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Preparation method of Pd-M nano composite catalyst loaded with reduced graphene oxide (RGO)

A nano-composite and graphene technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as low stability, complicated processing process, and easy agglomeration of catalysts, so as to achieve improved catalytic performance, simple synthesis method, and improved catalytic activity. Effect

Active Publication Date: 2018-06-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at the existing problems and deficiencies of existing catalysts in fuel cells such as easy aggregation, complex carrier pretreatment process, and low stability, and provides a method for synthesizing reduced graphene oxide loads in the next step under PEG (polyethylene glycol) protection conditions. Pd-M nanocomposite catalyst (abbreviation: PdM / RGO composite catalyst) method

Method used

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  • Preparation method of Pd-M nano composite catalyst loaded with reduced graphene oxide (RGO)
  • Preparation method of Pd-M nano composite catalyst loaded with reduced graphene oxide (RGO)
  • Preparation method of Pd-M nano composite catalyst loaded with reduced graphene oxide (RGO)

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Embodiment 1

[0038] The method for preparing the PdCo / RGO catalyst by the next step chemical reduction method under the protection condition of polyPEG, the specific steps are as follows:

[0039](1) Preparation of GO: First, 115 mL of 98% concentrated H 2 SO 4 , 5g natural scaly graphite powder and 2.5gNaNO 3 Mix and stir for 4h, place the mixed solution in an ice bath, and add 15gKMnO 4 ; Place the above mixed solution in a water bath at 35°C, stir for 0.5h; then transfer the liquid to 230mL deionized water at 98°C, let it stand for 5min, add warm water to dilute to 550mL, add 35mLH 2 o 2 remove the remaining H 2 SO 4 and KMnO 4 ; Finally, wash with 5% HCl solution and deionized water, filter with suction, and then centrifuge to obtain GO colloid, and freeze-dry the colloid to obtain GO.

[0040] (2) The preparation method of PdCo / RGO composite catalyst synthesized in the next step under PEG protection conditions: Weigh 10 mg GO prepared in (1) and ultrasonically disperse in 50 mL...

Embodiment 2

[0046] Utilize the method for preparing PdNi / RGO catalyst by next-step chemical reduction under PEG protection conditions, its specific steps are as follows:

[0047] (1) Preparation of GO: First, 115 mL of 98% concentrated H 2 SO 4 , 5g natural scaly graphite powder and 2.5gNaNO 3 Mix and stir for 4h, place the mixed solution in an ice bath, and add 15gKMnO 4 ; Place the above mixed solution in a water bath at 35°C, stir for 0.5h; then transfer the liquid to 230mL deionized water at 98°C, let it stand for 5min, add warm water to dilute to 550mL, add 35mLH 2 o 2 to remove the remaining H 2 SO 4 and KMnO 4 ; Finally, wash with 5% HCl solution and deionized water, filter with suction, and then centrifuge to obtain GO colloid, and freeze-dry the colloid to obtain GO.

[0048] (2) PEG protection conditions The preparation method of the next step to synthesize PdNi / RGO composite catalyst: Weigh 10 mg GO prepared in (1) and ultrasonically disperse in 20 mL ultrapure water for...

Embodiment 3

[0054] The method for preparing the PdCu / RGO catalyst by chemical reduction method in the next step of PEG protection condition, its concrete steps are as follows:

[0055] (1) Preparation of GO: First, 115 mL of 98% concentrated H 2 SO 4, 5g natural scaly graphite powder and 2.5gNaNO 3 Mix and stir for 4h, place the mixed solution in an ice bath, and add 15gKMnO 4 ; Place the above mixed solution in a water bath at 35°C, stir for 0.5h; then transfer the liquid to 230mL deionized water at 98°C, let it stand for 5min, add warm water to dilute to 550mL, add 35mLH 2 o 2 Restore the remaining H 2 SO 4 and KMnO 4 ; Finally, wash with 5% HCl solution and deionized water, filter with suction, and then centrifuge to obtain GO colloid, and freeze-dry the colloid to obtain GO.

[0056] (2) PEG protection conditions The preparation method of the next step to synthesize PdCu / RGO composite catalyst: Weigh 10 mg GO prepared in (1) and ultrasonically disperse in 5 mL ultrapure water f...

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Abstract

The invention discloses a preparation method of a Pd-M nano composite catalyst loaded with reduced graphene oxide (RGO), and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps: firstly, preparing graphene oxide (GO) by utilizing an improved Hummer method; performing ultrasonic dispersion on GO by utilizing ultra-pure water to obtain a GO suspension, adding salt solutions of Na2PdCl4 and M to the suspension, performing ultrasonic treatment to enable metal precursors to be uniformly dispersed between GO nano sheet layers, then adding PEG(polyethylene glycol), and performing uniform mixing to obtain a final mixed solution; dropwise adding a sodium borohydride solution into the final mixed solution, performing standing reduction for 0.5h, and performing stirring to enable PdM metal particles to be uniformly loaded on the RGO; and finally, performing cleaning with a mixed solution of ultra-pure water and absolute ethanol, and performing vacuum suction filtration and freeze drying to obtain a PdM / RGO nano composite catalytic material. The PdM / RGO nano catalyst prepared by the method has uniform dispersity and large specific surface area, thereby improving the catalytic activity and stability; and the method is simple in technological process and high in feasibility.

Description

technical field [0001] The invention relates to a method for preparing a reduced graphene oxide-loaded Pd-M nanocomposite catalyst, which belongs to the technical field of catalyst preparation. Background technique [0002] A fuel cell is an energy conversion device that directly converts the chemical energy of fuel into electrical energy. It is not limited by the Carnot cycle during use, so its energy conversion efficiency is high. Low-temperature fuel cells have attracted great attention and developed rapidly due to their advantages such as simple structure, high energy conversion efficiency, low operating temperature, low noise and almost zero pollution. So far, Pt is still the fuel cell anode catalyst with the best catalytic activity. However, Pt is expensive and easily produces intermediates such as CO in the catalytic process, causing catalyst poisoning, which greatly reduces the catalytic activity and stability of Pt-based catalysts. . Graphene oxide (GO) has become...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M4/88
CPCH01M4/88H01M4/921H01M4/926Y02E60/50
Inventor 徐明丽吉金梅张英杰董鹏曾晓苑李雪林艳杨喜昆和秋谷
Owner KUNMING UNIV OF SCI & TECH
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