We developed a novel fiber-shaped supercapacitor based on a hybrid MXene@CNT//N-doped CNT device. In particular, for the first time, electrophoretically deposited Ti3C2Tx MXenes on carbon nanotube yarns and microwave-assisted nitrogen-doped carbon nanotube yarns are proposed as negative and positive electrodes, respectively. Short-circuit encountered during cell assembly was prevented entirely by coating a reproducible polyvinylidene difluoride (PVDF) membrane directly on the electrodes. Based on the developed electrodes, the assembled cell exhibited a large operating voltage window of up to 2.0 V in a diluted 0.5 M H2SO4 liquid electrolyte. The device displayed excellent stability over 5000 cycles with a Coulombic efficiency of nearly 100 %. The device withstood a floating test for 70 h with approximately 100 % capacity retention and exhibited excellent resistance to mechanical stress. Areal energy density as high as 298.5 mu Wh cm-2 was recorded for a power density value of 855.5 mu W.cm- 2 at an areal current value of 0.5 mA cm-2. At a high current density of 10 mA cm-2, the energy density remained high at 99.0 mu Wh cm-2 for a corresponding power density of 8.11 mW cm-2. The reported values rank among the highest obtained for carbon nanotubes-based wired-shaped super -capacitors and show the potential of this flexible wired-shaped hybrid energy storage unit as a wearable device.

High-performance novel asymmetric MXene@CNT//N-doped CNT flexible hybrid device with large working voltage for energy storage / Dangbegnon, J.; Garino, N.; Angelozzi, M.; Laurenti, M.; Seller, F.; Serrapede, M.; Zaccagnini, P.; Moras, P.; Cocuzza, M.; Ouisse, T.; Pazniak, H.; Gonzalez-Julian, J.; Sheverdyaeva, P. M.; Di Vito, A.; Pedico, A.; Pirri, C. F.; Lamberti, A.. - In: JOURNAL OF ENERGY STORAGE. - ISSN 2352-152X. - 63:106975(2023), pp. 1-11. [10.1016/j.est.2023.106975]

High-performance novel asymmetric MXene@CNT//N-doped CNT flexible hybrid device with large working voltage for energy storage

Cocuzza M.;Pedico A.;Pirri C. F.;
2023

Abstract

We developed a novel fiber-shaped supercapacitor based on a hybrid MXene@CNT//N-doped CNT device. In particular, for the first time, electrophoretically deposited Ti3C2Tx MXenes on carbon nanotube yarns and microwave-assisted nitrogen-doped carbon nanotube yarns are proposed as negative and positive electrodes, respectively. Short-circuit encountered during cell assembly was prevented entirely by coating a reproducible polyvinylidene difluoride (PVDF) membrane directly on the electrodes. Based on the developed electrodes, the assembled cell exhibited a large operating voltage window of up to 2.0 V in a diluted 0.5 M H2SO4 liquid electrolyte. The device displayed excellent stability over 5000 cycles with a Coulombic efficiency of nearly 100 %. The device withstood a floating test for 70 h with approximately 100 % capacity retention and exhibited excellent resistance to mechanical stress. Areal energy density as high as 298.5 mu Wh cm-2 was recorded for a power density value of 855.5 mu W.cm- 2 at an areal current value of 0.5 mA cm-2. At a high current density of 10 mA cm-2, the energy density remained high at 99.0 mu Wh cm-2 for a corresponding power density of 8.11 mW cm-2. The reported values rank among the highest obtained for carbon nanotubes-based wired-shaped super -capacitors and show the potential of this flexible wired-shaped hybrid energy storage unit as a wearable device.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/77482
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