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PtAu nano catalyst with controllable active site spacing and preparation method thereof

A nano-catalyst and active site technology, applied in the direction of electrochemical generators, fuel cells, structural parts, etc., can solve the problem that the catalyst cannot meet the requirements of anode catalysis, and achieve the goal of improving electrocatalytic performance, high stability and excellent performance Effect

Active Publication Date: 2019-08-23
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these catalysts cannot meet the practical requirements for anode catalysis, and almost no catalyst can maintain 1.0A mg after j-t stability test for 3600s Pt -1 Above the current density, the anode stability problem is still a huge challenge for the development of fuel cells

Method used

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  • PtAu nano catalyst with controllable active site spacing and preparation method thereof
  • PtAu nano catalyst with controllable active site spacing and preparation method thereof
  • PtAu nano catalyst with controllable active site spacing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] a. Add 19.7mg platinum acetylacetonate, 20.6mg chloroauric acid, 200mg three

[0020] N-octyl phosphine oxide, 4mL oleylamine and 6mL octadecene, blow nitrogen, and stir the solution until it becomes transparent.

[0021] b. Rapidly raise the temperature of the solution to 260°C, keep the temperature constant for 60 minutes, and then cool it naturally to 80°C.

[0022] c. Mix the reaction solution with cyclohexane and ethanol and centrifuge to wash, and the resulting precipitate has a controllable active site spacing

[0023] PtAu nanocatalysts, denoted as Pt 46 Au 54 alloy.

Embodiment 2

[0025] a. Add 9.8 mg of platinum acetylacetonate, 30.9 mg of chloroauric acid, 200 mg of tri-n-octyl phosphine oxide, 4 mL of oleylamine and 6 mL of octadecene into a 50 mL three-neck flask, blow nitrogen gas, and stir the solution until it becomes transparent.

[0026] b. Rapidly raise the temperature of the solution to 260°C, keep the temperature constant for 60 minutes, and then cool it naturally to 80°C.

[0027] c. The reaction liquid is mixed with cyclohexane and ethanol and centrifuged to wash, and the resulting precipitate is a PtAu nanocatalyst with a controllable active site spacing, denoted as Pt 24 Au 76 Alloy, surface Pt / Au atomic ratio 1:1.

Embodiment 3

[0029] a. Add 6.7mg of platinum acetylacetonate, 32.7mg of chloroauric acid, 500mg of tri-n-octylphosphine oxide, 4mL of oleylamine and 6mL of octadecene into a 50mL three-necked flask, blow nitrogen gas, and stir the solution to a transparent state.

[0030] b. Rapidly raise the temperature of the solution to 260°C, keep the temperature constant for 60 minutes, and then cool it naturally to 80°C.

[0031] c. The reaction liquid is mixed with cyclohexane and ethanol and centrifuged to wash, and the resulting precipitate is a PtAu nanocatalyst with a controllable active site spacing, denoted as Pt 14 Au 86 alloy.

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Abstract

The invention discloses a PtAu nano catalyst with a controllable active site spacing and a preparation method thereof. The method comprise steps that platinum acetylacetonate, chloroauric acid, tri-n-octylphosphine oxide, oleylamine and octadecene are mixed under the nitrogen atmosphere and are stirred to a clear state; the solution is then heated and subjected to temperature insulation, reactionis completed, after natural cooling and centrifugal washing, the PtAu nano catalyst having the controllable active site spacing is obtained. The method is advantaged in that in the preparation process, the equilibrium potential of the two types of precursor salt is evened by the tri-n-octylphosphine oxide, two elements are co-reduced, atomic distribution of a surface of the nano crystal is effectively changed by adjusting an input ratio of acetylacetonate platinum and chloroauric acid and utilizing surface atomic reconstruction induced by high temperature, the Pt-Au active site spacing is shortened, the Pt-Au distance is regulated to greatly improve activity and stability of the PtAu nano catalyst in methanol oxidation reaction, and the catalyst can further be used in oxygen reduction reaction.

Description

technical field [0001] The invention belongs to the technical field of inorganic nano-catalyst synthesis, in particular to a PtAu nano-catalyst with controllable active site spacing and a preparation method thereof. The catalyst has extremely high activity and ultra-high stability in methanol oxidation reaction, and also It can be used in oxygen reduction reaction. Background technique [0002] Alkaline direct methanol fuel cells, as one of the most promising new energy sources to replace traditional energy sources, have received widespread attention in recent years. Pt-based nanocatalysts have been proven to be the most efficient electrocatalysts for its anodic methanol oxidation reaction, but the Pt sites are easily deactivated by poisoning by CO-like intermediates generated in the catalytic reaction, therefore, the only way to accelerate the oxidation of CO is kinetically. Only by removing and releasing more active sites can the activity and stability of the catalyst be ...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/92H01M8/1011
CPCH01M4/8882H01M4/921H01M8/1011Y02E60/50
Inventor 许苏英侯文杰汪乐余
Owner BEIJING UNIV OF CHEM TECH
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