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Catalyst for fuel cell, preparation method of catalyst and fuel cell

A technology of fuel cells and catalysts, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor catalytic activity and stability of Pt catalysts, and cannot meet the needs of practical applications.

Active Publication Date: 2022-05-24
SHENZHEN ACAD OF AEROSPACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem solved by the present invention is that the existing Pt catalysts have poor catalytic activity and stability and cannot meet the needs of practical applications.

Method used

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  • Catalyst for fuel cell, preparation method of catalyst and fuel cell
  • Catalyst for fuel cell, preparation method of catalyst and fuel cell
  • Catalyst for fuel cell, preparation method of catalyst and fuel cell

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preparation example Construction

[0037] combine figure 1 As shown, the preparation method of the catalyst for a fuel cell according to the embodiment of the present invention includes the following steps:

[0038] Synthetic CeO 2 Nanoparticles;

[0039] Configure the mixed solution of metal precursor salt;

[0040] the CeO 2 Nanoparticles are added to the mixed solution of the metal precursor salt, and a reducing agent is added, and a pyrolysis reduction reaction is carried out under the protection of an inert gas to obtain core-shell structure nanoparticles; wherein, the temperature of the pyrolysis reduction reaction is 200- 230℃, the time is 0.5-1h;

[0041] The core-shell structure nanoparticles are supported on a carrier, and after post-treatment, a catalyst for a fuel cell is obtained.

[0042] In this example, a smaller CeO is first synthesized 2 The metal nanoparticles are used as the core, and then the mixed solution of metal precursor salt is configured, and the CeO 2 Nanoparticles and a redu...

Embodiment 1

[0064] Step S1: Synthesis of CeO 2 Nanoparticles, including:

[0065] Step S11: under mild nitrogen protection, mix and stir 170 mg of cerium nitrate, 15 mL of octadecene and 5 mL of oleylamine, slowly heat to 260° C. for 20 min and keep the temperature for one hour to obtain a first mixed solution;

[0066] Step S12: cooling the mixed solution obtained in step S11, centrifuging with ethanol to obtain CeO 2 Nanoparticles, the CeO 2 The nanoparticle size is 10 nm.

[0067] Step S2: Using Pt(acac)2 as a precursor, a mixed solution of metal precursor salts is prepared, and CeO 2 Nanoparticles are added to it, and the reducing agent Fe(CO) is added 5 (Pentahydroxy iron), carry out a pyrolysis reduction reaction under the protection of an inert gas to obtain core-shell structure nanoparticles, specifically including:

[0068] Step S21: Dissolve 100 mg of sodium oleate in 12 mL of ODE (Octadecene, octadecene) solution under nitrogen protection, stir and heat it to 180°C, then l...

Embodiment 2

[0084] The difference between this embodiment and Embodiment 1 is that the CeO 2 The particle size of the nanoparticles is 18nm, including:

[0085] Step S1: Synthesis of CeO 2 Nanoparticles;

[0086] Step S11: under mild nitrogen protection, mix and stir 170 mg of cerium nitrate, 10 mL of octadecene and 1.5 mL of oleylamine, slowly heat to 260° C. for 20 min and keep the temperature for one hour to obtain a first mixed solution;

[0087] Step S12: cooling the mixed solution obtained in step S11, centrifuging with ethanol to obtain CeO 2 nanoparticles.

[0088] Step S2: Using Pt(acac)2, sodium oleate, ODE, OAM and OA solution as raw materials to prepare a mixed solution of metal precursor salts, CeO 2 Nanoparticles are added to it, and the reducing agent Fe(CO) is added 5 (Pentahydroxy iron), under the protection of an inert gas, a pyrolysis reduction reaction is carried out to obtain core-shell structure nanoparticles;

[0089] Step S3: the core-shell structure CeO 2 / ...

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Abstract

The invention provides a catalyst for a fuel cell, a preparation method of the catalyst and the fuel cell, and the preparation method of the catalyst for the fuel cell comprises the following steps: synthesizing CeO2 nano-particles, preparing a mixed solution of metal precursor salt, adding the CeO2 nano-particles and a reducing agent into the mixed solution, the preparation method comprises the following steps: adding CeO2 into a reaction kettle, carrying out pyrolysis reduction reaction under the protection of inert gas at the temperature of 200-230 DEG C for 0.5-1 hour, finally loading the nano-particles onto a carrier, and carrying out post-treatment to obtain the CeO2 nano-particles as the catalyst for the fuel cell, wherein the temperature of the pyrolysis reduction reaction is 200-230 DEG C, and the time of the pyrolysis reduction reaction is 0.5-1 hour. According to the preparation method of the catalyst for the fuel cell, disclosed by the invention, the CeO2 metal nanoparticles are taken as the inner core, the reaction path is coordinated and controlled by utilizing oxygen defects existing in molecules of the CeO2 metal nanoparticles, the electronic structure on the surface of the catalyst is effectively regulated and controlled, and the dispersity of loaded metal is promoted, so that the catalyst has more excellent electro-catalytic performance and electrochemical stability.

Description

technical field [0001] The present invention relates to the technical field of fuel cells, in particular, to a catalyst for fuel cells, a preparation method thereof, and a fuel cell. Background technique [0002] With the rapid development of the economy and society, the energy shortage and environmental problems faced by human beings are becoming more and more serious. It is imperative to develop green energy and explore new energy conversion technologies. A fuel cell is a device that directly converts chemical energy into electrical energy without combustion. Among them, proton exchange membrane fuel cells have the advantages of low operating temperature, fast startup, high specific power, simple structure and environmental friendliness. The oxygen reduction reaction is the core reaction of proton exchange membrane fuel cells, but the kinetic process of the oxygen reduction reaction is relatively slow, and the currently widely used catalysts still use the expensive and sca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92
CPCH01M4/921H01M4/926Y02E60/50
Inventor 吕海峰瞿威张胜刚
Owner SHENZHEN ACAD OF AEROSPACE TECH
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