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Preparation method of crown-like multistage PdAg nanodendrite, material obtained through preparation method and application

A tree crown and nanotechnology, applied in the field of Pd-based alloy nanodendrites, can solve the problems of high price of the morphology control agent, harsh reaction conditions, and energy consumption, and achieve large-scale production, simple preparation methods, and reduced The effect of energy consumption

Active Publication Date: 2018-10-16
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the past, there are usually two ways to prepare PdAg alloys with special morphology. One is to prepare Ag seeds with special morphology, and obtain PdAg alloy catalysts with special structures through the replacement reaction between Ag and Pd metal precursors at low temperature. , the reaction conditions are mild, but the steps are more complicated; the other is to use a high-temperature oil bath, a longer growth time, or a high-temperature and high-pressure hydrothermal approach, and add a structure-directing agent to control the reduction rate of the two metal precursors, Pd and Ag. Its reduction potential is within a reasonable range, making it grow slowly into a PdAg alloy with special morphology and structure. Although the reaction step is only one step, the reaction conditions are relatively harsh, and large-scale production is more energy-consuming and time-consuming. Control agents are also often expensive

Method used

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  • Preparation method of crown-like multistage PdAg nanodendrite, material obtained through preparation method and application
  • Preparation method of crown-like multistage PdAg nanodendrite, material obtained through preparation method and application
  • Preparation method of crown-like multistage PdAg nanodendrite, material obtained through preparation method and application

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Effect test

Embodiment 1

[0033] A kind of preparation method of tree crown multi-level PdAg nano dendrite, comprises the following steps:

[0034] 1) Preparation of reaction solution: using 6 mL of water as a solvent, 1.125 mL of 0.05M Pd(OAc) was added thereto 2 Aqueous solution with 0.375mL of 0.05M AgNO 3 After the aqueous solution is mixed, it is fully sonicated to make it evenly mixed, and then 1.5 mL of 0.5M 1-naphthol alcohol solution is added, and the ultrasonically mixed homogeneously.

[0035] 2) Preparation of multi-level PdAg nano-dendrites in the crown of the tree: the above reaction solution was placed in a water bath at 60 ° C for 15 min, and after cooling to room temperature, the obtained black precipitated product was centrifuged at 10,000 rpm for 5 min, and washed four times with ethanol The crown multi-level PdAg nano-dendrite can be obtained.

Embodiment 2

[0037] A kind of preparation method of tree crown multi-level PdAg nano dendrite, comprises the following steps:

[0038] 1) Preparation of reaction solution: using 6 mL of water as a solvent, 1.125 mL of 0.05M Pd(OAc) was added thereto 2 Aqueous solution with 0.375mL of 0.05M AgNO 3 After the aqueous solution is mixed, it is fully sonicated to make it evenly mixed, then 0.15 mL of 0.5M 1-naphthol alcohol solution is added, and the ultrasonically mixed homogeneously.

[0039] 2) Preparation of multi-level PdAg nano-dendrites in the crown of the tree: the above reaction solution was placed in a water bath at 60 ° C for 15 min, and after cooling to room temperature, the obtained black precipitated product was centrifuged at 10,000 rpm for 5 min, and washed four times with ethanol The crown multi-level PdAg nano-dendrite can be obtained.

Embodiment 3

[0041] A kind of preparation method of tree crown multi-level PdAg nano dendrite, comprises the following steps:

[0042] 1) Preparation of reaction solution: using 6 mL of water as a solvent, 1.125 mL of 0.05M Pd(OAc) was added thereto 2 Aqueous solution with 0.375mL of 0.05M AgNO 3 After the aqueous solution is mixed, it is fully sonicated to make it evenly mixed, then 15 mL of 0.5M 1-naphthol alcohol solution is added, and the ultrasonically mixed homogeneously.

[0043] 2) Preparation of multi-level PdAg nano-dendrites in the crown of the tree: the above reaction solution was placed in a water bath at 60 ° C for 15 min, and after cooling to room temperature, the obtained black precipitated product was centrifuged at 10,000 rpm for 5 min, and washed four times with ethanol The crown multi-level PdAg nano-dendrite can be obtained.

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Abstract

The invention discloses a preparation method of a crown-like multistage PdAg nanodendrite, a material obtained through the preparation method and an application of the material as an oxygen reductioncathode catalyst. The preparation method comprises the steps of adding a Pd-based metal precursor, an Ag-based metal precursor and 1-naphthol into a solvent, mixing evenly and then standing for reaction; and separating, washing and drying generated precipitates to obtain the crown-like multistage PdAg nanodendrite. The method disclosed by the invention is mild in condition, relatively high in yield and suitable for commercial production. The obtained crown-like multistage PdAg nanodendrite has the advantages of excellent electrocatalytic activity and stability as the oxygen reduction cathode catalyst.

Description

technical field [0001] The invention relates to a preparation method of a tree crown multi-level PdAg nano-dendrite, the obtained material and the application of the material as an oxygen reduction cathode catalyst, belonging to the technical field of Pd-based alloy nano-dendrite. Background technique [0002] In recent years, oxygen reduction reaction (ORR) has played an important role in the fields of energy conversion and storage, and has been widely used in renewable fuel cells and new-generation metal-air batteries. The disadvantages such as slowness greatly limit the energy conversion efficiency during the reaction. Therefore, it is of great significance to develop an ORR catalyst with high catalytic activity and stable performance. [0003] So far, Pt and Pt-based alloys are considered to be the most effective ORR electrocatalysts, but the high price, scarcity of reserves, fuel penetration, and catalyst instability of the precious metal Pt greatly limit its commercia...

Claims

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Application Information

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IPC IPC(8): H01M4/92B82Y30/00B82Y40/00
CPCH01M4/921H01M4/928B82Y30/00B82Y40/00Y02E60/50
Inventor 唐亚文江娴黄祯娜孙境泽刘群付更涛孙冬梅徐林
Owner NANJING NORMAL UNIVERSITY
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