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Nanocrystalline LaOx/NiO composite as high performance electrodes for supercapacitors

Abstract

Nanocrystalline LaOx/NiO composite electrodes were synthesized via two types of facile cathodic electrodeposition methods onto nickel foams followed by thermal annealing without any binders. Scanning electron microscopy and transmission electron microscopy investigation revealed that the LaOx nanocrystalline particles with an average diameter of 50 nm are uniformly distributed in the NiO layer or alternately deposited with NiO layer onto the substrate. It is speculated that LaOx particles can participate in the faradic reaction directly and offer more redox sites. Besides, the unique Ni/La layered structure facilitates the diffusion of ions and retards the electrode polarization, thus leading to better rate capability and cycling stability of NiO. As a result, the obtained electrodes display very competitive electrochemical performance (a specific capacitance of 1238 F g-1 at a current density of 0.5 A g-1, excellent rate capability of 86% of the original capacitance at 10 A g-1 and excellent cycling stability of 93% capacitance after 10000 cycles). In addition, asymmetric coin devices were assembled using LaOx/NiO as positive electrode and active carbon as negative electrode. The assembled asymmetric devices demonstrate a high energy density of 13.12 Wh kg-1 at the power density of 90.72 W kg-1.

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Publication details

The article was received on 11 Oct 2017, accepted on 06 Nov 2017 and first published on 07 Nov 2017


Article type: Paper
DOI: 10.1039/C7DT03815A
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Nanocrystalline LaOx/NiO composite as high performance electrodes for supercapacitors

    G. Du, Z. Zeng, B. Xiao, D. Wang, Y. Yuan, X. Zhu and J. Zhu, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT03815A

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