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

A methanol fuel cell, binary compound technology, applied in physical/chemical process catalysts, battery electrodes, metal/metal oxide/metal hydroxide catalysts, etc., can solve unfavorable mass production, difficulty in controlling the dispersion of metal particles, Problems such as fast reaction speed of impregnation method

Inactive Publication Date: 2006-02-22
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 6.2 mmol SnCl 2 2H 2 O placed in 70 ml of 1.25 mol / L NaOH solution at 20°C for 10 minutes of ultrasonic vibration, after it is completely dissolved, add 20.61 grams of carbon black XC-7, and then ultrasonic vibration for 20 minutes to disperse the carbon black, and then at high speed While stirring, add 25 mL of RuCl all at once 3 and H 2 PtCl 6 A mixed solution containing RuCl 3 and H 2 PtCl 6 Both were 0.51 mmol, and stirred at high speed for 8 hours at 20°C. Pour off the liquid after standing to separate, then filter. Then first wash the filter residue with 1.25 mol / L NaOH, 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 1 mol / L H 2 SO 4 +1 mol / L CH 3 The steady-state polarization curve of OH, such...

Embodiment 2

[0022] Take 6.2 mmol SnCl 2 2H 2 O placed in 70 ml of 1.25 mol / L NaOH solution at 20°C for 10 minutes of ultrasonic vibration, after it is completely dissolved, add 20.61 grams of carbon black XC-7, and then ultrasonic vibration for 20 minutes to disperse the carbon black, and then in 50 °C, while stirring at high speed, add 60 ml of RuCl dropwise 3 and H 2 PtCl 6 A mixed solution containing RuCl 3 and H 2 PtCl 6 Both are 0.51 mmol, 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 first wash the filter residue with 1.25 mol / L NaOH solution, 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 abov...

Embodiment 3

[0026] Take 12.3 mmol SnCl 2 2H 2 O placed in 106 ml of 1.25 mol / L NaOH solution at 20°C for 10 minutes of ultrasonic vibration, after it is completely dissolved, add 1.21 g of carbon black XC-7, and then ultrasonic vibration for 20 minutes to disperse the carbon black and dilute to 280 ml, heated to 80°C, then added dropwise 100 ml of RuCl while stirring at high speed 3 and H 2 PtCl 6 A mixed solution containing RuCl 3 and H 2 PtCl6 Both are 1.025 mmoles, and the dropwise addition time is 2 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 first wash the filter residue with 1.25 mol / L NaOH, 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 was directly used for performance testing, and this part of the product was marked as C, and ...

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