Platinum-supported C-shaped cerium oxide nanofiber as well as preparation method and application thereof
A technology of nanofibers and composite nanofibers, which is applied in the field of C-shaped cerium oxide nanofibers loaded with platinum and its preparation. It can solve the problems of limited application of platinum nanoparticles, easy agglomeration of Pt nanocrystals, loss of deactivation, etc., reaching the scope of use Wide range, cheap raw materials, and the effect of increasing surface energy
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Embodiment 1
[0023] Preparation of ~3 nm Pt particles
[0024] a) First, preheat 4 mL of ethylene glycol at 110 °C for 30 min.
[0025] b) Dissolve PVP (Mw≈55000) in 2 mL of ethylene glycol to a concentration of 11.3 mg / mL.
[0026] c) Dissolve chloroplatinic acid in 2 mL of ethylene glycol to a concentration of 8.3 mg / mL.
[0027] d) Simultaneously inject 0.5 mL of each of the two solutions in steps b and c into the ethylene glycol in step a at an injection rate of 0.67 mL / min. The reaction was continued at 110 °C for 0.5–1 h, and then cooled to room temperature naturally. The resulting Pt suspension was a clear gray color and the product was not washed by centrifugation. see figure 1 .
Embodiment 2
[0029] Weigh 0.60 g of PVP (molecular weight: 1300000) and dissolve them in 3.0 mL of absolute ethanol, stir magnetically at room temperature for 12 hours to obtain a uniform and transparent solution. Add 3.0 mL of acetone and 0.30 g of cerium acetylacetonate to the above solution in turn, stir at room temperature to dissolve completely, and obtain a yellow-brown precursor solution. The applied voltage here is 15.0 kV, the distance between the metal needle and the fiber collector is 13.0 cm, the flow rate is 0.50 mL / h, and the grounded tinfoil is used as the receiver to collect the fibers.
[0030] Ce(acac) peeled off the surface of tin foil 3 / PVP nanofibers were carefully transferred to a crucible and calcined in an air atmosphere at a temperature of 500 °C for 2 h with a heating rate of 4.2 °C / min. During the heating process, PVP was decomposed to obtain C-shaped cerium oxide nanofibers. see figure 2 .
Embodiment 3
[0032] The C-shaped cerium oxide nanofibers prepared in Example 2 were dispersed in ethanol to obtain a suspension with a concentration of 2.5 mg / mL. And 0.2 mL of the Pt suspension prepared in Example 1 was added to the above suspension, and stirred gently at room temperature for 2 h. The obtained product was centrifuged and washed 4 times with alcohol. When centrifuging, use 5000-8000 rpm, and centrifuge for 2-3 minutes each time. The average particle size of Pt is 2.37 nm, see image 3 .
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