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Method and application of metal phthalocyanine molecular precursors to construct single-site electrocatalysts

An electrocatalyst, metal phthalocyanine technology, applied in the field of electrocatalysis, can solve the problems of low metal loading per site, metal atom agglomeration, low catalytic activity, etc.

Active Publication Date: 2020-10-16
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current single-site electrocatalysts still have many disadvantages, such as easy aggregation of metal atoms during the preparation process, poor stability, low single-site metal loading, or low catalytic activity.

Method used

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  • Method and application of metal phthalocyanine molecular precursors to construct single-site electrocatalysts
  • Method and application of metal phthalocyanine molecular precursors to construct single-site electrocatalysts
  • Method and application of metal phthalocyanine molecular precursors to construct single-site electrocatalysts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] According to the molar ratio of 1:4, zinc nitrate (6 mmol) and 2-methylimidazole (24 mmol) were respectively weighed and dissolved in 75 mL of anhydrous methanol under the assistance of ultrasound. Then 72.4 mg of iron phthalocyanine was weighed and dissolved in 10 mL of N,N-dimethylformamide solution under ultrasonication. The 2-methylimidazole solution was added to the zinc nitrate solution. Then, the iron phthalocyanine solution was slowly added dropwise into the aforementioned mixed solution, and stirred at room temperature for 18 h under the action of magnetic stirring. Centrifuge the obtained catalyst precursor under high-speed centrifugation, wash and centrifuge three times with N,N-dimethylformamide and methanol respectively, and freeze the above solid in liquid nitrogen, and then freeze-dry it in a freeze dryer for 24 hours . Finally, the dried solid powder was placed in a tube furnace, and under the protection of argon, the temperature was raised to 1000° C....

Embodiment 2

[0079]According to the molar ratio of 1:4, zinc nitrate (6 mmol) and 2-methylimidazole (24 mmol) were respectively weighed and dissolved in 75 mL of anhydrous methanol under the assistance of ultrasound. Then weigh 72.4 mg of octacyanoiron phthalocyanine and dissolve it in 10 mL of N,N-dimethylformamide solution under the action of ultrasound. The 2-methylimidazole solution was added to the zinc nitrate solution. Then, the cyanoiron phthalocyanine solution was slowly added dropwise to the aforementioned mixed solution, and stirred at room temperature for 18 h under the action of magnetic stirring. Centrifuge the obtained catalyst precursor under high-speed centrifugation, wash and centrifuge three times with N,N-dimethylformamide and methanol respectively, and freeze the above solid in liquid nitrogen, and then freeze-dry it in a freeze dryer for 24 hours . Finally, the dried solid powder was placed in a tube furnace, and under the protection of argon, the temperature was ra...

Embodiment 3

[0086] According to the molar ratio of 1:4, zinc nitrate (5.88mmol), iron nitrate (0.12mmol) and 2-methylimidazole (24mmol) were weighed respectively, and dissolved in 75mL of anhydrous methanol under the assistance of ultrasound. Then weigh 72.4 mg of octacyanoiron phthalocyanine and dissolve it in 10 mL of N,N-dimethylformamide solution under the action of ultrasound. Add the 2-methylimidazole solution to the mixed solution of zinc nitrate and ferric nitrate. Then, the cyanoiron phthalocyanine solution was slowly added dropwise into the mixed solution of 2-methylimidazole, zinc nitrate and ferric nitrate, and stirred at room temperature for 18 h under the action of magnetic stirring. Centrifuge the obtained catalyst precursor under high-speed centrifugation, wash and centrifuge three times with N,N-dimethylformamide and methanol respectively, and freeze the above solid in liquid nitrogen, and then freeze-dry it in a freeze dryer for 24 hours . Finally, the dried solid powd...

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Abstract

The invention provides a method for constructing a single-site electrocatalyst by a metal phthalocyanine molecular precursor and application. The method comprises subjecting a zeolitic imidazolate framework structure material and metal phthalocyanine molecules to coordination reaction; and subjecting a coordination reaction product to pyrolysis to obtain the electrocatalyst. The zeolitic imidazolate framework structural material includes a metal site to be coordinated and an imidazole nitrogen site to be coordinated. The method subjects the zeolitic imidazolate framework structural material (ZIFs) with high specific surface area and the metal phthalocyanine molecules with high stability to coordination reaction, significantly increases the number of active sites of the catalyst, and can avoid the aggregation of metal atoms. The prepared electrocatalyst has the advantages of high metal load capacity per site, good stability, and high catalytic activity.

Description

technical field [0001] The present invention relates to the field of electrocatalysis. Specifically, the present invention relates to a method and application of a single-site electrocatalyst constructed by a metallophthalocyanine molecular precursor. More specifically, the present invention relates to a method for constructing a single-site electrocatalyst by a metallophthalocyanine molecular precursor. Preparation method and method for catalyzing oxygen reduction. Background technique [0002] With the rapid development of society, human's demand for energy is increasing day by day, and traditional fossil energy is gradually difficult to meet the demand due to problems such as non-renewability and limited reserves. At the same time, harmful gases such as carbon dioxide, sulfur dioxide, and nitrogen oxides produced during the use of fossil fuels have made environmental problems increasingly serious. Therefore, it is very necessary to develop renewable and sustainable energ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/88H01M4/9008Y02E60/50
Inventor 梁永晔王洋
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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