摘要
以钨酸(H_2WO_4)为原料,过氧钨酸(H_4WO_3 (O_2)_2)为前驱体,乙酸铵(CH_3COONH_4)为辅助剂,采用水热法在碳布上制备了一系列氧化钨(WO3)电极。利用X-射线衍射仪(XRD)及扫描电子显微镜(SEM)对水热合成的WO_3~a电极进行结构表征。在0.5 M H_2SO_4溶液中,采用三电极体系,-0.7～0V(vs.SCE)的电位范围对一系列WO3电极进行循环伏安(CV)和恒电流充放电(CP)测试。考察了前驱液中CH_3COONH_4浓度、搅拌时间、双氧水(H2O2)的用量对WO3电极的微观形貌以及电化学性能的影响。其中1.33g H_2WO_4、0.1M CH3COONH4、6mL H_2O_2(30%)、搅拌10h得到前驱液,在180℃条件下水热反应12h,得到具有六方结构和单斜结构的纳米WO_3~a。在这一条件下合成的WO_3~a电极具有最优的电化学性能,比电容可达到4.53F/cm^2。
A series of tungsten oxide(WO 3)electrodes were synthesized by hydrothermal method,with tungstic acid(H 2WO 4)as a raw material,peroxotungstic acid(H 4WO 3(O 2)2)as precursor and ammonium acetate(CH3COONH 4)as auxiliary.The WO a 3 were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM).In 0.5 M H 2SO 4 solution the potential range from-0.7~0(vs.SCE)scanned for cyclic voltammetry(CV)and chronopotentiometry(CP)tests of a series of WO 3 electrodes.The effects of CH 3COONH 4,H 2O 2 concentration,and stirring time on the microstructure and electrochemical properties of the products were studied.The concentrations of 0.1 M of CH 3COONH 4,1.33 g of H 2WO 4 and 6 mL of 30%H 2O 2 were stirred for 10 h to obtain a precursor solution,which was hydrothermally reacted at 180℃for 12 h to obtain with hexagonal WO a 3 and monoclinic WO a 3.The WO a 3 electrode showed the best electrochemical activity and the area specific capacitance could reach 4.53 F/cm^2.
作者
白明华
刘锐
于湛
王莹
付雅君
赵震
BAI Minghua;LIU Rui;YU Zhan;WANG Ying;FU Yajun;ZHAO Zhen(College of Chemistry and Chemical Engineering,Shenyang Normal University,Shenyang 110034,China;Insititute of Catalysis for Energy and Environment,Shenyang Normal University,Shenyang 110034,China;State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,China)
出处
《沈阳师范大学学报（自然科学版）》
CAS
2018年第5期385-390,共6页
Journal of Shenyang Normal University:Natural Science Edition
基金
辽宁省自然科学基金资助项目(20170540818)
辽宁省高等学校基本科研项目(LQN201705)
关键词
氧化钨
水热法
电化学性能
tungsten oxide
hydrothermal method
electrochemical properties
