Gh/MnO2/PANI三元纳米杂化电极材料的制备及电性能分析

摘要

为了提高电能源存储材料的电化学性能,制备高性能超级电容器,采用两步法设计制备了一种高性能石墨烯基/二氧化锰/聚苯胺(MnO2-Gh-PANI)三元纳米杂化电极材料.利用水热法实现二氧化锰在石墨烯片层上的沉积,采用化学氧化法将聚苯胺包覆在MnO2-Gh上制备了三元纳米杂化材料.采用SEM、FTIR、XRD和XPS对其形貌和结构进行了分析.电化学性能显示:在三电极测试系统中,MnO2-Gh-PANI三元杂化电极的比电容达到526 F·g-1(0.1A·g-1电流密度),远大于Gh (47 F· g-1)和MnO2-Gh (198 F·g-1)的比电容.在0.1A·g-1电流密度下经过2 000个循环测试,比电容损失约为15％,表现出较好的循环稳定性.具有高性能的三元纳米杂化电极电材料归因于独特的结构和三种单一材料的协同效应.%In order to improve the electrochemical performance of electric energy storage materials,and prepare high performance supercapacitors,a ternary graphene/manganese dioxide/polyaniline nanocomposite (MnO2-Gh-PANI) is designed and fabricated via a facile two-step approach.Manganese dioxide dispersed on grapheme sheets is achieved by a hydrothermal method,followed by coating with polyaniline through in situ polymerization process.The morphology and structure are analyzed by SEM,FTIR,XRD and XPS.Electrochemical measurements demonstrate that the specific capacitance of the nanocomposites is up to 526 F · g-1at a current density of 0.1 A · g-1 using a three electrode system,which are higher than those of Gh (47 F · g-1) and MnO2-Gh (198 F · g-1).About 15％ of the capacitance is losed after repeating test for 2 000 cycles,demonstrating a high cycling stability.This is attributed to its well-designed nanostructure and the synergistic effects of the individual components.