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Method for preparing direct methyl alcohol fuel cell nano electric catalyst

A methanol fuel cell and electrocatalyst technology, applied in battery electrodes, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of complex organic phase removal, cumbersome methods, and environmental pollution

Inactive Publication Date: 2003-12-10
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is cumbersome and has strict requirements on conditions such as temperature, solution concentration, pH value, and reaction time.
(4) Metal cluster synthesis [Schmidt, M.Noeske, H.A.Gasteiger, R.J.Behm, J.Electrochem.Soc., Vol.145, No.3, March 1998], that is, the metal and the reducing agent are in an appropriate organic phase Metal clusters are obtained by reaction, and then adsorbed by a carrier. This method can obtain catalyst particles with a smaller particle size, but the reaction conditions are harsh, and the removal of the organic phase is also complicated.
The preparation of catalysts by the above preparation methods will cause certain pollution to the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Embodiment 1: adding chloroplatinic acid to 50ml volume ratio is the methylene chloride / [BMI]BF of 0.5:1 4 In the mixed solvent, the platinum content was 2g / L, stirred at room temperature for 0.5 hour, and 0.1g of activated carbon was added to the mixed solution. Stirring was continued for 2 hours, and then the volatile solvent was pumped off for one hour at 75° C. under a pressure of 0.1 bar. Continuously fed hydrogen is used as the reducing agent, and the reduction temperature is 75°C. The temperature was lowered to room temperature, centrifuged, separated, and the precipitate was washed with acetone and dichloromethane; dried under reduced pressure to obtain a platinum / carbon electrocatalyst with a particle size of 3±0.5 nm. Methanol oxidation polarization curves measured from the half-cell show that its performance is superior to that of the corresponding electrocatalyst from E-TEK.

Embodiment 2

[0007] Embodiment 2: other conditions are the same as embodiment 1, only change the ethanol / [BMI] BF that organic solvent is 1: 1 4 In the mixed solvent, add potassium chloroplatinate to make the platinum content 4g / L. Using the mixed gas of hydrogen and nitrogen fed continuously as the reducing agent, the volume ratio of the mixed gas is: hydrogen / nitrogen 80:20, and the reduction temperature is 85° C. to obtain a platinum / carbon electrocatalyst with a particle size of 3±0.5 nanometers. Methanol oxidation polarization curves measured from the half-cell show that its performance is superior to that of the corresponding electrocatalyst from E-TEK.

Embodiment 3

[0008] Embodiment 3: other conditions are the same as embodiment 1, only change the dichloromethane / [EMI]BF that organic solvent is 2: 1 4 Add sodium chloroplatinate to the mixed solvent to make the platinum content 5g / L. Using the mixed gas of hydrogen and nitrogen fed continuously as the reducing agent, the volume ratio of the mixed gas is: hydrogen / nitrogen 90:10, and the reduction temperature is 100°C to obtain a platinum / carbon electrocatalyst with a particle size of 3±0.5 nanometers. Methanol oxidation polarization curves measured from the half-cell show that its performance is superior to that of the corresponding electrocatalyst from E-TEK.

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Abstract

The present invention respectively uses water soluble platinum chloride, ruthenium chloride or bromide and non-water-soluble platinum ruthenium olefine complex as raw material, in which the mole ratio of platinum and ruthenium is 1:0.5-1, its organit solvent is acetone, ethyl alcohol or dichloromethane, the volume ratio of organic solvent and ion liquid is 0.5-2:1, its adopted ion liquid is water soluble or non-water-soluble, and the content of noble metal in the organic solution is 2-10 g / L, then the active carbon can be added to make adsorption, then the above-mentioned materials are stirred, the pure hydrogen gas or hydrogen gas and nitrogen gas mixed gas is introduced to make reduction, and then the above-mentioned material is centrifugatized, washed with organic solvent and dried.

Description

technical field [0001] The invention belongs to the preparation method of nano electrocatalyst of direct methanol fuel cell. Background technique [0002] 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. At present, the preparation methods of carbon-supported noble metal catalysts are mainly divided into the following types: (1) impregnation method [J.B.Goodenough, A.Hamnett, B.J.Kemmedy, etal.Electrochimica Acta, 15 (1990) 199-207], which is to prepare supported metal catalysts The most commonly used method is to directly use the metal salt solution as the impregnation solution, and use different methods to reduce the platinu...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J23/40H01M4/88H01M4/92
CPCY02E60/50
Inventor 邢巍薛新忠刘长鹏陆天虹
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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