摘要
采用化学原位聚合的方法制备了聚吡咯/二氧化钛(PPy/TiO2)复合物,其中聚吡咯和二氧化钛的质量比分别为1∶1、2∶1、3∶1、4∶1,将其作为电化学超级电容器的电极材料,采用扫描电子显微镜和X射线衍射仪研究了PPy/TiO2的形貌和相组成,通过电化学测试研究了PPy/TiO2的电化学性能.结果表明:TiO2均匀地包覆在PPy基体中,PPy/TiO2的电化学性能明显优于纯PPy;当PPy与TiO2的质量比为3∶1时复合材料的电化学性能最佳,即在2 A/g充放电电流密度下,其比电容达到了255.68F/g,比纯PPy提高了2倍左右;在1A/g充放电电流密度下,循环充放电1000圈之后PPy/TiO2的比电容保持率为87.2%,纯PPy的比电容保持率仅为46.9%.
Polypyrrole/titanium dioxide(PPy/TiO2) composites(the mass ratios of polypyrroletotitanium dioxide were 1∶1, 2∶1, 3∶1, and 4∶1) were prepared by chemical in-situ polymerization. As an electrode material of electrochemical supercapacitors, the electrochemical properties of the PPy/TiO2 were studied. Results of scanning electron microscopy and X-ray diffraction indicate that TiO2 particles were uniformly mounted in the PPy matrix. Test results show that the electrochemical performance of PPy/TiO2 was significantly better than that of pure-PPy. When the mass ratio of PPy to TiO2 was 3∶1(PPy/TiO(2(3∶1))), the electrochemical performance of the composite was the best. At 2 A/g charging/discharging current density, the specific capacitance of PPy/TiO(2(3∶1)) reached 255.68 F/g, which was twice higher than that of pure-PPy. At 1 A/g charging/discharging current density, the specific capacitance retention rate of PPy/TiO(2(3∶1)) reached 87.2% after 1 000 cycles, and the retention rate of pure-PPy was only 46.9%.
作者
吴佩琦
王景平
吴成俊
任佳悦
白杨
WU Peiqi;WANG Jingping;WU Chengjun;REN Jiayue;BAI Yang(Chemistry and Chemical Engineering,Shaanxi University of Science and Technology,Xi'an 710021,China;Electrical and Information Engineering,Shaanxi University of Science and Technology,Xi'an 710021,China)
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2019年第3期90-96,共7页
Materials Science and Technology
基金
西安市科技计划项目(2017068CG/RC031(SXKD007))
关键词
聚吡咯
二氧化钛
超级电容器
比电容
电极材料
polypyrrole
titanium dioxide
supercapacitor
specific capacitance
electrode material
