Carbon-supported noble metal alloy catalyst as well as preparation method and application thereof

A technology of alloy catalysts and noble metals, which is applied in the synthesis of fuel cell cathode catalysts, can solve the problems of transition metals easy to migrate and fall off, reduce the catalytic effect of oxygen reduction, and insufficient binding force, so as to achieve good catalytic performance of oxygen reduction and increase porosity and specific surface area, the effect of improving catalytic activity

Inactive Publication Date: 2020-03-27
FAW JIEFANG AUTOMOTIVE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the insufficient binding force of the above method with the carbon support, the transition metal is easy to migrate and fall off on the carbon support, which reduces the catalytic effect of oxygen reduction and reduces the durability.

Method used

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  • Carbon-supported noble metal alloy catalyst as well as preparation method and application thereof
  • Carbon-supported noble metal alloy catalyst as well as preparation method and application thereof
  • Carbon-supported noble metal alloy catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] 1. Put 8g of glucose into a 100ml beaker, add deionized water to make a 60ml solution, stir for 20min, add 10ml of aqueous solution containing 1g of nickel chloride hexahydrate dropwise while stirring, then add dropwise in sodium bicarbonate solution to adjust to pH= 8.

[0081] 2. Transfer the above solution into a polytetrafluoroethylene-lined stainless steel reactor for hydrothermal carbonization reaction at 160°C for 6 hours.

[0082] 3. After the liquid is naturally cooled, centrifuge and wash the solid repeatedly with deionized water and ethanol until the filtrate is clear.

[0083] 4. Put the washed solid in a vacuum drying oven at 80° C. for 6 hours to obtain a dried carbon-loaded powder with a template.

[0084] 5. The above powder was placed in an atmosphere of 10% vol hydrogen and 90 vol% nitrogen, and the temperature was programmed to rise to 500° C. for 3 hours, and then cooled to room temperature to obtain carbon-supported nickel.

[0085] 6. Take 0.2g car...

Embodiment 2

[0090] 1. Put 5g of fructose into a 100ml beaker, add deionized water to make a 60ml solution, stir for 10min, add 10ml of an aqueous solution containing 0.9g of cobalt nitrate hexahydrate dropwise while stirring, then add ammonia solution dropwise to adjust to pH=9.

[0091] 2. Transfer the above solution into a polytetrafluoroethylene-lined stainless steel reactor for hydrothermal carbonization reaction at 180°C for 5 hours.

[0092] 3. After the liquid is naturally cooled, centrifuge and wash the solid repeatedly with deionized water and ethanol until the filtrate is clear.

[0093] 4. Dry the washed solid in a vacuum oven at 90°C for 6 hours to obtain a carbon-loaded powder with a template.

[0094] 5. The above powder was placed in an atmosphere of 20vol% hydrogen and 80vol% argon, and the temperature was programmed to rise to 500° C. for 3 hours, and then cooled to room temperature to obtain carbon-supported cobalt.

[0095] 6. Take 0.14g of carbon-supported cobalt and ...

Embodiment 3

[0100] 1. Put 4g of starch into a 100ml beaker, add deionized water to make a 50ml solution, stir for 20min, add 10ml of an aqueous solution containing 0.5g of ferric chloride dropwise while stirring, then add acetic acid dropwise to adjust to pH=5.

[0101] 2. Transfer the above solution into a polytetrafluoroethylene-lined stainless steel reactor for hydrothermal carbonization reaction at 170° C. for 12 hours.

[0102] 3. After the liquid is naturally cooled, centrifuge and wash the solid repeatedly with deionized water and ethanol until the filtrate is clear.

[0103] 4. Dry the washed solid in a vacuum oven at 80°C for 8 hours to obtain a carbon-loaded powder with a template.

[0104] 5. Place the catalyst precursor above in an atmosphere of 5 vol% hydrogen and 95 vol% helium, and program the temperature to 700° C. for 1 hour, and then cool to room temperature to obtain carbon-supported iron.

[0105] 6. Prepare 70ml solution of 0.22g carbon-supported iron with deionized ...

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Abstract

The invention provides a carbon-supported noble metal alloy catalyst as well as a preparation method and application thereof, and the method comprises the following steps: 1) preparing an aqueous solution of sugar and template salt, adjusting the pH value, and carrying out hydrothermal carbonization reaction; 2) drying the hydrothermal carbonization product; 3) carrying out primary heat treatmentin a mixed gas atmosphere of inert gas and hydrogen to obtain carbon-loaded transition metal; 4) dispersing the obtained carbon-loaded transition metal in water to form a carbon-loaded transition metal aqueous solution, adding a noble metal precursor solution and a reducing agent, reacting and drying; and 5) carrying out secondary heat treatment on the obtained dried product in an inert gas atmosphere to obtain the carbon-supported noble metal alloy catalyst. The obtained catalyst has high catalytic activity and good durability, the initial potential and half-wave potential of an LSV curve ofthe catalyst are superior to those of a commercial platinum-carbon catalyst, the durability of the catalyst is superior to that of the commercial catalyst after 3000 times of circulation, and the catalyst has good oxygen reduction catalytic performance.

Description

technical field [0001] The invention belongs to the technical field of synthesis of fuel cell cathode catalysts, a carbon-supported noble metal alloy catalyst, a preparation method and application thereof. Background technique [0002] Facing a series of serious problems such as shortage of fossil energy and global environmental pollution, it is urgent to develop clean energy technology. Among them, the fuel cell is an energy conversion device that directly converts the chemical energy of the fuel into electrical energy through a chemical reaction, and has attracted worldwide attention for its greenness and high efficiency. However, the high cost of fuel cells limits its commercialization process, and the cost of catalysts is too high due to the scarcity and high price of noble metal resources of platinum catalysts. In order to reduce the amount of platinum used and improve the redox activity of the catalyst, the platinum alloy catalyst formed by transition metal and platin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/92
CPCH01M4/8882H01M4/921H01M4/926Y02E60/50
Inventor 唐柳于力娜朱云朱雅男杨帅
Owner FAW JIEFANG AUTOMOTIVE CO
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