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Alloy catalyst as well as preparation method and application thereof

An alloy catalyst and solvent technology, which is applied in the field of electrochemical materials to achieve the effect of improving oxygen reduction activity and solving electrochemical polarization

Active Publication Date: 2022-01-04
CHINA AUTOMOTIVE INNOVATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention mixes and reacts the precursor solution of ammonium chloroplatinate, cobalt and zinc with the 2-aminoterephthalic acid solution to generate a metal-organic framework material, and then performs segmental sintering to obtain a platinum-cobalt alloy located on a porous carbon support. The above-mentioned alloy catalyst solves the problem of excessive electrochemical polarization and concentration polarization of the catalyst, and improves the oxygen reduction activity of the catalyst

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  • Alloy catalyst as well as preparation method and application thereof
  • Alloy catalyst as well as preparation method and application thereof
  • Alloy catalyst as well as preparation method and application thereof

Examples

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Embodiment 1

[0056] This embodiment provides a method for preparing an alloy catalyst, the preparation method is as follows:

[0057] (1) Get 10 mmoles of 2-aminoterephthalic acid, 10 mmoles of zinc nitrate hexahydrate, 1 mmoles of cobalt nitrate hexahydrate and 1 mmoles of ammonium chloroplatinate, dissolve in 500 milliliters of methanol, stir at room temperature After 60 min, it was transferred to a stainless steel high-pressure reactor with a polytetrafluoroethylene liner, kept at 100 °C for 12 h, then cooled naturally, and dried in vacuum at 80 °C to obtain a metal-organic framework containing platinum, cobalt and zinc elements Material;

[0058] (2) Put the metal-organic framework material obtained in step (1) in a tube furnace, and perform heat treatment in stages in a hydrogen-nitrogen mixture (hydrogen is 10% by volume). Heating at a heating rate of 1 min to 300°C and holding for 8 hours is the first heating process; then heating at a heating rate of 10°C / min to 800°C and holding ...

Embodiment 2

[0060] This embodiment provides a method for preparing an alloy catalyst, the preparation method is as follows:

[0061] (1) Get 15 mmoles of 2-aminoterephthalic acid, 15 mmoles of zinc nitrate hexahydrate, 5 mmoles of cobalt nitrate hexahydrate and 1 mmoles of ammonium chloroplatinate, dissolve in 500 milliliters of ethanol, stir at room temperature After 60 min, it was transferred to a stainless steel high-pressure reactor with a polytetrafluoroethylene liner, kept at 180 °C for 6 h, then cooled naturally, and dried in vacuum at 80 °C to obtain a metal-organic framework containing platinum, cobalt and zinc elements Material;

[0062] (2) Put the metal-organic framework material obtained in step (1) in a tube furnace, and perform heat treatment in stages in a hydrogen-nitrogen mixture (hydrogen is 10% by volume). Heat up to 500°C at a heating rate of 1 min, keep warm for 3 hours, then heat up to 1000°C at a heating rate of 10°C / min, keep warm for 1 hour, cool to room tempera...

Embodiment 3

[0064] This embodiment provides a method for preparing an alloy catalyst, the preparation method is as follows:

[0065] (1) Take 20 mmoles of 2-aminoterephthalic acid, 20 mmoles of zinc nitrate hexahydrate, 10 mmoles of cobalt nitrate hexahydrate and 1 mmoles of ammonium chloroplatinate, and dissolve them in 500 ml of N,N-dimethyl In formamide, stirred at room temperature for 60 min, transferred to a stainless steel autoclave lined with polytetrafluoroethylene, kept at 150 °C for 8 h, then cooled naturally, and vacuum-dried at 80 °C to obtain platinum, Metal-organic framework materials of cobalt and zinc elements;

[0066] (2) Put the metal-organic framework material obtained in step (1) in a tube furnace, and carry out heat treatment in stages in a mixed gas of carbon monoxide and nitrogen (the volume ratio of carbon monoxide is 10%). Min heating rate to 400°C, heat preservation for 5h, then heating to 900°C at a heating rate of 10°C / min, heat preservation for 4h, natural c...

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Abstract

The invention provides an alloy catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps of: (1) carrying out solvothermal reaction on ammonium chloroplatinate, cobalt salt, zinc salt, 2-aminoterephthalic acid and a solvent to obtain a metal organic framework material containing platinum, cobalt and zinc elements; and (2) sequentially carrying out primary heating and secondary heating on the metal organic framework obtained in the step (1) in a reducing atmosphere to obtain the alloy catalyst. According to the method, the ammonium chloroplatinate, and a precursor solution of cobalt and zinc are mixed with the 2-aminoterephthalic acid solution,the mixed solution undergoes a reaction to generate the metal organic framework material; and the metal organic framework material is subjected to segmented sintering, so that the alloy catalyst with platinum-cobalt alloy located on a porous carbon carrier can be obtained; the problems of overlarge electrochemical polarization and concentration polarization of the catalyst are solved, the oxygen reduction activity of the catalyst is improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemical materials, and relates to an alloy catalyst and its preparation method and application, in particular to an alloy catalyst for a fuel cell, its preparation method and application. Background technique [0002] Proton exchange membrane fuel cells (PEMFC) is an efficient energy conversion device that can be used in many fields such as transportation power systems, distributed power generation, and mobile devices. Its product is only water. It plays an important role in world environmental pollution and petrochemical energy shortage. The principle of power generation is: the hydrogen at the anode is decomposed into protons and electrons under the action of a catalyst, the protons pass through the proton exchange membrane to the cathode, the electrons reach the cathode through an external circuit, and react with the oxygen at the cathode to form water under the action of the catalyst to comple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92C22C5/04C22C19/07
CPCH01M4/926H01M4/921C22C5/04C22C19/07Y02E60/50
Inventor 张运搏刘冬安程晓草赵玉会苏金权
Owner CHINA AUTOMOTIVE INNOVATION CORP
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