Metal oxide/carbon or metal oxide/metal/carbon one-dimensional nanometer composite material and preparation method thereof
A nano-composite material and metal technology, which is applied in the field of composite material preparation, can solve the problems of difficult to control the structure of carbon composite materials, uneven loading of sputtered oxides, high price, etc., and achieves high yield, low cost and uniform dispersion. Effect
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Embodiment 1
[0022] 1. Prepare sodium salicylate and Zn(NO) separately 3 ) 2 aqueous solution, Zn 2+ The concentration of sodium salicylate is 0.1M, the concentration of sodium salicylate is 0.1M, sodium salicylate and Zn(NO 3 ) 2 The molar ratio of the two solutions was 2, then the two solutions were added to the four-necked flask at the same time, the pH value was adjusted to 6.8 with 0.5mol / L sodium hydroxide solution, the reaction temperature was kept at 60°C, crystallized for 24h, and naturally cooled to room temperature, Centrifugal separation, washed with deionized water until neutral, and dried at constant temperature to obtain a one-dimensional layered zinc hydroxide nanorod precursor;
[0023] 2. The precursor prepared in step 1 is calcined in an air atmosphere at 500° C. for 4 h to obtain a ZnO / C one-dimensional nanocomposite material. The particle size of zinc oxide is 2-50 nm and is uniformly embedded in the carbon structure.
Embodiment 2
[0025] 1. Prepare sodium salicylate, Zn(NO) separately 3 ) 2 and Co(NO 3 ) 2 The aqueous solution, the total concentration of zinc nitrate and cobalt nitrate is 0.1M, Zn 2+ :Co 2+ The molar ratio is 1:1; the concentration of sodium salicylate is 0.2M, the ratio of the sum of the moles of sodium salicylate and nitrate is 2, the volume of sodium salicylate solution is 150ml, and then the two solutions are added to four ports at the same time. In the bottle, adjust the pH to 6.8 with 0.5mol / L sodium hydroxide solution, keep the reaction temperature at 80°C, crystallize for 24h, naturally cool to room temperature, centrifuge, wash with deionized water until neutral, and dry at constant temperature , to obtain a one-dimensional layered zinc-cobalt hydroxide nanorod precursor;
[0026] a. The ZnO / Co / C one-dimensional nanocomposite was obtained by calcining the prepared precursor under a hydrogen atmosphere at 500 °C for 4 h. The particle sizes of ZnO and Co were both 2-50 nm an...
Embodiment 3
[0029] 1. Prepare sodium salicylate, Zn(NO) separately 3 ) 2 and AgNO 3 150ml of each aqueous solution, the total concentration of zinc nitrate and silver nitrate is 0.1M, Zn 2+ : Ag + The molar ratio is 0.95:0.05; the concentration of sodium salicylate is 0.2M, then the two solutions are added into the four-necked flask at the same time, the pH value is adjusted to 6.7 with 0.5mol / L sodium hydroxide solution, and the reaction temperature is kept at 80 ℃, crystallized for 24 h, naturally cooled to room temperature, centrifuged, washed with deionized water until neutral, and dried at constant temperature to obtain a one-dimensional layered zinc-silver hydroxide nanorod precursor;
[0030] 2. The prepared precursor was calcined under nitrogen atmosphere at 500℃ for 4h to obtain ZnO / Ag / C one-dimensional nanocomposite material. The particle size of ZnO and Ag were both 2-50nm, and they were uniformly embedded in the carbon structure.
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