Preparation method and application of graphene quantum dot-stabilized noble metal nanoparticles
A graphene quantum dot, nanoparticle technology, applied in non-metallic elements, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems that have not yet occurred
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Embodiment 1
[0064] The preparation scheme adopted in the present invention includes the following steps
[0065] Step 1: Take 50 mg of dextran, put it in a 100 mL round-bottomed flask, add 50 mL of deionized water, stir to dissolve, pour it into the reaction kettle, and put it in an oven at 180°C for 8 hours;
[0066] Step 2: Take 4 mL of the graphene quantum dot solution in step 1, add a stirrer and stir well;
[0067] Step 3: Place the 2.25×10 -3 mmol of platinum tetrachloride was added to deionized water to prepare a 0.5ml solution;
[0068] Step 4: The solution obtained in step 3 was added to the solution in step 2, and the solution was fully stirred for 10 min.
[0069] Step 5: Take 2.25×10 -2 mmol ammonia borane was added to deionized water to prepare a 0.5ml solution;
[0070] Step 6: Add the solution obtained in step 5 to the solution in step 4, and stir well for 2h.
[0071] Step 7: After the reaction is completed, the catalyst is stored at 3-5° C., and a noble metal nanopar...
Embodiment 2
[0076] The platinum nanoparticle catalyst prepared according to Example 1 was used to catalyze ammonia borane (NH 3 BH 3 ) The concrete steps of hydrolysis hydrogen production reaction are as follows:
[0077]
[0078] Step 1: Dissolve an appropriate amount of ammonia borane in deionized water to make a solution of 1 mmol / ml;
[0079] Step 2: will contain 2 x 10 -3 The graphene quantum dot-stabilized platinum nanoparticle catalyst solution of mmol platinum nanoparticles is placed in a reactor, a stirrer is added, the reactor is sealed, and the stirrer is turned on to stir;
[0080] Step 3: Use a syringe to suck 0.5ml of the ammonia borane solution in Step 1, quickly inject it into the reactor of Step 2, and start timing at the same time;
[0081] Step 4: Record the hydrogen volume at the corresponding time every 30s.
[0082] Figure 4 It is a relationship diagram between the reaction time of the catalyst prepared by the invention to catalyze the hydrolysis of ammonia ...
Embodiment 3
[0084] The platinum nanoparticle catalyst prepared according to Example 1 catalyzed sodium borohydride (NaBH 4 ) the step of hydrolysis hydrogen production reaction is as follows:
[0085]
[0086] Step 1: Dissolve an appropriate amount of sodium hydroxide in deionized water to prepare a 0.1 mmol / ml solution;
[0087] Step 2: Weigh 1 mmol of sodium borohydride and dissolve it in 1 ml of the aqueous sodium hydroxide solution in step 1;
[0088] Step 3: Will Contain 8×10 -3 The platinum nanoparticle catalyst solution of mmol platinum nanoparticles is placed in the reactor, a stirring bar is added, the reactor is sealed, and the stirrer is turned on to stir;
[0089] Step 4: Use a syringe to suck 1ml of sodium borohydride solution in step 2, quickly inject it into the reactor of step 3, and start timing at the same time;
[0090] Step 5: Record the volume of hydrogen gas at the corresponding time every 30s.
[0091] Figure 5 It is the relationship diagram of the reaction...
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