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

Active Publication Date: 2014-01-15
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, there has never been a report on the simultaneous preparation of PtWC composites with a spherical core-shell structure

Method used

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  • Tungsten carbide/platinum composite material with core-shell structure as well as preparation and application thereof
  • Tungsten carbide/platinum composite material with core-shell structure as well as preparation and application thereof
  • Tungsten carbide/platinum composite material with core-shell structure as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a tungsten carbide / platinum composite material with a core-shell structure as well as preparation and application thereof. The granule of the tungsten carbide / platinum composite material with the core-shell structure takes tungsten carbide as a core, and the platinum is coated and grown on the surface of the tungsten carbide; the granule diameter of the tungsten carbide / platinum composite material with the core-shell structure is 50-1500 nanometers. The preparation method comprises the following steps of firstly preparing a tungsten carbide / copper composite material with the core-shell structure through spray drying-reduction carbonization; then reducing to obtain Cu in a carbonization process through Pt displacement so as to obtain the tungsten carbide / platinum composite material with the core-shell structure. The preparation method disclosed by the invention has the advantages of simple integral preparation step and low cost. The invention provides application of the tungsten carbide / platinum composite material with the core-shell structure as an electrocatalyst in a methanol fuel cell. A result indicates that the tungsten carbide / platinum composite material with the core-shell structure can obviously increase the catalytic conversion efficiency and prolong the service life of a catalyst.

Description

(1) Technical field [0001] The invention relates to a tungsten carbide / platinum composite material (PtWC) with a core-shell structure and its preparation and application, especially its application as an electrocatalyst in a methanol fuel cell. (2) Background technology [0002] Composite materials are materials with new properties macroscopically composed of two or more materials with different properties through physical or chemical methods. Various materials learn from each other in terms of performance and produce synergistic effects, so that the comprehensive performance of the composite material is better than that of the original constituent materials to meet various requirements. Tungsten carbide (WC) is a metal compound. According to literature reports (see literature: Science, 1973, 181:547), the electronic layer on the surface of WC is similar to that of Pt, and has Pt-like catalytic activity in certain reactions. WC not only has the characteristics of replacing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22H01M4/92
CPCY02E60/50
Inventor 马淳安陈赵扬褚有群施梅勤
Owner ZHEJIANG UNIV OF TECH
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