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Fuel cell cathode oxygen reduction catalyst and preparation method and application thereof

A fuel cell cathode and catalyst technology, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc., can solve the problems of carrier corrosion and reduce the life of Pt catalysts, etc.

Active Publication Date: 2021-05-18
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the cathodic oxygen reduction catalyst undergoes severe carrier corrosion under fuel cell start-stop conditions or other high-potential conditions, which seriously reduces the life of the Pt catalyst. Therefore, the development of long-life, high-stability, corrosion-resistant oxygen reduction catalysts has become the current development of fuel cell technology. inevitable trend of

Method used

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  • Fuel cell cathode oxygen reduction catalyst and preparation method and application thereof
  • Fuel cell cathode oxygen reduction catalyst and preparation method and application thereof
  • Fuel cell cathode oxygen reduction catalyst and preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0040] figure 1 It is a schematic diagram of the preparation principle of the novel long-life Pt / TiN@C oxygen reduction catalyst in the present invention, and the preparation method includes the following steps:

[0041] Step 1, the titanium-containing precursor, the N- and C-containing precursors are mixed uniformly by high-speed ball milling. The titanium-containing precursor is titanium dioxide nanoparticles with a diameter of 5-60nm, the N and C-containing precursors are: guanidine hydrochloride, biuret, melamine or urea, and the mass ratio of the titanium-containing precursor to the C and N-containing precursor is 1:5~1:40.

[0042] In step two, the powder obtained in step one is subjected to high-temperature heat treatment in a vacuum environment, the heat treatment temperature is 700-1100° C., and the heat treatment temperature time is 30-240 minutes. Naturally cool to room temperature.

[0043] In step three, the powder obtained in step two is ground to obtain the T...

Embodiment 1

[0046] In this example, a 10% Pt / TiN@C composite carrier catalyst was prepared.

[0047] A preparation method of a novel long-life Pt / TiN@C oxygen reduction catalyst in this embodiment comprises the following steps:

[0048] (1) Take nano-titanium oxide and guanidine hydrochloride (specifically 1000 mg guanidine hydrochloride and 100 mg nano-titanium oxide particles with a diameter of 5-10 nm) with a mass ratio of 1:10 with an electronic balance and place them in a planetary ball mill for ball milling for 3 hours, so that The guanidine hydrochloride and the titanium oxide are fully and physically mixed uniformly.

[0049] (2) Place the uniformly mixed guanidine hydrochloride and titanium oxide in an alumina / quartz crucible, slowly put it into a tube furnace, and raise the temperature to 900° C. at a rate of 10° C. / min in a vacuum environment, and keep it warm for 2 hours. Perform high-temperature heat treatment, and after the heat preservation is completed, naturally cool to ...

Embodiment 2

[0058] This example is basically the same as Example 1, except for the particle size of titanium oxide.

[0059] Four sets of parallel experiments were designed to change the size of the Ti-containing precursor, that is, 5-10nm titanium oxide, to 20nm, 40nm, 60nm and 70nm respectively, and other conditions and steps remained the same as in Example 1.

[0060] The particle size of TiN@C nanoparticles obtained after changing the size of the Ti-containing precursor, namely 5-10nm titanium oxide, to 20nm, 40nm and 60nm gradually increased. When the size of the Ti-containing precursor increased to 70nm, the obtained TiN@C The particles reach the submicron level, the specific surface area is too small, and the catalytic performance is poor.

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Abstract

The invention discloses a fuel cell cathode oxygen reduction catalyst as well as a preparation method and application thereof, the catalyst takes TiN nanoparticles coated with a porous carbon layer on the surface as a carrier, and Pt particles are loaded on the exposed TiN surface of the porous carbon layer. a titanium-containing precursor and a nitrogen-containing carbon precursor are uniformly mixed to obtain mixed powder; heat treatment is carried out on the mixed powder in a vacuum environment, and then grinding treatment is performed to obtain a catalyst carrier coated with a porous carbon layer; and the catalyst carrier is mixed with a platinum-containing compound, and reducing is performed to obtain the composite catalyst loaded with Pt particles. The fuel cell cathode oxygen reduction catalyst has the advantages of long service life, acid resistance, high temperature resistance, corrosion resistance and excellent electrochemical performance.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a fuel cell catalyst and its preparation method and application. Background technique [0002] A low-temperature proton exchange membrane fuel cell (PEMFC) is a device that can directly convert chemical energy into electrical energy through an electrochemical reaction. It has the advantages of high energy conversion efficiency, cleanliness, and low noise. It is widely used in the fields of emergency power supply and community combined heat and power supply. [0003] However, the cathodic oxygen reduction catalyst undergoes severe carrier corrosion under fuel cell start-stop conditions or other high-potential conditions, which seriously reduces the life of the Pt catalyst. Therefore, the development of long-life, high-stability, corrosion-resistant oxygen reduction catalysts has become the current development of fuel cell technology. inevitable trend. Contents of the invention [000...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M4/88B82Y30/00
CPCH01M4/921H01M4/926H01M4/925H01M4/8825B82Y30/00H01M2004/8689Y02E60/50
Inventor 刘建国张宏宇李佳
Owner NANJING UNIV
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