氧化石墨烯/聚苯胺材料的制备及其超电容性能研究

Preparation of Graphene Oxide/Polyaniline Composites via Emulsion Polymerization and the Supercapacitance Performance

通过乳液聚合制备具有类似金属导电性和超电容功能的氧化石墨烯/聚苯胺(GO-PANI)复合材料,聚合在组成为水,乙醇,二甲苯和十二烷基苯磺酸(DBSA)的乳液中进行。采用红外光谱对材料进行了表征,采用循环伏安法、交流阻抗和恒电流充放电进行了材料电化学性能的测试。结果表明氧化石墨烯/聚苯胺呈现高的超电容性能。在0.5 A/g电流密度下,摩尔比为3∶7材料的比电容高达444 F/g,远远超过了氧化石墨烯的比电容(134 F/g)。在50 mV/s下循环1000次,GO-PANI(3/7)仍呈现出高的比电容,达到412 F/g,仅减少7.2%。相对于纯聚苯胺比电容下降41.7%,复合材料GO-PANI具有优良的稳定性,显著提高复合材料容量保持率和循环寿命。

Graphene oxide/PANl suprecapacitor materials were prepared using in situ polymerization in emulsion composed of water, ethanol, xylene and dodecylbenzene sulfonic acid （DBSA）. The morphology and electrochemical performance was characterized by FT-IT, cyclic voltammetry, electrochemical impedance spectroscopy and galvanization charge-discharge test, respectively. The results show that graphene oxide/PAN1 showed high capacitance pertbrmance. The specific capacitance as high as 444 F/g of the composite named GO-PANI（3/7） was obtained at the current density of 0.5 A/g, which was far more than graphene oxide （134 F/g）, further characterization by cyclic voltammetry （CV） of 1000 cycles at 50 mV/s showed the capacitance of GO-PANI（3/7） can still maintain 412 F/g, with only a decrease of 7.2 % compared with pure PANI of 41.7 %. Graphene oxide can effectively improve the cycling performance of the composite materials.