Oxygen reduction catalyst and preparation method thereof

A catalyst, sodium hydroxide technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of complex preparation method, and achieve the effect of simple preparation method, convenient operation, and catalytic activity of aerobic reduction

Inactive Publication Date: 2021-05-28
武汉度美迪新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides an oxygen reduction catalyst and its preparation method, so that Co nanoparticles, and S and N elements are highly dispersed in the porous carbon matrix to form abundant Co-N-C oxygen reduction catalytic active centers , overcome the problem of complex preparation methods in the prior art

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  • Oxygen reduction catalyst and preparation method thereof

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Effect test

Embodiment 1

[0026] A preparation method of an oxygen reduction catalyst, characterized in that the preparation method comprises the following steps:

[0027] (1) Preparation of dithiocarboxylated polyethyleneimine: Add distilled water solvent, polyethyleneimine and sodium hydroxide into the reaction flask, stir well, place in a constant temperature water bath, stir at a constant speed at 30°C and slowly drop Add carbon disulfide and react for 2 hours. After the reaction is completed, add ethanol solvent until a flocculent product is precipitated, filter to remove the solvent, wash with distilled water and dry to obtain dithiocarboxylated polyethyleneimine;

[0028] Wherein, the molecular weight of polyethyleneimine is 1800; The mass ratio of polyethyleneimine, sodium hydroxide and carbon disulfide is 100:50:120;

[0029] (2) Preparation of dithiocarboxylated polyethyleneimine-cobalt chelate: adding pH to the reaction flask is 5 hydrochloric acid solution, then the molar concentration is 0...

Embodiment 2

[0036] A preparation method of an oxygen reduction catalyst, characterized in that the preparation method comprises the following steps:

[0037] (1) Preparation of dithiocarboxylated polyethyleneimine: Add distilled water solvent, polyethyleneimine and sodium hydroxide into the reaction flask, stir evenly, place in a constant temperature water bath, stir at a constant speed at 50°C and slowly drop Add carbon disulfide and react for 4 hours. After the reaction is completed, add ethanol solvent until a flocculent product is precipitated, filter to remove the solvent, wash with distilled water and dry to obtain dithiocarboxylated polyethyleneimine;

[0038] Wherein, the molecular weight of polyethyleneimine is 3000; The mass ratio of polyethyleneimine, sodium hydroxide and carbon disulfide is 100:80:200;

[0039] (2) the preparation of dithiocarboxylated polyethyleneimine-cobalt chelate: add the hydrochloric acid solution that pH is 6 in reaction flask, then the cobalt chloride ...

Embodiment 3

[0045] A preparation method of an oxygen reduction catalyst, characterized in that the preparation method comprises the following steps:

[0046] (1) Preparation of dithiocarboxylated polyethyleneimine: Add distilled water solvent, polyethyleneimine and sodium hydroxide into the reaction flask, stir evenly, place in a constant temperature water bath, stir at a constant speed at 40°C and slowly drop Add carbon disulfide and react for 3 hours. After the reaction is completed, add ethanol solvent until a flocculated product is precipitated, filter to remove the solvent, wash with distilled water and dry to obtain dithiocarboxylated polyethyleneimine;

[0047] Wherein, the molecular weight of polyethyleneimine is 3500; The mass ratio of polyethyleneimine, sodium hydroxide and carbon disulfide is 100:110:280;

[0048] (2) the preparation of dithiocarboxylated polyethyleneimine-cobalt chelate: add the hydrochloric acid solution that pH is 5 in reaction flask, then the cobalt chlorid...

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Abstract

The invention relates to an oxygen reduction catalyst and a preparation method thereof. According to the preparation method, a carbon chain of polyethyleneimine is used as a carbon source, amino and imino are used as nitrogen sources, and a dithiocarboxylic acid group in dithiocarboxylated polyethyleneimine obtained by modifying polyethyleneimine with carbon disulfide is used as a sulfur source, and the S-doped Co-N-C oxygen reduction catalyst is obtained through simple steps of chelation, high-temperature carbonization, high-temperature activation and the like. The preparation method provided by the invention is simple, and the prepared S-doped Co-N-C oxygen reduction catalyst has high initial potential, half-wave potential and limiting current density in an oxygen reduction reaction test, which indicates that the prepared oxygen reduction catalyst has better performance and wide application prospect.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to an oxygen reduction catalyst and a preparation method thereof. Background technique [0002] With the rapid consumption of fossil energy, the corresponding energy crisis and environmental pollution problems have become increasingly prominent, and the development of clean energy and new and efficient energy devices has become a top priority. In this context, new battery devices such as lithium-ion batteries, supercapacitors, and zinc-air batteries have been developed and used one after another, which have greatly improved energy storage and conversion efficiency. Zinc-air battery is an energy device with broad application prospects, and has attracted more and more attention due to its advantages such as high specific energy density and high safety performance. The cathode reaction in a zinc-air battery is usually an oxygen reduction reaction, but the kinetics of the oxygen ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/031C25B11/042C25B1/04B22F9/20
CPCB22F9/20C25B1/04C25B11/04Y02E60/36
Inventor 熊浩陆月琴钟小泉
Owner 武汉度美迪新能源科技有限公司
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