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Core-shell platinum-based alloy electrocatalyst with high oxygen reduction performance and preparation method thereof

A technology of electrocatalysts and platinum-based alloys, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of block copolymers being difficult to wash and remove, and the reduction of electrocatalytic activity, and achieve novel and unique preparation methods

Active Publication Date: 2021-03-16
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong adsorption of these block copolymers and metal surface atoms, the block copolymers adsorbed on the surface of the electrocatalyst after the reaction are very difficult to remove by washing, which will cover the active sites on the surface of the electrocatalyst and cause electrocatalytic activity. reduction of
Therefore, it is still extremely challenging to design a simple reaction system without the participation of block copolymers to construct high-performance Pt-based alloy electrocatalysts.

Method used

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  • Core-shell platinum-based alloy electrocatalyst with high oxygen reduction performance and preparation method thereof
  • Core-shell platinum-based alloy electrocatalyst with high oxygen reduction performance and preparation method thereof
  • Core-shell platinum-based alloy electrocatalyst with high oxygen reduction performance and preparation method thereof

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Effect test

Embodiment 1

[0038] 1) PtCu 3 Preparation of nanodendrites

[0039]Inject 400 μL of a mixed solution of chloroplatinic acid and copper nitrate (containing 0.038 mmol of chloroplatinic acid and 0.114 mmol of copper nitrate) into a three-necked flask containing 10 mL of oleylamine, and heat and stir at 120 °C for 10 min to remove water in the system. Afterwards, air was introduced into the bottle, and the three-necked flask was transferred to a 270°C oil bath. After 5 minutes, the air was replaced with argon, the reaction was continued for 25 minutes, the reaction was stopped, and cooled to room temperature. Centrifuged and washed 5 times with n-hexane to obtain PtCu 3 nano dendrites. Its general preparation process is as follows figure 1 shown.

[0040] 2) Structural composition analysis of the catalyst

[0041] Combining multiple characterization techniques for the preparation of PtCu 3 The structural composition of nanodendritic catalysts was analyzed in depth: ICP-AES gave the ato...

Embodiment 2

[0051] 1) Preparation of PtCu nanodendrites

[0052] Inject 400 μL of a mixed solution of chloroplatinic acid and copper nitrate (containing 0.076 mmol of chloroplatinic acid and 0.076 mmol of copper nitrate) into a three-necked flask containing 10 mL of oleylamine, and heat and stir at 120 °C for 10 min to remove water in the system. Afterwards, air was introduced into the bottle, and the three-necked flask was transferred to a 270°C oil bath. After 5 minutes, the air was replaced with argon, the reaction was continued for 25 minutes, the reaction was stopped, and cooled to room temperature. The PtCu nanodendrites were obtained by centrifuging and washing 5 times with n-hexane. Its TEM characterization results are as follows Figure 7 As shown, the size of the formed nanodendrites is more uniformly distributed.

[0053] 2) Carbon loading and electrochemical dealloying of PtCu nanodendrites

[0054] The prepared PtCu nano dendrites were dispersed in isopropanol, Vulcan XC-...

Embodiment 3

[0060] 1) Pt 3 Preparation of Cu nanodendrites

[0061] Inject 400 μL of a mixed solution of chloroplatinic acid and copper nitrate (containing 0.114 mmol of chloroplatinic acid and 0.038 mmol of copper nitrate) into a three-necked flask containing 10 mL of oleylamine, and heat and stir at 120 °C for 10 min to remove water in the system. Afterwards, air was introduced into the bottle, and the three-necked flask was transferred to a 270°C oil bath. After 5 min the air was replaced with argon. React for another 25 min, stop the reaction, and cool to room temperature. Centrifuged and washed 5 times with n-hexane to obtain Pt 3 Cu nanodendrites. Its TEM characterization results are as follows Figure 8 As shown, the size of the formed nanodendrites is more uniformly distributed.

[0062] 2) Pt 3 Carbon loading and electrochemical dealloying of Cu nanodendrites

[0063] The resulting Pt 3 Cu nano dendrites were dispersed in isopropanol, Vulcan XC-72R conductive carbon blac...

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Abstract

The invention belongs to the technical field of new energy, and relates to an electrocatalyst for cathodes of fuel cells and metal-air cells, in particular to a core-shell platinum-based alloy electrocatalyst with high oxygen reduction performance and a preparation method of the core-shell platinum-based alloy electrocatalyst. The preparation method comprises the following steps: 1) adding a platinum compound and a transition metal compound into oleylamine, introducing oxygen-containing gas into the reaction system, and conducting heating in an oxidizing atmosphere to carry out a first-stage reaction, then switching the oxidizing atmosphere into an inert atmosphere, continuously conducting heating to carry out a second-stage reaction, conducting cooling after the reaction is finished, andconducting washing to obtain a product; and 2) carrying out electrochemical dealloying treatment on the product to obtain the core-shell platinum-based alloy electrocatalyst, wherein in the step 1), the first-stage reaction time and the second-stage reaction time are not zero at the same time. According to the preparation method, a segmented copolymer represented by PVP and the like is not added as a protective agent, and the Pt-based alloy electrocatalyst is prepared simply by switching atmosphere regulation.

Description

technical field [0001] The invention belongs to the technical field of new energy, and relates to an electrocatalyst for a cathode of a fuel cell and a metal-air battery, in particular to a core-shell platinum-based alloy electrocatalyst with high oxygen reduction performance and a preparation method thereof. Background technique [0002] Fuel cells and metal-air batteries are considered to be efficient and environmentally friendly energy conversion and storage devices. However, the slow kinetics of the cathodic oxygen reduction reaction and the high price of Pt catalyst hinder its large-scale application. Therefore, it is imperative to design and develop high-performance low-Pt electrocatalysts. Effective methods include: (1) alloying, that is, to improve the performance of the catalyst by forming an alloy of Pt with a transition metal. The introduction of transition metals reduces the amount of Pt on the one hand, and moderately weakens the adsorption energy of Pt and ox...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M4/90H01M4/88
CPCH01M4/92H01M4/925H01M4/9058H01M4/8825Y02E60/50
Inventor 陈胜利廖宇翔张世明
Owner WUHAN UNIV
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