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Universal preparation method and application of active site combined with air electrode structure

A technology of active sites and air electrodes, applied in structural parts, battery electrodes, circuits, etc., can solve the problems of slow electrochemical reaction of oxygen, achieve high energy density, increase mass transfer rate, and increase reaction rate.

Inactive Publication Date: 2020-10-27
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A common problem in these battery storage technologies is the slow electrochemical reactions of oxygen involved in the battery cathode, including the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER)
The related research of this universal method combining highly active catalytic sites and excellent electrode structure has not been reported yet.

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  • Universal preparation method and application of active site combined with air electrode structure
  • Universal preparation method and application of active site combined with air electrode structure
  • Universal preparation method and application of active site combined with air electrode structure

Examples

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Effect test

Embodiment 1

[0053] A highly connected multi-level porous skeleton carbon microsphere loaded trace precious metal platinum catalyst, its precursor includes macropores, mesoporous, The highly interconnected hierarchical porous framework carbon microspheres inside the micropores; and the platinum chloride required for the in-situ reduction of loaded platinum nanoparticles to the above-mentioned internal highly interconnected hierarchical porous framework carbon microspheres prepared by the in situ loading noble metal method acid and reducing agent sodium borohydride.

[0054] The preparation method of the above-mentioned highly connected multi-level porous skeleton carbon microspheres loaded with a small amount of precious metal platinum catalyst is as follows: first, the polymer microspheres are cross-linked by carbon tetrachloride cross-linking method. The specific steps are as follows: 0.1g polymer microspheres and 30ml of carbon tetrachloride in a 50ml glass bottle, shake evenly at 70°C ...

Embodiment 2

[0056] A polyaniline array-coated hierarchical porous carbon microsphere air cathode catalyst, its precursor and the method used are hierarchical porous polymer microspheres and polyaniline coating prepared by concentrated sulfuric acid Aniline array coated sulfonated polymer microspheres, and nitrogen-containing polyaniline array hierarchical porous microspheres treated with ammonia gas activation.

[0057] The specific method of the above-mentioned polyaniline array-coated hierarchical porous carbon microsphere air cathode catalyst is as follows: the first step is to sulfonate the polymer microsphere with concentrated sulfuric acid sulfonation method, and the specific steps are: pour 50ml of concentrated sulfuric acid into Put 2.0g of polymer microspheres in a 100ml round-bottom flask, treat at 135°C for 5h, pour into 800ml of deionized water under stirring with a glass rod while it is hot, cool and filter, wash with a large amount of water until neutral, and dry at 60°C; In...

Embodiment 3

[0059] A nitrogen-sulfur double-doped carbon-based hierarchical porous carbon microsphere air cathode catalyst, the precursors of which are dopamine hydrochloride and mercaptoethylamine, and the methods used are in-situ doping heteroatom method and ammonia gas activation method.

[0060] The preparation method of the above-mentioned nitrogen-sulfur double-doped carbon-based hierarchical porous carbon microsphere air cathode catalyst is as follows: the first step is to mix 0.4g polymer microsphere, 0.8g dopamine hydrochloride and 30ml methanol for 5h, add 0.02M Tris buffer solution 150ml continued to stir for 12h, added 0.32g of mercaptoethylamine, 0.8g of dopamine hydrochloride and 50ml of 0.02M Tris buffer and continued to stir for 24h, filtered and washed, and dried at 60°C; in the second step, the above dopamine and mercaptoethylamine coated polymer The microspheres were activated by ammonia gas. The specific steps were as follows: carbonize the carbon-containing precursor o...

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Abstract

The invention relates to a universal preparation method for an active site-electrode structure integrated air electrode. The universal preparation method is characterized in that various polymer microspheres having open internally-communicating hierarchical-pore structures are conjugated with active sites like noble metal groups, transition metal groups, and hetero atom-doped carbon groups in virtue of different treatment methods; the different treatment methods may be one or more selected from the group consisting of a carbon tetrachloride cross-linking method, a concentrated-sulfuric-acid sulfonation method, a carbon dioxide gas activation method, a dopamine coating method, an ammonia gas activation method, a polyaniline coating method, an in-situ precious-metal loading method, an in-situ transition metallide growth method and an in-situ heteroatom doping method. The universal method described in the invention can flexibly conjugate open internally-communicating hierarchical-pore electrode structures containing super-macro pores, macro pores, meso pores and micropores with a plurality of different highly-active catalytic sites by using appropriate methods, so the catalytic performance of the air electrode and the overall performance of a fuel cell and a metal-air battery are improved.

Description

technical field [0001] The invention belongs to the preparation and application of air electrode catalysts, in particular to an air electrode catalyst comprising an open multi-level porous electrode structure connected with super-macropores, macropores, mesopores, and micropores combined with highly efficient catalytic active sites preparation methods and applications. Background technique [0002] With the gradual depletion of global fossil fuels and the increasingly serious environmental problems, rational and full use of renewable clean energy has become the goal pursued by people. However, the intermittency of these renewable clean energy sources limits their wide application worldwide, so the development and design of new and efficient energy storage devices is the key to solving this problem. Although lithium-ion batteries are widely used at present, due to the limitation of the intercalation energy storage mechanism, the energy density is low, which cannot meet the n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/86H01M4/90
CPCH01M4/8605H01M4/861H01M4/88H01M4/90Y02E60/50
Inventor 周克斌程丹王哲
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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