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Porous platinum nano dendritic crystal electrocatalyst and preparation method thereof

An electrocatalyst, platinum nanotechnology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of high price and unenvironmental protection of organic solvents, and achieve low cost and simple method. , the effect of low energy consumption

Pending Publication Date: 2021-12-24
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The thermal reduction method consumes a large amount of reducing gas and requires an external heat source; the organic solvent required by the organic solvent liquid phase reduction method is not environmentally friendly and relatively expensive

Method used

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  • Porous platinum nano dendritic crystal electrocatalyst and preparation method thereof
  • Porous platinum nano dendritic crystal electrocatalyst and preparation method thereof
  • Porous platinum nano dendritic crystal electrocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A preparation method of porous platinum nano dendrite electrocatalyst, comprising the following steps:

[0046] According to the ratio of surfactant cetyltrimethylammonium bromide and chloroplatinic acid molar ratio of 24:1, take a certain mass of cetyltrimethylammonium bromide and dissolve it in water, and then continue to dissolve chlorine Platinic acid, to obtain the precursor solution, seal the precursor solution for use; then inject a sufficient amount of ascorbic acid into the precursor solution under the air atmosphere until the mixture is saturated, and react for 4 hours; centrifuge, wash, and Vulcan XC- 72R conductive carbon black was composited to obtain carbon-supported porous platinum nanodendritic electrocatalysts.

[0047] Test Characterization and Analysis:

[0048] like figure 1 As shown, the XRD test curve shows that the porous platinum nanodendritic electrocatalyst of this example exhibits typical platinum metal characteristic peaks. TEM results such ...

Embodiment 2

[0054] This embodiment is basically the same as Embodiment 1, especially in that:

[0055] In this embodiment, a method for preparing a porous platinum nano-dendritic electrocatalyst uses an anionic surfactant to prepare a porous platinum nano-dendritic electrocatalyst, comprising the following steps:

[0056] According to the ratio of sodium dodecylbenzenesulfonate to chloroplatinic acid molar ratio of 24:1, weigh a certain mass of sodium dodecylbenzenesulfonate and dissolve it in water, and then continue to dissolve chloroplatinic acid to obtain a precursor solution , seal the precursor solution for use; then inject a sufficient amount of ascorbic acid into the precursor solution in an air atmosphere until the mixture is saturated, and react for 4 hours; centrifuge, wash, and compound with Vulcan XC-72R conductive carbon black to obtain carbon Supported porous platinum nanodendritic electrocatalysts.

[0057] Test Characterization Pre-Analysis:

[0058] TEM results such as...

Embodiment 3

[0061] This embodiment is basically the same as the above-mentioned embodiment, especially in that:

[0062] In this embodiment, a method for preparing a porous platinum nanodendritic electrocatalyst comprises the following steps:

[0063] According to the ratio of F127 and chloroplatinic acid molar ratio of 24:1, weigh a certain mass of F127 and dissolve it in water, then continue to dissolve chloroplatinic acid to obtain a precursor solution, seal the precursor solution for use; Inject a sufficient amount of ascorbic acid into the precursor solution until the mixture is saturated, and react for 4 hours; centrifuge, wash, and compound with Vulcan XC-72R conductive carbon black to obtain a carbon-supported porous platinum nanodendritic electrocatalyst.

[0064] Test Characterization and Analysis:

[0065] TEM results such as Figure 7 As shown, it is a porous nanosphere structure with a particle size of about 40-70nm.

[0066] A standard three-electrode system was used to c...

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Abstract

The invention discloses a preparation method of a porous platinum nano dendritic crystal electrocatalyst, which comprises the following steps of weighing a certain mass of surfactant according to the molar ratio of the surfactant to a platinum compound of (0-100): 1, dissolving the surfactant in water, continuously dissolving the platinum compound in the water, and introducing protective gas until the mixed solution is saturated to obtain a precursor solution, and injecting a reducing agent into the precursor solution, reacting for at least 0.5 hour, centrifuging the product solution, and washing solids to obtain the porous platinum nano dendritic crystal electrocatalyst. The porous platinum nano dendritic crystal electrocatalyst is of a porous nanosphere structure, the particle size of nanospheres ranges from 5 nm to 300 nm, nanodendritic crystalsare woven into a three-dimensional network to form the porous nanospheres, the length of the nanodendritic crystal ranges from 3 nm to 15 nm, and the diameter ranges from 0.5 nm to 3 nm. The preparation method disclosed by the invention is simple and easy to implement, suitable for large-scale production, low in energy consumption, simple to operate and convenient in post-treatment. The porous platinum nano dendritic crystal electrocatalyst has high oxygen reduction performance, excellent catalytic activity and high stability.

Description

technical field [0001] The invention belongs to the technical field of new energy, and relates to an electrocatalyst for fuel cells and metal-air battery cathodes, in particular to a porous platinum nano-dendritic electrocatalyst with high oxygen reduction performance and a preparation method thereof. Background technique [0002] Fuel cells are a class of energy conversion and storage devices with high efficiency and environmental friendliness. However, the slow kinetics of the cathode oxygen reduction reaction is one of the main challenges they face. Currently, platinum on carbon (Pt / C) remains the most practical commercial catalyst, but high cost and low yield and poor durability hinder its widespread use in fuel cells. Therefore, it is very important to find a suitable technical route to improve the activity and stability to reduce the cost of catalysts and popularize such chemical power sources! [0003] Traditional Pt catalysts are several nanometer-sized particles. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92B82Y30/00B82Y40/00
CPCH01M4/925H01M4/926B82Y30/00B82Y40/00Y02E60/50
Inventor 张世明赵晓容忠言张久俊
Owner SHANGHAI UNIV
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