Preparation method of perovskite-type lanthanum composite oxide nanotubes
A composite oxide, perovskite-type technology, applied in the field of nanomaterials, can solve the problems of large pipe diameter and complex preparation process, and achieve the effects of low cost, simple process and good electrochemical energy storage characteristics
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[0025] The preparation method of perovskite type lanthanum composite oxide nanotube of the present invention (experimental process is as follows figure 1 shown), the steps are as follows:
[0026] (1) Mix and stir lanthanum nitrate hexahydrate (2mmol), nitrate B (2mmol) and N,N-dimethylformamide (DMF) (50ml) for 1 hour to obtain a mixed system;
[0027] (2) Add 0.9g of polyvinylpyrrolidone K-30 to the mixed system obtained in step (1) under low-speed (200r / min) magnetic stirring, after the solution is mixed evenly, accelerate stirring (700r / min) and heat up to the solution boiling , when the solution evaporates to about 1 / 3 of the volume of the original solution, lower the heating temperature to 88~92°C and keep stirring until the solution becomes a colloid;
[0028] (3) Transfer the obtained colloid to a quartz boat, then put it into a muffle furnace for high-temperature roasting, the roasting temperature is 600-800°C, and the reaction time is 2-4h. After the reaction, the ...
Embodiment 1
[0030] The preparation method of the perovskite type lanthanum composite oxide nanotube of the present embodiment, the steps are as follows:
[0031] (1) Mix and stir 0.866g (2mmol) of lanthanum nitrate hexahydrate, 0.808g (2mmol) of ferric nitrate nonahydrate and 50mL of N,N-dimethylformamide (DMF) for 1 hour to obtain a mixed system;
[0032] (2) Add 0.9g polyvinylpyrrolidone K-30 to the mixed system obtained in step (1) under low-speed (200r / min) magnetic stirring, after the solution is mixed evenly, accelerate (700r / min) stirring and heat up to the solution boiling , when the solution evaporates to about 1 / 3 of the volume of the original solution, lower the heating temperature to 88°C and continue stirring until the solution becomes a colloid;
[0033] (3) Transfer the obtained colloid to a quartz boat, and then put it into a muffle furnace for high-temperature calcination. The calcination temperature is 700 ° C, and the reaction time is 3 hours. After the reaction, the pr...
Embodiment 2
[0035] The preparation method of the perovskite type lanthanum composite oxide nanotube of the present embodiment, the steps are as follows:
[0036] (1) Mix and stir 0.866g (2mmol) of lanthanum nitrate hexahydrate, 0.582g (2mmol) of nickel nitrate hexahydrate and N,N-dimethylformamide (DMF) (50mL) for 1 hour to obtain a mixed system;
[0037] (2) Add 0.9 g of polyvinylpyrrolidone K-30 to the mixed system obtained in step (1) under low-speed magnetic stirring. After the solution is evenly mixed, speed up the stirring and heat up to the boiling point of the solution until the solution evaporates to 1% of the volume of the original solution. When / 3 is about, reduce the heating temperature to 92°C and keep stirring until the solution becomes a colloid;
[0038] (3) Transfer the obtained colloid to a quartz boat, and then put it into a muffle furnace for high-temperature calcination. The calcination temperature is 700°C, and the reaction time is 2h. After the reaction, the produc...
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