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Hierarchical CuO nanorod arrays in situ generated on three-dimensional copper foam via cyclic voltammetry oxidation for high-performance supercapacitors

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Abstract

Unique hierarchical cyclic voltammetry oxidation (CVO) Cu@CuO nanorod arrays were obtained by an in situ oxidation reaction with the combination of calcination and cyclic voltammetry oxidation strategies. The areal capacitance of this CVO Cu@CuO electrode reaches 1.674 F cm−2 (594.27 F g−1) at a current density of 2 mA cm−2, which is significantly higher than those of Cu@Cu(OH)2 (0.207 F cm−2) and Cu@CuO (1.307 F cm−2) electrodes. In addition, an excellent rate capacity (1.085 F cm−2 at a current density of 30 mA cm−2) and remarkable cycling stability (96.45% after 4000 cycles) were observed. Additionally, the CVO Cu@CuO nanorod arrays can also be utilized as the positive electrode to manufacture asymmetric supercapacitor (ASC) devices, realizing a high cell voltage of 1.5 V and an outstanding energy density of up to 35.43 W h kg−1 at a power density of 520.99 W kg−1. The excellent electrochemical properties can be credited to the unique hierarchical structures. This work makes it attractive in that the CVO Cu@CuO can be utilized as a potential electrode material for supercapacitors.

Graphical abstract: Hierarchical CuO nanorod arrays in situ generated on three-dimensional copper foam via cyclic voltammetry oxidation for high-performance supercapacitors

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Publication details

The article was received on 29 Jan 2018, accepted on 02 May 2018 and first published on 03 May 2018


Article type: Paper
DOI: 10.1039/C8TA00945G
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Hierarchical CuO nanorod arrays in situ generated on three-dimensional copper foam via cyclic voltammetry oxidation for high-performance supercapacitors

    Y. Liu, X. Cao, D. Jiang, D. Jia and J. Liu, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C8TA00945G

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