Abstract
Although the graphene-carbon nanotube(G-CNT) hybrid has attracted much attention in energy storage research, it has the limitation of low volumetric capacitance due to its agglomerated structure. So, optimizing its structural parameter is the key to achieving high performance. Herein, described the preparation and characterization of vertically aligned single-walled carbon nanotube-reduced graphene oxide (VCNT-RGO) hybrid and the effect of structural alignment on the electrochemical performance. The structural morphology of the hybrids was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy. The influence of the alignment of the hybrid on electrochemical performance was investigated using cyclic voltammetry and charge–discharge curves. Consequently, the hybrid with vertically aligned structure VCNT-RGO delivers an areal capacitance of 204.9 F/g at a scan rate of 5 mV/s and specific capacitance of 117.1 F/g at 1 A/g current density with a high energy density of 25.4 Wh/kg and a power density 625 W/kg which is 1.6 times higher than that of unorganized hybrid CNT-RGO of 112.8 F/g areal capacitance at a scan rate of 5 mV/s and 72.5 F/g specific capacitance at 1 A/g current density, in 1 M KOH aqueous solution. Moreover, the VCNT-RGO hybrid shows good stability after 2000 long cycles at a current density of 5 A/g with capacitance retention of 84%. These results suggest that the vertically aligned hierarchical network improved charge transport efficiency by providing more surface area for interaction. This work paves a feasible pathway to prepare 3D carbon nanohybrid architecture for high performance in energy storage.
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All authors contributed to the study’s conception and design. Material preparation, data collection, and analysis were performed by PP and GG. The manuscript was written by PP. The work was framed and supervised by RS and SA. All authors read and approved the final manuscript.
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Pachiannan, P., Gopinath, G., Swaminathan, R. et al. Effect of structural alignment on the electrochemical performance of reduced graphene oxide-single-walled carbon nanotube hybrid for supercapacitor application. J Mater Sci: Mater Electron 34, 2198 (2023). https://doi.org/10.1007/s10854-023-11639-5
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DOI: https://doi.org/10.1007/s10854-023-11639-5