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Designing graphene-wrapped nanoporous CuCo2O4 hollow spheres electrodes for high-performance asymmetric supercapacitors

Abstract

The increasing demand for green energy storage systems, arising from the rapid development of portable electronics, has triggered tremendous research efforts for designing new or high-performance electrodes. Herein, for the first time, we develop a graphene-wrapped CuCo2O4 hollow spheres electrodes with a 3D composite network, a high surface area of 106.2 m2 g-1 and a nanopores mainly centered at 7.6 nm. This electrode exhibits excellent electrochemical performance with an ultrahigh specific capacitance of 1813 F g−1 at 2 A g-1 (3.63 F cm−2 at 4 mA cm−2) and a significant rate capability of 63% capacitance retention even at an ultrafast rate of 120 mA cm−2. Utilizing this nanocomposite as the positive electrode in a GW-CuCo2O4//rGO asymmetric configuration results in devices with remarkable performance including excellent cycle life (4.8% loss after 6000 cycles), a maximum energy density of 45.2 Wh kg−1 and a power density up to 15 kW kg−1 which is superior to state-of-the-art supercapacitors. The superior electrochemical performance of this electrode has been attributed to the synergic effects between the components and its unique 3D nanoporous composite network that plays a key role in providing high conductivity, rich redox reactions, facile electron transfer, short ion diffusion distance, fast kinetics and great active sites for electrochemical reactions. This work presents a new platform for unique and efficient electrodes for the next generation of high-performance energy storage systems and portable electronics.

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Publication details

The article was received on 07 May 2017, accepted on 14 Jun 2017 and first published on 14 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA03943C
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Designing graphene-wrapped nanoporous CuCo2O4 hollow spheres electrodes for high-performance asymmetric supercapacitors

    S. Kamari Kaverlavania, S. E. Moosavifard and A. Bakouei, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03943C

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