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Method of preparing platinum ruthenium/carbon two-element compounded catalyst of positive electrode of alcohol fuel cell

A fuel cell and binary composite technology, which is applied in the direction of physical/chemical process catalysts, battery electrodes, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem that the dispersion of metal particles is difficult to control, and the impregnation method has a fast reaction speed , long preparation time, etc.

Inactive Publication Date: 2005-01-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The catalyst particles prepared by the colloid method are small, but the concentration requirements are strict during preparation, which is not conducive to mass production; the impregnation method has a fast reaction speed, which is not conducive to controlling the size of the catalyst particles, and the dispersion of metal particles on the carrier is not easy to control
Carbonyl complex method, the preparation time is too long, and it is not conducive to mass production

Method used

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  • Method of preparing platinum ruthenium/carbon two-element compounded catalyst of positive electrode of alcohol fuel cell
  • Method of preparing platinum ruthenium/carbon two-element compounded catalyst of positive electrode of alcohol fuel cell
  • Method of preparing platinum ruthenium/carbon two-element compounded catalyst of positive electrode of alcohol fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take 6.2mmol SnCl 2 2H 2 O placed in 70ml 1.25M NaOH solution at 20°C for 10 minutes of ultrasonic vibration, after it is completely dissolved, then add 0.61g of carbon black XC-72, and then ultrasonic vibration for 20 minutes to make the carbon black highly dispersed, and then stir at high speed While adding 25ml RuCl at one time 3 and H 2 PtCl 6 A mixed solution containing RuCl 3 and H 2 PtCl 6 Both are 0.51mol, and stirred at 20°C for 8 hours at high speed. Pour off the liquid after standing to separate, then filter. Then wash the filter residue with 1.25M NaOH first, and then wash it repeatedly with hot deionized water. After filtering and washing, the filter residue was dried in an oven at 80° C. for 24 hours.

[0019] The product of this embodiment is marked as A, and thermogravimetric analysis shows that the yield of Pt and Ru is above 98%.

[0020] Product A at 1MH 2 SO 4 +1 MCH 3 The steady-state polarization curve of OH, such as figure 1 , showin...

Embodiment 2

[0022] Take 6.2mmol SnCl 2 2H 2 O placed in 70ml of 1.25M NaOH solution at 20°C for 10 minutes of ultrasonic vibration, after it was completely dissolved, then added 0.61g of carbon black XC-72, and then ultrasonically oscillated for 20 minutes to make the carbon black highly dispersed, and then at 50°C 60ml RuCl was added dropwise while stirring at high speed 3 and H 2 PtCl 6 A mixed solution containing RuCl 3 and H 2 PtCl 6 Both are 0.51mol, and the dropwise addition time is 4 hours, and after the dropwise addition is completed, the insulation and stirring are continued for 1 hour. Pour off the liquid after standing to separate, then filter. Then wash the filter residue with 1.25M NaOH first, and then wash it repeatedly with hot deionized water. After filtering and washing, the filter residue was dried in an oven at 80° C. for 24 hours.

[0023] The product of this embodiment is marked as B, and thermogravimetric analysis shows that the yield of Pt and Ru is above 9...

Embodiment 3

[0026] Take 12.3mmol SnCl 2 2H 2 O placed in 106ml of 1.25M NaOH solution at 20°C for 10 minutes of ultrasonic vibration, after it is completely dissolved, add 1.21g of carbon black XC-72, and then ultrasonic vibration for 20 minutes to make the carbon black highly dispersed, and dilute to 280ml , the temperature was raised to 80°C, and then 100ml RuCl was added dropwise while stirring at high speed 3 and H 2 PtCl 6A mixed solution containing RuCl 3 and H 2 PtCl 6 Both are 1.025mol, and the dropwise addition time is 2 hours, and after the dropwise addition is completed, continue to keep stirring for 1 hour. Pour off the liquid after standing to separate, then filter. Then wash the filter residue with 1.25M NaOH first, and then wash it repeatedly with hot deionized water. After filtering and washing, the filter residue was dried in an oven at 80° C. for 24 hours. After drying, a part is directly used for performance testing, and this part of the product is marked as C,...

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Abstract

The method includes steps: treating carrier of carbon black by using high alkaline solution containing weak reducing agent stannous to make active sites on surface of carbon black distribute evenly; adding chloro-platinic acid solution containing high chemical valence ruthenium to deoxidize and deposit ruthenium ions and ions of chloroplatinic acid radical on active sites on surface of carbon black; optimizing figure platinum of ruthenium so as to generate PtRu / C duality catalytic composite. Features are as following: favorable catalytic activity at lower platinum loading, and high capability of against CO poisoning. The product prepared by the invention can be applied to anodic catalytic in methanol fuel cells directly, as well as applicable to other fuel cell and cracking organic etc.

Description

technical field [0001] The invention relates to a liquid-phase preparation method of a fuel cell catalyst, and relates to the preparation of a direct methanol fuel cell anode carbon-supported catalyst. Background technique [0002] Among the known preparation methods of fuel cell catalysts, typical ones include colloid method, impregnation method, carbonyl complex method and the like. Colloid method, as reported by M.Watanabe, et.al., Preparation of highly dispersed Pt+Ralloy clusters and the activity for electrocoxidation of methanol, J.Electroanal.Chem., 229 (1987) 395, is in a weakly acidic environment To carry out, first convert chloroplatinic acid into a complex acid, then use an oxidant to oxidize the complex acid into platinum dioxide, and convert ruthenium trichloride into ruthenium dioxide, and the two form colloids and deposit on the carrier together. Carry out reduction treatment with hydrogen before use, this method is improved from the preparation of one-way ca...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J23/42B01J23/46H01M4/88H01M4/90H01M4/92
CPCY02E60/50
Inventor 王新东张红飞陈玲王博
Owner UNIV OF SCI & TECH BEIJING
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