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Method for preparing graphene-supported palladium-iridium nano-particle catalysts and formic acid oxidation electrocatalysis application of graphene-supported palladium-iridium nano-particle catalysts

A nanoparticle, graphene technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as difficulty in removal, environmental pollution and safety hazards, and inability to fully exert catalytic performance, and achieve operational Simple, high practical value, wide application range and promising effect

Inactive Publication Date: 2017-09-19
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for preparing graphene-supported palladium-iridium nano-particle catalysts and formic acid oxidation electrocatalysis application of graphene-supported palladium-iridium nano-particle catalysts
  • Method for preparing graphene-supported palladium-iridium nano-particle catalysts and formic acid oxidation electrocatalysis application of graphene-supported palladium-iridium nano-particle catalysts
  • Method for preparing graphene-supported palladium-iridium nano-particle catalysts and formic acid oxidation electrocatalysis application of graphene-supported palladium-iridium nano-particle catalysts

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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., and the ultrasonic power is 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 field of technologies for preparing supported catalysts, and particularly relates to a method for preparing graphene-supported palladium-iridium nano-particle catalysts and formic acid oxidation electrocatalysis application of the graphene-supported palladium-iridium nano-particle catalysts. The method includes steps of 1), adding graphene into formic acid solution and ultrasonically uniformly mixing the graphene and the formic acid solution with each other; 2), uniformly dispersing mixed solution prepared from chloroiridic acid and sodium chloropalladate under ultrasonic conditions; 3), heating mixed solution obtained at the step 2); 4), quickly injecting mixed solution obtained at the step 3) into graphene and formic acid mixed solution obtained at the step 1) and carrying out ultrasonic treatment under sealed conditions; 5), cleaning obtained products and then drying the products. The method and the formic acid oxidation electrocatalysis application have the advantages that the graphene-supported palladium-iridium nano-particle catalysts have extremely large electrochemically active specific surface areas and are extremely high in formic acid oxidation catalytic activity, high-toxicity materials are omitted, and the method is easy and convenient to implement, high in repeatability and suitable for mass 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 Applications(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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