氢气还原制备高电容多孔Mn3O4/rGO复合材料

Mn3O4资源丰富、结构稳定，具有较高的理论电容，是一种较有潜力的超级电容器材料，但其较差的导电性却阻碍了其在这方面应用。本论文以实心ε-MnO2微米粉体和具有亲水性的GO粉体为原料，在去离子水中通过磁力搅拌和冷冻干燥制备出具有良好接触的MnO2/GO复合粉体。然后经一步氢气还原处理，使实心ε-MnO2和GO同步转化为具有纳米多孔结构的多孔Mn3O4和RGO，从而获得分散均匀、具有高比表面积和优良导电性的高性能Mn3O4/RGO复合粉体。经电化学测试可知，Mn3O4/RGO复合粉体在2 mV/s的扫描速率下的比电容为25.2 F/g且具有较好的电容留存率。

Preparation of High Capacity Porous Mn3O4/RGO Composite Materials by Hydrogen Reduction

Mn3O4 has abundant resources, a stable structure, and high theoretical capacitance, making it a promising supercapacitor material. However, its poor conductivity hinders its application in this field. In this work, solid-form ε-MnO2 micron powders and hydrophilic GO powders were used as raw materials to prepare MnO2/GO composite powders with good contact by magnetic stirring and freeze drying in deionized water. Then, through a one-step hydrogen reduction treatment, the solid ε-MnO2 and GO were synchronously converted into porous Mn3O4 and RGO with nanoporous structures, thereby obtaining high-performance Mn3O4/RGO composite powders with uniform dispersion, high specific surface area, and excellent conductivity. The electrochemical test shows that the specific capacitance of Mn3O4/RGO composite powder is 25.2 F/g at the scanning rate of 2 mV/s and has good capacitance retention.