Prussian blue-based high-stability high-activity Pt-based catalyst for fuel cell and preparation method thereof

A Prussian blue, fuel cell technology, applied in chemical instruments and methods, physical/chemical process catalysts, battery electrodes, etc., can solve the problems of cathode catalyst activity and stability, and achieve the goal of improving electrocatalytic activity and increasing stability. Effect

Active Publication Date: 2015-04-01
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of the activity and stability of fuel cell cathode catalysts, the invention provides a Pt-based catalyst with high stability and high activity for fuel cells based on Prussian blue and its preparation method

Method used

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  • Prussian blue-based high-stability high-activity Pt-based catalyst for fuel cell and preparation method thereof
  • Prussian blue-based high-stability high-activity Pt-based catalyst for fuel cell and preparation method thereof
  • Prussian blue-based high-stability high-activity Pt-based catalyst for fuel cell and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Get 2.8mL chloroplatinic acid solution (Pt content: 3.8mgPt mL -1 ) was dissolved in 100 mL of water, 150 μL of polydiallyl dimethyl ammonium chloride was added as a stabilizer, and stirred for 30 min. Add strong reducing agent NaBH 4 Solution (20mg NaBH 4 dissolved in 10 mL of water), and continued stirring at room temperature for 2 h to completely reduce the Pt precursor to obtain the Pt nanoparticle colloid.

[0039] The Pt nanoparticles are uniform in size, and the particle size distribution is about 2.3nm, such as Figure 12 shown.

Embodiment 2

[0041] Take 4.6mL ferric chloride solution (5mmol L -1 ) was diluted with 100 mL of water. To which was added 1.5mL H 2 o 2 (30wt%) after ultrasonication for 20s, immediately add 3.4mL potassium ferrocyanide solution (5mmol L -1 ), sonicated for 2 hours to obtain PB colloid. according to figure 2 In the preparation process shown, the Pt colloid solution in Example 1 was mixed with the PB colloid for 24 hours to obtain the Pt-PB composite colloid solution, and 35 mg of Vulcan XC-72R was added thereto, fully ultrasonicated for 2 hours, and stirred for 24 hours. In order to deposit the Pt-PB composite colloidal particles on the surface of the carrier, it is necessary to add KNO 3 , the precipitant concentration is 0.5mol L -1 . Stirring is continued for 24 hours to deposit the Pt-PB composite colloidal particles on the surface of the carrier, the catalyst is suction filtered or centrifuged, washed and dried, and the Pt-based composite catalyst based on Prussian blue can b...

Embodiment 3

[0043] Take 2.3mL ferric chloride solution (5mmol L -1 ) was diluted with 100 mL of water. To which was added 1.5mL H 2 o 2 (30wt%) after ultrasonication for 20s, immediately add 1.7mL potassium ferrocyanide solution (5mmol L -1 ), sonicated for 2 hours to obtain PB colloid. according to figure 2 In the preparation process shown, the Pt colloid solution in Example 1 was mixed with the PB colloid for 24 hours to obtain the Pt-PB composite colloid solution, and 37.5 mg of Vulcan XC-72R was added thereto, fully ultrasonicated for 2 hours, and stirred for 24 hours. In order to deposit the Pt-PB composite colloidal particles on the surface of the carrier, it is necessary to add KNO 3 , the precipitant concentration is 0.5mol L -1 . Stirring is continued for 24 hours to deposit the Pt-PB composite colloidal particles on the surface of the carrier, the catalyst is suction filtered or centrifuged, washed and dried, and the Pt-based composite catalyst based on Prussian blue can...

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Abstract

The invention relates to a prussian blue-based high-stability high-activity Pt-based catalyst for a fuel cell and a preparation method thereof, and relates to the Pt-based catalyst for the fuel cell and the preparation method thereof, aiming at achieving the purposes of stability and activity of a cathode catalyst of the fuel cell. The catalyst is a composite catalyst which comprises Pt, the prussian blue and a carrier, wherein the weight ratio of the Pt to the prussian blue is (1-20) to 1, and the weight ratio of the Pt to total amount of the composite catalyst is (2.5-60) to 100. Compared with commercial Pt / C, the Pt-based composite catalyst disclosed by the invention has the advantages that the stability and the activity are greatly promoted, and a related Pt-prussian blue synergetic mechanism is provided for the first time to explain the promotion of the stability and the activity.

Description

technical field [0001] The invention relates to a Pt-based catalyst for a fuel cell and a preparation method thereof, in particular to a Pt-based catalyst with high stability and high activity for a fuel cell based on Prussian blue and a preparation method thereof. Background technique [0002] Fuel cells have the advantages of high energy density, high conversion efficiency, low operating temperature, no pollution, and quick start and stop, so they are considered to be effective energy conversion devices that can effectively curb environmental degradation and solve energy crises. widespread attention. However, due to the use of noble metals such as Pt, the cost of fuel cells is too high, in which the Pt catalyst accounts for more than 40% of the total cost, which seriously hinders the commercialization of fuel cells. Therefore, improving the activity and service life of fuel cell catalysts is a necessary condition for the commercialization of fuel cells. [0003] At prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92B01J27/26
CPCH01M4/921Y02E60/50
Inventor 尹鸽平杜磊杜春雨孔凡鹏钱正义张生陈广宇孙雍荣高云智
Owner HARBIN INST OF TECH
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