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Pd/MGN composite material with high oxidization reduction electrocatalytic activity as well as preparation method and application thereof

A composite material and electrocatalysis technology, applied in nanotechnology, circuits, electrical components, etc. for materials and surface science, can solve the problems of large size of Pd nanoparticles, interference with catalytic ORR activity, and low mass transfer rate of the carrier. Achieve the effects of simple preparation, high conductivity, and improved catalytic activity and efficiency

Active Publication Date: 2018-11-09
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during synthesis and catalysis, ultra-small nanoparticles with large surface energies tend to flow and aggregate, which reduces their catalytic efficiency.
Although the use of conductive porous nanomaterials with a large specific surface area to support Pd NPs can slow down the aggregation of Pd NPs, it usually involves the use of organic stabilizers, complex precursor preparation, and low-temperature (zero-degree) reactions, which significantly increase the cost of preparation and will Interfering with catalytic ORR activity
Not only that, the composite catalysts obtained by these strategies still have large Pd nanoparticles, and the supports usually have low mass transfer rates.

Method used

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  • Pd/MGN composite material with high oxidization reduction electrocatalytic activity as well as preparation method and application thereof
  • Pd/MGN composite material with high oxidization reduction electrocatalytic activity as well as preparation method and application thereof
  • Pd/MGN composite material with high oxidization reduction electrocatalytic activity as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Add 2g of MCM-22 to a mixed solution containing 1.45g of sucrose, 100μl of concentrated sulfuric acid and 6ml of water, stir evenly, and after standing for 6h, pre-carbonize at 160°C for 18h, then add 0.87g of sucrose, 60μl A mixed solution of concentrated sulfuric acid and 6ml of water was stirred evenly, left to stand for 6 hours, and then pre-carbonized at 160°C for 18 hours to obtain a solid powder.

[0038] (2) the solid powder in step (1) is put into the tube furnace, and the Ar 2 After calcining at 800°C for 2h, take it out to obtain MCM-22 / mesoporous graphene network composite material, put it into 2.5L NaOH (4mol / L) solution, stir at 70°C for 6h, centrifuge, wash with water until neutral, Freeze-drying can get mesoporous graphene network (MGN) powder.

[0039] (3) Add 0.3 mL K to 2.5 mL mesoporous graphene network (MGN) aqueous solution (20 mg / mL) dispersed uniform 2 PdCl 4 aqueous solution (0.15mol / L), after ultrasonication for 30min, add 0.5mL NaOH (1m...

Embodiment 2

[0047] (1) Add 1.3g of MCM-22 to the mixed solution containing 0.9g of sucrose, 60μl of concentrated sulfuric acid and 3ml of water, stir evenly, after standing for 6h, pre-carbonize at 180°C for 12h, then add 0.5g of sucrose, A mixed solution of 30 μl of concentrated sulfuric acid and 3ml of water was stirred evenly, left to stand for 6 hours, and then pre-carbonized at 100°C for 18 hours to obtain a solid powder.

[0048] (2) the solid powder in step (1) is put into the tube furnace, and the Ar 2 After calcining at 800°C for 2h, take it out to obtain MCM-22 / mesoporous graphene network composite material, put it into 2.5L NaOH (4mol / L) solution, stir at 60°C for 2h, centrifuge, wash with water until neutral, Freeze-drying can get mesoporous graphene network (MGN) powder.

[0049] (3) Add 0.06mL K 2 PdCl 4 aqueous solution (0.15mol / L), after ultrasonication for 30min, add 0.1mL NaOH (2mol / L) and NaBH 4 (1mol / L) mixed aqueous solution, stirred at 50° for 1h, centrifuged at ...

Embodiment 3

[0051] (1) Add 1g MCM-22 to the mixed solution containing 0.8g sucrose, 50μl concentrated sulfuric acid and 3ml water, stir evenly, after standing for 5h, pre-carbonize at 160℃ for 18h, then add 0.4g sucrose, 30μl A mixed solution of concentrated sulfuric acid and 3ml of water was stirred evenly, allowed to stand for 5 hours, and then pre-carbonized at 160°C for 18 hours to obtain a solid powder.

[0052] (2) the solid powder in step (1) is put into the tube furnace, and the Ar 2 After calcining at 1100°C for 2h, take it out to obtain MCM-22 / mesoporous graphene network composite material, put it into 1.5L NaOH (4mol / L) solution, stir at 60°C for 6h, centrifuge, wash with water until neutral, Freeze-drying can get mesoporous graphene network (MGN) powder.

[0053] (3) Then add 0.6mLK to 5mL mesoporous graphene network (MGN) aqueous solution (20mg / mL) dispersed uniformly 2 PdCl 4 aqueous solution (0.15mol / L), after ultrasonication for 30min, add 0.1mL NaOH (1mol / L) and NaBH ...

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Abstract

The invention relates to a Pd / MGN composite material with high oxidization reduction electrocatalytic activity as well as a preparation method and application thereof. The Pd / MGN composite material takes a mesoporous graphene network as a carrier of Pd nanoparticles and the content of Pd is 3 percent to 30 percent; the preparation method comprises the following steps: preparing a solid; preparingan MCM-22 / mesoporous graphene network composite material; preparing a mesoporous graphene network MGN; preparing the Pd / MGN composite material. The Pd / MGN composite material is applied to a cathode ofa fuel battery. According to the Pd / MGN composite material, an organic solvent and a stabilizing agent are not needed, and high temperature and high pressure are not needed; the Pd / MGN composite material has the advantages of simplicity in operation, good repeatability, relatively low cost, easiness for production and capability of being prepared in a large scale; the obtained palladium / mesoporous graphene network (Pd / MGN) composite material has efficient oxidization reduction electrocatalytic activity and stability which are remarkably better than those of the most advanced Pt / C catalyst atpresent.

Description

technical field [0001] The invention belongs to the field of high oxygen reduction reaction catalysts and their preparation and application, in particular to a Pd / MGN composite material with high redox electrocatalytic activity and its preparation method and application. Background technique [0002] Rational design and synthesis of electrocatalysts with high oxygen reduction reaction (ORR) activity is an effective way to overcome the kinetic hysteresis of fuel cell cathode reactions. Conventional platinum (Pt) or platinum-based noble metal catalysts are used due to their high activity. However, the scarcity, high cost, low stability, and permeation interference of platinum-based catalysts limit their large-scale production applications. In comparison, Pd is much cheaper than Pt (the reserves of Pd on the earth are at least 50 times that of Pt), has comparable activity to Pt and better anti-poisoning ability, and is expected to replace Pt-based catalysts. To improve the ut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92B82Y30/00
CPCB82Y30/00H01M4/926Y02E60/50
Inventor 王义崔雪雪
Owner DONGHUA UNIV
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