Issue 56, 2019

Transition metal oxide@hydroxide assemblies as electrode materials for asymmetric hybrid capacitors with excellent cycling stabilities

Abstract

In this work, three-dimensional cactus-like Co3O4@Ni(OH)2 electrode materials are grown directly on Ni foam via a two-step hydrothermal method. The as-prepared products possess a specific capacitance of 464.5 C g−1 at 0.5 A g−1 and 91.67% capacitance retention after 20 000 cycles. The as-assembled device using the as-synthesized samples as positive electrodes delivers an energy density of 112.5 W h kg−1 at a power density of 1350 W h kg−1. The superior electrochemical performance of the electrode materials can be attributed to their unique structure, the synergistic effect between Co3O4 and Ni(OH)2 materials and reversible reaction kinetics. It suggests that the products are potential alternatives in future energy storage devices.

Graphical abstract: Transition metal oxide@hydroxide assemblies as electrode materials for asymmetric hybrid capacitors with excellent cycling stabilities

Article information

Article type
Paper
Submitted
20 Aug 2019
Accepted
28 Sep 2019
First published
11 Oct 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 32510-32516

Transition metal oxide@hydroxide assemblies as electrode materials for asymmetric hybrid capacitors with excellent cycling stabilities

P. Hu, Y. Liu, J. Song, X. Song and X. Wu, RSC Adv., 2019, 9, 32510 DOI: 10.1039/C9RA06514H

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