Tungsten carbide/platinum composite material with core-shell structure as well as preparation and application thereof
A technology of composite materials and core-shell structure, applied in structural parts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as PtWC composite materials that have not been reported, and achieve cost reduction, good thermal stability, catalytic highly active effect
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Embodiment 1
[0034] Mix ammonium metatungstate and copper nitrate at a mass ratio of 1:0.6, and add deionized water to prepare a 22wt% solution. In the present invention, the mixed solution of ammonium metatungstate and copper nitrate is preferably dispersed by ultrasonic treatment for 3 minutes, then spray-dried, and then dried by dual-flow spray drying (inlet temperature 210°C), and the obtained solid particles are Reduction carbonization, the carbonization atmosphere is: CO and H with a volume ratio of 1:2 2 The mixed atmosphere was raised to 800° C. for 4 hours by using the temperature programmed-gas-solid reaction method at a stepwise programmed temperature rise rate of 6° C. / min. The obtained particles are immersed in 5mmol / L chloroplatinic acid solution at a temperature of 50°C. The chloroplatinic acid solution is fed according to the mass of Pt in the solution being 10% of the mass of the prepared PtWC. After maintaining for 6 hours, filter After washing and drying, a PtWC sample ...
Embodiment 2
[0037] The process is similar to that of Example 1, but ammonium metatungstate and copper nitrate are mixed at a mass ratio of 1:0.5, and the rest of the steps are the same to obtain a PtWC sample. Figure 6 SEM image of the as-prepared PtWC material. From Figure 6 It can be seen that the sample particles are nanoparticles.
Embodiment 3
[0039] Similar to the process of Example 1, the ultrasonic dispersion time is 1 minute, and the rest of the steps are the same to obtain a PtWC sample, and the topography of the sample is similar to that of Example 1.
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