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Platinum/carbon-based nano composite material, and preparation method and application thereof

A technology of carbon-based nanometers and carbon-based materials, which is applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems that cannot meet the needs of large-scale application of fuel cells and limit the scale of supported platinum catalysts Production and other issues, to achieve the effect of good industrial prospects, easy access, and strong applicability

Active Publication Date: 2014-12-10
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These processing conditions limit the large-scale production of supported platinum catalysts
[0005] It can be seen that the existing technology cannot meet the needs of large-scale application of fuel cells

Method used

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  • Platinum/carbon-based nano composite material, and preparation method and application thereof
  • Platinum/carbon-based nano composite material, and preparation method and application thereof
  • Platinum/carbon-based nano composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1, Pt / CNH nanocomposite material (PCNb-20) and its electrocatalytic performance test

[0050] 1) Ultrasonic disperse CNH in ethylene glycol, dissolve sodium hydroxide in ultrapure water, and mix the two evenly. Add 1.96g / L ethylene glycol solution of chloroplatinic acid hexahydrate under stirring, mix well, and then ultrasonically disperse for 30 minutes to obtain CNH concentration of 0.5g / L, chloroplatinic acid hexahydrate concentration of 0.392g / L, volume of alcohol and water A suspension with a ratio of 9:1 has a pH ~12.

[0051] 2) Transfer the mixed liquid to the irradiation tube, pass argon gas for 15 minutes to remove the oxygen in the system, and seal the tube mouth 60 Coγ-rays were irradiated at room temperature with a dose rate of about 25Gy min -1 , The absorbed dose is 25kGy.

[0052] 3) After the irradiation, the sample is filtered through a polypropylene (PP) membrane with a pore size of 0.45 μm. The filtered filter cake is rinsed with ultrapur...

Embodiment 2

[0055] Example 2, Pt / CNH nanocomposite material (PCNb-5) and its electrocatalytic performance test

[0056] Consistent with the preparation method in Example 1, step 1) was changed to: ultrasonically disperse CNH in ethylene glycol, dissolve sodium hydroxide in ultrapure water, and mix the two evenly. Add 1.96g / L ethylene glycol solution of chloroplatinic acid hexahydrate under stirring, mix well, and then ultrasonically disperse for 30 minutes to obtain CNH concentration of 0.5g / L, chloroplatinic acid hexahydrate concentration of 0.098g / L, volume of alcohol and water A suspension with a ratio of 9:1 has a pH ~12.

[0057] After obtaining the Pt / CNH nanocomposite material in the form of black fluffy powder, the platinum loading in the composite material was measured by ICP-AES and TGA to be 5 wt%, and the sample was named PCNb-5.

[0058] Consistent with the electrocatalytic performance test method in Example 1, the performance of the PEMFC single cell using the PCNb-5 nanoco...

Embodiment 3

[0060] Example 3, Pt / CNH nanocomposite material (PCNa-20) and its electrocatalytic performance test

[0061] Consistent with the preparation method of Example 1, step 1) is changed to: ultrasonically disperse CNH in ethylene glycol, add 1.96g / L ethylene glycol solution of chloroplatinic acid hexahydrate under stirring, mix well, and then ultrasonically disperse After 30 minutes, a suspension with a CNH concentration of 0.5 g / L and a chloroplatinic acid hexahydrate concentration of 0.392 g / L was obtained, and its pH was ~4.

[0062] After obtaining the Pt / CNH nanocomposite material in the form of black fluffy powder, the platinum loading in the composite material was measured to be 20 wt% by ICP-AES and TGA, and the sample was named PCNa-20.

[0063] 5) Consistent with the electrocatalytic performance test method of Example 1, the performance of the PEMFC single cell using the PCNa-20 nanocomposite material as the electrocatalyst was measured. Platinum loading per unit area is...

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Abstract

The invention discloses a platinum / carbon-based nano composite material, and a preparation method and application thereof. The preparation method comprises the following steps: with radiation of gamma rays or electron beams, inducing reduction of a platinum metal precursor, and simultaneously, carrying out irradiating modification on single-wall carbon nanohorn or a mixed carbon material of single-wall carbon nanohorn and oxidized graphite, thereby obtaining the platinum / carbon-based nano composite material with the platinum loading amount being 0.5wt%-50wt%. The platinum / carbon-based nano composite material can be used as an electric catalyst of a proton exchange membrane fuel cell.

Description

technical field [0001] The invention relates to a platinum / carbon-based nanocomposite material and its preparation method, as well as its application as a proton exchange membrane fuel cell catalyst. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) directly converts chemical energy into electrical energy without going through the Carnot cycle, and is considered to be the most valuable green energy technology. The basic structure of its single cell is composed of anode, cathode and proton exchange membrane, plus a catalyst layer and a gas diffusion layer to form the core component, namely the membrane electrode assembly (MEA). The advantages of PEMFC are: no pollution, simple structure, use at room temperature, high volume and weight ratio energy density, long life, and has good application prospects in the fields of national defense, energy, environmental protection, and communications. [0003] The core problem of the large-scale practical applicati...

Claims

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Application Information

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IPC IPC(8): B01J23/42H01M4/92
CPCY02E60/50
Inventor 翟茂林张琦璐彭静敖银勇蔡晓生李久强
Owner PEKING UNIV
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