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Preparation method of oxygen reduction catalyst based on metal organic framework compound

A technology of metal-organic frameworks and compounds, which is applied in the field of preparation of multi-level porous oxygen reduction catalysts, can solve the problems such as the difficulty in introducing the second metal into uniformly distributed composite porous catalysts, and achieve the advantages of avoiding pore fusion and collapse, good conductivity, and uniform distribution Effect

Inactive Publication Date: 2021-06-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Generally, the pore structure of MOFs is determined by the relationship between transition metal species and ligands. The common one is single metal MOFs, and it is difficult to introduce a second metal to prepare a uniformly distributed composite porous catalyst.

Method used

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  • Preparation method of oxygen reduction catalyst based on metal organic framework compound
  • Preparation method of oxygen reduction catalyst based on metal organic framework compound

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preparation example Construction

[0043] The preparation method of the oxygen reduction catalyst using the metal organic framework compound as the template of the present invention is to prepare the metal organic framework compound with the first transition metal salt as the transition metal source and the indole carboxylic acid as the ligand; and the metal organic framework The compound is used as a template, and the transition metal coordination glucose-urea resin prepared by the second transition metal salt is used as another transition metal source, and a hierarchical porous structure oxygen reduction catalyst is obtained by using the barrier effect of the KCl-NaCl eutectic salt; the method is specific Include the following steps:

[0044] (1) Weigh 0.1mmol of indole carboxylic acid and 0.5-1mmol of the first transition metal salt, add them to a 100ml hydrothermal kettle; continue to add 90ml of deionized water, ultrasonically treat for 20min; then seal and heat to 120-180 ℃, continue to keep warm for 12-7...

Embodiment 1

[0050] Example 1: Preparation of Metal Organic Framework (MOF)

[0051] Weigh 0.1mmol of indole carboxylic acid and 0.5mmol of cobalt nitrate into a 100ml hydrothermal kettle, add 90ml of deionized water, after ultrasonic treatment for 20min, seal and heat to 120°C, keep warm for 12h, after natural cooling, use deionized water Wash thoroughly, filter with suction, and dry in vacuum at 90°C for 12 hours to obtain cobalt-coordinated indole carboxylic acid.

Embodiment 2

[0052] Example 2: Preparation of nickel-coordinated glucose-urea resin prepolymer solution

[0053] According to the mass ratio of nickel nitrate, urea, glucose and deionized water is 1:8:8:100, get nickel nitrate (1g), urea, glucose and join in the deionized water (100ml), then ultrasonic vibration mixing 30 minutes, Dissolve nickel nitrate, urea and glucose, and polymerize at 90° C. for 40 minutes to obtain a nickel-coordinated glucose-urea resin prepolymer solution (containing 17 g of resin prepolymer).

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Abstract

The invention relates to the preparation of a fuel cell non-noble metal catalyst, and aims to provide a preparation method of an oxygen reduction catalyst based on a metal organic framework compound. The metal-organic framework compound is prepared by using the first transition metal salt as the transition metal source and indole carboxylic acid as the ligand; the transition metal coordination glucose-urea resin prepared by the second transition metal salt is immersed in the gap of the former, and the KCl The barrier effect of ‑NaCl eutectic salt obtains a hierarchical porous structure oxygen reduction catalyst. The invention adopts a hydrothermal method to synthesize, and can obtain MOFs particles with uniform size and uniform distribution. The active sites of the metals in the bimetallic catalyst of the invention are separated from each other but evenly distributed, and can perform their duties more effectively and improve performance. Avoiding pore fusion and collapse is conducive to the formation of a uniformly distributed catalytic multi-level pore inner surface, and a more balanced pore size distribution. The eutectic salt template can be removed by washing with water and can be reused. Improve the conductivity of the catalyst, especially suitable for high current working conditions.

Description

technical field [0001] The invention relates to the preparation of non-precious metal catalysts for fuel cells, in particular to a method for preparing a hierarchical porous oxygen reduction catalyst using metal organic framework compounds and transition metal coordination resins as precursors and using KCl and NaCl eutectic salts as templates. Background technique [0002] In recent years, due to innovative breakthroughs in fuel cell (Fuel Cell) technology, coupled with multiple pressures such as environmental protection issues and energy shortages, governments of various countries and industries such as automobiles, electric power, and energy have gradually attached importance to the development of fuel cell technology. Fuel cell is a new power generation technology with high efficiency, low pollution, and diversified energy sources. The power generation system of fuel cell is not only lower in cost than traditional fossil fuels, but also has the advantages of cleanliness a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/8825H01M4/9008H01M4/9041H01M4/9083Y02E60/50
Inventor 李洲鹏黄珊珊刘宾虹
Owner ZHEJIANG UNIV