High-performance MnO.sub.2@MXene/carbon nanotube fiber electrodes with internal and external construction for supercapacitors

• Published in: Journal of materials science Vol. 57; no. 5; p. 3613
• Main Authors: Guo, Zijiao, Li, Yue, Lu, Zan, Chao, Yunfeng, Liu, Wei
• Format: Journal Article
• Language: English
• Published: Springer 01.02.2022
• Subjects: Capacitors; Electric properties; Electrolytes; Nanotubes; Textile industry
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-021-06840-y

As interest in smart textiles grows, fiber-based supercapacitors are gaining attention as promising devices for powering wearable electronics. Herein, we have demonstrated a two-step manufactured hybrid fiber with excellent energy storage properties. Anhydrous MXene (Ti.sub.3C.sub.2T.sub.x) sheets are primarily spun in synergy with liquid crystal carbon nanotubes (CNTs) to produce a continuous fiber as a promising electrode material, which solves the problem of poor rate capability owing to the sheet re-stacking of MXene. MnO.sub.2@MXene/CNT fibers are subsequently prepared by electrochemical deposition with controlled time. The optimal content of MXene (10 wt%) and a perfect thickness of the MnO.sub.2 layer (4 [mu]m) are testified to achieve an excellent capacitance of 371.1 F cm.sup.-3 in three-electrode system, which is about 200% and 1800% higher than that of 10 wt%-MXene/CNT and CNT fiber electrode, respectively. Symmetric fiber supercapacitor is assembled by paralleling two fibers with LiCl/PVA gel electrolyte, manifesting a superior cycling stability of 86.3% after 10000 cycles. Graphical Anhydrous MXene nanosheets and CNTs are incorporated by a high yield spinning technique to prepare continuous hybrid fibers as a conductive framework for MnO2 deposition, exhibiting stable and outstanding energy storage properties in supercapacitor.