还原氧化石墨烯 / Mn3 O4 纳米复合材料的合成及其在超级电容器中的应用

Synthesis of reduced graphene oxide / Mn3 O4 nanocomposites for supercapacitors

    摘要
  • 摘要: 以改进的 Hummers 法所制氧化石墨烯/ 硫酸锰(GO/ MnSO4 )悬浊液为原料,原位合成 GO/ MnO2 复合物,再经低温热处理制备还原氧化石墨烯/ Mn3O4(rGO/ Mn3O4 )纳米复合材料。 通过改变 GO/ MnSO4 悬浊液中 MnSO4 的质量含量实现 rGO/ Mn3O4 复合物中 Mn3O4 质量分数的可控调变。 该法充分利用氧化石墨烯原液中的锰离子,可节省原料,同时可避免氧化石墨烯繁琐的分离过程并简化实验步骤。 所得复合材料作为超级电容器电极材料展现良好的电化学电容性能,在饱和 K2SO4 电解质溶液和 50 mA·g -1的电流密度下, Mn3O4 质量含量为 88% 时其比电容达 284 F·g -1 。

     

    Abstract: Reduced graphene oxide/ Mn3O4(rGO/ Mn3O4 ) nanocomposites were prepared from MnSO4 and GO produced by a modified Hummers method. The GO was deoxygenated by heat treatment, and MnO2 generated by hydrolysis of MnSO4 was simul-taneously reduced to Mn3O4 . The Mn3O4 content in the composites could be tailored by the volume of supernatant in the pristine GO/ MnSO4 suspension. The maximum specific capacitance of the rGO/ Mn3O4 composite is 284 F·g -1 at 50 mA·g -1 as an anode material in a saturated K2SO4 solution. This approach separates GO from the suspension without complicated procedures, and cheap MnSO4 is used as a Mn3O4 source

     

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