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CoO/C catalyst and preparation method thereof

A technology of catalyst and solvent, which is applied in the field of oxygen reduction catalyst, can solve the problems of difficult removal of protective agent and high price of organic cobalt salt, and achieve the effects of low cost, good stability and simple preparation process

Inactive Publication Date: 2015-05-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the organic cobalt salt is expensive, and the protective agent is not easy to remove

Method used

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  • CoO/C catalyst and preparation method thereof
  • CoO/C catalyst and preparation method thereof
  • CoO/C catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] First, add 0.25g Co(OAc) 2 ·4H 2 Dissolve O in 25mL of absolute ethanol, add 1.25mL of 25w.t.% ammonia, place the mixture in the air and stir for 15min; then transfer it to an oil bath at 100℃ for heating to reflux, cooling down after 3.5h, and cooling naturally To room temperature to get CoO x colloid.

[0036] Weigh 80 mg of Vulcan XC-72 carbon black, add 25 mL of absolute ethanol, and ultrasonically disperse uniformly; add 1 mL of the obtained CoO to this slurry x The colloidal solution (metal Co mass is 5mg), magnetically stirred at room temperature for 6h. Then the mixture was passed through a rotary evaporator to remove the solvent and placed in an air oven at 80°C for 8 hours to obtain CoO x / C. The obtained black powder CoO x / C is ground, weighed and placed in a quartz boat, then transferred to a tube furnace, and placed in N 2 5℃min under the atmosphere -1 The rate of heating is programmed to 500℃, and the target product 5.88%CoO / C catalyst is obtained by treatin...

Embodiment 2

[0038] First, add 0.5g Co(OAc) 2 ·4H 2 O was dissolved in 25mL of absolute ethanol, 2.5mL of 25w.t.% ammonia was added, and the mixture was placed in the air and stirred for 15min; then it was transferred to an oil bath at 100℃ for heating and refluxing. After 3.5h, the temperature was cooled down naturally. To room temperature to get CoO x colloid.

[0039] Weigh 80 mg of Vulcan XC-72 carbon black, add 25 mL of absolute ethanol, and ultrasonically disperse uniformly; add 1 mL of the obtained CoO to this slurry x The colloidal solution (metal Co mass is 5mg), magnetically stirred at room temperature for 6h. Then the mixture was passed through a rotary evaporator to remove the solvent and placed in an air oven at 80°C for 8 hours to obtain CoO x / C. The obtained black powder CoO x / C is ground, weighed and placed in a quartz boat, then transferred to a tube furnace, and placed in N 2 5℃min under the atmosphere -1 The rate of heating is programmed to 500℃, and the target product 5....

Embodiment 3

[0041] First, add 1.25g Co(OAc) 2 ·4H 2 Dissolve O in 25mL of absolute ethanol, add 6.25mL of 25w.t.% ammonia, place the mixture in the air and stir for 15min; then transfer it to an oil bath at 100℃ for heating to reflux, cooling down after 3.5h, and cooling naturally To room temperature to get CoO x colloid.

[0042] Weigh 80 mg of Vulcan XC-72 carbon black, add 25 mL of absolute ethanol, and ultrasonically disperse uniformly; add 1 mL of the obtained CoO to this slurry x The colloidal solution (metal Co mass is 5mg), magnetically stirred at room temperature for 6h. Then the mixture was passed through a rotary evaporator to remove the solvent and placed in an air oven at 80°C for 8 hours to obtain CoO x / C. The obtained black powder CoO x / C is ground, weighed and placed in a quartz boat, then transferred to a tube furnace, and placed in N 2 5℃min under the atmosphere -1 The rate of heating is programmed to 500℃, and the target product 5.88%CoO / C catalyst is obtained by treatin...

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Abstract

The invention relates to a CoO / C catalyst, wherein loading of CoO in the catalyst is 0.01-99.99%, particle size of CoO in the catalyst is 3.5-50nm. A preparation method of the catalyst comprises the following steps: 1)preparation of nano particles: using ammoniacal liquor for hydrolyzing soluble cobalt salt, performing high temperature backflow on its mixing solution to obtain a colloidal solution or a black solid; 2)preparation of CoO / C: uniformly mixing the substance in the step 1) and powdered carbon in a solvent, removing the solvent and drying to obtain the black powder, performing temperature programming on the black powder, performing heat treatment under target temperature to obtain the CoO / C catalyst. The catalyst has the advantages of high oxygen reduction activity under alkaline condition, good stability, low cost of raw materials and preparation, simple preparation technology, and easy batch production, and is very suitable for being as an oxygen reduction catalyst of a metal / air fuel battery, an alkaline polymer dielectric membrane fuel cell under alkaline condition.

Description

Technical field [0001] The invention relates to an alkaline oxygen reduction catalyst, in particular to an oxygen reduction catalyst used in metal air fuel cells, alkaline polymer electrolyte membrane fuel cells and other alkaline conditions. [0002] The present invention also relates to the preparation method of the above-mentioned catalyst. Background technique [0003] With the depletion of petroleum resources and the need to reduce greenhouse gas emissions, the development of new clean energy technologies has become a research focus. Fuel cells and metal-air batteries, known as semi-fuel cells, are due to their high energy conversion efficiency, pollution-free, and convenient Use has become the first choice for the next generation of clean energy technology. As we all know, the oxygen reduction reaction (ORR), as the cathode reaction of fuel cells and metal-air batteries, is a slow kinetic process. Even on a clean metal platinum surface, it still has an overpotential of 300mV...

Claims

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Application Information

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IPC IPC(8): B01J23/75H01M4/90
CPCY02E60/50
Inventor 孙公权刘静姜鲁华
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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