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An oxygen reduction catalyst prepared based on tetra-β-(4-formylphenoxy)cobalt phthalocyanine airgel and its preparation method

A technology of aldehyde phenoxy and cobalt phthalocyanine, which is applied in the field of oxygen reduction catalysts and its preparation, can solve the problems of difficulty in maintaining large-scale production of fuel cells, limiting the development of fuel cells, and high prices, and achieves good oxygen reduction catalytic activity , good electrocatalytic performance, and the effect of reducing production costs

Active Publication Date: 2022-04-22
CAPITAL NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cathode oxygen reduction reaction, as the key to fuel cells, has slow reaction kinetics and causes activation loss, which limits the development of fuel cells.
[0003] However, traditional fuel cells mostly use Pt-based catalysts, but as a noble metal, Pt is not only expensive, but also has scarce reserves, making it difficult to maintain commercial mass production of fuel cells.

Method used

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  • An oxygen reduction catalyst prepared based on tetra-β-(4-formylphenoxy)cobalt phthalocyanine airgel and its preparation method
  • An oxygen reduction catalyst prepared based on tetra-β-(4-formylphenoxy)cobalt phthalocyanine airgel and its preparation method
  • An oxygen reduction catalyst prepared based on tetra-β-(4-formylphenoxy)cobalt phthalocyanine airgel and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 1) Add 0.06 g of tetrakis-β-(4-formylphenoxy)cobalt phthalocyanine into 2 mL of N,N-dimethylformamide, and disperse ultrasonically in a 40KHz ultrasonic apparatus for 8 minutes to obtain a crosslinking agent solution.

[0055] 2) In 4g of a mixed aqueous solution containing 1wt% acetic acid and 3wt% chitosan, add the above-mentioned cross-linking agent solution, and obtain a dark green hydrogel after rapid shaking, soak the prepared hydrogel in 300mL deionized water Remove excess solvent for 6 hours, continue to soak in 10 mL of 5 mg / mL graphene oxide aqueous solution for 6 hours, and obtain a composite hydrogel by electrostatic adsorption.

[0056] 3) The obtained composite hydrogel was freeze-dried at -57°C for 18 hours to obtain a light green composite aerogel.

[0057] 4) Under the protection of high-purity argon, the obtained composite airgel was subjected to high-temperature heat treatment at 600°C, 700°C, 800°C, and 900°C for 2 hours to obtain a black powder prod...

Embodiment 2

[0062] Sample 1: CS / CoPc / GO

[0063] 1) Add 0.06g tetrakis-β-(4-formylphenoxy)cobalt phthalocyanine to 2mL N,N-dimethylformamide, and ultrasonically disperse in a 40KHz ultrasonic apparatus for 10min to obtain a crosslinking agent solution.

[0064] 2) In 4g of a mixed aqueous solution containing 1wt% acetic acid and 3wt% chitosan, add the above-mentioned crosslinking agent solution, and obtain a dark green hydrogel after rapid shaking, soak the prepared hydrogel in 300mL deionized water Remove excess solvent for 6 hours, continue soaking in 10ml of 5mg / mL graphene oxide aqueous solution for 6 hours, and obtain composite hydrogel by electrostatic adsorption.

[0065] 3) After the obtained composite hydrogel was freeze-dried at -57°C for 24 hours, the light green composite airgel was obtained, which was the sample CS / CoPc / GO.

[0066] Sample 2: Co / N / C-800(noneGO)

[0067] 1) Add 0.06g tetrakis-β-(4-formylphenoxy)cobalt phthalocyanine to 2mL N,N-dimethylformamide, and ultrason...

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Abstract

The invention relates to the technical field of catalyst preparation, and provides a method for preparing an oxygen reduction catalyst based on tetra-β-(4-formylphenoxy)cobalt phthalocyanine airgel: (1) combining tetra-β-(4- Aldehydephenoxy) cobalt phthalocyanine, organic solvent and acetic acid-amino-rich organic mixture are mixed to obtain a hydrogel; (2) immerse the hydrogel obtained in step (1) in water to remove excess solvent, and take out the hydrogel Immerse in graphene oxide solution or multi-walled carbon nanotube solution again and carry out adsorption, obtain composite hydrogel; (3) carry out freeze-drying to the composite hydrogel obtained in step (2), obtain composite aerogel; (4 ) Under a protective atmosphere, the composite airgel obtained in step (3) is subjected to high heat treatment to obtain an oxygen reduction catalyst. The invention also provides the oxygen reduction catalyst obtained by the method, which contains N, C and Co at the same time, and the raw materials are easy to obtain and easy to implement. The product of the invention has excellent electrochemical performance and catalytic performance.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to an oxygen reduction catalyst prepared based on tetra-beta-(4-formylphenoxy)cobalt phthalocyanine airgel and a preparation method thereof. Background technique [0002] Fuel cells have many advantages such as cleanness and high efficiency, and are considered to be one of the most promising green energy sources. However, the oxygen reduction reaction at the cathode, as the key to fuel cells, has slow reaction kinetics and causes activation loss, which limits the development of fuel cells. [0003] However, traditional fuel cells mostly use Pt-based catalysts, but as a noble metal, Pt is not only expensive, but also has scarce reserves, making it difficult to maintain commercial mass production of fuel cells. Contents of the invention [0004] The purpose of the present invention is to provide a method for preparing an oxygen reduction catalyst based on airgel and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/10B01J37/08B01J37/34
CPCB01J27/24B01J37/082B01J37/343B01J35/33B01J35/615
Inventor 左霞付媛媛于越
Owner CAPITAL NORMAL UNIVERSITY
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