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Preparation method of oxygen reduction and oxygen evolution bifunctional catalyst

A dual-functional catalyst and oxygen evolution technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as inconvenience, metals reduce the high catalytic activity of nanomaterials, and limit catalyst performance

Active Publication Date: 2021-08-13
WEIFANG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the high-temperature carbonization process of precursors, the chemical bonds between metal elements and other elements are broken, resulting in agglomeration and growth of metals, which reduces the high catalytic activity of nanomaterials and limits the further improvement of the performance of such catalysts.
[0006] In summary, there are obviously inconveniences and defects in the actual use of the existing technology, so it is necessary to improve

Method used

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  • Preparation method of oxygen reduction and oxygen evolution bifunctional catalyst
  • Preparation method of oxygen reduction and oxygen evolution bifunctional catalyst
  • Preparation method of oxygen reduction and oxygen evolution bifunctional catalyst

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preparation example Construction

[0020] The invention provides a method for preparing an oxygen reduction and oxygen evolution dual-functional catalyst, comprising the following preparation steps:

[0021] Step 1 Synthesis of spherical Prussian blue analogs

[0022] Weigh two transition metal salts, dissolve the two transition metal salts in deionized water at the same time to form mixed solution A, then weigh potassium cyanide and structure directing agent and dissolve them in deionized water to prepare solution B. Mix solution A and solution B, stir evenly, and let stand to react. The product is taken out, washed, and freeze-dried to obtain a dry precursor, which is a spherical Prussian blue analogue.

[0023] Metals in transition metal salts include Cu, Ni, Fe, Co, Cr, Zn, Ag; salts in transition metal salts include nitrates, acetates, chlorides or sulfates. For example: nitrate, acetate, chloride or sulfate of Cu, nitrate, acetate, chloride or sulfate of Ni, nitrate, acetate, chloride or sulfate of Fe, ...

Embodiment 1

[0037](1) Weigh 0.2 g of cobalt acetate tetrahydrate and 0.1 g of nickel acetate tetrahydrate and dissolve them in 100 mL of deionized water as solution A.

[0038] (2) Weigh 0.2 g of potassium ferricyanide and 3.5 g of sodium lauryl sulfate and dissolve them in 100 mL of deionized water as solution B.

[0039] (3) Solution A and solution B were mixed and kept stirring for 15 min, then left to stand at room temperature for 24 h, and then the solution and the precipitate were centrifuged and washed three times with deionized water to obtain the Prussian blue analog powder.

[0040] (4) The powder was mixed with 8 g of urea and placed in an argon-protected tube furnace. The temperature was raised to 600° C., kept for a period of time, and then naturally cooled to room temperature to obtain a carbon nanotube catalyst.

Embodiment 2

[0042] (1) Weigh 0.4 g of ferric acetate hydrate and 0.2 g of nickel acetate tetrahydrate and dissolve them in 100 mL of deionized water as solution A.

[0043] (2) Dissolve 0.2 g potassium cobaltcyanide and 3.0 g polyvinylpyrrolidone in 100 mL deionized water as solution B.

[0044] (3) Solution A and solution B were mixed and kept stirring for 15 min, then left to stand at room temperature for 24 h, and then the solution and the precipitate were centrifuged and washed three times with deionized water to obtain the Prussian blue analog powder.

[0045] (4) The powder was mixed with 8 g of melamine and placed in an argon-protected tube furnace, the temperature was raised to 800 ° C, and after a period of heat preservation, it was naturally cooled to room temperature to obtain a carbon nanotube catalyst.

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Abstract

The invention is applicable to the field of chemical catalysis, and provides a preparation method of an oxygen reduction and oxygen evolution bifunctional catalyst, which comprises the following steps: dissolving hydrated cobalt acetate and hydrated nickel acetate salt in water to obtain a mixed solution A; dissolving potassium ferricyanide and lauryl sodium sulfate in water to obtain a mixed solution B, then mixing the solution A and the solution B, performing a standing reaction, and drying a product to obtain a precursor, wherein the precursor is a spherical Prussian blue analogue; and mixing the precursor with a nitrogen source, placing the mixture in nitrogen, and carrying out pyrolysis and carbonization to generate carbon nanotubes, so as to obtain the oxygen reduction and oxygen evolution bifunctional catalyst. Therefore, the Prussian blue analogue nanospheres are used as the precursor, metal agglomeration in the carbonization process can be effectively reduced, finer carbon nanotubes can be obtained, and when the catalyst is applied to oxygen reduction and oxygen evolution catalytic reactions, the reaction potential barrier can be obviously reduced, and the reaction rate can be increased.

Description

technical field [0001] The invention relates to the technical field of chemical catalysis, in particular to a preparation method of an oxygen reduction and oxygen precipitation bifunctional catalyst. Background technique [0002] Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are the main electrode reactions during the positive electrode discharge and charge of fuel cells and metal-air batteries, so the performance of the catalyst plays a crucial role in the performance of the battery. [0003] At present, commercial platinum carbon and noble metals such as ruthenium and iridium and their alloy catalysts are considered to be the most effective electrocatalysts for ORR and OER. However, the large-scale application of noble metal catalysts is limited due to issues such as cost and stability. Therefore, the development of non-noble metal cathode catalysts with low development cost, simple process, high catalytic activity and good stability is of great impo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88B01J27/24B01J35/02B01J35/00
CPCH01M4/90H01M4/88B01J27/24B01J35/33B01J35/40Y02E60/50
Inventor 李成杰袁金秀胡静张英超韩维华付耀美
Owner WEIFANG UNIV OF SCI & TECH
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