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Carbon-supported platinum alloy powder and preparation method thereof

A technology of alloy powder and carbon-supported platinum, which is applied in nanotechnology for materials and surface science, structural parts, electrical components, etc., can solve problems such as complex procedures, long preparation time, and inapplicability of multi-component platinum alloy catalysts. The effect of broad application prospects and huge market demand

Inactive Publication Date: 2019-08-09
SINO PLATINUM METALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can produce a complete core-shell catalyst, the preparation takes a long time and the process is complicated, and it is not suitable for the preparation of multi-component platinum alloy catalysts with metals with similar potentials.

Method used

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  • Carbon-supported platinum alloy powder and preparation method thereof
  • Carbon-supported platinum alloy powder and preparation method thereof
  • Carbon-supported platinum alloy powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The carbon-supported platinum alloy powder of the present invention is prepared through the following steps:

[0027] (1) Liquid-phase precursor preparation process: Dissolve ammonium chloroplatinate, cobalt oxalate, nickel chloride, and ammonium chlororuthenate in water at an atomic ratio of Pt:Co:Ni:Ru=3:1:1:1 , add commercial XC 72 as a carrier, continue to stir and mix thoroughly and perform ultrasonic treatment to obtain a mixture of carbon black and precursor solution.

[0028] (2) Atomization drying process: using the atomization drying method, the control liquid flow rate is 8.0ml / min, the atomization pressure is 0.5MPa, the inlet temperature is 180°C, and the hot air flow rate is 10.0L / min. Metal salt spherical particles with a particle size of about 1-4 μm;

[0029] (3) Powder reduction calcination process: calcining the carbon-supported precursor powder at high temperature in a hydrogen atmosphere to obtain spherical carbon-supported platinum alloy powder. ...

Embodiment 2

[0031] The difference from Example 1 is that the carbon black has been pretreated: add an acetone solution with 2 times the carbon volume to a certain amount of XC-72 carbon powder, stir at room temperature for 3h, filter and wash with secondary water, and then use Vacuum drying at 50°C; add the dried sample to an appropriate amount of 10% HNO 3 and 30%H 2 o 2 Mixed solution (volume ratio HNO 3 :H 2 o 2 =2:1) ​​Reflux at 60°C for 5h, filter and wash with secondary water until neutral, then dry in vacuum at 50°C; grind the dried carbon material sample to obtain a modified carbon support.

Embodiment 3

[0033] The difference from Example 2 is that in the reduction calcination process: the carbon-supported precursor powder is 2 The atmosphere was raised from room temperature to 410°C, and then 2 At 410°C in air for 1h, then in N 2 The atmosphere is cooled with the furnace, and the entire calcination process is carried out under the protection of the atmosphere.

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Abstract

The invention discloses carbon-supported platinum alloy powder and a preparation method thereof. Prepared carbon-supported platinum cobalt nickel niobium quaternary alloy catalyst powder is spherical,the particle diameter is 1 to 4 micrometers, nano-alloy particles supported on carbon black are spherical, the particle diameter is 2 to 5 nanometers, the loading amount of Pt is larger than 45%, andthe atomic ratio of Pt to other metals is 3:1. According to the invention, with a metallic water-soluble salt and industrial Vulcan XC-72 carbon black as raw materials, the carbon-supported platinumalloy powder is obtained through liquid phase impregnation combined with atomization drying and calcination process, the specific preparation method comprises the steps of (1) carbon black pretreatment, (2) atomization drying and (3) powder reduction calcination. The mass specific activity of methanol catalytic of the prepared carbon-supported platinum alloy powder is 314 mA / mgpt. The powder can be used as a catalyst for a proton exchange membrane fuel cell and a direct methanol fuel cell and has a large market demand and a broad application prospect.

Description

technical field [0001] The invention belongs to the technical field of powder preparation, and in particular relates to a preparation method of carbon-supported platinum alloy powder. Background technique [0002] Platinum (Pt) and Pt-based materials are considered to be the most effective electrocatalysts for the cathode oxygen reduction reaction (ORR) of proton exchange membrane fuel cells (PEMFC). The preparation of PEMFC is an important link in determining the large-scale application of PEMFC. [0003] At present, the most widely used anode and cathode in PEMFC are still Pt catalysts, but the high cost, low performance and poor stability of Pt hinder the commercial application of PEMFC. Due to the superior electrocatalytic performance and stability of Pt alloys compared with pure Pt, Pt alloy catalysts are considered to be the second generation of fuel cell catalysts after pure platinum. The size, crystallinity, dispersion, and carbon support properties of catalyst par...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M4/88B82Y30/00
CPCB82Y30/00H01M4/8825H01M4/921H01M4/926Y02E60/50
Inventor 姚陈思琦易伟李继刚陈家林
Owner SINO PLATINUM METALS CO LTD
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