水热法合成Bi_2WO_6/CNOs纳米材料及其电化学性能  

Electrochemical Performance of Bi_2WO_6/CNOs Nanocomposites Synthesized via a Hydrothermal Method

作　　者：王佳玮[1] 杨艳青[1] 高泽宇 梁颖[1] 邓钏 张卫珂[1] WANG Jia-Wei;YANG Yan-Qing;GAO Ze-Yu;LIANG Ying;DENG Chuan;ZHANG Wei-Ke(College of Environmental Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学环境科学与工程学院,太原030024

出　　处：《无机材料学报》2018年第11期1208-1212,共5页Journal of Inorganic Materials

基　　金：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)~~

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Bi_2WO_6/CNOs(CNOs,纳米洋葱碳)和Bi_2WO_6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,Bi_2WO_6/CNOs与纯相Bi_2WO_6的比电容分别为328和218F·g^(-1);电流密度为5mA·cm^(-2)时,经过300次循环,Bi_2WO_6/CNOs的比容量保持率比纯相Bi_2WO_6提高了34.37%。可见,在Bi_2WO_6中加入CNOs能明显改善Bi_2WO_6的电化学性能。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.

关 键 词：钨酸铋 纳米洋葱碳 电化学性能 超级电容器 

分 类 号：TQ127[化学工程—无机化工]