不同形貌Bi2WO6/CNOs复合材料的电化学性能研究  

Study on Electrochemical Properties of Bi2WO6/CNOs Composites with Different Morphologies

作　　者：张涛[1,2] 张卫珂[1] ZHANG Tao;ZHANG Wei-ke(College of Environment Science and Technology,Taiyuan University of Technology,Taiyuan 030000,China;Advanced Materials Institute,Shandong Academy of Science,Jinan 250014,China)

机构地区：[1]太原理工大学环境科学与工程学院,太原030000 [2]山东省科学院新材料研究所,济南250014

出　　处：《人工晶体学报》2019年第12期2265-2269,共5页Journal of Synthetic Crystals

基　　金：山西省重点研发计划(201803D31049)

摘　　要：低污染、高能量的超级电容器是目前研究的重点。本文利用水热法合成了Bi2WO6/CNOs复合材料,并通过改变前驱体的pH值来调整复合材料的形态,在pH值为3和11的条件下合成了花状片层结构和块状结构的复合材料,并将其作为赝电容的电极材料。采用循环伏安法、恒电流充放电法和电化学阻抗法研究了制备的Bi2WO6/CNOs复合材料的电化学性能。结果表明,在电流密度为10 mA/cm^2时,以1 mol/L KOH溶液为电解液的条件下,pH=3时花状片层结构的Bi2WO6/CNOs复合材料的比电容为152.7 F/g,大于pH=11时复合材料的比电容。这主要是由于CNOs能均匀分散在Bi2WO6的片层之间,从而起到良好的支撑和电子传输作用。Low pollution and high energy supercapacitors are the focus of current research.Bi2WO6/CNOs composites were synthesized by hydrothermal method.The morphology of the composites was adjusted by changing the pH value of the precursors.The composites with flower-like lamellar structure and block structure were synthesized under the conditions of pH 3 and 11.The composites were used as electrodes for pseudocapacitors.The electrochemical properties of Bi2WO6/CNOs composites were studied by cyclic voltammetry,galvanostatic charge-discharge method and electrochemical impedance method.The results show that the specific capacitance of Bi2WO6/CNOs composite with flower-like lamellar structure is 152.7 F/g when the current density is 10 mA/cm^2 and the solution of 1 mol/L KOH is used as electrolyte at pH=3,which is larger than that of Bi2WO6/CNOs composite at pH=11.This is mainly because CNOs can be evenly dispersed between the layers of Bi 2WO 6,thus playing a good supporting and electronic transmission role.

关 键 词：Bi2WO6 纳米洋葱碳 赝电容 形貌 

分 类 号：X703[环境科学与工程—环境工程] O643.36[理学—物理化学]