无机材料学报 ›› 2018, Vol. 33 ›› Issue (11): 1208-1212.doi: 10.15541/jim20180113

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水热法合成Bi2WO6/CNOs纳米材料及其电化学性能

王佳玮(), 杨艳青, 高泽宇, 梁颖, 邓钏, 张卫珂()   

  1. 太原理工大学 环境科学与工程学院, 太原 030024
  • 收稿日期:2018-03-14 修回日期:2018-04-15 出版日期:2018-11-16 发布日期:2018-10-20
  • 作者简介:

    作者简介: 王佳玮(1993-), 女, 硕士研究生. E-mail: 812308622@qq.com

  • 基金资助:
    中国博士后第59批面上基金(2016M592654);山西省基础研究计划项目(2015021062);山西省高等学校科技创新研究项目(STIP, 2016147)

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

Jia-Wei WANG(), Yan-Qing YANG, Ze-Yu GAO, Ying LIANG, Chuan DENG, Wei-Ke ZHANG()   

  1. College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2018-03-14 Revised:2018-04-15 Online:2018-11-16 Published:2018-10-20
  • Supported by:
    The 59th Batch of Open Category China Postdoctoral Funds (2016M592654);Natural Science Foundation of Shanxi Province (2015021062);Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (STIP, 2016147)

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