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oai:ebyu-rdlopen.rawdatalibrary.net:ebyu/120172026-10-18T20:39:11Zopenairedrivercom_ebyu_10000col_ebyu_10001

MnO2 nanosheets synthesized on nitrogen-doped vertically aligned carbon nanotubes as a supercapacitor electrode materialYesilbag, Yasar OzkanTuzluca Yesilbag, Fatma NurHuseyin, AhmadSalih, Ahmed Jalal SalihErtugrul, MehmetCarbon cloth (CC)Floating catalyst chemical vapor deposition (FCCVD)MnO₂N-VACNTCapacitanceCarbon nanotubesCatalystsCurrent densityDoping (additives)Electric dischargesElectrodesElectrolytesManganese oxideNanosheetsNitrogenSodium sulfateSulfur compoundsSupercapacitorAsymmetric supercapacitorCarbon clothCarbon clothsChemical vapour depositionFloating catalystFloating catalyst chemical vapor depositionNitrogen-dopedNitrogen-doped vertically aligned carbon nanotubeSpecific capacitanceVertically aligned carbon nanotubeChemical vapor depositionIn 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. © 2022 Elsevier B.V.Elsevier Ltd2022Articlehttps://rdlopen.rawdatalibrary.net/r/ebyu/12017https://doi.org/10.1016/j.jallcom.2022.1665700925-8388enJournal of Alloys and Compoundsinfo:eu-repo/semantics/openAccessinfo:eu-repo/semantics/articlehttps://ebyu-rdlopen.rawdatalibrary.net/tr/items/ebyu/12017