycles, the capacitance maintains 93% of its initial capacity, demonstrating outstanding cycle stability. It is believed that this study can provide a simple and effective method for the preparation of portable and wearable energy storage devices.