Electrochemical properties of PEDOT/WO3 composite films for high performance supercapacitor application
Electrochemical properties of PEDOT/WO3 composite films for high performance supercapacitor application
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DOI：
10.1016/j.electacta.2019.01.007
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发表时间：
2019-03
影响因子：
6.6
通讯作者：
D. V. Zhuzhel’skii;E. G. Tolstopjatova;S. Eliseeva;A. Ivanov;S. Miao;V. Kondratiev
中科院分区：
文献类型：
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作者：
D. V. Zhuzhel’skii;E. G. Tolstopjatova;S. Eliseeva;A. Ivanov;S. Miao;V. Kondratiev
在导电聚合物聚-3，4-乙撑二氧噻吩（PEDOT）膜修饰的玻碳电极上，从同聚钨酸盐的亚稳酸性溶液中电沉积氧化钨。采用EQCM对氧化钨在聚合物基体中的电化学沉积过程中PEDOT/WO 3复合膜的形成过程进行了质量分析。利用SEM、TEM和EDX分析研究了WO 3沉积层的形貌，包括元素分布和主要元素的深度浓度分布。复合材料的SEM和TEM图像显示WO 3沉淀物分散分布在PEDOT多孔基体中，具有高的比表面积和孔容，有利于电荷传输。采用循环伏安法、恒流充放电法和交流阻抗法研究了PEDOT/WO 3在0.5 M H2SO 4中的电化学行为。所得PEDOT/WO 3复合电极中的WO 3组分在-0.3-0.0 V电位范围内表现出689 F g-1的高比电容。本工作提出了一种合成高比电容PEDOT/WO 3复合材料的简单方法。结果表明，PEDOT/WO 3复合材料是一种很有前途的超级电容器电极材料。
Tungsten oxide was electrochemically deposited from a metastable acidic solution of isopolytungstate on glassy carbon electrodes coated by the films of a conducting polymer poly-3,4-ethylenedioxythiophene (PEDOT). The formation of PEDOT/WO3composite films during electrochemical deposition of tungsten oxide into the polymer matrix was gravimetrically monitored by EQCM. The morphology of WO3deposits was studied using SEM, TEM and EDX analysis, including element mapping and depth concentration profile of main elements. SEM and TEM images of PEDOT/WO3composites show disperse distribution of WO3precipitates in the porous matrix of PEDOT, possessing high surface area and pore volume, effective for charge transport. Electrochemical behavior of PEDOT/WO3was investigated in 0.5 M H2SO4by cyclic voltammetry, galvanostatic charge-discharge method and electrochemical impedance spectroscopy. The WO3component in the obtained PEDOT/WO3composite electrodes exhibited high specific capacitance of 689 F g−1in the potential range −0.3–0.0 V. The work presents a simple approach for the synthesis of PEDOT/WO3composites with high values of specific capacitance. The obtained results indicate that PEDOT/WO3composite could be a promising electrode material for supercapacitor applications.