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Preparation method of platiniridium/carbon-electro catalyst by using microwave synthesis

A technology of electrocatalyst and microwave synthesis, which is applied in the fields of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc.

Inactive Publication Date: 2010-06-02
赵杰 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the synthesis of platinum-iridium / carbon electrocatalysts by microwave polyol method has not been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Dissolve chloroplatinic acid and chloroiridic acid in ethylene glycol respectively to prepare solutions with a concentration of 0.002mol / L. Take 50mL of the solution, add sodium acetate to make the concentration in the solution 0.006mol / L, then add 160mg XC-72 carbon to the solution, and after ultrasonic dispersion, transfer the mixture to a 250mL round-bottomed flask. In a microwave oven, install a reflux device and heat in microwave for 3 minutes. After cooling, the solid product is filtered, washed, and dried at 80°C. A platinum-iridium / XC-72 carbon catalyst was obtained (the mass fraction of the platinum-iridium alloy was 19.8%). The composition of platinum-iridium alloy is Pt 1.0 Ir 1.0 . The average particle size of platinum-iridium alloy nanoparticles observed by transmission electron microscope is 3.2nm, and the particle size distribution is 1-5nm. However, the XC-72 carbon-loaded platinum-iridium alloy nanoparticles prepared by the traditional impregnation-...

Embodiment 2

[0010] Dissolve chloroplatinic acid and chloroiridic acid in ethylene glycol respectively to prepare solutions with a concentration of 0.002mol / L. Take 50mL of this solution, add sodium acetate to make the concentration in the solution 0.006mol / L, then add 160mg carbon nanotubes to the solution, and after ultrasonic dispersion, transfer the mixture to a 250mL round bottom flask, place In the microwave oven, install a reflux device, microwave for 3 minutes, and after cooling, the solid product is filtered, washed, and dried at 80°C. A platinum-iridium / carbon nanotube catalyst was obtained (the mass fraction of the platinum-iridium alloy was 19.8%). The composition of platinum-iridium alloy is Pt 1.0 Ir 1.0 . The average particle size of platinum-iridium alloy nanoparticles observed by transmission electron microscope is 3.2nm, and the particle size distribution is 1-5nm. However, the average particle size of platinum-iridium alloy nanoparticles supported by carbon nanotubes...

Embodiment 3

[0012] Potassium chloroplatinate and chloroiridic acid were respectively dissolved in ethylene glycol to prepare a solution with a concentration of 0.002mol / L. Take 50mL of this solution, add sodium acetate to make the concentration in the solution 0.006mol / L, then add 160mg carbon nanotubes to the solution, and after ultrasonic dispersion, transfer the mixture to a 250mL round bottom flask, place In the microwave oven, install a reflux device, microwave for 3 minutes, and after cooling, the solid product is filtered, washed, and dried at 80°C. A platinum-iridium / carbon nanotube catalyst was obtained (the mass fraction of the platinum-iridium alloy was 19.8%). The composition of platinum-iridium alloy is Pt 1.0 Ir 1.0 . The average particle size of platinum-iridium alloy nanoparticles observed by transmission electron microscope is 3.3 nm, and the particle size distribution is 1-5 nm. However, the average particle size of platinum-iridium alloy nanoparticles supported by c...

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PUM

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Abstract

The invention discloses a preparation method of a platiniridium / carbon-electro catalyst by using microwave synthesis. The preparation method comprises the following steps of: evenly distributing nanometer carbon carriers in ethylene glycol solution containing both platinum metal salt and iridium metal salt at the same time, wherein the concentration of the platinum salt and the iridium salt is 0.001 to 0.01 mol / L; adding sodium acetate as a stabilizer, wherein the concentration of the sodium acetate in the resulting solution is 0.005 to 0.03 mol / L; then heating the well-distributed mixture of the nanometer carbon carriers and the metal salt ethylene glycol solution for 2 to 4 minutes by microwave radiation, and then filtering, washing and drying to obtain the platiniridium / carbon-electro catalysts. The atomic composition ratio of a platinum iridium alloy is PtxIry, wherein x is 0.1 to 1, and y is 0.1 to 1. The invention has the advantages that the nano-particles of the platinum iridium alloy, which are loaded on the surfaces of the carbon carriers, have small grain diameter averagely from 3 to 4 nm, and the grain diameter distribution is narrow, and the loading capacity of the alloy nano particles on the surface of the carbon carrier is 5% to 30%. The invention also has the advantages of high speed, simple process, high efficiency and energy saving. The platiniridium / carbon-electro catalyst is widely used in the field of electrochemical energy conversion.

Description

technical field [0001] The invention relates to a preparation method of microwave-synthesized platinum-iridium / carbon electrocatalyst, which belongs to the technical field of catalyst preparation and the technical field of electrochemical energy. Background technique [0002] Direct methanol fuel cells (DMFCs) have a wide range of applications as small mobile power sources due to their high energy density and energy conversion efficiency, as well as low operating temperature. Platinum has high catalytic activity for the electrochemical oxidation of methanol, but the strong adsorption of methanol oxidation intermediate products (CO, etc.) on the platinum surface will poison the catalyst. In order to improve the CO poisoning resistance of platinum, alloys formed by platinum and other transition metals (such as ruthenium, nickel, iridium, etc.) were used to replace pure platinum as the anode catalyst of DMFCs, which can improve the CO poisoning resistance of the catalyst. [0...

Claims

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Application Information

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IPC IPC(8): B01J23/46B01J37/34H01M4/88H01M4/90
CPCY02E60/50
Inventor 赵杰金艳仙
Owner 赵杰
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