Method for preparing direct methanol fuel cell carbon-carried Pt-based catalyst

A methanol fuel cell and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, battery electrodes, etc., can solve problems such as complicated operation, reduced catalyst performance, and increased risk, and achieve simple, safe, and good operation Effect of Electrocatalytic Methanol Oxidation Activity

Inactive Publication Date: 2009-04-15
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation methods of this kind of catalyst mainly include impregnation reduction method and sol method: (1) impregnation reduction method is to disperse the carrier evenly in a certain solvent such as water, ethanol, isopropanol or a mixture thereof, and select to add a certain precious metal precursor Such as chloroplatinic acid (H 2 PtCl 6 ·H 2 O) or ruthenium trichloride (RuCl 3 ) impregnated into the pores of the carrier, adjusted to a suitable pH value, at a certain temperature with an excess reducing agent such as HCHO, NaBH 4 , ethylene glycol, H 2 etc. are reduced to obtain the required supported catalyst, but the catalyst prepared by this method may cause the particle size to be

Method used

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  • Method for preparing direct methanol fuel cell carbon-carried Pt-based catalyst
  • Method for preparing direct methanol fuel cell carbon-carried Pt-based catalyst
  • Method for preparing direct methanol fuel cell carbon-carried Pt-based catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0022] First, disperse 100 mg of carbon nanotubes treated with nitric acid in 50 ml of twice distilled water, disperse ultrasonically, and add 6.6 mL of 19.3 mmol / LH 2 PtCl 6 Aqueous solution, continue to ultrasonically disperse for 30min, stir magnetically at 70°C to volatilize the solvent water to obtain a dry powder, disperse the obtained dry powder with 30ml ethylene glycol, add an excess of 0.2mol / L NaBH at 60°C 4 The aqueous solution is reduced, centrifuged, washed and dried to obtain a Pt / CNTs catalyst with a loading capacity of 20%.

[0023] figure 1 It is the comparative diagram of the catalytic oxidation of methanol by the 20% Pt / CNTs catalyst prepared in Example 1 and the 20% Pt / C (JM) catalyst produced and sold by Johnson Matthey Company, and the reference electrode is Ag-AgCl. Depend on figure 1 It can be seen that the carbon-supported Pt-based metal catalyst prepared in this example exhibits higher methanol catalytic performance, and the positive sweep current...

Embodiment 2

[0025] This embodiment is the same as embodiment 1 except the following features: add 3.3mL 19.3mmol / L H dropwise 2 PtCl 6 Aqueous solution, the loading capacity is 10% Pt / CNTs catalyst.

Embodiment 3

[0027] This embodiment is the same as embodiment 1 except the following features: add 6.6mL19.3mmol / LH dropwise 2 PtCl 6 and 4.3ml 28.9mmol / LRuCl 3 Aqueous solution, ultrasonic dispersion. A catalyst with a loading of 20%Pt10%Ru / CNTs (Pt:Ru≈1:1) was obtained.

[0028] figure 2 The 20%Pt10%Ru / C (JM) catalyst that is the Pt-Ru / CNTs that embodiment 3 prepares and Johnson Matthey company produces and sells in 1mol / LCH 3 OH+0.5mol / LH 2 SO 4 In the cyclic voltammetry curve, the reference electrode is Ag-AgCl. Depend on figure 2 It can be seen that the Pt-Ru / CNTs catalyst has a higher catalytic methanol oxidation peak current than the commercial catalyst.

[0029] Figure 4 For the XRD curves of the Pt / CNTs prepared in Example 1 and the Pt-Ru / CNTs prepared in Example 3, the diffraction peak of carbon (002) appeared at the 2θ angle of 24.6°. Among them, the (111), (200), (220), (311) crystal plane diffraction peaks of Pt appear in the Pt / CNTs curve at 39.8°, 46.1°, 67.5° a...

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Abstract

The invention discloses a method for preparing a carbon-supported Pt-based catalyst of direct methanol fuel cells. The method comprises the following steps: carbon carriers are dispersed in secondary distilled water; Pt or an aqueous solution of the Pt and other metallic compounds is added to the secondary distilled water and then is subjected to ultrasonic dispersion; solvent water is volatilized through magnetic stirring at a temperature between 60 and 90 DEG C, so as to obtain a dry powder body; and the dry powder body is dispersed by use of glycol, added with a reducing agent at a temperature between 30 and 60 DEG C and reduced, so as to obtain the carbon-supported Pt or Pt-based catalyst. The method has the advantages of simple operation; as the glycol can be used as a solvent as well as a protective agent, the preparation process of the catalyst needs no surfactant, stabilizer, functional molecule and the like; and the method is suitable for industrial scale production.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a method for preparing a carbon-supported Pt-based catalyst for a direct methanol fuel cell. Background technique [0002] Direct methanol fuel cell (DMFC) directly uses methanol as fuel without reforming to obtain hydrogen-rich fuel gas. Methanol has the advantages of abundant sources, cheap price, low toxicity, easy to carry and store, and has high electrocatalytic active. However, the development of direct methanol fuel cells has been troubled by two key problems for a long time: (1) the electrocatalytic performance of the anode for methanol is poor; (2) the permeation of methanol degrades the performance of the cathode. It can be seen that the development of efficient anode electrocatalysts is one of the problems that must be solved in the field of direct methanol fuel cells. So far, Pt-based metal catalysts are mainly able to adsorb and catalyze methanol oxidation at lower temper...

Claims

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Application Information

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IPC IPC(8): B01J23/40H01M4/90H01M4/92
CPCY02E60/50
Inventor 周智慧郭盼盼李伟善
Owner SOUTH CHINA NORMAL UNIVERSITY
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