CuMnO2-reduced graphene oxide nanocomposite as a free-standing electrode for high-performance supercapacitors

[Display omitted] •Direct deposition of rGO-CuMnO2 on Ni foam was done through hydrothermal method.•The rGO-CuMnO2/NF is a free-standing CuMnO2 electrode for supercapacitors.•A specific capacitance of 1727 F g−1 was achieved for the rGO-CuMnO2/NF electrode.•The rGO-CuMnO2/NF electrode showed an exce...

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Veröffentlicht in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2019-11, Vol.375, p.121966, Article 121966
Hauptverfasser: Bahmani, Farzaneh, Kazemi, Sayed Habib, Wu, Yuhan, Liu, Long, Xu, Yang, Lei, Yong
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Sprache:eng
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Zusammenfassung:[Display omitted] •Direct deposition of rGO-CuMnO2 on Ni foam was done through hydrothermal method.•The rGO-CuMnO2/NF is a free-standing CuMnO2 electrode for supercapacitors.•A specific capacitance of 1727 F g−1 was achieved for the rGO-CuMnO2/NF electrode.•The rGO-CuMnO2/NF electrode showed an excellent cycle life stability.•The rGO-CuMnO2 based asymmetric device delivered an energy density of 37.5 Wh kg−1. Free-standing electrodes have attracted wide attention for advanced supercapacitors. Herein, direct deposition of CuMnO2 and CuMnO2-reduced graphene oxide (rGO) nanocomposite on nickel foam (NF) substrates was performed through a simple hydrothermal process. The simultaneous deposition makes full use of the synergistic effect formed by the large pseudocapacitance of CuMnO2 and excellent electrical conductivity of rGO, which results a greater performance improvement of the nanocomposite comparing with that of bare CuMnO2. Remarkably, the CuMnO2-rGO/NF electrode displays a large specific capacitance of 1727 F g−1 at 3 A g−1 and manifests exceptional cycling stability with a retention ratio of 125% of the initial capacitance over consecutive 5000 cycles. Furthermore, a rGO/NF//CuMnO2-rGO/NF asymmetric supercapacitor exhibits great electrochemical performance by delivering high energy density (37.5 Wh kg−1) and high power density (4250 W kg−1) as well as excellent cycling stability (3.3% decay after 4000 cycles). The presented results suggest that CuMnO2-rGO nanocomposite can be considered as a potential candidate for highly stable and high-rate supercapacitors.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2019.121966