Electrocatalyst with hollow nanometer platinum ruthenium alloy particle supported on carbon surface and its preparing method

A platinum-ruthenium alloy and nanoparticle technology, which is applied in the field of electrocatalysts and their preparation, can solve the problems of no platinum-ruthenium alloy nanoparticle electrocatalysts, and achieve excellent electrocatalytic performance, improved utilization, and wide application

Inactive Publication Date: 2006-09-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there have been no reports of carbon-supported hollow platinum-ruthenium alloy nanoparticle electrocatalysts so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 68 milliliters of 0.002mol / L cobalt chloride solution, join in the three-neck flask of 250 milliliters, then add sodium citrate, the concentration of sodium citrate in the synthesis solution is 0.002mol / L. Stir continuously with a magnetic stirrer, and pass nitrogen gas into the synthesis solution for 15 minutes, then add 14 mL of sodium borohydride solution with a concentration of 0.01 mol / L dropwise, and react for 30 minutes under the protection of nitrogen gas; Add the mixed solution of 20 milliliters of potassium chloroplatinate and ruthenium chloride, the concentration of potassium chloroplatinate in the mixed solution is 0.002mol / L, the concentration of ruthenium chloride is 0.0005mol / L, continue magnetic stirring reaction 30 minutes; Add 90 mg of XC-72 nanocarbon, continue to pass nitrogen and stir for 1 hour, then filter the mixture in the flask, wash it with deionized water, and dry it at 90°C to obtain a hollow platinum ruthenium / XC-72 electrocatalyst. The mas...

Embodiment 2

[0019] 75 milliliters of 0.006mol / L cobalt chloride solution, join in the three-necked flask of 250 milliliters, then add sodium citrate, the concentration of sodium citrate in the synthesis solution is 0.006mol / L. Stir continuously with a magnetic stirrer, and pass nitrogen gas into the synthesis solution. After 20 minutes, add 50 mL of sodium borohydride solution dropwise with a concentration of 0.01 mol / L, and react for 50 minutes under the protection of nitrogen gas; then drop into the synthesis solution Add the mixed solution of 10 milliliters of chloroplatinic acid and ruthenium chloride, the concentration of chloroplatinic acid in the mixed solution is 0.01mol / L, the concentration of ruthenium chloride is 0.01mol / L, magnetic stirring reaction 60 minutes; Finally add 70 mg XC-72 nano-carbon, continue to pass nitrogen and stir for 2 hours, then filter the mixture in the flask, wash it with deionized water, and dry it at 90°C to obtain a hollow platinum ruthenium / XC-72 elec...

Embodiment 3

[0024] 90 milliliters of 0.005mol / L cobalt sulfate solution, join in the three-neck flask of 250 milliliters, then add sodium citrate, the concentration of sodium citrate in the synthesis solution is 0.005mol / L. Stir continuously with a magnetic stirrer, and feed nitrogen into the synthesis solution. After 15 minutes, add 25 mL of sodium borohydride solution dropwise with a concentration of 0.02 mol / L, and react for 40 minutes under the protection of nitrogen gas; Add dropwise the mixed solution of 20 milliliters of chloroplatinic acid and ruthenium chloride, the concentration of chloroplatinic acid in the mixed solution is 0.005mol / L, the concentration of ruthenium chloride is 0.005mol / L, magnetic stirring reaction 45 minutes; Finally add 70 Milligrams of carbon nanotubes, continue to pass nitrogen and stir for 1 hour, then filter the mixture in the flask, wash it with acetone and deionized water, and dry it at 90°C to obtain a hollow platinum ruthenium / CNTs electrocatalyst. ...

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Abstract

The invention discloses a carbon surface carrier hollow platinum ruthenium alloy nanometer particle electric catalyst. Wherein, the platinum ruthenium nanometer particle is in hollow structure; the atom rate of alloy is PtxRuy, while X=0.2-0.8, Y=0.8-0.2 and X+Y=1; the quantity percentage of platinum ruthenium alloy nanometer particle in the catalyst is 9-30%, and the other is carbon. The preparing steps comprises: (1) solving the cobalt salt in the deionized water, adding stabilizer, and feeding nitrogen gas to remove the oxygen in the solution; (2) under the protection of nitrogen gas, adding sodium borohydride solution to deoxidize the cobalt ion into metallic nanometer particle and adding the solution of platinum salt and ruthenium salt to react; (3) adding carbon carrier to be mixed for 1-2 hours, to be filtered, washed and dried to attain the hollow platinum ruthenium / carbon electric catalyst. The inventive catalyst can improve the utilization of platinum and ruthenium, with better electric catalysis property on the electric oxidization of methanol. Therefore, it can be widely used in fuel battery.

Description

technical field [0001] The invention relates to an electrocatalyst in a fuel cell and a preparation method thereof, in particular to a carbon-loaded hollow platinum-ruthenium alloy nanoparticle electrocatalyst and a preparation method thereof. Background technique [0002] Carbon material supported platinum-ruthenium alloy nanoparticles have very important applications in fuel cells. Platinum-ruthenium alloy catalysts have excellent resistance to carbon monoxide poisoning than single metal platinum, so they are used as direct methanol fuel cells and fuel cells using hydrogen containing trace amounts of carbon monoxide. important electrocatalytic electrode materials. XC-72 nanocarbon and carbon nanotubes have high specific surface area and are widely used as catalyst supports. XC-72 nanocarbon and carbon nanotube-supported platinum-ruthenium alloys have good electrocatalytic properties for methanol. However, the high price of platinum and ruthenium limits its practical appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/40B01J35/04B01J37/00B01J37/02B01J37/16
Inventor 陈卫祥赵杰李翔黄思玉
Owner ZHEJIANG UNIV
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