Title

Designing 3D interconnected continuous nanoporous Co/CoO core-shell nanostructure electrodes for a high-performance pseudocapacitor

RIS ID

112348

Publication Details

Qing, C., Zhou, Q., Qu, G., Chen, X., Wang, H., Sun, D., Wang, B., Xu, L. & Tang, Y. (2017). Designing 3D interconnected continuous nanoporous Co/CoO core-shell nanostructure electrodes for a high-performance pseudocapacitor. Nanotechnology, 28 (8), 085401-1-085401-14.

Abstract

A high-performance supercapacitor electrode is designed and fabricated with the 3D interconnected continuous nanoporous Co/CoO core-shell hybrid nanostructure grown on nickel foam. The Co/CoO core-shell hybrid nanostructures are obtained via a hydrothermal method, followed by high-temperature annealing in hydrogen atmosphere, and finally placed in air at 50 °C for 1 h. The Co/CoO core-shell nanostructure assembled by a conductive metal-core and a CoO shell, brings low resistance, high specific capacitance of 5.632 F cm−2 and good capability stability (81.5% capacitance retention after 6000 cycles). An asymmetric supercapacitor device built by the Co/CoO (positive electrode) and activated carbon (negative electrode) can deliver a working voltage of 1.7 V and display a high energy density of 0.002 67 Wh cm−2 at a power density of 0.001 62 W cm−2, which is far superior to that of a supercapacitor at a similar power density.

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Link to publisher version (DOI)

http://dx.doi.org/10.1088/1361-6528/aa53be