Methanol electrooxidation catalyst and preparation method and application thereof

A catalyst and electro-oxidation technology, applied in circuits, electrical components, battery electrodes, etc., to achieve high activity and stability

Active Publication Date: 2018-03-30
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on Pt-based catalysts modified by nanoscale controllable nitrogen-containing carbon films.

Method used

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  • Methanol electrooxidation catalyst and preparation method and application thereof
  • Methanol electrooxidation catalyst and preparation method and application thereof
  • Methanol electrooxidation catalyst and preparation method and application thereof

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Experimental program
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Effect test

preparation example Construction

[0026] The invention provides a kind of preparation method of methanol electrooxidation catalyst, comprising the following steps:

[0027] (1) coating the dispersion of carbon nanomaterials on the surface of the substrate to obtain a template;

[0028] (2) depositing a nitrogen-containing organic polymer film and Pt nanoparticles on the surface of the template in the step (1) by atomic layer deposition to obtain a catalyst precursor;

[0029] (3) Under a protective atmosphere, the catalyst precursor in the step (2) is heat-treated to obtain a methanol electro-oxidation catalyst.

[0030] In the invention, the dispersion liquid of the carbon nanometer material is coated on the surface of the substrate to obtain a template. In the present invention, the carbon nanomaterial preferably includes carbon nanotubes, carbon fibers, carbon spheres or graphene. In the present invention, there is no special limitation on the source of the carbon nanomaterials, and commercially available...

Embodiment 1

[0052] 1) Coating the ethanol dispersion of carbon nanotubes with a concentration of 0.01g / mL on the surface of a glass sheet, and evaporating to dryness to obtain a template, the thickness of the cured film on the surface of the template is 1.0mm;

[0053] 2) Utilize atomic layer deposition to deposit Pt nanoparticles on the surface of the template:

[0054] The set deposition parameters are: the reaction temperature is 220°C, the pressure is 70Pa, the temperature of the reaction source trimethylcyclopentadiene platinum is 70°C, the oxygen temperature is 30°C, and the nitrogen flow rate is 50mL / min;

[0055] Pulse trimethylcyclopentadiene platinum vapor first, the pulse time is 0.5s, the hold time is 8s, and the purge time is 20s; then pulse oxygen, the pulse time is 1s, the hold time is 8s, and the purge time is 20s , thus completing one deposition cycle, repeating this process for 20 cycles to obtain a sample of carbon nanotube-loaded Pt nanoparticles, denoted as Pt / CNT;

...

Embodiment 2

[0067] The methanol electrooxidation catalyst was prepared according to the method of Example 1, wherein, when depositing Pt nanoparticles, the number of deposition cycles was 50 cycles.

[0068] According to the method of Example 1, the methanol electrooxidation activity and stability of the prepared methanol electrooxidation catalyst were tested, and the test results showed that the current density of methanol oxidation on C-Pt / CNT was 0.8A / mg Pt , respectively Pt / CNT (0.46A / mg Pt ), commercial Pt / C (0.28A / mg Pt ) of 1.7 and 2.8 times. After 3600s stability test, the current density of methanol oxidation on C-Pt / CNT is 0.16A / mg Pt , respectively Pt / CNT (0.012A / mg Pt ), commercial Pt / C (0.01A / mg Pt ) 13.3 times and 16 times.

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Abstract

The invention provides a methanol electrooxidation catalyst preparation method. The preparation method comprises the steps that dispersion liquid of carbon nano-material is coated on the surface of asubstrate to obtain a template, a nitrogen-containing organic polymer film and a Pt nano-particle are deposited on the surface of the template by using an atomic layer deposition method so as to obtain a catalyst precursor, and the catalyst precursor is subjected to heat treatment under a protective atmosphere to obtain a methanol electrooxidation catalyst. According to the methanol electrooxidation catalyst preparation method, the nitrogen-containing organic polymer film and the Pt nano-particle are deposited on a carbon carrier by using the atomic layer deposition method, the nitrogen-containing organic polymer film is carbonized into a conductive nitrogen-containing carbon film after being subjected to heat treatment, and compared with a pure Pt catalyst, the methanol electrooxidation catalyst shows higher activity and stability in the methanol electrocatalytic oxidation process; and meanwhile, the methanol electrooxidation catalyst preparation method is simple and controllable, content and sizes of all components are convenient to accurately adjust, product preparation uniformity is good, and repeatability is high.

Description

technical field [0001] The invention relates to the technical field of catalytic materials, in particular to a methanol electrooxidation catalyst and its preparation method and application. Background technique [0002] With the rapid development of society and the rapid growth of human dependence and demand on energy, traditional mineral energy will be exhausted in the near future. At the same time, the use of fossil fuels produces a large amount of pollutants, causing great damage to the environment. Therefore, in the process of developing and utilizing new energy, green and environmental protection are the basic conditions that it should meet. A fuel cell is an electrochemical device that uses fuel as a reactant, and through a series of chemical reactions, converts chemical energy directly into electrical energy without any other form of energy conversion in between, and has high energy conversion efficiency. Moreover, the fuel used by the fuel cell is low in cost, non-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/06C23C16/34C23C16/455C23C16/56H01M4/92
CPCC23C16/06C23C16/347C23C16/45525C23C16/56H01M4/926Y02E60/50
Inventor 覃勇杨慧敏张佰艳
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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