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Preparation method and application of a fuel cell non-noble metal cathode catalyst

A cathode catalyst, non-precious metal technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reduced catalytic activity, limited accessibility of reactants, etc., achieving high consistency, simple and controllable preparation methods, ultra-high The effect of output power

Active Publication Date: 2021-12-28
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The single-atom transition metal-doped M-N-C derived from MOF has excellent catalytic activity for oxygen reduction, but the active sites of the obtained catalysts are mostly based on micropore-confined single-atom M-Nx, which greatly limits the availability of reactants. Contact, leading to a significant reduction in catalytic activity, therefore, the development of higher catalytic activity and high utilization of M-N-C catalysts is the key to realizing high-power fuel cells

Method used

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  • Preparation method and application of a fuel cell non-noble metal cathode catalyst
  • Preparation method and application of a fuel cell non-noble metal cathode catalyst
  • Preparation method and application of a fuel cell non-noble metal cathode catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0035] (1) Take 9.52 g Zn(NO 3 ) 2 ·6H 2 O was dissolved in 240 mL of methanol and stirred thoroughly to obtain solution A, and 10.512 g of 2-methylimidazole was dissolved in 120 mL of methanol and stirred sufficiently to obtain solution B. Mix solution A and solution B, stir vigorously for 1 hour, then add the white emulsion into the inner tank of 50 mL PTFE reactor, each inner tank is about 30 mL, put the assembled reactor into a blast drying oven, 120 ℃ insulation 4h. Centrifuge, wash and dry to prepare ZIF-8.

[0036](2) Weigh 25 mg of iron (II) acetate, 500 mg of 1,10-phenanthroline, and 2000 mg of ZIF-8 into a beaker at a ratio of 1:20:80. Add 100 mL of methanol, 20 mL of deionized water, and stir for 2h. Then put it into a water bath, spin evaporate at 85°C, put the evaporated powder into a blast drying oven, and obtain Fe-ZIF overnight at 60°C.

[0037] (3) Weigh 2 g of Fe-ZIF powder into the agate ball mill jar, then add 100 g of ball milling beads, that is, the...

Embodiment 2

[0050] The difference between this example and Example 1 is that the mass of 2-methylimidazole added in step 1 is 21.024 g.

Embodiment 3

[0052] The difference between this example and Example 1 is that the hydrothermal reaction temperature in step 1 is 160°C.

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PUM

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Abstract

The invention discloses a preparation method and application of a non-precious metal cathode catalyst material for a fuel cell. The method comprises: preparing a zeolite imidazolate metal-organic framework polymer; preparing a transition metal-containing metal-organic framework polymer by liquid phase adsorption; ball milling; liquid Phase recrystallization; high temperature pyrolysis under inert atmosphere. It is also disclosed that the catalyst prepared by the above method is in H 2 -O 2 Applications in fuel cells and methanol fuel cells. The material of the present invention has abundant active sites and an excellent multi-level pore structure; by introducing ball milling and liquid phase recrystallization methods, the M-N-C material obtained from the pyrolysis of metal-organic frameworks adsorbed with transition metals is rich in The mesoporous structure and more transition metal single atoms on the surface provide more active sites, and show excellent electrochemical performance when applied to fuel cell cathodes.

Description

technical field [0001] The invention relates to a preparation method and application of an electrode catalyst, in particular to a preparation method and application of a fuel cell non-noble metal cathode catalyst. Background technique [0002] A fuel cell is a device that converts chemical energy in chemicals into electrical energy. Due to its high energy conversion efficiency, low environmental pollution and high controllability, it has attracted much attention. However, the widely used commercial fuel cell electrocatalysts are still dominated by precious metals (platinum, rhodium, palladium, iridium, etc.). It is of great significance to develop catalyst materials free of noble metals. [0003] Early researchers found that transition metal-doped nitrogen-carbon materials have excellent catalytic activity, especially in oxygen reduction. In this regard, researchers have carried out a lot of research here, the most representative of which is transition metal-doped nitrogen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/88H01M4/9041H01M4/9083Y02E60/50
Inventor 刘建国吴永康李佳张天任曹寅亮王胜平张树国徐淳川赵海敏
Owner NANJING UNIV