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A method and application of synthesizing small-sized highly dispersed intermetallic compound catalyst material

A technology of intermetallic compounds and catalysts, which is applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of non-universal synthesis methods, single system, complex process, etc.

Active Publication Date: 2021-09-14
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although there have been many research reports on controlling the particle size of intermetallic compounds, most of them focus on a single system, the synthesis method is not universal, and the process is complicated

Method used

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  • A method and application of synthesizing small-sized highly dispersed intermetallic compound catalyst material
  • A method and application of synthesizing small-sized highly dispersed intermetallic compound catalyst material
  • A method and application of synthesizing small-sized highly dispersed intermetallic compound catalyst material

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Experimental program
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Effect test

Embodiment 1

[0030] ZIF-8 was pyrolyzed at 950°C for 3 h in an Ar environment, and the resulting ZIF-8-derived carbon was treated with 0.5 M H 2 SO 4 After pickling at 80°C for 10 h, washing with water until the pH was neutral, drying in vacuum at 80°C, and grinding. Dissolve chloroplatinic acid and cobalt chloride in deionized water, and ultrasonically mix to form a uniform metal precursor solution. The concentrations of chloroplatinic acid and cobalt chloride are 0.256 mol / L and 0.086 mol / L, respectively. Take 100 ul metal precursor solution and drop evenly into 20 mg treated ZIF-8 derived carbon, sonicate for 1 h, and then freeze-dry. Dry the product in 8% H 2 / Ar atmosphere at 750 ℃ ​​for 2h. Get fuel cell catalyst Pt 3 Co / ZIF-8DC.

Embodiment 2

[0032] UIO-66 was pyrolyzed at 950 °C for 3 h in an Ar environment, and the obtained UIO-66 derived carbon was treated with an aqueous solution of HF (HF and H 2 O volume ratio is 1:1), after acid washing at 60 °C for 10 h, washing with water until the pH is neutral, vacuum drying at 80 °C, and grinding. Dissolve chloroplatinic acid and cobalt chloride in deionized water, and ultrasonically mix to form a uniform metal precursor solution. The concentrations of chloroplatinic acid and cobalt chloride are 0.256 mol / L and 0.086 mol / L, respectively. Take 100ul of the metal precursor solution and drop evenly into 20 mg of treated UIO-66 derived carbon, sonicate for 1 h, and then freeze-dry. Dry the product in 8% H 2 / Ar atmosphere at 750 ℃ ​​for 2h. Get fuel cell catalyst Pt 3 Co / UIO-66DC.

Embodiment 3

[0034] ZIF-8 was pyrolyzed at 950°C for 3 h in an Ar environment, and the resulting ZIF-8-derived carbon was treated with 0.5 M H 2 SO 4 After pickling at 80°C for 10 h, washing with water until the pH was neutral, drying in vacuum at 80°C, and grinding. Dissolve chloroplatinic acid and ferric chloride in deionized water, and ultrasonically mix to form a uniform metal precursor solution. The concentrations of chloroplatinic acid and ferric chloride are 0.256 mol / L and 0.086 mol / L, respectively. Take 100 ul metal precursor solution and drop evenly into 20 mg treated ZIF-8 derived carbon, sonicate for 1 h, and then freeze-dry. Dry the product in 8% H 2 / Ar atmosphere at 750 ℃ ​​for 2h. Get fuel cell catalyst Pt 3 Fe / ZIF-8DC.

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Abstract

The invention discloses a method and application for synthesizing a small-sized highly dispersed intermetallic compound catalyst material. The method involves impregnating MOF-derived carbon materials with solutions containing noble metal precursors and non-noble metal precursors, freeze-drying, and high-temperature treatment in an environment containing a reducing atmosphere. get Pt x M intermetallic compound catalyst nanoparticles have a small particle size, and the particle distribution is uniform and evenly distributed on the surface of the MOF-derived carbon and inside the mesopores. Compared with the intermetallic compound prepared by the usual method, the intermetallic compound prepared by the method of using the MOF-derived carbon confinement to control the particle size proposed by the present invention has small size, uniform dispersion, and many nanoparticles can be dispersed into the MOF-derived carbon. An important advantage in the channel. Prepared ordered Pt x M / MOFDC catalysts are used in the oxygen reduction reaction of fuel cells and exhibit good catalytic performance.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a synthesis method and application of a small particle size and highly dispersed intermetallic compound. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has the advantages of high energy conversion efficiency and no pollution, and is one of the most important new energy technologies in the 21st century. However, due to cost and durability issues, the commercialization of fuel cells still faces great challenges. One of the main factors affecting the performance and cost of a fuel cell is the catalyst at the cathode. Pt x Due to the electronic effect and geometric effect of the transition metal M on Pt, the M alloy catalyst can simultaneously improve the catalytic stability and mass specific activity, and effectively reduce the cost of the catalyst. However, this kind of common alloy (solid solution) has the problem that the transition met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/88
CPCH01M4/8825H01M4/9058H01M4/9083Y02E60/50
Inventor 廖世军赵伟悦崔志明
Owner SOUTH CHINA UNIV OF TECH