A kind of nano mn3o4 with manganese defect, its preparation method and application
A defect and nano-technology, applied in the field of catalysts, can solve the problems of metal defects and increase active sites, so as to improve the transfer rate, optimize the preparation process, and improve the activity.
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[0026] The synthesis method is a solvothermal-roasting method, and the specific steps are as follows:
[0027] 1. Weigh an appropriate amount of manganese salts (manganese acetate, manganese oxalate, manganese chloride, manganese nitrate and manganese sulfate) and glycerin, and add them to 50-800mL of absolute ethanol successively, wherein the mass ratio of manganese salts to glycerol is 1:5 ~1:30;
[0028] 2. Transfer the above-mentioned mixed solution to an autoclave with a polytetrafluoroethylene liner, heat and stir evenly, seal it and put it in an oven at 150-220°C for 0.5-36 hours under autogenous pressure;
[0029] 3. Take rapid cooling measures to the autoclave after the reaction, and cool to room temperature;
[0030] 4. Wash and centrifuge the resulting precipitate, and dry it in an oven at 60-100°C for at least 12 hours to obtain a white or light brown powder;
[0031] 5. Put the powder in a muffle furnace and bake it at 300-550°C for 2-20 hours, and finally get t...
example 1
[0033] Example 1: 1.0 g of manganese acetate, 5.0 g of glycerin and 100 mL of ethanol were mixed, and the homogeneous solution obtained by stirring was transferred to an autoclave polytetrafluoro liner. Put the polytetrafluoroethylene liner into the autoclave, seal it and place it in a constant temperature oven, and react in the oven at 180°C for 2 hours. After the reaction is over, the autoclave is quenched. After the autoclave was cooled to room temperature, the hydrothermal precipitate was taken out, and after being centrifuged and washed with ethanol, it was dried. The dried powder was calcined at 300 °C for 3 h in a muffle furnace, and then cooled naturally. The potential of the prepared sample as a cathode material for the electrocatalytic oxygen reduction reaction is 0.95V vs. RHE, basically reaching the performance level of Pt.
example 2
[0034] Example 2: Mix 0.5g of manganese oxalate, 6.0g of glycerin and 50mL of ethanol, and stir the obtained homogeneous solution into an autoclave polytetrafluoro liner. Put the polytetrafluoroethylene liner into the autoclave, seal it and place it in a constant temperature oven, and react in the oven at 210°C for 1.0h. After the reaction is over, the autoclave is quenched. After the autoclave was cooled to room temperature, the hydrothermal precipitate was taken out, and after being centrifuged and washed with ethanol, it was dried. The dried powder was calcined at 350 °C for 5 h in a muffle furnace, and then cooled naturally. The potential of the prepared sample as a cathode material for the electrocatalytic oxygen reduction reaction is 0.93V vs. RHE, which is close to the performance level of Pt.
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