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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 electrical components, battery electrodes, circuits, etc., can solve the problems of unfavorable large-scale production of catalysts, unfavorable dispersion of active sites, complicated preparation methods, etc., and achieve good metal dispersion and multi-level porous Pore ​​structure characteristics, effects of high electrochemical stability

Active Publication Date: 2019-06-28
XUZHOU NORMAL UNIVERSITY
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  • Description
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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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  • Non-noble metal oxygen reduction reaction catalyst with highly dispersed metal active sites and preparation method thereof
  • Non-noble metal oxygen reduction reaction catalyst with highly dispersed metal active sites and preparation method thereof
  • 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 200mg heme in 100mL NaOH solution in a beaker (the concentration of NaOH is 0.1mol 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 roo...

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Abstract

The invention discloses a non-noble metal oxygen reduction reaction catalyst with highly dispersed metal active sites and a preparation method thereof. An active-site high-dispersion non-noble metal catalyst is prepared by taking calcium oxide (CaO) or magnesium oxide (MgO) as a template and taking Fe or Co-containing natural product heme or vitamin B12 (VB12) and different sulfur sources as catalyst precursors, wherein calcium oxide (CaO) or magnesium oxide (MgO) is generated in site. The preparation method is simple in process and low in cost, and is suitable for large-scale application. Thecatalyst prepared by the method disclosed by the invention has the characteristics of a multi-stage porous pore structure and a high specific surface area, and is also good in metal dispersity. The catalyst shows relatively high catalytic activity on an oxygen reduction reaction, and has relatively high catalytic selectivity and electrochemical stability. The catalyst has ORR performance superiorto commercial Pt / C, and can be applied to fuel cells and metal air cells.

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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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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