首页|MnO2 nanosheets synthesized on nitrogen-doped vertically aligned carbon nanotubes as a supercapacitor electrode material
MnO2 nanosheets synthesized on nitrogen-doped vertically aligned carbon nanotubes as a supercapacitor electrode material
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NSTL
Elsevier
? 2022 Elsevier B.V.In the present study, nitrogen-doped vertically aligned carbon nanotubes (N-VACNTs) were synthesized on carbon cloth (CC) using the floating catalyst chemical vapor deposition (FCCVD) method, and MnO2 nanosheets were grown on them using the hydrothermal method to produce an N-VACNT@MnO2 nanocomposite structure. In this structure, a synergistic effect was obtained by combining N-VACNTs, which allow high electrical conductivity and fast ion transfer. In the galvanostatic charge-discharge (GCD) measurements performed separately in a three-electrode test cell using 1 M of Na2SO4 electrolyte, the specific capacitance of the N-VACNTs was found to be 53.7 F g?1 at a current density of 0.5 A g?1, and the specific capacitance of the N-VACNT@MnO2 electrode structure was found to be 497 F g?1. In addition, after 10,000 charge-discharge cycles at a current density of 10 A g?1, the N-VACNT electrode retained 99 % of its initial specific capacitance, while the N-VACNT@MnO2 electrode exhibited outstanding cyclic stability with 76 % of its initial specific capacitance. Moreover, in the as-fabricated asymmetric supercapacitor (ASC) using N-VACNTs and N-VACNTs@MnO2, the negative and positive electrodes achieved a stable voltage window of 0–1.7 V, with a specific capacitance of 59.4 F g?1 at a current density of 1 A g?1. Additionally, this ASC showed good cycling stability retaining 84 % of its specific capacitance at the end of 10,000 cycles. Therefore, this ASC structure with an energy density of 24.7 Wh kg?1 and a power density of 15.7 kW kg?1 are promising electrode materials for energy storage.
Carbon cloth (CC)Floating catalyst chemical vapor deposition (FCCVD)MnO2N-VACNT
Yesilbag Y.O.、Tuzluca Yesilbag F.N.、Huseyin A.、Salih A.J.S.、Ertugrul M.
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Department of Physics Erzincan Binali Y?ld?r?m University
Department of Pyhsics Erzincan Binali Y?ld?r?m University Graduate School of Natural and Applied Sciences
Department of Electrical and Electronics Engineering Atatürk University
NSTL
Elsevier
