Journal
ELECTROCHIMICA ACTA
Volume 318, Issue -, Pages 820-827Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.06.045
Keywords
Ti3C2Tx-MXene; Polypyrrole; Electrochemical codeposition; Three-dimensional carambola-like structures; Supercapacitor electrode
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Funding
- PhD research startup foundation of Yan'an University [YDBK2017-28]
- College Students' innovation and Entrepreneurship Project of Shaanxi [201820053]
- University-level scientific research project of Yan'an University [YDQ2018-16]
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Two-dimensional (2D) MXenes have been extensively investigated for electrochemical energy storage because of their excellent electronic properties. In this work, a facile and effective method was developed to fabricate MXene/polypyrrole (MXene/PPy) composite film electrodes via one-step co-electrodeposition. In this process, 2D Ti3C2Tx-MXene nanosheets acted as a core polymer because of the functional groups, such as -F, -OH, or -O, on their surface, and pyrrole monomer radical cations (Py center dot(+)) would gradually polymerize on the surface and layer space of the 2D MXene nanosheets to form three-dimensional (3D) carambola-like MXene/PPy composite films. The 3D structure composite facilitated electron transfer and ionic diffusion, so the MXene/PPy composite film electrodes exhibited an outstanding electrochemical performance with a high gravimetric capacitance of 416 F g(-1) at a current density of 0.5 A g(-1) in a three-electrode system. The as-fabricated symmetric supercapacitors of ITO-glasses coated with MXene/PPy composite films also exhibited a high specific capacitance (184 F g(-1) at a scan rate of 10 mV s(-1)), excellent reliability and good cycling stability (approximately 86.4% retention after 5000 cycles, at 5 A g(-1)). (C) 2019 Elsevier Ltd. All rights reserved.
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