Tungsten carbide-nickel-palladium composite material and preparation method threrof, and application of composite material in fuel cells

A composite material and tungsten carbide technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as poor stability and particle agglomeration, and achieve the effects of stable combination, high catalytic activity, and enhanced stability

Active Publication Date: 2019-04-16
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, similar to other catalysts, the particles after nanoscale (particle size reduced to nanometer level) have many problems such as agglomeration and poor stability.

Method used

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  • Tungsten carbide-nickel-palladium composite material and preparation method threrof, and application of composite material in fuel cells
  • Tungsten carbide-nickel-palladium composite material and preparation method threrof, and application of composite material in fuel cells
  • Tungsten carbide-nickel-palladium composite material and preparation method threrof, and application of composite material in fuel cells

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Effect test

Embodiment 1

[0038] Mix ammonium metatungstate and nickel sulfate at a mass ratio of 5:1.5, and add deionized water to prepare a 25wt% solution. In the present invention, the mixed solution of ammonium metatungstate and nickel sulfate is preferably mixed by magnetic stirring for 20 minutes, and then mixed with crystals at 24-28°C for 36 hours. After the precipitated crystals are precipitated and dried, they are placed in a muffle The furnace was calcined at 600°C for 2 hours, and the calcined solid particles were treated with 0.7M sodium hydroxide solution for 20 minutes. During the pore-forming process, the solution was heated to 60°C, and the dried sample was reduced to carbonization. The carbonization atmosphere was: 100 sccm of CO, Using the temperature programming-gas-solid reaction method, the temperature was raised to 300 °C at a stepwise programming rate of 5 °C / min, and then the temperature was raised to 900 °C at a stepwise programming rate of 2 °C / min for 3 hours. The obtained p...

Embodiment 2

[0040] Mix ammonium metatungstate and nickel sulfate at a mass ratio of 5:1, and add deionized water to make a 10wt% solution. The mixed solution of ammonium metatungstate and nickel sulfate prepared is magnetically stirred for 10 minutes to fully mix it, then carry out crystal blending culture at 24-28°C for 24 hours, and the precipitated crystals are precipitated and dried, then put into a muffle furnace for calcination at 500°C For 1 hour, the calcined solid particles were treated with 0.1M sodium hydroxide solution for 10 minutes. During the pore-forming process, the temperature of the solution was controlled at 20 ° C. The dried sample was reduced to carbonization. The carbonization atmosphere was: 100 sccm of CO, using a temperature program -The gas-solid reaction method raises the temperature to 700° C. at a stepwise heating rate of 1° C. / min and keeps it for 1 hour. The obtained particles are immersed in a 2mmol / L palladium chloride solution at a temperature of 20°C, a...

Embodiment 3

[0042] Mix ammonium metatungstate and nickel sulfate at a mass ratio of 5:3, add deionized water to prepare a 30wt% solution. In the present invention, the mixed solution of ammonium metatungstate and nickel sulfate is preferably mixed by magnetic stirring for 40 minutes, and then mixed with crystals at 24-28°C for 48 hours. After the precipitated crystals are precipitated and dried, they are placed in a muffle furnace. Calcined at 700°C for 3 hours, the calcined solid particles were treated with 1.5M sodium hydroxide solution for 40min for pore-forming treatment, the solution was heated to 70°C, and the dried sample was reduced to carbonization. The carbonization atmosphere was: 100 sccm of CO, using In the temperature-programmed-gas-solid reaction method, the temperature was raised to 900°C at a rate of 10°C / min and kept for 8 hours. The obtained particles are immersed in a 10mmol / L palladium chloride solution at a temperature of 100°C, and the palladium chloride solution is...

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Abstract

The invention discloses a tungsten carbide-nickel-palladium composite material and a preparation method thereof, and application of the composite material in fuel cells. The tungsten carbide-nickel-palladium composite material uses nickel-doped tungsten carbide as a base, and palladium is loaded on the surface of the base. The preparation method includes the following steps that 1, a mixed solution of ammonium metatungstate and nickel sulfate is subjected to crystallization and blended culture, and a precipitate is dried and calcined to obtain nickel compound-doped tungsten oxide; the obtain tungsten oxide is subjected to pore-forming with a sodium hydroxide solution, dried powder is reduced and carbonized in the CO atmosphere, and the temperature is reduced to obtain a tungsten carbide/nickel composite material; 2, the tungsten carbide/nickel composite material is put in a solution containing palladium compounds for a displacement reaction to obtain the tungsten carbide-nickel-palladium composite material. The preparation steps are simple and the cost is low. The invention further provides the application of the tungsten carbide-nickel-palladium composite material in the anodic reaction of the ethanol fuel cells, the catalytic activity is high, and the anti-poisoning ability is obviously enhanced.

Description

(1) Technical field [0001] The invention relates to a tungsten carbide-nickel-palladium composite material (Ni-WC / Pd) and its preparation and application, especially the application as an electrocatalyst in the anode reaction of an ethanol fuel cell. (2) Background technology [0002] Composite functional materials are composed of two or more materials with different properties, through physical or chemical methods, macroscopically composed of materials with better performance. The advantage of composite materials is that various materials can learn from each other in terms of performance and produce synergistic effects, so that the comprehensive performance of composite materials is better than that of the original constituent materials to achieve the effect of comprehensive performance improvement, so as to meet various requirements. Tungsten carbide (WC) is a metal carbide with high melting point and hardness, good thermal stability, mechanical stability and good corrosio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22H01M4/90
CPCB01J27/22B01J35/0033H01M4/9041Y02E60/50
Inventor 陈赵扬吴士忠冯晨洋褚有群
Owner ZHEJIANG UNIV OF TECH
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