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Intercalation and Delamination Behavior of Ti3C2Tx and MnO2/Ti3C2Tx/RGO Flexible Fiber with High Volumetric Capacitance

Abstract

The intercalation and delamination process of Ti3C2Tx are systematically investigated by using alkylammonium hydroxides (TAAOH) with different chain lengths. TAA+ cations have a key function for the intercalation reaction of Ti3C2Tx nanosheets, and the basal spacing and the crystal phase of TAA+-intercalated Ti3C2Tx at different stages is closely related to the size of the intercalated TAA+ ions, it is hardly changed with the adding molar equivalents of TAAOH per mole of Ti3C2Tx and the drying condition. Moreover, the intercalation process is very rapid and it can be carried out by only 4 h treating. TAA+-intercalated Ti3C2Tx can be delaminated into Ti3C2Tx nanosheets by hand shaking or repeated washing. By introducing graphene oxide nanosheets suspension into Ti3C2Tx nanosheets suspension, Ti3C2Tx/RGO fibers are firstly prepared by a wet-spinning method and followed by reducing Ti3C2Tx/GO fibers in HI/CH3COOH solution. Then Ti3C2Tx/RGO fiber is soaked in KMnO4 solution with different concentrations at room temperature, MnO2/Ti3C2Tx/RGO ternary hybrid fiber with good flexibility and capacitance is prepared. MnO2/Ti3C2Tx/RGO ternary hybrid fiber electrode shows the largest volumetric capacitance of 851 F cm3 in 1 M Na2SO4 electrolyte and good flexibility. By twisting two this fiber electrodes together, all-solid-state symmetric MnO2/Ti3C2Tx/RGO//MnO2/Ti3C2Tx/RGO fiber supercapacitor with PVA-LiCl gel electrolyte is assembled. It not only exhibits a volumetric capacitance of 24 F cm3 and superior cycle stability of 92 % after 10000 cycles, but also shows outstanding flexibility and mechanical property in which the volumetric capacitance has no obvious change after bending the supercapacitor at 90 ° for 1000 times. Futhermore, the assembled symmetric supercapacitor shows maximum volumetric energy density of 2.13 mW h cm3 at a volumetric power density of 8.16 mW cm3. This work will open new application filed of Ti3C2Tx-based fibers for new wearable energy storage devices with good energy density and flexibility.

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Publication details

The article was received on 22 Feb 2019, accepted on 08 Apr 2019 and first published on 08 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA01993F
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Intercalation and Delamination Behavior of Ti3C2Tx and MnO2/Ti3C2Tx/RGO Flexible Fiber with High Volumetric Capacitance

    M. Lu, Z. Zhang, L. Kang, X. He, Q. Li, J. Sun, R. Jiang, H. Xu, F. Shi, Z. Lei and Z. Liu, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA01993F

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