Electrochemical Performance of Bi2WO6/CNOs Nanocomposites Synthesized via a Hydrothermal Method

doi:10.15541/jim20180113

Abstract

Abstract:

In order to enhance the performance of supercapacitor and reduce environmental pollution as far as possible, electrode materials especially low-cost and eco-friendly electrode materials with high energy density have attracted a great deal of attention. In this paper, Bi₂WO₆/CNOs (CNOs, Carbon Nano Onions) and Bi₂WO₆ nanocomposites have been synthesized via a hydrothermal method. And the structures and morphologies of samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical performances of the as-prepared samples were investigated by cyclic voltammetry, galvanostatic charge - discharge measurements and electrochemical impedance spectroscopy. At a current density of 2 mA·cm^-2, the specific capacitance of the Bi₂WO₆/CNOs and Bi₂WO₆ was 328 F·g^-1 and 218 F·g^-1 with 1 mol·L^-1 KOH served as electrolyte, respectively. After 300 charge-discharge cycles at a current density of 5 mA·cm^-2, the specific capacitance of the Bi₂WO₆/CNOs improved 34.37% compared with pure Bi₂WO₆. Thus, CNOs can enhance the electrochemical performance of Bi₂WO₆ obvously.

Key words: Bi2WO6, carbon nano onions, electrochemical analysis, supercapacitors

CLC Number:

TQ127

WANG Jia-Wei, YANG Yan-Qing, GAO Ze-Yu, LIANG Ying, DENG Chuan, ZHANG Wei-Ke. Electrochemical Performance of Bi₂WO₆/CNOs Nanocomposites Synthesized via a Hydrothermal Method[J]. Journal of Inorganic Materials, 2018, 33(11): 1208-1212.

Figures/Tables 5

Fig. 1 SEM images of (a) CNOs, (b) Bi2WO6 and (c) Bi2WO6/ CNOs samples; (d) XRD patterns of CNOs, Bi2WO6 and Bi2WO6/CNOs samples

Fig. 2 CV curves of (a) Bi2WO6 and (b) Bi2WO6/CNOs samples at various scan rates

Fig. 3 Charge-discharge curves of Bi2WO6 (a) and Bi2WO6/ CNOs (b) samples at various current density

Fig. 4 Capacitance retention of Bi2WO6 and Bi2WO6/CNOs samples as function of charge-discharge cycling number at a constant current density of 5 mA·cm-2

Fig. 5 Nyquist plots of Bi2WO6 and Bi2WO6/CNOs samples with inset showing the enlarged high-frequency region

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Electrochemical Performance of Bi₂WO₆/CNOs Nanocomposites Synthesized via a Hydrothermal Method

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