A kind of activity optimization processing method of platinum nanocrystal catalyst
A treatment method, platinum nanotechnology, applied in the field of platinum nanocrystal catalyst activity optimization treatment, to achieve the effects of large active area, high oxygen reduction activity, and huge market benefits
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Embodiment 1
[0046] Preparation of platinum nanocrystals, the specific preparation process is as follows:
[0047] Reflux 2.5ml ethylene glycol for 5min, add 0.5ml2×10 -3 MAgNO 3 solution, then, add 93.8 μL 0.375M polyvinylpyrrolidone (total 3mL, polyvinylpyrrolidone / platinic acid=12:1) and 46.9 μL 0.0625MH 2 PtCl 6 .6H 2 O (a total of 1.5mL) solution (the solvent is ethylene glycol) was added to the boiling ethylene glycol every 30s within 16min, the final mixture was refluxed for 5min, the product was centrifuged at 5000 rpm for 15min, and the supernatant was Separate, add three times of acetone to the resulting precipitate, then centrifuge at 3000 rpm for 5 min, collect the precipitate, ultrasonically disperse it in 3 ml of ethanol, then add 9 ml of n-hexane and centrifuge at 3000 rpm for 5 min, and finally The precipitate was washed twice in a mixed solvent of ethanol:n-hexane=1:3. Finally, the precipitate was dispersed in 18ml of water and sonicated for 20min. The as-synthesized...
Embodiment 2
[0052] 20%H at different temperatures 2 The 20%PtNCs-CNTs obtained in -80%Ar atmosphere treatment embodiment 1: put the gained 20%PtNCs-CNTs in the quartz boat, put the quartz boat into the quartz tube, then put the quartz tube into the tube furnace, 20%H 2 Heat treatment at different temperatures from 100 °C to 800 °C for 1 h in a -80% Ar atmosphere at a rate of 10 °C / min. The obtained samples were characterized as Figure 1C , D, E, F, G, H, as shown.
[0053] Use the 20% PtNCs-CNTs sample treated in this example to prepare a sample with a Pt concentration of 1 mg / ml, measure 1 ul and drop-coat it on the surface of the glassy carbon electrode, dry it, and drop-coat 0.5 ul of 0.5% nafion solution Fix the sample and use a three-electrode system (the glassy carbon electrode modified by the prepared sample is the working electrode, Pt is the counter electrode, Hg / HgSO 4 electrode as the reference electrode), at H 2 SO 4 and H 2 o 2 The mixed solution was treated for 20mi...
Embodiment 3
[0057] Treat the 20%PtNCs-CNTs prepared in Example 1 in an Ar atmosphere at 300°C: put the resulting 20%PtNCs-CNTs in a quartz boat, put the quartz boat into the quartz tube, and then put the quartz tube into the tube furnace , heated at a rate of 10 °C / min to 300 °C for 1 h in an Ar atmosphere, and its sample characterization is as follows Figure 1I .
[0058] Use the 20% PtNCs-CNTs sample treated in this example and the 20% PtNCs-CNTs sample obtained at the same temperature in Example 2 to prepare a sample with a Pt concentration of 1 mg / ml, and take 1 ul and drop-coat it on the glassy carbon Dry the surface of the electrode, apply 0.5ul of 0.5% nafion solution to fix the sample, and use a three-electrode system (the glassy carbon electrode modified by the prepared sample is the working electrode, Pt is the counter electrode, Hg / HgSO 4 electrode as the reference electrode), at H 2 SO 4 and H 2 o 2 The mixed solution was treated for 20min, and the cyclic voltammetry sca...
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