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Method for preparing Pt-Ru/C catalyst in use for direct methanol fuel cell

A methanol fuel cell and catalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, catalyst carrier, etc., can solve the problems of high price and difficult preparation of precursors

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

With Pt(NH 3 ) 4 Cl 2 , Pt(NH 3 ) 2 (NO 2 ) 2 and Ru(NH 3 ) 4 Cl 2 For the precursor, ion exchange or electrochemical reduction can be used to prepare catalysts with smaller particle size and higher catalytic activity; but Pt(NH 3 ) 4 Cl 2 , Pt(NH 3 ) 2 (NO 2 ) 2 and Ru(NH 3 ) 4 Cl 2 It is difficult to prepare such precursors, and the price is very expensive

Method used

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Effect test

specific Embodiment approach 1

[0004] Specific embodiment one: the method of this embodiment is realized through the following steps: 1. The carbon carrier is processed as follows: 1. the carbon carrier is placed in high-pressure steam for 3-12 hours, and the carbon carrier is taken out and vacuum-dried ; ② Heat the steam-treated carbon carrier to 400-1000°C for 1-3 hours in an inert gas tube furnace; 2. Add the above-mentioned treated carbon carrier to the mixed solution of deionized water and isopropanol disperse uniformly; 3. add the Pt and Ru compound precursors to the uniformly dispersed carbon-containing slurry, so that the Pt and Ru compound precursors are uniformly dispersed on the carbon carrier; 4. The uniformly dispersed carbon-supported Pt and Ru compounds Dry the precursor slurry under constant temperature magnetic stirring at 50-80°C; 5. Grind the obtained carbon-supported Pt and Ru compound precursor powder in an agate mortar for 10 minutes; 6. Put the carbon-supported Pt and Ru compound on T...

specific Embodiment approach 2

[0005] Specific embodiment two: take by weighing 200mg Vulcan XC-72 carbon powder produced by Cabot Company through water vapor and heat treatment, join in the mixed solution of deionized water and isopropanol, disperse evenly; Add 87.8mg (NH 4 ) 2 PtCl 6 and 25.7mg Ru(OH) 3 , make it uniformly disperse on the carbon carrier, and dry under constant temperature magnetic stirring at 60℃ to obtain the carbon-supported (NH 4 ) 2 PtCl 6 and Ru(OH) 3 For powder, grind for 10 minutes in an agate mortar. The resulting carbon was then supported on (NH 4 ) 2 PtCl 6 and Ru(OH) 3 The powder was placed in a tube furnace and reduced for 2 hours in a mixed gas of hydrogen and argon (volume ratio 1:1) at a temperature of 360°C. The prepared Pt-Ru / C catalyst has a particle size of 8-10nm and an electrochemically active specific surface area of ​​81.22m 2 / g.

specific Embodiment approach 3

[0006] Specific embodiment three: take by weighing 200mg Vulcan XC-72 carbon powder produced by Cabot Company through water vapor and heat treatment, join in the mixed solution of deionized water and isopropanol, disperse evenly; Add 87.8mg (NH 4 ) 2 PtCl 6 and 0.84ml 0.2mol / L RuCl 3 , make it evenly disperse on the carbon carrier, dry under constant temperature magnetic stirring at 80℃, and obtain the carbon-supported (NH 4 ) 2 PtCl 6 and RuCl 3 For powder, grind for 10 minutes in an agate mortar. The resulting carbon was then supported on (NH 4 ) 2 PtCl 6 and RuCl 3 The powder was placed in a tube furnace and reduced for 2 hours in a mixed gas of hydrogen and argon (volume ratio 1:1) at a temperature of 400°C. The prepared Pt-Ru / C catalyst has a particle size of 8-10nm and an electrochemically active specific surface area of ​​89.81m 2 / g.

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Abstract

The method includes following steps: adding processed carbon carrier into mixed liquor of deionized water and isopropyl alcohol and dispersing them evenly; adding predecessor of Pt and Ru compound into evenly dispersed serum containing carbon, drying the said serum through magnetic stirring under constant temperature 50-80 deg.C; grinding the obtained powder of carbon carried predecessor of Pt and Ru compound for ten minutes; deoxidizing the said carbon carried compound in mixed gas of hydrogen and nitrogen gases for 1-3 hours under 350-420 deg.C. The disclosed (NH4)2PtCl6 or (NH4)2RuCl5 is as solid, possessing lower decomposition temperature. Spongy Pt or Ru generated by deoxidizing the said solid forms skeleton structure in porous so as to raise surface area of electrochemical activity ratio and use rate of catalyst.

Description

Technical field: [0001] The invention relates to a preparation method of an anode catalyst of 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 It has attracted much attention in vehicles and portable power supplies. The research of direct methanol fuel cells is currently mainly focused on the research of anode catalysts and alcohol-resisting polymer electrolyte membranes; DMFC has low methanol electrooxidation activity and severe polarization at low temperatures, which are the main reasons for its efficiency loss and need to be further improved. Activity of methanol anode electrocatalysts. The Pt-Ru binary catalyst has a good ability to resist ...

Claims

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Application Information

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IPC IPC(8): B01J23/42B01J23/46B01J32/00B01J37/00H01M4/88H01M4/92
CPCY02E60/50
Inventor 尹鸽平王振波史鹏飞程新群杜春雨
Owner HARBIN INST OF TECH
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