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Preparation method of PtCo intermetallic compound catalyst, and fuel cell

An intermetallic compound and catalyst technology, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of large particle size, low degree of ordering, and low metal loading of PtCo-IMC, and achieves the promotion of efficient formation and particle size. The effect of good diameter uniformity and high discharge performance

Active Publication Date: 2021-11-02
宁波中科科创新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, this application provides a kind of preparation method of PtCo intermetallic compound catalyst and a kind of fuel cell, to solve the existing PtCo-IMC particle size is big, cannot At the same time, the degree of ordering is relatively low, and the metal loading is low.

Method used

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  • Preparation method of PtCo intermetallic compound catalyst, and fuel cell
  • Preparation method of PtCo intermetallic compound catalyst, and fuel cell
  • Preparation method of PtCo intermetallic compound catalyst, and fuel cell

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preparation example Construction

[0033] In this embodiment, the preparation method of the PtCo intermetallic catalyst comprises the following steps:

[0034] Step 1: Dissolve a certain proportion of hydroxide, acetate and platinum salt in methanol, and add C carrier.

[0035] The methanol solution is deoxygenated in advance.

[0036] The platinum salt includes: at least one of chloroplatinic acid, sodium chloroplatinate, platinum acetylacetonate, potassium chloroplatinite and tetraaminodinitroplatinum; the hydroxide includes: sodium hydroxide, hydrogen At least one of potassium oxide, lithium hydroxide and ammonia water; the acetate includes at least one of sodium acetate, potassium acetate and cobalt acetate.

[0037] In the embodiment of the present invention, the molar ratio of platinum salt, hydroxide and acetate salt is 1:(2-4):(4-8).

[0038] The C carrier may be carbon powder, and the mass ratio of carbon powder to Pt may be (3-6):(4-7), for example, 6:4, 4:6 or 3:7. Specifically, the type of the ca...

Embodiment 1

[0067] 1) Weigh 82 mg of NaOH particles and 336.4 mg of sodium acetate powder in a round-bottomed flask, add 20 mL of methanol solution, and magnetically stir for 1 hour to fully dissolve the two until the solution is clear; then weigh 263.2 mg of chloroplatinic acid Dissolved in 10 mL of methanol solution, ultrasonically dispersed and dissolved to obtain a yellow solution; pour the above chloroplatinic acid solution into a round-bottomed flask and mix well; then, continue to feed N 2 Drive away the oxygen in the solution to achieve the purpose of deoxygenation.

[0068] 2) One mouth of the round-bottomed flask was connected to CO gas, the gas flow was adjusted to 50 sccm, and the gas was continuously fed, and the flask was placed in a water bath, and the temperature was set at 55 ° C, and the reaction was carried out for 12 hours to carry out carbonylation treatment. During the reaction, the color of the solution changed from yellow to dark green.

[0069] 3) Weigh 150 mg of...

Embodiment 2

[0078] According to the first 8 steps in the above-mentioned embodiment 1, in particular, in step 8), the heat treatment process is set as follows: 7°C / min is raised from room temperature to 300°C, and kept for 2 hours; The temperature was raised to 700°C for 1 min, and the two samples were kept for 1 hour and 4 hours respectively; then the temperature was naturally lowered, the lid was opened, and the heat-treated samples were taken out; then PtCo-IMC-1 and PtCo-IMC-4 were obtained according to step 9 in Example 1. Catalyst, where "1" and "4" refer to the corresponding products that are kept for 1 hour and 4 hours, respectively. The crystal structure is as follows figure 2 shown. ,

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Abstract

The invention discloses a preparation method of a PtCo intermetallic compound catalyst, and a fuel cell. The preparation method comprises the following steps: dissolving hydroxide, acetate and platinum salt in a certain proportion in methanol, and adding a carrier C; introducing a reaction gas into a mixed solution obtained in the previous step, and carrying out a carbonylation reaction of Pt to form a carbonyl Pt cluster compound; drying the methanol by distillation, and oxidizing the carbonyl Pt cluster compound to obtain a Pt / C precursor supported on C; dispersing a Pt / C precursor and cobalt precursor salt in ultrapure water, and then adding ammonia water into an obtained dispersion solution to form a cobalt-ammonia complex; heating the solution to decompose, oxidize and settle the cobalt-ammonia complex, and carrying out washing and drying to form a cobalt oxide-loaded Pt / C material; carrying out heat treatment on the cobalt oxide-loaded Pt / C material in a reducing atmosphere to obtain powder; and subjecting the powder to acid pickling so as to obtain the PtCo intermetallic compound catalyst. The PtCo intermetallic compound catalyst prepared by the method has high metal loading capacity and relatively high catalytic efficiency.

Description

technical field [0001] The present application relates to the technical field of fuel cells, in particular to a PtCo intermetallic compound catalyst and a method for forming the same. Background technique [0002] Nanostructured Pt materials play a crucial role as efficient oxygen reduction reaction (ORR) electrocatalysts in proton exchange membrane fuel cells (PEMFCs). Due to the scarcity of Pt reserves on earth, the use of Pt materials must be reduced if PEMFC is to be promoted on a large scale. The goal set by the U.S. Department of Energy (DOE) is to achieve a mass specific activity (MA) of 0.44Amg for Pt-based non-precious metal oxygen reduction (ORR) catalysts at 0.9V / RHE potential by 2020 -1 (Pt) , the decay of its MA is less than 44% after 30000 cycles of accelerated stability test. Based on this, a lot of scientific research has focused on improving the activity and durability of Pt-based catalysts, thereby really promoting the commercialization of PEMFCs. The f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92B82Y30/00B82Y40/00
CPCH01M4/921H01M4/926B82Y30/00B82Y40/00Y02E60/50
Inventor 杨辉程庆庆邹亮亮
Owner 宁波中科科创新能源科技有限公司
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