Morphology-dependent charge storage performance of Co3O4 nanostructures in an all-solid-state flexible supercapacitor

Satpathy, Biraj Kanta ; Nayak, Arpan Kumar ; Chellappan, Retna Raj ; Pradhan, Debabrata (2019) Morphology-dependent charge storage performance of Co3O4 nanostructures in an all-solid-state flexible supercapacitor New Journal of Chemistry, 43 (38). pp. 15177-15186. ISSN 1144-0546

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Official URL: https://doi.org/10.1039/C9NJ03070K

Related URL: http://dx.doi.org/10.1039/C9NJ03070K

Abstract

The increasing demand for energy storage systems with high energy and power densities requires suitable electrode materials that are inexpensive, stable, and efficient. Using a facile synthesis technique that yields such materials in a short duration is the need of the hour. Herein, we demonstrate a microwave-assisted hydrothermal technique to synthesize cobalt hydroxy carbonate hydrate with diverse shapes. Upon annealing under air at 500°C for 3 h, cobalt hydroxy carbonate is converted to phase pure Co3O4 without a significant change in the original morphology, i.e., urchin-like, flower-like, and nanocubes. The flower-like structure showed the highest specific capacitance and thus was used as the positive electrode for an all-solid-state flexible asymmetric supercapacitor (ASC) device. Among the three different carbon-based materials such as graphene hydrogel (GH), reduced graphene oxide, and activated carbon tested for use as negative electrodes, GH showed the best performance. The fabricated flexible Co3O4//GH ASC device affords an energy density of 29 W h kg−1 at a power density of 916 W kg−1 with a coulombic efficiency of ∼97%. The device retains 87% of its initial capacitance after 2000 cyclic runs.

Item Type:Article
Source:Copyright of this article belongs to Royal Society of Chemistry.
ID Code:139179
Deposited On:20 Aug 2025 12:26
Last Modified:20 Aug 2025 12:26

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