Method for preparing core-shell structure metal oxide and core-shell structure metal oxide
A core-shell structure, oxide technology, applied in metal/metal oxide/metal hydroxide catalyst, oxide/hydroxide preparation, nickel oxide/nickel hydroxide, etc., can solve the core-shell structure metal oxide Problems such as morphology, size inhomogeneity, large-scale production limitations, and difficulty in controlling the morphology of the core-shell structure
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[0045] In the present invention, the preparation method of the organic carbon source aqueous solution preferably includes:
[0046] Stirring and mixing the organic carbon source and water to obtain an aqueous solution of the organic carbon source.
[0047] In the present invention, the mass ratio of the organic carbon source to water in the organic carbon source aqueous solution is preferably 2-4g: 20-100mL, more preferably 2-4g: 20-50mL.
[0048] In the present invention, the temperature of the hydrothermal reaction is preferably 160-190°C, more preferably 170-180°C; the time of the hydrothermal reaction is preferably 4-24h, more preferably 6-20h, and even more preferably 10~15h. During the hydrothermal reaction process, the organic carbon source in the organic carbon source aqueous solution is carbonized to form a black solid.
[0049] After the hydrothermal reaction, the present invention preferably cools the obtained hydrothermal reaction liquid. In the present inventio...
Embodiment 1
[0070] Dissolve 2g of glucose in 20mL of deionized water to form a homogeneous solution, then transfer the mixed solution to a 40mL reaction kettle, move it to a constant temperature box and raise the temperature to 180°C, keep it for 6h, cool naturally to room temperature after the reaction, and centrifuge to obtain carbon spheres. Add the resulting carbon sphere template to 20wt% HNO 3 solution, followed by stirring, centrifugation, and drying to obtain the acidified carbon sphere template, and 1.204g of Ni(NO 3 ) 2 4H 2 O was dissolved in 20 mL of absolute ethanol, 1.2 g of acidified carbon spheres were added to the mixture, and the prepared mixed solution was continuously ultrasonicated for 1 h at a power of 90 W, so that the carbon spheres were evenly dispersed, and then left to stand at room temperature for 12 h; After several times of centrifugation, it was washed three times with deionized water and three times with absolute ethanol, and finally moved into a blast dr...
Embodiment 2
[0076] Dissolve 2g of glucose in 20mL of deionized water to form a uniform solution, then transfer the mixed solution to a 40mL reaction kettle, move it to a constant temperature box and raise the temperature to 160°C, and keep it for 6h. After the reaction, naturally cool to room temperature and centrifuge to obtain carbon spheres. Add the resulting carbon sphere template to 25wt% HNO 3 solution, followed by stirring, centrifugation, and drying to obtain an acidified carbon sphere template, and 1.203g of Ni(NO 3 ) 2 ·6H 2 O and 2.408g of Co(NO 3 )2 4H 2 O was dissolved in 20 mL of absolute ethanol, 1.2 g of acidified carbon spheres were added to the mixture, and the prepared mixed solution was continuously ultrasonicated for 1 h at a power of 80 W, so that the carbon spheres were evenly dispersed, and then left to stand at room temperature for 12 h; After several times of centrifugation, it was washed three times with deionized water and three times with absolute ethanol,...
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Abstract
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