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Urchin-like MgCo2O4@PPy Core-Shell Composite Grown on Ni Foam for a High-Performance All-Solid-State Asymmetric Supercapacitor

Abstract

In recent years, the electrochemical properties of supercapacitors have been greatly improved due to the continuous improvement of composite material. In this study, an urchin-like MgCo2O4@PPy/NF (MgCo2O4@polypyrrole/Ni foam) core-shell structure composite material is successfully developed as an electrode for supercapacitors. The MCP-2 composite material obtained with the method of hydrothermal and in-situ chemical oxidative polymerization shows a high specific capacitance of 1079.6 F g-1 at a current density of 1 A g-1, which is much higher than that of MC (783.6 F g-1) under the same condition. Simultaneously, it has a low resistance and an excellent cycling stability of 97.4% after 1000 cycles. Furthermore, an all-solid-state asymmetric supercapacitor (ASC) is assembled using MCP-2 as the positive electrode and activated carbon (AC) as the negative electrode. The MCP-2//AC ASC exhibits a high specific capacitance (94 F g-1 at a current density of 0.4 A g-1), a rate capability (33.4 Wh kg-1 at a power density of 320 W kg-1), a high volumetric energy density (17.18 mWh cm-3 at a volumetric power density of 0.16 W cm-3) and an excellent cycling stability (retaining 91% of the initial value after 10000 cycles). Simultaneously, the device has low leakage current and excellent self-discharge characteristics. All these indicates that it is a good energy storage device, which can support two LEDs to work for 20 minutes. These results indicate that the MCP-2//AC ASC will play an important role in energy structure in the future.

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Publication details

The article was received on 20 Mar 2018, accepted on 04 May 2018 and first published on 07 May 2018


Article type: Paper
DOI: 10.1039/C8NR02311E
Citation: Nanoscale, 2018, Accepted Manuscript
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    Urchin-like MgCo2O4@PPy Core-Shell Composite Grown on Ni Foam for a High-Performance All-Solid-State Asymmetric Supercapacitor

    H. Gao, X. Wang, G. Wang, C. Hao, S. Zhou and C. Huang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR02311E

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