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Supported low-platinum core-shell catalyst and preparation and appliation thereof

A core-shell catalyst, supported technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problem of low utilization rate of platinum, and achieve the effects of high utilization rate, uniform distribution, and low load.

Inactive Publication Date: 2019-07-02
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

[0004] Aiming at the problem of low utilization rate of platinum in traditional platinum catalysts, the present invention proposes a method for preparing a catalyst with a low-platinum core-shell structure. The present invention adopts the following specific schemes:

Method used

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  • Supported low-platinum core-shell catalyst and preparation and appliation thereof
  • Supported low-platinum core-shell catalyst and preparation and appliation thereof
  • Supported low-platinum core-shell catalyst and preparation and appliation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] At 20°C, dissolve 1.470g of zinc nitrate hexahydrate and 0.74g of cobalt nitrate hexahydrate in 100ml of methanol, and dissolve 3.260 of 2-methylimidazole in 100ml of methanol. The former is slowly added to the latter under stirring, and the stirring is continued. 12min, then stand for 20h. Centrifuge, wash three times, and dry in vacuum at 150°C for 8 hours to obtain Zn 0.95 co 0.05 -ZIF8. Take 1gZn 0.95 co 0.05 -ZIF8 was placed in a corundum boat, heated to 900°C at a heating rate of 2°C / min and kept for 2 hours, then cooled to room temperature at a cooling rate of 5°C / min to take out the porous carbon support. Disperse 100mg of porous carbon carrier in 100mL of deionized water, pass through nitrogen protection, sonicate for half an hour, then add 10ml100μg mL dropwise -1 The chloroplatinic acid aqueous solution was continuously stirred for 8 hours, and the catalyst was obtained by suction filtration under reduced pressure, washed with 1 L of deionized water, and...

Embodiment 2

[0031] At 20°C, dissolve 1.470g of zinc nitrate hexahydrate and 0.147g of cobalt nitrate hexahydrate in 100ml of methanol, and dissolve 3.260g of 2-methylimidazole in 100ml of methanol. The former is slowly added to the latter under stirring, and the stirring is continued. 12min, then stand for 20h. Centrifuge, wash three times, and dry in vacuum at 150°C for 8 hours to obtain Zn 0.9 co 0.1 -ZIF8. Take 1gZn 0.95 co 0.05 -ZIF8 was placed in a corundum boat, heated to 900°C at a heating rate of 2°C / min and kept for 2 hours, then cooled to room temperature at a cooling rate of 5°C / min to take out the porous carbon support. Disperse 100mg of porous carbon carrier in 100mL of deionized water, pass through nitrogen protection, sonicate for half an hour, then add 10ml of 100μg mL dropwise -1 The chloroplatinic acid aqueous solution was continuously stirred for 8 hours, and the catalyst was obtained by suction filtration under reduced pressure, washed with 1 L of deionized water,...

Embodiment 3

[0033] At 20°C, dissolve 1.470g of zinc nitrate hexahydrate and 0.74g of ferric nitrate hexahydrate in 100ml of methanol, and dissolve 3.26g of 2-methylimidazole in 100ml of methanol. The former is slowly added to the latter under stirring, and the stirring is continued. 12min, then stand for 20h. Centrifuge, wash three times, and dry in vacuum at 150°C for 8 hours to obtain Zn 0.95 co0.05 -ZIF8. Take 1gZn 0.95 co 0.05 -ZIF8 was placed in a corundum boat, heated to 900°C at a heating rate of 2°C / min and kept for 2 hours, then cooled to room temperature at a cooling rate of 5°C / min to take out the porous carbon support. Disperse 100mg of porous carbon carrier in 100mL of deionized water, pass through nitrogen protection, sonicate for half an hour, then add 10ml of 100μg mL dropwise -1 The chloroplatinic acid aqueous solution was continuously stirred for 8 hours, and the catalyst was obtained by suction filtration under reduced pressure, washed with 1 L of deionized water, a...

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Abstract

The invention relates to a supported low-platinum core-shell catalyst and a preparation method thereof. According to the method, a low-platinum core-shell catalyst with transition metals as a core andplatinum as a shell is formed through chemical replacement by taking a porous carbon skeleton supported by metal nanoparticles obtained by pyrolysis of a metal organic skeleton doped with transitionmetals (Co, Fe, Zn) as a carrier, and the composition and size of the core-shell structure can be achieved by changing the proportions of metals in the multi-metal organic framework. Compared with theprior art, the method has the following advantages: the zinc element in the prepared organic metal skeleton can be used as a barrier to prevent the formed transition metal nanoparticles from agglomerating in the pyrolysis process, and the zinc element will evaporate with the atmosphere after the temperature exceeds 900 DEG C and will not remain in the catalyst; the supported platinum is supportedon the surface of the transition metals in the form of shell in the core-shell structure, and the platinum has low load and high utilization rate; the transition metal core in the core-shell structure can change the electronic performance of the platinum surface and thus can adjust the catalytic performance; a porous carbon carrier with high specific surface is formed through pyrolysis of the organic metal skeleton, which is conducive to the uniform distribution of active sites and the mass transfer in the reaction process.

Description

technical field [0001] The invention relates to the field of catalyst preparation and its application, in particular to the preparation and application of a supported low-platinum core-shell catalyst. Background technique [0002] Due to the advantages of cleanliness and high efficiency, fuel cells can help alleviate the pressure on global energy and the environment, and have broad application prospects in the future. In recent years, fuel cell technology has made great breakthroughs in materials, equipment and technology. However, the high cost caused by the extensive use of noble metal catalysts has hindered its commercialization process. Since only the atoms exposed on the surface can participate in the catalytic reaction, the utilization efficiency of platinum in traditional electrocatalysts is usually low. People improve the utilization efficiency of platinum by designing the catalyst structure or doping to form a series of new low-platinum catalysts, such as Platinum ...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M4/92
CPCH01M4/8825H01M4/9041H01M4/92H01M4/926Y02E60/50
Inventor 孙公权许新龙王素力
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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