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Self-supported PtCo alloy nanoparticle catalyst and preparation method and application thereof

An alloy nanoparticle, nanoparticle technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of high price, limited platinum reserves, slow methanol oxidation kinetics, etc. Effects of excellent toxicity and durability, high anode current density, and high initial potential

Active Publication Date: 2018-11-02
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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  • Self-supported PtCo alloy nanoparticle catalyst and preparation method and application thereof
  • Self-supported PtCo alloy nanoparticle catalyst and preparation method and application thereof
  • Self-supported PtCo alloy nanoparticle catalyst and preparation method and application thereof

Examples

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] A preparation method similar to that of Example 1 was adopted, except that:

[0055] (1) The time that the carbon cloth is ultrasonically treated in an aqueous solution of acetone is 20 min, 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 In the mixed atmosphere of , where 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 Pt solution was 0.5 mmol / L, and the soaking time was 4 min.

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

Embodiment 3

[0061] A preparation method similar to that of Example 1 was adopted, except that:

[0062] (1) The time that the carbon cloth is ultrasonically treated in an aqueous solution of acetone is 30 min, 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 where 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 Pt solution was 2 mmol / L, and the soaking time was 2 min.

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

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Abstract

The invention relates to a self-supported PtCo alloy nanoparticle catalyst and preparation method and application thereof. The method comprises the steps of synthesizing a three-dimensional self-supported cobalt-based metal organic framework (Co-MOFs) nanorod array structure on a carbon fabric by a liquid phase means, obtaining a three-dimensional porous nitrogen-doped carbon-coated metal cobalt nanoparticle (Co@N-C) nanorod structure by a high-temperature carbon thermal reduction technology, taking the three-dimensional porous nitrogen-doped carbon-coated metal cobalt nanoparticle (Co@N-C) nanorod structure as a template, and finally obtaining a nitrogen-doped carbon / PtCo (PtCo@N-C) porous catalyst by employing a simple potential replacement method according to difference between oxidization-reduction potentials of metal Pt and Co. Compared with the prior art, the composite catalyst does not need a binding agent and a conductive additive, has excellent methanol oxidization and CO toxic resistance, and the flexible carbon fabric substrate is used as a current collector, can be bent and folded and has very high mechanical property.

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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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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