High-activity and high-stability PtNi nano-alloy catalyst as well as preparation method and application thereof

A nano-alloy, catalyst technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of catalyst activity loss, poor stability, etc., to reduce Pt loading, improve stability, mild conditions

Active Publication Date: 2020-11-10
SHANGHAI HYDROGEN PROPULSION TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although these Pt-transition metal catalysts, such as Pt-Ni alloy catalysts, have high catalytic activity for ORR, their stability is poor.
Especially in highly corrosive acidic environments, the transition metals exposed on the surface dissolve, leading to a substantial loss of catalyst activity

Method used

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  • High-activity and high-stability PtNi nano-alloy catalyst as well as preparation method and application thereof
  • High-activity and high-stability PtNi nano-alloy catalyst as well as preparation method and application thereof
  • High-activity and high-stability PtNi nano-alloy catalyst as well as preparation method and application thereof

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Experimental program
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preparation example Construction

[0066] The present invention also provides a kind of preparation method of PtNi nano-alloy material, comprises the following steps:

[0067] a) After dispersing the platinum source, the nickel source and the solvent, a dispersion liquid is obtained;

[0068] b) Under airtight conditions, after reacting the dispersion liquid obtained in the above steps, a reaction product is obtained;

[0069] c) After post-processing the reaction product obtained in the above steps, an intermediate is obtained;

[0070] d) Under a protective atmosphere, heat-treat the intermediate obtained in the above steps to obtain a PtNi nano-alloy material.

[0071] The selection, proportioning and process parameters of the materials in the steps of the above-mentioned PtNi nano-alloy materials of the present invention, and the corresponding optimization principles, and the selection, proportioning and process parameters of the materials in the follow-up PtNi nano-alloy catalyst preparation method, and c...

Embodiment 1

[0122] (1) In a 20mL reactor, weigh 40mg of platinum (II) acetylacetonate (Pt(acac) 2 ), 65mg nickel (II) acetylacetonate (Ni(acac) 2 ) and 40mg of Vulcan X72 carbon carrier, dispersed in 5mL N, N-dimethylformamide (DMF) under ultrasonic conditions;

[0123] (2) Maintain ultrasound for 50 minutes on the above-mentioned mixed precursor solution;

[0124] (3) Seal the above reaction kettle and place it in an oven, set the temperature at 120°C, and heat for 40h;

[0125] (4) After natural cooling, the product in the reactor was collected by centrifugation at 11000r / min for 8min;

[0126] (5) Add a water-ethanol mixture with a volume ratio of 1:1 (volume ratio 1:1) into the centrifuge tube containing the sample after centrifugation, and disperse and clean it by ultrasonication for 15 minutes. Centrifuge again at 11000r / min for 8min, repeat this step 3 times;

[0127] (6) The final product in step (5) was collected by centrifugation and vacuum-dried at 60° C. for 3 h;

[0128]...

Embodiment 2

[0152] (1) In a 25mL flask, weigh 40mg of platinum(II) acetylacetonate (Pt(acac) 2 ), 65mg nickel (II) acetylacetonate (Ni(acac) 2 ), dispersed in 5mL ethylene glycol under ultrasonic conditions, and another beaker was used to disperse 40mg of nitrogen-doped graphene ultrasonically in 5mL ethylene glycol;

[0153] (2) Keep ultrasound for 20min to the above-mentioned mixed precursor solution and graphene suspension;

[0154] (3) Use a magnetic stirrer to stir and mix the precursor solution, and simultaneously add the nitrogen-doped graphene suspension after ultrasonication dropwise to the mixed precursor solution under stirring;

[0155] (4) Heating in an oil bath, set the temperature at 160°C, and heat for 48 hours;

[0156] (5) After natural cooling, the product in the beaker was collected by centrifugation at 11000r / min for 8min;

[0157] (6) Add a water-ethanol mixture with a volume ratio of 1:1 (volume ratio 1:1) into the centrifuge tube containing the sample after cent...

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Abstract

The invention provides a PtNi nano-alloy material. A PtNi nano-alloy comprises PtNi nano-alloy particles of an octahedral structure and PtNi nano-alloy particles of a sphere-like structure. Accordingto the invention, research is carried out from the direction of adjusting the surface morphology and components of the nanoparticles, the stability of the PtNi nano-alloy catalyst is optimized, and the PtNi nano-alloy material with high oxygen reduction catalytic activity and high stability is obtained. The PtNi nano-alloy particles provided by the invention partially maintain the regular octahedron morphology, partially deform and are converted into a spherical shape, and partially are sintered. After the PtNi nano-alloy material is used as the catalyst, the PtNi nano-alloy material shows excellent catalytic performance in an oxygen reduction reaction, the catalytic reaction efficiency is improved, and the Pt loading capacity is reduced. The provided preparation method is simple and convenient, the one-step synthesis is achieved, no extra surfactant is needed for controlling the morphology, cleaning is easy and convenient, and the preparation method can be used for the proton exchangemembrane fuel cells.

Description

technical field [0001] The invention belongs to the technical field of nano-alloy catalysts for fuel cells, and relates to a PtNi nano-alloy material, a PtNi nano-alloy material catalyst and a preparation method thereof, and a fuel cell, in particular to a high-activity, high-stability PtNi nano-alloy material catalyst and its preparation method, application. Background technique [0002] Catalyst is one of the most common substances in chemical reactions. It refers to substances that can change the chemical reaction rate of reactants in chemical reactions without changing the chemical balance, and their quality and chemical properties have not changed before and after the chemical reaction. It is called a catalyst, and its relationship with the reaction system is like the relationship between a lock and a key, with a high degree of selectivity. According to statistics, more than 90% of industrial processes use catalysts, such as chemical, petrochemical, biochemical, and en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92B82Y30/00
CPCH01M4/921H01M4/925B82Y30/00Y02E60/50
Inventor 任欢沈水云章俊良周红茹罗夏爽郭杨格
Owner SHANGHAI HYDROGEN PROPULSION TECH CO LTD
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