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A kind of preparation method and application of high bonding degree nanometer WC-based binary composite material

A composite material and nanotechnology, which is applied in nanotechnology, fuel cells, structural parts, etc., can solve the problems that have not been seen, and achieve the effects of simple steps, simple and easy preparation process, and enhanced dispersibility.

Active Publication Date: 2020-08-21
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] So far, there has never been a report on the preparation of this composite material by a similar simultaneous method

Method used

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  • A kind of preparation method and application of high bonding degree nanometer WC-based binary composite material
  • A kind of preparation method and application of high bonding degree nanometer WC-based binary composite material
  • A kind of preparation method and application of high bonding degree nanometer WC-based binary composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Using sodium tungstate as the tungsten source, add sodium tungstate and 17.7mM stannous chloride solution into 15mL deionized water according to the W / Sn mass ratio of 4:1 to prepare sodium tungstate and stannous chloride The total mass fraction of the solution was 4.5 wt%, and then 0.375g oxalic acid was added. The obtained mixed solution was transferred to a hydrothermal reaction kettle after ultrasonic treatment to carry out hydrothermal reaction at 200° C. for 12 h. Calcinate the product obtained after hydrothermal treatment at 550°C for 2 hours to obtain the calcined powder material, mix it with high-purity white tin powder (purity 99.99%) and then press it into tablets (the mass fraction of tin powder is 15%) , and calcined again at 550° C. for 2 h under a nitrogen atmosphere to obtain a bulk sintered material. Take part of the bulk sintered material and put it into a tube furnace in CO:H 2 (Volume ratio is 5:1) WC-Sn samples were obtained after heating at 5...

Embodiment 2

[0051] Similar to the process of Example 1, but the W / Sn mass ratio is 4:0.5, it is prepared into a solution in which the total mass fraction of sodium tungstate and stannous chloride is 3.8wt%, and 0.4g oxalic acid is added, and the rest of the steps are the same to obtain PtSn / WC composites. The composite material is a loose sphere with a diameter of about 2 μm, and the sphere is composed of highly dispersed tungsten carbide-platinum tin composite particles with an average particle diameter of about 50 nm.

Embodiment 3

[0053] Similar to the process of Example 1, but the W / Sn mass ratio is 4:0.25, it is prepared into a solution with a total mass fraction of sodium tungstate and stannous chloride of 3.5wt%, and 0.3g of oxalic acid is added, and the rest of the steps are the same to obtain PtSn / WC Composite.

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Abstract

The invention relates to a preparation method of a high-binding nanometer WC-base binary composite material and application thereof. The preparation method includes the following steps of: 1. adding atungsten source, a stannous chloride solution and oxalic acid into deionized water, and uniformly stirring to obtain a mixed solution; 2. carrying out hydrothermal reaction in the mixed solution to obtain precursor particles; 3. calcining the precursor particles to obtain a calcined powder material; 4. uniformly mixing the calcined powder material with high purity white tin powder, tableting andthen calcining the mixture again under a nitrogen atmosphere to obtain blocky sintered materials; 5. carrying out carbonization to the blocky sintered materials in a mixed atmosphere of H2 and CO by adopting a programmed temperature-rising gas-solid reaction method to obtain a WC-Sn composite material; 6. slowly dissolving and activating the WC-Sn composite material in hydrochloric acid; 7. addinga chloroplatinic acid solution into the WC-Sn composite material to carry out platinum carrier replacement, so as to obtain the PtSn / WC composite material. The PtSn / WC composite material can be applied to a methanol fuel cell as an electrocatalyst, and the catalytic efficiency and the service life of the catalyst can be significantly improved.

Description

[0001] (1) Technical field [0002] The invention relates to a preparation method of a high-combination nanometer WC-based binary composite material and its application as an electrocatalyst in a methanol fuel cell. [0003] (2) Background technology [0004] In recent years, tungsten carbide (WC) has attracted much attention due to its many application fields, especially in the field of catalysis. It has been extensively studied as a non-precious metal catalytic material support with excellent performance. For example, WC is often introduced as a carrier in the preparation process of anode platinum-based catalysts for direct alcohol fuel cells, because WC is a special material with high hardness, corrosion resistance and strong stability, and has a similar outer electronic structure to platinum, thus showing Platinum-like catalytic performance. Therefore, the performance of the composite material combined with WC and Pt has been greatly improved under the synergistic catalysi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/92B82Y40/00
CPCB82Y40/00H01M4/8647H01M4/88H01M4/921H01M4/925H01M8/1011Y02E60/50
Inventor 马淳安陈赵扬段隆发
Owner ZHEJIANG UNIV OF TECH