Three-dimensional carambola-like MXene/polypyrrole composite produced by one-step co-electrodeposition method for electrochemical energy storage
| Autor: | Rui Li, Mi-mi Zhang, Zhenhai Liang, Feng Fu, Xuan Jian, Min He, Lu Chen, Lou-jun Gao |
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| Rok vydání: | 2019 |
| Předmět: |
Supercapacitor
chemistry.chemical_classification Horizontal scan rate Materials science General Chemical Engineering Composite number 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology Polypyrrole Electrochemistry 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Chemical engineering Electrode 0210 nano-technology MXenes |
| Zdroj: | Electrochimica Acta. 318:820-827 |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2019.06.045 |
| Popis: | 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·+) 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). |
| Databáze: | OpenAIRE |
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