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Preparation method of graphene supported palladium iridium nanoparticle catalyst and its electrocatalytic application in formic acid oxidation

A nanoparticle and graphene technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as insufficient catalytic performance, difficult removal, environmental pollution and safety hazards, etc. Application scope and prospect, easy operation, high practical value effect

Inactive Publication Date: 2019-06-21
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the surface active agent is easily coated on the surface of the prepared metal nanoparticles and is difficult to remove, thus covering part of the active sites, the catalytic performance cannot be fully exerted; and the use of highly toxic reducing agents is likely to cause environmental pollution and pose a safety hazard.

Method used

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  • Preparation method of graphene supported palladium iridium nanoparticle catalyst and its electrocatalytic application in formic acid oxidation
  • Preparation method of graphene supported palladium iridium nanoparticle catalyst and its electrocatalytic application in formic acid oxidation
  • Preparation method of graphene supported palladium iridium nanoparticle catalyst and its electrocatalytic application in formic acid oxidation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation method of the palladium iridium / graphene high-performance formic acid oxidation catalyst of the present embodiment may further comprise the steps:

[0039] 1) Add 15mg of graphene to 8mL of formic acid solution and mix uniformly by ultrasonic at 90°C, the ultrasonic power is 300W.

[0040] 2) 0.286mL chloroiridic acid (7mg·mL -1 Ir ) and 0.221mL sodium chloropalladate (20mg·mL -1 Pd ) the mixed solution prepared by ultrasonication for 1h, the ultrasonic power is 300W.

[0041] 3) Heat the solution homogeneously mixed in step 2) to 90°C.

[0042] 4) Rapidly inject the mixed solution in step 3) into the mixed solution of graphene and formic acid in step 1), and perform ultrasonic treatment for 5 hours under sealed conditions at 90° C., with an ultrasonic power of 300W.

[0043] 5) The product obtained by the reaction is washed and dried at 60° C. for 10 h, which is a palladium-iridium / graphene high-performance formic acid oxidation catalyst.

[0044]...

Embodiment 2

[0049] The preparation method of the palladium iridium / graphene high-performance formic acid oxidation catalyst of the present embodiment may further comprise the steps:

[0050] 1) Add 15 mg of graphene to 5 mL of formic acid solution and mix uniformly by ultrasonic at 80° C., and the ultrasonic power is 300 W.

[0051] 2) 0.286mL chloroiridic acid (7mg·mL -1 Ir ) and 0.221mL sodium chloropalladate (20mg·mL -1 Pd ) the mixed solution prepared by ultrasonication for 2h, the ultrasonic power is 500W.

[0052] 3) Heat the solution homogeneously mixed in step 2) to 80°C.

[0053] 4) Rapidly inject the mixed solution in step 3) into the mixed solution of graphene and formic acid in step 1), and perform ultrasonic treatment for 8 hours under sealed conditions at 80° C., with an ultrasonic power of 500 W.

[0054] 5) The product obtained by the reaction is washed and dried at 80° C. for 16 hours, which is a palladium-iridium / graphene high-performance formic acid oxidation catal...

Embodiment 3

[0060] The preparation method of the palladium iridium / graphene formic acid oxidation catalyst of the present embodiment may further comprise the steps:

[0061] 1) Add 15 mg of graphene to 8 mL of sodium borohydride aqueous solution (2 mg / mL) and mix uniformly by ultrasonic at 90° C. with an ultrasonic power of 300 W.

[0062] 2) 0.286mL chloroiridic acid (7mg·mL -1 Ir ) and 0.221mL sodium chloropalladate (20mg·mL -1 Pd ) the mixed solution prepared by ultrasonication for 1h, the ultrasonic power is 300W.

[0063] 3) Heat the solution homogeneously mixed in step 2) to 90°C.

[0064] 4) Rapidly inject the mixed solution in step 3) into the mixed solution of graphene and sodium borohydride in step 1), and perform ultrasonic treatment for 5 hours under sealed conditions at 90° C., and the ultrasonic power is 300W.

[0065] 5) The product obtained by the reaction is washed and dried at 60° C. for 10 h, which is the palladium iridium / graphene-1 formic acid oxidation catalyst....

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Abstract

The invention belongs to the technical field of supported catalyst preparation, and specifically relates to a preparation method of a graphene-supported palladium-iridium nanoparticle catalyst and its electrocatalytic application in formic acid oxidation. The method includes the following steps: 1) Add graphene to a formic acid solution and mix it evenly under ultrasonic; 2) Disperse the mixed solution prepared from chloroiridic acid and sodium chloropalladate evenly under ultrasonic conditions; 3) Add the mixed solution obtained in step 2) Heating; 4) Quickly inject the mixed solution obtained in step 3) into the mixed solution of graphene and formic acid in step 1), and perform ultrasonic treatment under sealed conditions; 5) The obtained product is washed and dried. The catalyst has high electrochemical activity specific surface area and formic acid oxidation catalytic activity, and the method does not involve the use of highly toxic materials, is easy to operate, has high repeatability, and is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of preparation of supported catalysts, and in particular relates to a method for preparing a graphene-supported palladium-iridium nanoparticle catalyst and its electrocatalytic application for formic acid oxidation. Background technique [0002] Direct formic acid fuel cells using liquid formic acid as fuel have high energy conversion efficiency and are environmentally friendly, and have shown great application potential as automobile power and portable power sources. Formic acid oxidation is an essential anode catalytic reaction for direct formic acid fuel cells. At present, the commonly used palladium / carbon catalysts have insufficient catalytic activity for formic acid oxidation and cannot meet the needs of current commercialization. In order to speed up the commercialization process of direct formic acid fuel cells, it is particularly important to research and prepare high-performance formic acid oxidat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/46H01M4/92
CPCH01M4/921H01M4/926B01J23/468B01J37/343B01J35/393B01J35/394B01J35/33B01J35/613Y02E60/50
Inventor 张连营巩玉燕赵修松
Owner QINGDAO UNIV
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