A kind of three-dimensional cobalt/carbon nanocomposite catalytic material and its preparation method and application
A carbon nanocomposite and catalytic material technology, applied in the field of three-dimensional cobalt/carbon nanocomposite catalytic materials and its preparation, can solve the problems of slow reduction reaction rate, scarce resources, weak resistance to methanol, etc., and achieve easy industrial production and preparation process Simple, adsorption-promoting effect
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[0030] The preparation process of Co / CoO@N-C catalyst is as follows:
[0031] (1) Preparation of three-dimensional cobalt-based in-situ templates: Take 0.111 g of ammonium fluoride, 0.291 g of cobalt chloride, and 0.3 g of urea in 25-45 ml of deionized water and stir for 30-60 minutes, then place them at 110-130 ° C Keep warm at high temperature for 250-350 minutes, wait for the temperature of the reaction kettle to cool down to room temperature, take out the pink precipitate, centrifuge, wash with water and alcohol for 5-8 times, and finally dry at 50-80°C for 6-8 hours (the The dried powder is heated to 350-450°C at a rate of 3-5°C per minute (, kept for 1-3 hours, and then naturally cooled to room temperature to obtain the three-dimensional cobalt-based in-situ template;
[0032] (2) Preparation of carbon-coated three-dimensional precursor: take 0.1-1 g (preferably 0.2-0.8 g) of the powder obtained in step 1 in 3-100 ml of glucose solution, and keep it warm at 170-190 ° C f...
Embodiment 1
[0040] Take 0.111 g of ammonium fluoride, 0.291 g of cobalt chloride and 0.3 g of urea in 30 ml of deionized water and stir for 40 minutes, then keep it at 120°C for 270 minutes, wait for the reaction kettle to cool down to room temperature, and take out the pink precipitate , centrifuged, washed with water and alcohol for 6 times, and finally dried at 60°C for 7 hours. The dried powder was heated to 400°C at a rate of 4°C per minute, kept for 2 hours, and then naturally cooled to room temperature. A powdery three-dimensional cobalt-based in situ template was obtained, which is a hollow sea urchin-like Co 3 o 4 ; 0.5 g of the obtained three-dimensional cobalt-based in-situ template powder was placed in 40 ml of glucose solution, kept at 180°C for 8 hours, cooled naturally to room temperature, centrifuged, washed with water and ethanol for 6 times, and then dried at 70°C After 10 hours, the carbon-coated three-dimensional precursor was obtained; the obtained carbon-coated thre...
Embodiment 2
[0042] Take 2.22 grams of ammonium fluoride, 5.82 grams of cobalt chloride and 6 grams of urea in 600 milliliters of deionized water and stir for 40 minutes, then keep warm at 120°C for 270 minutes, wait for the reaction kettle to cool down to room temperature, and take out the pink precipitate , centrifuged, washed with water and alcohol for 6 times, and finally dried at 60°C for 7 hours. The dried powder was heated to 400°C at a rate of 4°C per minute, kept for 2 hours, and then naturally cooled to room temperature. Obtain three-dimensional cobalt-based in-situ template powder; put 10 grams of the obtained three-dimensional cobalt-based in-situ template powder in 800 ml of glucose solution, keep it warm at 180°C for 8 hours, naturally cool to room temperature, centrifuge, wash with water and ethanol for 6 After drying for 10 hours at a temperature of 70°C, a carbon-encapsulated three-dimensional precursor was obtained; the obtained carbon-encapsulated three-dimensional precur...
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