Nanometer platinum/nickel hydroxide/multiwall carbon nanotube compound and application thereof
A technology of multi-walled carbon nanotubes and nanocomposites, applied in the field of electrochemistry, can solve problems such as limited catalytic activity, low catalytic activity, and poor selectivity, and achieve the effects of improved catalytic performance, simple preparation process, and easy operation
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[0034] The preparation method of nano-platinum / nickel hydroxide / multi-walled carbon nanotube nanocomposite material comprises the following steps:
[0035] Step 1: Dispersing multi-walled carbon nanotubes in a mixed solution of nickel nitrate and urea, heating and reacting, then cooling and standing to obtain a nickel hydroxide / multi-walled carbon nanotube nanocomposite;
[0036] Step 2: Take the nano-composite obtained in step 1 and disperse it in ethylene glycol, then add sodium chloroplatinate, adjust the pH value of the solution, reflux the oil bath for a certain period of time, wash and dry to obtain nano-platinum / nickel hydroxide / polycarbonate Walled carbon nanotube composites.
[0037] The molar ratio of nickel nitrate to urea is 1:10-60.
[0038] The volume of sodium chloroplatinate is 0.5-1.0 mL.
[0039] The reflux temperature of the oil bath in step 2 is 110-150°C.
[0040] The oil bath heating reaction time in step 1 is 0.5-3 hours, and the cooling and standing ...
Embodiment 1
[0048] Weigh 0.7269g of nickel nitrate and 3g of urea in 10mL of water respectively, then ultrasonically disperse 0.02g of multi-walled carbon nanotubes in water, then transfer the above solution to a round-bottomed flask in an oil bath of 80°C, stir and react for 2 hours, then cool down Placed overnight; after washing and drying, nickel hydroxide / multi-walled carbon nanotube composites were obtained for the next step of preparation;
[0049] Take 10 mg of the prepared nickel hydroxide / multi-walled carbon nanotube composite and ultrasonically disperse it in 20 mL of ethylene glycol solution, add 0.5 mL of sodium chloroplatinate solution and stir evenly after 1 h; then use 1.25 mol / L sodium hydroxide to dissolve the above After the pH of the solution was adjusted to 12, the oil bath was heated at 130° C., the reaction was refluxed for 3 hours, cooled naturally, washed and dried to obtain a nano-platinum / nickel hydroxide / multi-walled carbon nanotube composite.
[0050] The schem...
Embodiment 2
[0052] Firstly, 0.7269 g of nickel nitrate and 6 g of urea were weighed in 10 mL of water, and then 0.02 g of multi-walled carbon nanotubes were ultrasonically dispersed in the water. Transfer the above solution to a round-bottomed flask with an oil bath at 80°C, stir for 3 hours, then cool and stand overnight. Wash and dry to obtain a nickel hydroxide / multi-walled carbon nanotube composite for the next step of preparation.
[0053] Take 10 mg of nickel hydroxide / multi-walled carbon nanotube composite and ultrasonically disperse it in 20 mL of ethylene glycol solution, add 1 mL of sodium chloroplatinate solution and stir evenly after 1 h. After the pH of the above solution was adjusted to 13 by using 1.25mol / L sodium hydroxide, the mixture was heated in an oil bath at 150°C, and the reaction was refluxed for 3 hours, cooled naturally, washed and dried to obtain nano-platinum / nickel hydroxide / multi-walled carbon nanotube composites.
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