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Method for preparing catalyst in direct use for methanol fuel cells

A methanol fuel cell and catalyst technology, applied in catalyst activation/preparation, catalyst carrier, chemical instruments and methods, etc., can solve problems such as difficult catalysts

Inactive Publication Date: 2005-08-31
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pt, Ru precursors with H 2 PtCl 6 and RuCl 3 Mainly, with formaldehyde as the reducing agent; due to the reduction of H by formaldehyde 2 PtCl 6 and RuCl 3 The intermediate product HCOOH will be generated, causing the pH value of the reducing solution to drop rapidly, reducing the H 2 PtCl 6 and RuCl 3 Coarse Pt-Ru alloy particles are formed, so it is difficult to make a catalyst with high activity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0004] Specific Embodiment 1: This embodiment consists of the following steps: 1. Put the carbon carrier in water vapor with a pressure of 0.1-1.5 MPa for 3-12 hours, take it out and dry it in vacuum; 2. Put the carbon carrier after the above treatment Add to deionized water and isopropanol solution, disperse evenly, the volume ratio of deionized water and isopropanol is 1:1; 3. Add the precursors of Pt and Ru to the uniformly dispersed carbon-containing slurry to make Pt The precursors of Pt and Ru are uniformly dispersed on the carbon support, and the precursors of Pt and Ru are H 2 PtCl 6 and RuCl 3 ; 4. Use a buffer solution to adjust the pH value of the uniformly dispersed carbon carrier, Pt and Ru precursor slurry to 7-10; A Pt-Ru / C catalyst is prepared; in this embodiment, the carbon carrier is VulcanXC-72 carbon powder from Cabot Company.

specific Embodiment approach 2

[0005] Embodiment 2: The difference between this embodiment and Embodiment 1 is that it also includes the following steps: 6. Repeatedly washing the Pt-Ru / C catalyst with deionized water with a temperature of 60-90°C to remove Cl - ions; 7. The obtained Pt-Ru / C catalyst was vacuum-dried at 80-100° C. for 3-6 hours.

specific Embodiment approach 3

[0006] Specific embodiment three: the difference between this embodiment and embodiment one is: buffer solution selects acetate-sodium hydroxide, citrate-sodium hydroxide, carbonate-sodium bicarbonate, tartrate in step 4 - Sodium Hydroxide or Diamine Tetraacetate - Sodium Hydroxide.

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PUM

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Abstract

The method includes following steps: carbon carrier is put in vapor under pressure 0.1-1.5MPa for process for 3-12 hours, fetching out carbon carrier dried in vacuum; adding processed carbon carrier into deionized water and isopropyl alcohol solution and dispersing them evenly; adding predecessors of Pt and Ru into evenly dispersed serum containing carbon, making predecessors of Pt and Ru disperse on carbon carrier evenly, predecessor of Pt and Ru are H2PtCl6 and RuCl3 respectively; adjusting pH value of the said serum to 7-10 by using buffer solution; then, heating up the obtained serum to 70-90 deg.C; Pt-Ru / C catalyst is prepared after 1-5 hours deoxidization through added deoxidiser. Advantages are: 3-5nm smaller granules of catalyst and even dispersion.

Description

Technical field: [0001] The invention relates to a preparation method of an anode Pt-Ru / C catalyst for a direct methanol fuel cell. Background technique: [0002] Direct Methanol Fuel Cell (DMFC) uses liquid or gaseous methanol as fuel, without external reforming equipment, and has the advantages of high energy conversion efficiency, no pollution, no noise, simple system structure, high energy density, and convenient fuel portability and replenishment. It is especially suitable for As a portable power supply and as a power supply on vehicles, it has attracted much attention. The research of direct methanol fuel cells is currently mainly focused on the research of anode catalysts and alcohol-resisting polymer electrolyte membranes; the electrochemical oxidation activity of DMFC at low temperature is not high, and the polarization is serious, which is the main reason for its efficiency loss. Further improve the activity of methanol anode electrocatalyst. The Pt-Ru binary cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/40B01J32/00B01J37/00H01M4/88H01M4/92
CPCY02E60/50
Inventor 尹鸽平王振波史鹏飞程新群杜春雨王丹
Owner HARBIN INST OF TECH