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Ultrathin MXene-based films exhibit superiorconductivity and high capacitance, showing promise as electro-des for flexible supercapacitors. This work describes a simplemethod to enhance the performance of MXene-based super-capacitors by expanding and stabilizing the interlayer spacebetween MXene flakes while controlling the functional groups toimprove the conductivity. Ti3C2Tx MXene flakes are treatedwith bacterial cellulose (BC) and NaOH to form a compositeMXene/BC (A-M/BC) electrode with a microporous interlayerand high surface area (62.47 m2 g−1). Annealing the films at lowtemperature partially carbonizes BC, increasing the overallelectrical conductivity of the films. Improvement in conductivity is also attributed to the reduction of −F, −Cl, and −OHfunctional groups, leaving −Na and −O functional groups on the surface. As a result, the A-M/BC electrode demonstrates acapacitance of 594 F g−1 at a current density of 1 A g−1 in 3 M H2SO4, which represents a ∼2× increase over similarlyprocessed films without BC (309 F g−1) or pure MXene (298 F g−1). The corresponding device has an energy density of 9.63Wh kg−1 at a power density of 250 W kg−1. BC is inexpensive and enhances the overall performance of MXene-based filmelectrodes in electronic devices. This method underscores the importance of functional group regulation in enhancing MXene-based materials for energy storage.

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  This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in ACS Nano, copyright © 2024 American Chemical Society after peer review. To access the final edited and published work see https://doi.org/10.1021/acsnano.3c11547

Keyword: MXene, bacterial cellulose, functional group modulation, composite film, supercapacitor

Date published: 2024-05-07

Publisher: American Chemical Society (ACS)

Journal:

• ACS Nano (ISSN: 1936086X) vol. 18 issue. 18 p. 11675-11687

Funding:

• Japan Society for the Promotion of Science 20K05453
• Japan Science and Technology Agency JPMJER2003
• Education Department of Shaanxi Province 23JK0539
• China Scholarship Council CSC202206280101
• National Natural Science Foundation of China 52302366
• Natural Science Foundation of Shandong Province ZR2020KF001
• Shaanxi Province 2020KWZ-004

Manuscript type: Author's version (Submitted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4732

First published URL: https://doi.org/10.1021/acsnano.3c11547

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Updated at: 2024-09-10 12:30:23 +0900

Published on MDR: 2024-09-10 12:30:23 +0900