氢气还原制备高电容多孔Mn_(3)O_(4)/rGO复合材料

Preparation of High Capacity Porous Mn_(3)O_(4)/rGO Composite Materials by Hydrogen Reduction

Mn_(3)O_(4)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。本文以实心ε-MnO_(2)微米粉体和具有亲水性的氧化石墨烯(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MnO_(2)/GO复合粉体。然后经一步氢气还原处理,使实心ε-MnO_(2)和GO同步转化为具有纳米多孔结构的多孔Mn_(3)O_(4)和还原氧化石墨烯(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Mn_(3)O_(4)/rGO复合粉体。经电化学测试可知,Mn_(3)O_(4)/rGO复合粉体在2mV/s的扫描速率下的比电容为25.2F/g,且具有较好的电容留存率。

Mn_(3)O_(4) has abundant resources,a stable structure,and high theoretical capacitance,making it a promising supercapacitor material.However,the poor conductivity hinders its application in this field.In this work,solid-formε-MnO_(2) micron powders and hydrophilic GO powders were used as raw materials to prepare MnO_(2)/GO composite powders with good contact by magnetic stirring and freeze drying in deionized water.Then,through a onestep hydrogen reduction treatment,the solidε-MnO_(2) and GO were synchronously converted into porous Mn_(3)O_(4) and rGO with nanoporous structures,thereby obtaining high-performance Mn_(3)O_(4)/rGO composite powders with uniform dispersion,high specific surface area,and excellent conductivity.The electrochemical test showed that the specific capacitance of Mn_(3)O_(4)/rGO composite powder is 25.2 F/g at the scanning rate of 2 mV/s,and it has a good capacitance retention rate.