石墨烯/二氧化锰复合材料的制备与电化学性能

通过改性二氧化锰和氧化石墨烯片之间的静电自组装制备了层状的rGO/MnO2复合纳米材料。通过XRD分析材料的晶体结构,用扫描电镜观察材料的微观表面形貌。这种材料用来研究其电化学电容性能,结果表明这种纳米复合材料显示出很好的电容性能(在0.2 A/g的电流密度下可达246 F/g)。此外,在2 A/g的电流密度下循环1000次后容量保持率为91%。材料的性能提升是因为复合材料中二氧化锰纳米棒和石墨烯片层很好的贴合,而石墨烯片的加入也大大提高了材料的导电性。

Preparation of rGO/MnO2 Nanocomposites for Electrochemical Capacitors

rGO/MnO2 nanocomposites were first synthesized by electrostatic self-assembly between α-MnO2 nanorods and reduction graphene oxides sheets. The materials were characterized by means of X-ray diffraction, scanning electron microscopy. The novel rGO/MnO2 hybrid materials were used for research of electrochemical capacitive behaviors. The nanocomposites showed enhanced specific capacitance （246 F/g at 0.2 A/g）. Additionally, over 91% of the initial capacitance was retained after repeating the galvanostatic Charge-discharge test for 1000 cycles at 2 A/g. The improved capacitance performance might be attributed to the well attach between MnO2 nanorods and graphene sheets, and the good electrical conductivity of graphene sheets ensured the well performance.