1. Ti3C2Tx MXene integrated hollow carbon nanofibers with polypyrrole layers for MOF-derived freestanding electrodes of flexible asymmetric supercapacitors.
- Author
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Pathak, Ishwor, Acharya, Debendra, Chhetri, Kisan, Chandra Lohani, Prakash, Hoon Ko, Tae, Muthurasu, Alagan, Subedi, Subhangi, Kim, Taewoo, Saidin, Syafiqah, Dahal, Bipeen, and Yong Kim, Hak
- Subjects
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CARBON nanofibers , *SUPERCAPACITOR electrodes , *POLYPYRROLE , *NEGATIVE electrode , *ENERGY density , *SUPERCAPACITORS , *ELECTRODES - Abstract
[Display omitted] • Ti 3 C 2 T x MXene integrated hollow carbon nanofiber coated with outside inside polypyrrole layers (PPy@MXHCNF) is designed. • ZnCoMOF grown over PPy@MXHCNF is used to develop freestanding cathode (ZCO@PPy@MXHCNF) and anode (NPC@MXHCNF) materials. • ZCO@PPy@MXHCNF and NPC@MXHCNF exhibit specific capacitance of 1567.5 F g−1 and 477.21F g−1, respectively. • The assembled flexible ASC device delivers an energy density of 61.3 Wh kg−1 at 796.8 W kg−1. Effective customization of Ti 3 C 2 T x MXenes by electrospinning technique is crucial for the preparation of freestanding/flexible electrodes exhibiting enhanced performance in supercapacitors. Herein, we prepared MXenes containing hollow carbon nanofibers (MXHCNF) by co-axial electrospinning, and the inside-out of MXHCNF is decorated with polypyrrole layers (PPy@MXHCNF), which is sufficiently flexible, conductive, and highly functionalized with a unique trilayer morphology. Using the self-designed electroactive PPy@MXHCNF, a ZnCoMOF is homogeneously grown. The as-prepared bimetallic MOF on PPy@MXHCNF is used as a common precursor with which to fabricate the positive (ZCO@PPy@MXHCNF) and negative (NPC@MXHCNF) electrodes by a controlled heat treatment process using a "two from one" strategy. The freestanding positive and negative electrodes provide specific capacitances of 1567.5 F g−1 and 477.2 F g−1 at 1 A g−1, respectively, with high capacitance retention, cyclic stability, and coulombic efficiency. A flexible asymmetric device (ZCO@PPy@MXHCNF//NPC@MXHCNF) is assembled, and it exhibits an energy density of 61.3 Wh kg−1 at a power density of 796.8 W kg−1 and 92.8% capacitance retention after 10,000 GCD cycles. This work provides a unique approach involving MXene modification, polypyrrole decorated electrospun MXHCNFs as efficient substrates for freestanding electrodes, and the use of bimetallic MOF as a common strategic route for both positive and negative electrodes in flexible asymmetric supercapacitors. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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