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Fabrication of a 1D Mn3O4 nano-rod electrode for aqueous asymmetric supercapacitors and capacitive deionization

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Abstract

One-dimensional manganese oxide presents distinctly stable properties and exhibits excellent electrochemical performance in neutral aqueous solution as a supercapacitor. Here, we successfully prepare a variety of Mn3O4 nano-rods with different micro-morphologies and nano-structures and show that 107.5 nm Mn3O4 long-rod electrodes exhibit a high specific capacitance of 136.5 F g−1 at a current density of 0.1 A g−1. An aqueous asymmetric supercapacitor device with a maximum work voltage of 1.8 V and high power density is fabricated by using Mn3O4 long-rods as the positive electrode and reduced graphene oxide as the negative electrode. Moreover, this asymmetric capacitor device displays a remarkable electro-adsorption performance, with a mean rate of 0.90 mg g−1 min−1 of Na2SO4 solution and an initial concentration of 500 mg L−1, for capacitive deionization. Furthermore, during the desorption processes, waste energy can power one red LED indicator efficiently for at least 5 min, realizing effective energy re-utilization.

Graphical abstract: Fabrication of a 1D Mn3O4 nano-rod electrode for aqueous asymmetric supercapacitors and capacitive deionization

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Publication details

The article was received on 18 Sep 2018, accepted on 25 Oct 2018 and first published on 27 Oct 2018


Article type: Research Article
DOI: 10.1039/C8QI00993G
Citation: Inorg. Chem. Front., 2018, Advance Article
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    Fabrication of a 1D Mn3O4 nano-rod electrode for aqueous asymmetric supercapacitors and capacitive deionization

    H. Zhang, D. Liu, Y. Wei, A. Li, B. Liu, Y. Yuan, H. Zhang, G. Li and F. Zhang, Inorg. Chem. Front., 2018, Advance Article , DOI: 10.1039/C8QI00993G

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