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A kind of self-supporting ptco alloy nano particle catalyst and its preparation method and application

A technology of alloy nanoparticles and nanoparticles, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of high price, limited platinum reserves, slow methanol oxidation kinetics, etc., and reach the anode High current density, excellent toxicity resistance and durability, and high initial potential

Active Publication Date: 2021-09-03
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among many electrocatalysts, platinum and platinum-based alloys are still the most effective and stable catalysts in methanol oxidation. However, platinum reserves are limited and expensive, which greatly limits its large-scale commercial application.
In addition, the catalytic performance of platinum is also limited by its slow methanol oxidation kinetics and CO poisoning.

Method used

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  • A kind of self-supporting ptco alloy nano particle catalyst and its preparation method and application
  • A kind of self-supporting ptco alloy nano particle catalyst and its preparation method and application
  • A kind of self-supporting ptco alloy nano particle catalyst and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of a self-supporting PtCo alloy nanoparticle catalyst, comprising the following steps:

[0029] Fabrication of Co-MOFs nanorod arrays on carbon cloth

[0030] First choose carbon cloth as the base, model: WOS1002. The carbon cloth was put into acetone and deionized water for ultrasonic treatment for 20 minutes, and finally rinsed with deionized water and put into a blast drying oven for drying.

[0031] Configure Co-MOFs precursor solution: 40ml 25mM cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) quickly added to 40ml of 0.4M dimethylimidazole (C 4 h 6 N 2 ) in an aqueous solution, and then stirred.

[0032] At 30° C., soak the treated carbon cloth in the Co-MOFs precursor solution for 4 hours to react. Then rinse with deionized water.

[0033] Repeat the above steps to grow Co-MOFs for the second time under the same temperature and reaction time.

[0034] Fabrication of Co@N-C Nanorod Arrays on Carbon Cloth

[0035] The Co-MOFs nanorod array prepa...

Embodiment 2

[0054] Adopt the preparation method similar to embodiment 1, difference is:

[0055] (1) The carbon cloth is ultrasonically treated in an aqueous solution of acetone for 20 minutes, and the drying temperature of the carbon cloth is 60°C;

[0056] (2) The molar ratio of cobalt nitrate and dimethylimidazole in the precursor solution is 1:15.

[0057] (3) Calcined in Ar and H 2 Carried out in a mixed atmosphere, wherein Ar accounts for 90% of the total gas volume; the calcination temperature is 700°C, and the calcination time is 4h;

[0058] (4) H used for soaking 2 PtCl 4 The concentration of the Pt solution was 0.5mmol / L, and the soaking time was 4min.

[0059] The catalyst prepared in this example is used in the anode of the methanol fuel cell, and it is found through testing that it has a large current density and has good CO poisoning performance.

Embodiment 3

[0061] Adopt the preparation method similar to embodiment 1, difference is:

[0062] (1) The carbon cloth is ultrasonically treated in an aqueous solution of acetone for 30 minutes, and the drying temperature of the carbon cloth is 80°C;

[0063] (2) The molar ratio of cobalt nitrate and dimethylimidazole in the precursor solution is 1:-20.

[0064] (3) Calcined in Ar and H 2 It is carried out in a mixed atmosphere, wherein Ar accounts for 90% to 95% of the total gas volume; the calcination temperature is 900°C, and the calcination time is 2h;

[0065] (4) H used for soaking 2 PtCl 4 The concentration of the Pt solution was 2mmol / L, and the soaking time was 2min.

[0066] The catalyst prepared in this example is used in the anode of the methanol fuel cell, and it is found through testing that it has a large current density and has good CO poisoning performance.

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Abstract

The invention relates to a self-supporting PtCo alloy nanoparticle catalyst and its preparation method and application. The specific method is to synthesize a three-dimensional self-supporting cobalt-based metal-organic framework (Co-MOFs) nanorod array structure on a carbon cloth by means of a liquid phase. A three-dimensional porous nitrogen-doped carbon-coated cobalt nanoparticle (Co@N‑C) nanorod structure was obtained by high-temperature carbothermal reduction technology, and this was used as a template to utilize the difference in the redox potential of metal Pt and Co to adopt a simple Nitrogen-doped carbon / PtCo (PtCo@N‑C) porous catalyst was finally obtained by the electroporation reaction method. Compared with the prior art, the composite catalyst of the present invention does not require binders and conductive additives, and has excellent methanol oxidation performance and CO toxicity resistance. The flexible carbon cloth substrate is used as a current collector, which is bendable and foldable, and has very good mechanical properties .

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a self-supporting PtCo alloy nanoparticle catalyst and a preparation method and application thereof. Background technique [0002] As a high-efficiency energy conversion device, fuel cells have the potential of low cost and zero emission, and are considered to be an important way to solve human's growing energy crisis and environmental pollution problems. However, methanol has the advantages of high commercialization, high specific energy, and good portability. Therefore, direct methanol fuel cells have very promising application prospects and have attracted widespread attention. Among many electrocatalysts, platinum and platinum-based alloys are still the most effective and stable catalysts in methanol oxidation. However, the limited reserves and high price of platinum greatly limit its large-scale commercial application. In addition, the catalytic performance of platinum is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92H01M4/88H01M8/1011B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/885H01M4/921H01M4/926H01M8/1011Y02E60/50
Inventor 程传伟任伟娜张海峰
Owner TONGJI UNIV
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