High-performance MnO2@MXene/carbon nanotube fiber electrodes with internal and external construction for supercapacitors

• Published in: Journal of materials science Vol. 57; no. 5; pp. 3613 - 3628
• Main Authors: Guo, Zijiao, Li, Yue, Lu, Zan, Chao, Yunfeng, Liu, Wei
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.02.2022; Springer Nature B.V
• Subjects: Carbon nanotubes; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Continuous fibers; Crystallography and Scattering Methods; Deposition; Electrode materials; Electrodes; Energy Materials; Energy storage; Liquid crystals; Manganese dioxide; Materials Science; MXenes; Polymer Sciences; Smart materials; Solid Mechanics; Supercapacitors; Textiles; Thickness
• 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 3 C 2 T 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 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 2 layer (4 μm) are testified to achieve an excellent capacitance of 371.1 F cm −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 Abstract 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.