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A platinum-iron intermetallic compound coated with nitrogen-doped carbon layer and its preparation and application

An intermetallic compound, nitrogen-doped carbon technology, applied in metal processing equipment, transportation and packaging, structural parts, etc., can solve problems such as poor stability, particle agglomeration, and low catalytic activity for oxygen reduction of intermetallic compounds, and achieve production costs Low, to ensure uniform dispersion, the effect of conducive to oxygen reduction performance

Active Publication Date: 2020-11-17
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention solves the technical problems that the particle agglomeration phenomenon is serious in the current preparation process of the intermetallic compound, and the oxygen reduction catalytic activity of the obtained intermetallic compound is low and the stability is poor

Method used

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  • A platinum-iron intermetallic compound coated with nitrogen-doped carbon layer and its preparation and application
  • A platinum-iron intermetallic compound coated with nitrogen-doped carbon layer and its preparation and application
  • A platinum-iron intermetallic compound coated with nitrogen-doped carbon layer and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041](1) Add 0.05mol chloroplatinic acid, 0.1mol ferrous chloride, 0.1mol dicyandiamide and 35mg conductive carbon black to 20ml of water, stir well to form a mixture, stir and mix well, sonicate for 10min, then incubate at 50°C Heating and evaporating the remaining water to obtain a viscous substance; drying and grinding the obtained product at 100°C to obtain a solid powder containing a mixture of platinum precursor, iron precursor, amino compound and carbon black;

[0042] (2) Place the powder obtained in step (1) in a tube furnace, and perform high-temperature pyrolysis under an inert gas atmosphere; heat up to 900°C at a heating rate of 5°C / min, control the flow rate of the inert gas to 20ml / min, and Insulate at 900° C. for 5 hours, and take it out after the reaction cools down to room temperature, to obtain a small-sized nitrogen-doped carbon-coated PtFe intermetallic compound.

[0043] (3) Electrochemical performance test of nitrogen-doped carbon-coated PtFe intermetal...

Embodiment 2

[0046] (1) Add 0.05mol of chloroplatinic acid, 0.01mol of ferric nitrate, 0.15mol of dicyandiamide and 35mg of conductive carbon black into 50ml of water, stir well to form a mixture, stir and mix well, sonicate for 20min, then heat at 70°C The remaining water was evaporated to dryness to obtain a viscous substance; the obtained product was dried at 120° C. and ground to obtain a solid powder containing a mixture of platinum precursor, iron precursor, amino compound and carbon black.

[0047] (2) Place the powder obtained in step (1) in a tube furnace, and perform high-temperature pyrolysis under an inert gas atmosphere; heat up to 800°C at a heating rate of 10°C / min, control the flow rate of the inert gas to 40ml / min, and Insulate at 800°C for 4 hours, and take it out after the reaction cools down to room temperature, to obtain a small-sized nitrogen-doped carbon-coated PtFe intermetallic compound.

[0048] (3) Electrochemical performance test of nitrogen-doped carbon-coated ...

Embodiment 3

[0051] (1) Add 0.05mol of chloroplatinic acid, 0.1mol of ferrous chloride, 0.2mol of dicyandiamide and 35mg of conductive carbon black into 40ml of water, stir well to form a mixture, stir and mix well, ultrasonic for 30min, then at 60°C Heat and evaporate the remaining water to obtain a viscous substance; dry the obtained product at 150°C and grind it to obtain a solid powder containing a mixture of platinum precursor, iron precursor, amino compound and carbon black.

[0052] (2) Place the powder obtained in step (1) in a tube furnace, and perform high-temperature pyrolysis under an inert gas atmosphere; heat up to 800°C at a heating rate of 2°C / min, control the flow rate of the inert gas to 10ml / min, and Insulate at 800°C for 4 hours, and take it out after the reaction cools down to room temperature, to obtain a small-sized nitrogen-doped carbon-coated PtFe intermetallic compound.

[0053] (3) Electrochemical performance test of nitrogen-doped carbon-coated PtFe intermetalli...

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Abstract

The invention relates to a PtFe intermetallic compound coated with a nitrogen-doped carbon layer and its preparation and application, belonging to the technical field of fuel cells. The preparation method is to uniformly disperse a platinum precursor, an iron precursor, an amino-containing organic substance, and a carrier in deionized water to obtain a mixed solution, and then heat to evaporate the water in the mixed solution to obtain a viscous intermediate substance; The viscous intermediate product is dried and ground to obtain a solid powder; the solid powder is calcined in a protective gas atmosphere, and the calcining is specifically: at a heating rate of 1°C / min-10°C / min Raise the temperature to 700°C-1000°C, then keep it warm for 0.5h-5h, and after cooling, the nitrogen-doped carbon-coated PtFe intermetallic compound is obtained. The nitrogen-doped carbon-coated PtFe intermetallic compound catalyst prepared by the invention has more excellent oxygen reduction activity and stability than the non-carbon-coated PtFe disordered alloy and commercial carbon-supported platinum.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a PtFe intermetallic compound coated with a nitrogen-doped carbon layer and its preparation and application. Background technique [0002] As a device that can directly convert chemical energy into electrical energy, fuel cells have the advantages of high energy conversion efficiency, good low temperature performance, high theoretical specific capacity and environmental friendliness. However, the high price of the noble metal Pt in the catalyst greatly restricts the commercial development of fuel cells, so it is very important to reduce the loading of Pt in the catalyst without affecting the activity and stability. At present, a lot of research is devoted to the regulation of the electronic structure of Pt by introducing 3d transition metals and Pt to form alloys, thereby improving the activity and stability of the catalyst, and at the same time greatly reducing th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F1/02C22C38/00H01M4/86H01M4/88H01M4/92
CPCC22C38/002H01M4/8652H01M4/8668H01M4/8673H01M4/8882H01M4/921B22F1/05B22F1/16Y02E60/50
Inventor 王得丽胡冶州
Owner HUAZHONG UNIV OF SCI & TECH
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