表面修饰的碳纳米管用于非水系超级电容器的研究

Surface Modified Carbon Nanotubes for Supercapacitor Electrode Materials in Non-aqueous System

该文报道了一种铬酸洗液室温氧化碳纳米管的方法,并将氧化后的碳纳米管应用于超级电容器有机电解质体系中,研究了氧化时间对比电容的影响规律。发现氧化后的碳纳米管构筑的超级电容器电容性能有显著提高,这归因于铬酸洗液处理碳纳米管时,改变了碳纳米管表面的拓扑结构,在其表面引入了羟基(-OH),羰基(>C=O)和羧基(-COOH)等基团,这些基团的引入赋予了材料的赝电容特性,从而使得比电容显著提高。结果表明铬酸洗液室温氧化碳纳米管20分钟后比电容值达到最优。

In this paper, a method by potassium dichromate lotion to oxidize surfaces of carbon nanotubes （CNTs） at room temperature leading to enhanced electrochemical capacitances was reported. Specific capacitance of the oxidized CNTs enhanced due to the generation of groups such as hydroxyl （-OH）, carbonyl （〉C=O） and carboxyl （-COOH）. With the longer oxidized time, specific capacitance of oxidized CNTs increases. Oxidized time is up to 20 minutes, the supercapacitive performance is to achieve the best.