Method for synthesizing a small-size high-dispersion intermetallic compound catalyst material and application

A technology of intermetallic compounds and catalysts, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of non-universal synthesis methods, single system, complex process, etc., and achieve the effect of improving catalytic durability and inhibiting easy agglomeration

Active Publication Date: 2020-01-03
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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  • Method for synthesizing a small-size high-dispersion intermetallic compound catalyst material and application
  • Method for synthesizing a small-size high-dispersion intermetallic compound catalyst material and application
  • Method for synthesizing a small-size high-dispersion intermetallic compound catalyst material and application

Examples

Experimental program
Comparison scheme
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 hours, wash with water until the pH is neutral, dry in vacuum at 80°C, and grind. 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-8 DC.

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 hours, wash with water until the pH is neutral, dry in vacuum at 80°C, and grind. 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-8 DC.

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Abstract

The invention discloses a method for synthesizing a small-size high-dispersion intermetallic compound catalyst material and an application. According to the method, an MOF-derived carbon material is soaked in a solution containing a noble metal precursor and a non-noble metal precursor, and then, the carbon material is freeze-dried and treated at high temperature in an environment containing a reducing atmosphere. The obtained PtxM intermetallic compound catalyst is small in nanoparticle granularity, and the particles are uniformly distributed on the surface of MOF derived carbon and in mesopores. Compared with an intermetallic compound prepared by a common method, the intermetallic compound prepared by the method for controlling the particle size through the confinement effect of MOF-derived carbon has the important advantages that the size is small, the particles are uniformly dispersed, and many nano particles can be dispersed into the pores of MOF-derived carbon. The prepared ordered PtxM/MOFDC catalyst is used for an oxygen reduction reaction of a fuel cell and shows 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 Applications(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
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