Preparation method of direct methanol fuel cell cathode catalyst

A fuel cell cathode and catalyst technology, applied in battery electrodes, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of uneven particle size dispersion, large Pt catalyst particles, and low utilization rate, and achieve particle size The effect of narrow dispersion, reduced load and resource saving

Inactive Publication Date: 2010-06-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a cathode catalyst for a direct alcohol fuel cell in order to solve the problems of the existing Pt catalyst with large particles, uneven particle size dispersion and low utilization rate.

Method used

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

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specific Embodiment approach 1

[0010] Specific embodiment one: the preparation method of direct alcohol fuel cell cathode catalyst in this embodiment is carried out according to the following reaction: one, the soluble Pt compound is added in the polyhydric alcohol and disperses evenly, the concentration that obtains Pt ion is 0.0001~15mol / L Adjust the pH value of the mixed solution to 8-14; 2. Use an oil bath to heat, and under the condition of 100-180 ℃ and inert gas protection, reduce the mixed solution for 1-6 hours to obtain a colloidal solution; 3. After acidification The treated carbon carrier and polyol are uniformly mixed at a mass ratio of 1:10 to 100 to obtain a carbon carrier slurry; four, the colloidal solution obtained in step 2 is uniformly dispersed into the carbon carrier slurry in step 3, wherein the carbon carrier and The mass ratio of metal Pt is 5:1~4, and the pH value is adjusted to 1~5, then magnetically stirred for 24 hours, then washed with ultrapure water for 3~5 times, and then dri...

specific Embodiment approach 2

[0014] Embodiment 2: This embodiment differs from Embodiment 1 in that: the concentration of Pt ions in the mixed solution in Step 1 is 0.0005˜10 mol / L. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0015] Embodiment 3: This embodiment differs from Embodiment 1 in that the concentration of Pt ions in the mixed solution in Step 1 is 0.005˜5 mol / L. Others are the same as in the first embodiment.

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Abstract

The invention discloses a method for preparing a catalyst used by the cathode of a direct alcohol fuel cell, and relates to a method for preparing the catalyst used by the cathode of the direct alcohol fuel cell. The method solves the problems of the prior Pt catalyst that the particle is large, the particle diameter distribution is not uniform, the utilization rate is low, etc., and comprises the following steps: firstly, a transition metal compound and a Pt compound are dispersed in a polyatomic alcohol, then the pH value is adjusted; secondly, a colloidal solution is obtained by reducing; thirdly, acidified carbon carriers are uniformly dispersed in the polyatomic alcohol, so as to obtain a carbon carrier slurry; and fourthly, the colloidal solution is uniformly dispersed in the carboncarrier slurry, the pH value is adjusted, and then the catalyst can be obtained after being washed and vacuum-dried. The particle size of the product of the invention is 1-3 nm, and the electrochemical specific surface area is 60-110 m<2> / g. The method has the advantages of fine particle size, narrow particle diameter distribution, high catalyst utilization rate and obvious current density improvement, reduces the loading amount of the noble metal catalyst, and decreases the production cost.

Description

technical field [0001] The invention relates to a preparation method of a catalyst for a fuel cell cathode. Background technique [0002] Direct alcohol fuel cells (DMFC or DAFC) directly use methanol or ethanol as fuel. At present, this type of fuel cell needs to solve two problems in the field of basic research: one is to research and develop new proton exchange membranes that prevent or reduce the permeability of alcohols, The second is to improve the activity of the electrode catalyst. The electrochemical reduction activity of direct alcohol fuel cells is not high. When the anode fuel passes through, the polarization is more serious, which is the main reason for its efficiency loss. It is necessary to further improve the activity of the alcohol cathode electrocatalyst and the anti-oxidation of the anode fuel. The ability of the intermediate to be poisoned. At present, the cathode catalyst of direct alcohol fuel cells mainly uses carbon-supported platinum, and other bin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42H01M4/90H01M4/92
CPCY02E60/50
Inventor 王振波王岩左朋建高云智尹鸽平杜春雨程新群
Owner HARBIN INST OF TECH
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