Preparation method of catalyst for cathode of direct methanol fuel cell

A methanol fuel cell and catalyst technology, applied in battery electrodes, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low battery output power, low cathode activity, poor selectivity, etc., and achieve good stability and cost Effect of low and high methanol resistance and stability

Inactive Publication Date: 2010-02-24
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The problem to be solved by the present invention is the problems of low activity, poor selectivity, serious polarization and low battery output power of the existing direct methanol fuel c...

Method used

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  • Preparation method of catalyst for cathode of direct methanol fuel cell
  • Preparation method of catalyst for cathode of direct methanol fuel cell
  • Preparation method of catalyst for cathode of direct methanol fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Add 40ml of ethylene glycol into the reactor, pass nitrogen for 30min, then add 0.2mmol CoCl 2 ·6H 2 O. 200mg polyvinylpyrrolidone (PVP), stirring at 85°C and continuing to feed nitrogen, then adding a concentration of 0.3mol L -1 , with 1mol L -1 NaOH aqueous solution adjusts 0.2ml of hydrazine hydrate solution with a pH value of 13, and the dropping rate is 40 drops·min -1 , continue stirring and reacting for 35min to obtain Co nano catalyst sol, and then filter to obtain Co nanoparticles;

[0021] 2) Re-dissolve the Co nanoparticles in the above step (1) in 80ml of ethylene glycol, add 40mg of polyvinylpyrrolidone (PVP) under stirring, and then add 0.0386mol L -1 H 2 PtCl 6 Solution 1.28ml, continue to stir at 60°C, then add 20 drops·min -1 Dropping at a rate of 1mol·L -1 NaOH ethylene glycol solution adjusts the pH value to 13 and the concentration to 0.1mol L -1 0.47ml of hydrazine hydrate solution, the molar ratio of hydrazine hydrate to platinum atom i...

Embodiment 2

[0024] 1) Add 100ml ethylene glycol into the reactor, pass nitrogen for 30min, then add 3.0mmol CoCl 2 ·6H 2 O, 1000mg polyvinylpyrrolidone (PVP), stirring at 65°C and continuing to feed nitrogen, then adding a concentration of 0.3mol L -1 , with 1mol L -1 NaOH aqueous solution adjusts 5ml of hydrazine hydrate solution whose pH value is 13, and the dropping rate is 40 drops·min -1 , continue to stir and react for 60min, prepare Co nano catalyst sol, and then filter to obtain Co nanoparticles;

[0025] 2) Re-dissolve the Co nanoparticles in the above (1) in 80ml of ethanol, add 250mg of polyvinylpyrrolidone (PVP) under stirring, and then add 0.0386mol L -1 H 2 PtCl 6 Solution 9.6ml, continue to stir at 70°C, then add 30 drops·min -1 Dropping at a rate of 1mol·L -1 NaOH ethylene glycol solution adjusts the pH value to 13 and the concentration to 0.1mol L -1 9.3ml of hydrazine hydrate solution, the molar ratio of hydrazine hydrate to platinum atoms is 2.5:1, and the stirr...

Embodiment 3

[0028] 1) Add 100ml of water into the reactor, pass nitrogen for 30min, then add 1.0mmol CoCl 2 ·6H 2 O, 500mg polyvinylpyrrolidone (PVP), stirring at 65°C and continuing to feed nitrogen, then adding a concentration of 0.3mol L -1 , with 1mol L -1 NaOH aqueous solution adjusts 1.7ml of hydrazine hydrate solution whose pH value is 13, and the dropping rate is 40 drops·min -1 , continue to stir and react for 60min, prepare Co nano catalyst sol, and then filter to obtain Co nanoparticles;

[0029] 2) Re-dissolve the Co nanoparticles in the above (1) in 80ml of ethanol, add 250mg of polyvinylpyrrolidone (PVP) under stirring, and then add 0.0386mol L -1 H 2 PtCl 6 Solution 12.8ml, continue to stir at 70°C, then add 30 drops.min -1 Dropping at a rate of 1mol·L -1 NaOH ethylene glycol solution adjusts the pH value to 13 and the concentration to 0.1mol L -1 12.4ml of hydrazine hydrate solution, the molar ratio of hydrazine hydrate to platinum atom is 2.5:1, continue to stir a...

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Abstract

The invention provides a preparation method of catalyst for the cathode of a direct methanol fuel cell, comprising the following steps: adding solvent into a reactor; adding with nitrogen; adding withM-salt and stabilizing agent in proportion; dropwise adding with reducing agent; reacting to prepare M nanometer catalyst solution; vacuuming and filtering to obtain M nanometer particles; dissolvingthe M nanometer particles into the solvent and stirring; adding with platinum base compound and stabilizing agent; ultrasonically stirring; adding with hydrazine hydrate solution and reacting; preparing black nanometer catalyst solution; separating and washing; and vacuum drying to obtain black powdered M-Pt core-shell structure nanometer particles catalyst. By using the characteristics that thenoble metal has higher catalytic activity to oxygen reduction and the transition metal has a special electronic structure, the method uses the transition metal with more d belt electron holes and lower electron negativity as core to prepare M-noble metal core shell structure nanometer particles which are used for oxygen electrode reduction catalyst of the direct methanol fuel cell, wherein the catalyst has higher oxygen reduction activity, methyl alcohol resistibility and stability, and the preparation method is simple and is low in cost.

Description

technical field [0001] The invention relates to a method for preparing a methanol fuel cell cathode catalyst, in particular to a method for preparing a catalyst M-Pt core-shell structure nanometer catalyst for a direct methanol fuel cell cathode. Background technique [0002] Direct methanol fuel cell (DireCt Methanol Fuel Cell, DMFC) has the advantages of high power density, high energy conversion efficiency, and fuel portability and easy storage. It is an ideal portable and mobile energy source, although direct methanol fuel cell DMFC has developed For more than thirty years, the direct methanol fuel cell DMFC is still facing a serious technical problem in the use process - "methanol breakthrough" problem, that is, methanol diffuses from the anode through the electrolyte membrane to the cathode, and in the cathode Pt / C catalyst On the other hand, oxygen reduction and methanol oxidation react simultaneously to produce a "mixed potential", which seriously reduces the output ...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/92B01J23/89
CPCY02E60/50
Inventor 刘世斌张忠林梅艳段东红武爱莲郝晓刚
Owner TAIYUAN UNIV OF TECH
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