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Issue 21, 2018
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An urchin-like MgCo2O4@PPy core–shell composite grown on Ni foam for a high-performance all-solid-state asymmetric supercapacitor

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Abstract

In recent years, the electrochemical properties of supercapacitors have been greatly improved due to continuous improvement in their composite materials. In this study, an urchin-like MgCo2O4@PPy/NF (MgCo2O4@polypyrrole/Ni foam) core–shell structure composite material was successfully developed as an electrode for supercapacitors. The MCP-2 composite material, obtained by a hydrothermal method 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 conditions. Simultaneously, it has low resistance and an excellent cycling stability of 97.4% after 1000 cycles. Furthermore, an all-solid-state asymmetric supercapacitor (ASC) was assembled using MCP-2 as the positive electrode and activated carbon (AC) as the negative electrode. The MCP-2//AC ASC exhibits high specific capacitance (94 F g−1 at a current density of 0.4 A g−1), high energy density (33.4 W h kg−1 at a power density of 320 W kg−1), high volumetric energy density (17.18 mW h cm−3 at a volumetric power density of 0.16 W cm−3) and excellent cycling stability (retaining 91% of the initial value after 10 000 cycles). Simultaneously, the device has low leakage current and excellent self-discharge characteristics. All these results indicate that the MCP-2//AC ASC is a good energy storage device; it can support the function of two LEDs for 20 minutes. These results indicate that the MCP-2//AC ASC will play an important role in energy structures in the future.

Graphical abstract: An urchin-like MgCo2O4@PPy core–shell composite grown on Ni foam for a high-performance all-solid-state asymmetric supercapacitor

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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, 2018,10, 10190-10202
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    An 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, 10, 10190
    DOI: 10.1039/C8NR02311E

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