Amorphous Cobalt Boron Alloy@Graphene Oxide Nanocomposites for Pseudocapacitor Applications

doi:10.1016/j.jmst.2016.06.012

Abstract

Abstract:

Amorphous Co-B alloy nanoparticles grown on graphene sheets were synthesized via a chemical reduction approach and successfully used for an application as a pseudocapacitor. This study aims to improve the capacity and cycling stability of amorphous Co-B alloy nanoparticles grown on conductive graphene sheets. The products were characterized by X-ray powder diffraction, scanning electron microscopy, and transmission electron microscopy. As electrode materials for pseudocapacitors, the amorphous Co-B alloy grown on graphene oxide (Co-B@GO) exhibits a high specific capacitance of 460 F g^-1, which is nearly 1.5 times greater than that of bare Co-B nanoparticles at 1 A g^-1. The specific capacitance preserved 84% of the initial capacitance even after 1000 cycles at a scan rate of 10 m V^-1, suggesting its promising potential as pseudocapacitor materials.

Key words: Pseudocapacitor, Electrode, Cobalt-boron alloy, Amorphous alloy, Graphene oxide

Zhang Wei, Du Xiaoli, Tan Yueyue, Hu Jinbo, Li Zhen, Tang Bohejin. Amorphous Cobalt Boron Alloy@Graphene Oxide Nanocomposites for Pseudocapacitor Applications[J]. J. Mater. Sci. Technol., 2017, 33(5): 438-443.

Figures/Tables 5

Fig. 1. XRD patterns of CO-B@GO and GO.

Fig. 2. SEM micrograph of GO (a), TEM micrographs of Co-B (b) and CO-B@GO (c, d). The insets in Fig. 2(c, d) show the SAED patterns of GO and the Co-B@GO nanocomposite, respectively.

Fig. 3. (a) Cyclic voltammetry curves of Co-B and Co-B@GO at a scanning rate of 5 mV s-1; (b) cyclic voltammetry curves of Co-B@GO electrode at different scan rates; (c) the specific capacitance of Co-B and Co-B@GO at different scan rates.

Fig. 4. (a) The charge-discharge curves of Co-B and Co-B@GO at a current density of 1 A g-1; (b) the charge-discharge curves of Co-B@GO at different current densities; (c) the specific capacitance of Co-B@GO at various discharge current densities.

Fig. 5. (a) Impedance spectra of Co-B and Co-B@GO (inset is the equivalent circuit), (b) the magnification of the Nyquist curves, (c) cycling performance of Co-B@GO at a scan rate of 10 m V-1. Z’ is real impedance and Z” is imaginary impedance.

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