Preparation method for direct methanol fuel cell supported Pt-based anode catalyst

A methanol fuel cell, load-type technology, applied in the direction of battery electrodes, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of difficult polymerization reaction conditions, excessive particle size, weak electron conductivity, etc., and meet the conditions Good controllability, simple process, and the effect of improving dispersion

Inactive Publication Date: 2013-01-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the need to add graphene materials in the polymerization liquid at the same time, the viscosity of the polymerization liquid changes, resulting in more difficult control of the polymerization reaction conditions, and it is easy for the polymer to only aggregate on the modified conductive polymer or small organic molecules on graphite. A certain point or a large number of ene sheets are stacked at the edge of the graphene sheet
When the modified graphene is used as the carrier, and the conductive polymer or organic small molecule is used as the site to anchor the platinum catalyst, the spatial distribution and particle size of the metal particles are uneven and the particle size is too large (about 6nm).
Conductive polymers have a weaker ability to conduct electrons than graphene materials. When graphene sheets are completely covered by conductive polymers, it will affect the transfer of electrons in the carbon six-membered ring, reducing the conductivity and other excellent properties of the catalyst carrier. leading to a decrease in the performance of the entire electrocatalyst
In the above method, graphene and polymer monomer need to be dissolved in alkaline aqueous solution at the same time, so it is not suitable for polymer modification and modification of polymerization reaction under acidic conditions, which makes the preparation method narrow in scope and not suitable for use. suitable for large-scale applications

Method used

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  • Preparation method for direct methanol fuel cell supported Pt-based anode catalyst
  • Preparation method for direct methanol fuel cell supported Pt-based anode catalyst
  • Preparation method for direct methanol fuel cell supported Pt-based anode catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Add 0.1g of 5-20nm graphene microchips into 100ml of deionized water, sonicate for 2 hours in a cell pulverizer, and filter through a filter membrane; the graphene obtained after filtration is dissolved in 200ml of N-methylpyrrolidone, magnetically stirred at room temperature for 3 minutes, and ultrasonicated for 2 hours. Obtain the dispersion liquid of graphene; 2.04mg polyaniline joins 10mlN-methylpyrrolidone solvent; Obtain the N-methylpyrrolidone solution of polyaniline, mix the N-methylpyrrolidone solution of 200ml graphene dispersion liquid and 10ml polyaniline, Stir magnetically for 24 hours; filter with a filter membrane, dissolve the filter cake in a mixed solution of 50ml deionized water and 300ml ethylene glycol, stir, ultrasonicate for 1 hour, add 13.06ml of 0.1M chloroplatinic acid solution, and wait until the temperature rises to 125°C, react for 4h. Lower the temperature to room temperature, filter, and wash the filter cake with deionized water and ethano...

Embodiment 2

[0021] The other conditions of this example are the same as those of Example 1, except that the 5-20 nm graphene microflakes are changed to 1-5 nm graphene nano-sheets to obtain a Pt / polyaniline-graphene catalyst with a particle size of 2-3 nm. Take 3 mg of the catalyst and dissolve it in ethanol and Nafion solvent, and then apply it on carbon paper as an anode. At a potential of 0-1.24 V and a scan rate of 10 mV / s, the cyclic volts of methanol oxidation were measured by a simulated fuel cell. The safety curve diagram is attached figure 1 and attached figure 2 As shown, it can be seen from the figure that the performance of the catalyst of the present invention is significantly better than that of the catalysts prepared in Comparative Example 1 and Comparative Example 2.

Embodiment 3

[0023] Dissolve 0.1g of 1-5nm graphene nanosheets in 100ml of deionized water, sonicate for 2 hours in a cell pulverizer, and filter; dissolve the obtained graphene in 200ml of N-methylpyrrolidone, stir mechanically, and ultrasonically for 2 hours, add 25mg of polyaniline to 10ml of N -In the methylpyrrolidone solution, mix 200ml of the dispersion with 10ml of the N-methylpyrrolidone solution of polyaniline, stir for 12 hours; filter, and dissolve the filter cake in a 1:4 mixed solution of deionized water and ethylene glycol, Stir and sonicate, add 16ml of chloroplatinic acid with a concentration of 0.1M, wait until the temperature rises to 125°C, and react for 4h. The temperature was lowered to room temperature, the precipitate was washed with deionized hydrated ethanol, filtered, and vacuum-dried at 75° C. to obtain a Pt / polyaniline-graphene catalyst with a particle size of 2-3 nm. Take 3 mg of the catalyst and dissolve it in ethanol and Nafion solvent, and then apply it on ...

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Abstract

The invention discloses a preparation method for a direct methanol fuel cell supported Pt-based anode catalyst. The preparation method comprises the following steps: adding graphene to N-methyl pyrrolidinone to prepare dispersion liquid; preparing polyaniline to be N-methyl pyrrolidinone solution in a mass ratio of the graphene to the polyaniline; mixing the dispersion liquid with the polyaniline solution, filtering the mixture; dissolving the filter cake to deionized water and solvent of ethylene glycol; adding chloroplatinic acid to the solution of the filter cake in the total mass ratio of Pt to graphene and polyaniline; and acquiring the direct methanol fuel cell supported Pt-based anode catalyst with the grain size of 2-3 nm by reacting, filtering, washing and drying. The preparation method has the advantages of a simple process, good controllability of conditions during the process, improving the dispersion of the graphene, the distribution uniformity of the Pt catalyst in the graphene space and the stability of the catalyst. As shown by the test, the catalyst has excellent performances.

Description

[0001] technical field [0002] The invention relates to a preparation method of a direct methanol fuel cell loaded Pt-based anode catalyst, which belongs to the direct methanol fuel cell anode catalyst technology. Background technique [0003] Direct methanol fuel cell (DMFC) is a new type of environmentally friendly power generation device that directly converts chemical energy into electrical energy. Its outstanding advantages are abundant sources of methanol, cheap price, and its aqueous solution is easy to carry and store. Therefore, the direct methanol fuel cell is particularly suitable as a mobile power source for various purposes. The anode electrocatalyst is the core component of the direct methanol fuel cell, and its performance directly affects the performance of the fuel cell. The DMFC anode uses a supported catalyst. At present, the research direction of DMFC anode catalyst mainly focuses on using graphene material as the carrier to improve the spatial distr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06H01M4/92H01M4/88
CPCY02E60/50
Inventor 黄成德张雪苹米南
Owner TIANJIN UNIV
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