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Synthesis of 3D Hierarchical Porous Ni-Co Layered Double Hydroxide/N-doped Reduced Graphene Oxide Composites for Supercapacitor Electrodes

Abstract

In this work, three-dimensional porous Ni-Co layered double hydroxide nanosheets are vertically decorated on N-doped reduced graphene oxide via a simple one-step microwave-assisted hydrothermal process. The incorporated N-doped reduced graphene oxide brings the following advantages: firstly, the improved hydrophilicity of the N-doped reduced graphene oxide offers more nucleation sites to grow layered double hydroxide nanosheets on surface. Secondly, the addition of N-doped reduced graphene oxide can greatly enhance the conductivity and specific surface area of the composites, thus result in better capacitance performance and improved rate capability. This composite possesses high specific capacitance of 1720 F g-1 at a current density of 3 A g-1 and remain 960 F g-1 at a high current density of 50 A g-1. The asymmetric supercapacitor assembled by adopting the prepared composites as the positive electrode and activated carbon as the negative electrode achieves high energy density of 31.2 Wh kg-1 at the power density of 0.354 kW kg-1 and a good long-time cycling stability (83% retention over 10000 cycles).

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Publication details

The article was received on 21 Oct 2018, accepted on 03 Dec 2018 and first published on 05 Dec 2018


Article type: Research Article
DOI: 10.1039/C8QI01132J
Citation: Inorg. Chem. Front., 2018, Accepted Manuscript
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    Synthesis of 3D Hierarchical Porous Ni-Co Layered Double Hydroxide/N-doped Reduced Graphene Oxide Composites for Supercapacitor Electrodes

    W. Wang, N. Zhang, Z. Ye, Z. Hong and M. Zhi, Inorg. Chem. Front., 2018, Accepted Manuscript , DOI: 10.1039/C8QI01132J

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