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A non-noble metal oxygen reduction reaction catalyst with highly dispersed metal active sites and preparation method thereof

A non-precious metal, metal active technology, applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of unfavorable large-scale production of catalysts, unfavorable dispersion of active sites, complicated preparation methods, etc., to achieve good metal dispersion, high electrical Chemical stability, low cost effect

Active Publication Date: 2021-12-17
XUZHOU NORMAL UNIVERSITY
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Problems solved by technology

However, the preparation methods described in these patents are still too complicated, which is not conducive to the large-scale production of catalysts, and the metal phases in the prepared catalysts are seriously agglomerated, which is not conducive to the dispersion of active sites.
Therefore, highly dispersed non-precious metal catalysts have high research value and application potential, but there are still great challenges

Method used

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  • A non-noble metal oxygen reduction reaction catalyst with highly dispersed metal active sites and preparation method thereof
  • A non-noble metal oxygen reduction reaction catalyst with highly dispersed metal active sites and preparation method thereof
  • A non-noble metal oxygen reduction reaction catalyst with highly dispersed metal active sites and preparation method thereof

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Embodiment

[0026] A method for preparing a non-noble metal oxygen reduction reaction catalyst with highly dispersed metal active sites, comprising the following steps:

[0027] 1) 476mg MgCl 2 Ultrasonic dissolved in 10mL water to obtain a clear and transparent solution;

[0028] 2) Ultrasonic disperse 200 mg heme in 100 mL NaOH solution in a beaker (NaOH concentration is 0.1 mol L -1 ), to obtain a reddish-brown solution;

[0029] 3) The mixed solution obtained in step 2) is added dropwise to the obtained MgCl-containing solution obtained in step 1 under stirring conditions. 2 solution, the resulting solution was stirred for 30 min;

[0030] 4) Add 200 mg of L-cysteine ​​to the above solution, stir and ultrasonically oscillate to disperse evenly, stir and evaporate to dryness at 80°C, and then vacuum-dry at 80°C for 8 hours to obtain a brown-green powder;

[0031] 5) Put the above powder into a tube furnace, heat-treat at 800°C for 2h under a nitrogen atmosphere, and cool to room te...

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Abstract

A non-precious metal oxygen reduction reaction catalyst with highly dispersed metal active sites and a preparation method thereof, using calcium oxide (CaO) or magnesium oxide (MgO) generated in situ as a template, and natural product heme or heme containing Fe or Co Vitamin B12 (VB12) and different sulfur sources are used as catalyst precursors to prepare highly dispersed non-precious metal catalysts with active sites, the process is simple, the cost is low, and it is suitable for large-scale applications; the catalyst prepared by the invention has the characteristics of multi-level porous pore structure and High specific surface area, good metal dispersion, high catalytic activity for oxygen reduction reaction, high catalytic selectivity and electrochemical stability, ORR performance superior to commercial Pt / C, Can be used in fuel cells and metal-air batteries.

Description

technical field [0001] The invention relates to an oxygen reduction reaction catalyst, in particular to a non-noble metal oxygen reduction reaction catalyst with highly dispersed metal active sites and a preparation method thereof. Background technique [0002] With the depletion of fossil energy, clean energy has attracted great attention from all over the world. Fuel cells and metal-air batteries have the advantages of cleanliness, high efficiency, and high power density, and are widely used in vehicle power supplies, portable power supplies, and distributed power generation. Among them, the slow kinetics of the cathode oxygen reduction reaction (ORR) is the main factor limiting the wide application of fuel cells and metal-air batteries. For a long time, Pt has been used as cathode electrocatalyst, but the resources of Pt are limited and the price is high, and the commercialization of fuel cells and metal-air batteries is facing the problem of high cost. Therefore, the r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90
CPCY02E60/50
Inventor 刘飒杨峥高京夏陈晓文秦正龙朱平苏梓茜王思
Owner XUZHOU NORMAL UNIVERSITY
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