A shape-controllable MNO 2 Preparation methods and applications of nanomaterials
A technology of nanomaterials and morphology, which is applied in the preparation and application field of MnO2 nanomaterials with controllable morphology, can solve the problems of complicated process, poor morphology and structure, long reaction time, etc. Conductivity and capacity, the effect of facilitating large-scale implementation
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Embodiment 1
[0031] A shape-controllable MnO 2 The preparation method of nanometer material, comprises the following steps:
[0032] (1) choose potassium bromate as strong oxidizing agent, manganese sulfate is as manganese source; The mass ratio of concentrated nitric acid, potassium bromate and manganese sulfate is 20:1:0.5, then adding potassium bromate and manganese sulfate successively is in the concentrated nitric acid of 98%, Stir mechanically at 60°C for 60min, then transfer to a high-pressure reactor, and react at 120°C for 24h;
[0033] (2) The product is subjected to suction filtration, washed with water to neutrality, and then dried to obtain MnO 2 Nanomaterial, its productive rate is 82%, and its SEM figure and XRD figure are respectively as follows figure 1 , 2 shown, from figure 1 It can be seen that the MnO obtained in this example 2 The nanomaterials are spherical, with an average particle size of 200nm.
[0034] The MnO obtained in this embodiment 2 Nanomaterials: c...
Embodiment 2
[0036] A shape-controllable MnO 2 The preparation method of nanometer material, comprises the following steps:
[0037] (1) choose potassium bromate as strong oxidizing agent, manganese sulfate is as manganese source; The mass ratio of concentrated nitric acid, potassium bromate and manganese sulfate is 20:1.5:0.5, then adding potassium bromate and manganese sulfate successively is in the concentrated nitric acid of 98%, Stir mechanically at 60°C for 60min, then transfer to a high-pressure reactor, and react at 120°C for 24h;
[0038] (2) The product is subjected to suction filtration, washed with water to neutrality, and then dried to obtain MnO 2 Nanomaterials, the yield of which is 85%, and its SEM image is shown in image 3 As can be seen from the figure, the MnO obtained in this embodiment 2 Nanomaterials are porous and hollow spherical, with an average particle size of 900nm.
[0039] The MnO obtained in this embodiment 2 When nanomaterials are used as supercapacito...
Embodiment 3
[0041] A shape-controllable MnO 2 The preparation method of nanometer material, comprises the following steps:
[0042] (1) choose potassium bromate as strong oxidizing agent, manganese sulfate is as manganese source; The mass ratio of concentrated nitric acid, potassium bromate and manganese sulfate is 20:1:1, then adding potassium bromate and manganese sulfate successively is in the concentrated nitric acid of 98%, Stir mechanically at 60°C for 60min, then transfer to a high-pressure reactor, and react at 180°C for 24h;
[0043] (2) The product is subjected to suction filtration, washed with water to neutrality, and then dried to obtain MnO 2 Nanomaterials, the yield of which is 81%, and its SEM image is shown in Figure 4 As can be seen from the figure, the MnO obtained in this embodiment 2 Nanomaterials are in the form of nanowires.
[0044] The MnO that this embodiment obtains 2 When nanomaterials are used as supercapacitor electrode materials, their specific capacit...
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