Mno < Sub > 2 < / Sub > Base Preparation And Electrochemical Properties Of Nanomaterials Research

In this paper, γ-MnO₂nanosheets were prepared by hydrothermal treatment ofKMnO₄, GO（graphite oxide） and hydrochloric acid at120oC for6h. The nanosheetshave a thickness of20-30nm and the particle size of300-400nm. When the scan rateswas2mV/s, the specific capacitances was118F/g in neutral aqueous electrolyte （1MNa₂SO₄）.-MnO₂nanorods were prepared by hydrothermal treatment of KMnO₄, GO（graphite oxide）and sulfuric acid at120oC for3h. The nanorods have a diameter of10-20nm and a length of300-400nm. The introduce of GO reduces the preparationtemperature of nanorods and shorten the reaction time. The electrochemical resultsindicate that-MnO₂nanorods show fine capacitive behavior in neutral aqueouselectrolyte （1M Na₂SO₄）, When the scan rates was2mV/s, the specific capacitanceswas276F/g, This-MnO₂nanorods is a potential electrode material for electrochemicalcapacitors.Layered manganese dioxide was prepared by sol-gel method. The as preparedlayered manganese dioxide was delaminated and charactered by electrochemical test.The electrochemical results indicate that Bir（Na）、Bir（H） before delamination andBir（TMA） after delamination show fine capacitive behavior in neutral aqueouselectrolyte （1M Na₂SO₄）. When the scan rate was2mV/s, the specific capacitanceswere338.24,256.67and403.13F/g, respectively. Layered manganese dioxide dopedwith Co and Ni were prepared by solid state reaction method. The simples before andafter delamination were characterized by electrochemical tests. The results indicate thatdopant could enhance the stability of layered structure, and delamination could enhancethe electrochemical performance. Co doped layered manganese dioxide show finecapacitive behavior in neutral aqueous electrolyte （1M Na₂SO₄）. Co-10as an example,when the scan rates was2mV/s, the specific capacitances of Co-10（K）, Co-10（H） and Co-10（TMA） were313.97,245.37and348.63F/g, respectively.