TiCT MXene embedded metal-organic framework-based porous electrospun carbon nanofibers as a freestanding electrode for supercapacitors

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Vol. 11; no. 1; pp. 51 - 514
• Main Authors: Pathak, Ishwor, Acharya, Debendra, Chhetri, Kisan, Chandra Lohani, Prakash, Subedi, Subhangi, Muthurasu, Alagan, Kim, Taewoo, Ko, Tae Hoon, Dahal, Bipeen, Kim, Hak Yong
• Format: Journal Article
• Published: 07.03.2023
• ISSN: 2050-7488; 2050-7496
• DOI: 10.1039/d2ta09726e

Rational modification of Ti 3 C 2 T x MXenes for the preparation of freestanding and flexible carbon-based electrodes with great prospects for an energy storage facility is a crucial task for new-generation supercapacitors. Herein, a novel Ti 3 C 2 T x MXene-decorated porous carbon nanofiber (PCNF) freestanding/flexible electrode is engineered through a sequential approach of electrospinning, in situ growth of ZIF67, and a carbonization process. By varying the concentration of MXenes in the fiber, the electrochemical performance of a set of MXene-integrated PCNFs is investigated, and flexible symmetric and asymmetric supercapacitor devices are assembled. The optimized MX-5@PCNF achieves a specific capacitance of 572.7 F g −1 at 1 A g −1 with high cycling stability (96.4% capacitance retention after 10 000 cycles) and superior rate capability (71.24% at 30 A g −1 ). Furthermore, MX-5@PCNF-based flexible symmetric and asymmetric (Co 3 O 4 @NF//MX-5@PCNF) devices furnish high energy densities of 22.53 W h kg −1 and 74.2 W h kg −1 , respectively, along with a long life cycle, ideal coulombic efficiency, and rate capability, demonstrating their practical applicability. This study provides an alternative strategy to prepare MXene-decorated PCNF freestanding electrodes with high performance, and the technique can be extended to other 2D MXenes for designing efficient electrodes for flexible supercapacitors. Ti 3 C 2 T x MXene-integrated porous carbon nanofiber freestanding/flexible electrodes are engineered and the optimized MX-5@PCNF is used for the fabrication of flexible symmetric and asymmetric supercapacitor devices with high energy density.