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采用氨基芘、CTAB、芘羧酸等不同酸碱性的有机小分子使石墨纳米片表面功能化,其中,芘羧酸可以对石墨纳米片表面进行非共价键功能化,增大石墨纳米片间的间距,将其剥离成单层、双层或者多层;使MnO_2在石墨纳米片材料上的负载更加均匀。电化学测试结果显示,经芘羧酸修饰的石墨纳米片/MnO_2复合材料的比电容能达到215 F/g,相较于其他2种(Amin、CTAB)修饰的复合材料比电容能分别高出81%和44%,经4 000次循环后容量几乎无衰减,6 000次后电容保持率仍为81%。
The surface of graphite nanosheets was functionalized with small organic acids such as aminopyrene, CTAB and pyrenecarboxylic acid. Among them, pyrenecarboxylic acid could non-covalently functionalize the surface of graphite nanosheets, The separation between the single, double or multi-layer; make MnO2 in the graphite nanosheet material more uniform load. The results of electrochemical tests showed that the specific capacitance of the graphite nanoplatelet / MnO 2 modified by pyrenecarboxylic acid reached 215 F / g, which was higher than that of the other two (Amin, CTAB) modified composites respectively 81% and 44%, almost no attenuation after 4000 cycles, and the capacitance retention after 6 000 cycles remained at 81%.