水热法合成Bi2WO6/CNOs纳米材料及其电化学性能

doi:10.15541/jim20180113

摘要/Abstract

摘要：

为了提高超级电容器的性能, 尽可能减少环境污染, 电极材料尤其是低成本、高能量密度的环保型电极材料受到人们越来越多的关注。本研究采用水热法制备了Bi₂WO₆/CNOs (CNOs, 纳米洋葱碳)和Bi₂WO₆纳米材料。采用扫描电子显微镜(SEM)和X射线晶体衍射(XRD)对产物的形貌、结构进行分析, 并通过循环伏安法、恒电流充放电测试、交流阻抗对材料的电化学性能进行评价。结果表明, 以1 mol·L^-1 KOH为电解液, 电流密度为2 mA·cm^-2时, Bi₂WO₆/CNOs与纯相Bi₂WO₆的比电容分别为328和218 F·g^-1; 电流密度为5 mA·cm^-2时, 经过300次循环, Bi₂WO₆/CNOs的比容量保持率比纯相Bi₂WO₆提高了34.37%。可见, 在Bi₂WO₆中加入CNOs能明显改善Bi₂WO₆的电化学性能。

关键词: 钨酸铋, 纳米洋葱碳, 电化学性能, 超级电容器

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

中图分类号:

TQ127

王佳玮, 杨艳青, 高泽宇, 梁颖, 邓钏, 张卫珂. 水热法合成Bi₂WO₆/CNOs纳米材料及其电化学性能[J]. 无机材料学报, 2018, 33(11): 1208-1212.

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.

图/表 5

图1 (a) CNOs、(b) Bi2WO6和(c) Bi2WO6/CNOs的SEM照片以及(d) XRD图谱

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

图2 不同扫描速率下(a) Bi2WO6和(b) Bi2WO6/CNOs的CV曲线

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

图3 Bi2WO6 (a)和Bi2WO6/CNOs (b)的充放电曲线

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

图4 Bi2WO6和Bi2WO6/CNOs的充放电循环性能图

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

图5 Bi2WO6和Bi2WO6/CNOs的Nyquist图谱, 插图为放大的高频区域

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

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水热法合成Bi₂WO₆/CNOs纳米材料及其电化学性能

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

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