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Preparation method of sub-nano platinum-based ordered alloy

A technology of ordered alloys and platinum-based alloys, applied in the field of chemical materials, can solve the problems of large catalyst particle size and insufficient dispersion, and achieve the effect of simple and easy preparation method, improved catalytic activity, and small particle size

Active Publication Date: 2020-06-05
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for preparing a sub-nanometer platinum-based ordered alloy, in order to solve the problem that the particle size of the catalyst obtained by the existing preparation method is relatively large, and the dispersion is not uniform enough at the same time

Method used

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  • Preparation method of sub-nano platinum-based ordered alloy
  • Preparation method of sub-nano platinum-based ordered alloy
  • Preparation method of sub-nano platinum-based ordered alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0052] A method for preparing a subnano platinum-based ordered alloy, comprising the following steps:

[0053] Step 1: ultrasonically disperse 100mg of multi-walled carbon nanotubes (MWCNT) in 100ml of 1mol / L hydrochloric acid solution, then add 100mg of aniline, and then ultrasonically disperse to obtain a uniformly dispersed mixed solution, place the mixed solution in a low-temperature In the constant temperature reaction bath, add 1ml of 0.04mmol / L FeCl dropwise3 After the solution was continuously stirred for 10 hours, after adding the initiator APS and continuing to stir for 20 hours, it was evaporated to complete dryness at 50°C using a rotary evaporator, and then calcined under an argon atmosphere to obtain FeNC single atoms. The calcining temperature was 900°C. Calcination time is 2h.

[0054] Step 2: ultrasonically disperse the FeNC single atom prepared in step 1 into 100ml of 1mol / L hydrochloric acid solution, and add 1ml of chloroplatinic acid solution dropwise, sti...

Embodiment 2～15

[0057] The preparation methods of Examples 2-15 are the same as those of Example 1, except that, as shown in Table 1, the components and process parameters of non-noble metal precursor solutions and platinum precursors used are different.

[0058] Table 1 is a list of components and process parameters of Examples 2 to 8 ("--" in the table represents unused)

[0059]

[0060]

[0061] Table 2 is a list of components and process parameters of Examples 9 to 15 ("--" in the table represents unused)

[0062]

[0063]

[0064] Enumerate 5 groups of comparative examples and embodiment 1~10 in addition and carry out comparative experiment:

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Abstract

The invention relates to the technical field of chemical materials. The invention discloses a preparation method of a platinum-based ordered alloy, and particularly discloses a preparation method of asub-nano platinum-based ordered alloy. The preparation method comprises the following steps: ultrasonically dispersing multiwalled carbon nanotubes and a nitrogen source into a hydrochloric acid solution to obtain a mixed solution, adding a non-noble metal precursor solution into the mixed solution, adding an initiator in the stirring process, drying, and calcining in an inert gas atmosphere to obtain non-noble metal nitrogen-carbon single atoms; ultrasonically dispersing non-noble metal nitrogen-carbon single atoms in a hydrochloric acid solution, adding a platinum precursor, stirring for 10-14 hours, and drying to obtain an alloy precursor; and pyrolyzing the alloy precursor in a hydrogen atmosphere to obtain the sub-nano platinum-based alloy redox catalyst. In the patent, non-noble metal single atoms and a carbon-nitrogen layer on the surface are used for limiting the range, and the non-noble metal single atoms have high stability and dispersity, so that aggregation, migration andgrowth of Pt particles can be well avoided, and the Pt alloy with small particles and uniform dispersion is obtained.

Description

technical field [0001] The invention relates to the technical field of chemical materials, in particular to a method for preparing a subnano platinum-based ordered alloy. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has the characteristics of high energy conversion efficiency, low-temperature quick start, low noise, and no pollution. It can solve the environmental and energy problems brought about by the development of the automobile industry, and is very suitable as a power source for green new energy vehicles. It has brought new opportunities for the development of the automobile industry. Among them, Pt, as an efficient oxygen reduction catalyst, is widely used in the anode and cathode of fuel cells. Among the Pt / C catalysts commonly used in fuel cells, Pt-based catalysts account for a large proportion of Pt in fuel cell stacks due to their high Pt content. The cost ratio of the Pt / C catalyst is about 50%, making the cost of the Pt / C catalyst ...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88
CPCH01M4/9041H01M4/8825Y02E60/50
Inventor 魏子栋冯欣李静洪伟宋乐乐孙德恩
Owner CHONGQING UNIV
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