Preprint Article Version 1 This version is not peer-reviewed

Effect of Time on a Hierarchical Corn Skeleton-Like Composite of [email protected] as Capability Electrode Material for High Specific Performance Supercapacitors

Version 1 : Received: 26 October 2018 / Approved: 26 October 2018 / Online: 26 October 2018 (11:07:54 CEST)

A peer-reviewed article of this Preprint also exists.

Kumar, Y.A.; Kim, H.-J. Effect of Time on a Hierarchical Corn Skeleton-Like Composite of [email protected] as Capacitive Electrode Material for High Specific Performance Supercapacitors. Energies 2018, 11, 3285. Kumar, Y.A.; Kim, H.-J. Effect of Time on a Hierarchical Corn Skeleton-Like Composite of [email protected] as Capacitive Electrode Material for High Specific Performance Supercapacitors. Energies 2018, 11, 3285.

Journal reference: Energies 2018, 11, 3285
DOI: 10.3390/en11123285

Abstract

CoO-ZnO-based composites have attracted considerable attention for the development of energy storage devices because of their multifunctional characterization and ease of integration with existing components. This paper reports the synthesis of [email protected] (CZ) nanostructures on Ni foam by the CBD method for facile and eco-friendly supercapacitor applications. The formation of a [email protected] electrode functioned with cobalt, zinc, nickel and oxygen groups was confirmed by X-ray diffraction, X-ray photoelectron spectroscopy, low and high-resolution of scanning electron microscopy, and transmission electron microscopy. The as-synthesized hierarchical nanocorn skeleton-like structure of [email protected] (CZ3h) electrode delivered a higher specific capacitance of 1136 F/g at a current density of 3 A/g with outstanding cycling stability, showing 98.3% capacitance retention over 3000 cycles in an aqueous 2 M KOH electrolyte solution. This retention was significantly better than that of other prepared electrodes, such as CoO (CO), ZnO (ZO), [email protected] (CZ1h), and [email protected] (CZ7h) (274, 383, 240 and 537 F/g, respectively). This superior capacitance was attributed to the ideal surface morphology of CZ3h, which is responsible for the rapid electron/ion transfer between the electrolyte and electrode surface area. The enhanced features of the CZ3h electrode highlight potential applications in high performance supercapacitors, solar cells, photocatalysis, and electrocatalysis.

Subject Areas

nanorod structure; nanocorn structure; Hierarchical nanocorn skeleton-like structure; energy storage devices

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