Preparation method for nitrogen-doped porous carbon supported non-noble metal electrocatalyst and electrocatalyst application

A nitrogen-doped porous carbon, non-precious metal technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as the gap in electrochemical activity, and achieve the effect of enhancing oxygen reduction activity, simple operation, and easy control.

Inactive Publication Date: 2017-06-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example: Chinese patent CN102013495A discloses the preparation method of hemin loaded on activated carbon powder, which can be applied to alkaline ethanol fuel cells. There is still a certain gap in the activity of electrocatalysts

Method used

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  • Preparation method for nitrogen-doped porous carbon supported non-noble metal electrocatalyst and electrocatalyst application
  • Preparation method for nitrogen-doped porous carbon supported non-noble metal electrocatalyst and electrocatalyst application
  • Preparation method for nitrogen-doped porous carbon supported non-noble metal electrocatalyst and electrocatalyst application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Preparation of nitrogen-doped porous carbon materials

[0036] Mix 2.8g of magnesium oxide, 1.2g of phenanthroline and 0.9g of adipic acid in 60mL of ethanol, ultrasonically disperse for 30min, and spin-evaporate at 25°C to obtain a white mixture, then roast at 900°C for 2h under argon , at 25°C, wash with 2M hydrochloric acid for 24 hours to remove the hard template, wash with water until neutral, and dry in a vacuum oven to obtain a nitrogen-doped porous carbon support;

[0037] 2) Loading transition metal macrocyclic compounds

[0038] Disperse 300mg of hemin in 25mL of ethanol, mix it with 700mg of the carbon material prepared in 1), ultrasonicate for 30min, at 50°C, after rotary evaporation, roast at 900°C for 2h under argon, at 80°C, 0.5 Wash with M sulfuric acid for 6 hours to remove impurities, wash with water until neutral, and dry overnight to obtain a supported non-precious metal electrocatalyst.

[0039] Such as figure 1 , the transmission electron mic...

Embodiment 2

[0044] 1) Preparation of nitrogen-doped porous carbon materials

[0045] Grind and mix 2.8g magnesium oxide, 1.2g o-phenanthroline and 0.9g adipic acid, then bake at 800°C for 2h under argon, wash with 2M hydrochloric acid for 24h at 25°C to remove the hard template, wash with water until neutral , to obtain a nitrogen-doped porous carbon carrier after drying in a vacuum oven;

[0046] 2) Loading transition metal macrocyclic compounds

[0047] Disperse 200mg of iron phthalocyanine in 25mL of ethanol, then mix it with 800mg of the carbon material prepared in 1), ultrasonicate for 60min, at 50°C, after rotary evaporation, roast at 800°C for 2h under argon, at 80°C, 0.5M sulfuric acid Wash for 6 hours to remove impurities, wash with water until neutral, and dry overnight to obtain a supported non-precious metal electrocatalyst.

[0048] Such as Figure 5 , The structural representation of the iron phthalocyanine used in the catalyst prepared in Example 2.

[0049] Such as F...

Embodiment 3

[0052]1) Preparation of nitrogen-doped porous carbon materials

[0053] Mix 0.33g of magnesium oxide, 2.1g of phenanthroline and 0.9g of terephthalic acid in 60mL of ethanol at 50°C. Wash with hydrochloric acid for 24 hours to remove the hard template, wash with water until neutral, and dry in a vacuum oven to obtain a nitrogen-doped porous carbon carrier;

[0054] 2) Loading transition metal macrocyclic compounds

[0055] Disperse 700mg of vitamin B12 in 25mL of methanol, then mix it with 300mg of the carbon material prepared in 1), ultrasonicate for 60min, at 50°C, after rotary evaporation, roast at 600°C for 4h under argon, at 25°C, 0.1M hydrochloric acid Impurities were removed for 30 minutes, washed with water until neutral, and dried overnight to obtain a supported non-precious metal electrocatalyst.

[0056] Such as Figure 7 , The structural representation of vitamin B12 used in the catalyst prepared in Example 3.

[0057] The morphology of the catalyst prepared in...

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Abstract

The invention discloses preparation method for nitrogen-doped porous carbon supported non-noble metal electrocatalyst. According to the method, magnesium oxide is taken as a hard template; mixture containing nitrogen ligands and polyacid is taken as a nitrogen source and a carbon source; mixture dispersion is carried out through an ultrasonic rotary evaporation method; carbonization is carried out through high temperature roasting; the template is removed through utilization of acid solution, thereby obtaining a porous carbon material; a non-noble metal macrocyclic compound and the porous carbon material are mixed through the rotary evaporation method; and the supported non-noble metal electrocatalyst is prepared through heat treatment and acid-washing. According to the method, the nitrogen-doped porous carbon material with a high specific surface area is taken as a carrier, thereby facilitating the dispersion of the metal-nitrogen/carbon in the non-noble metal macrocyclic compound and the mutual coordination effect between the carrier and the metal-nitrogen/carbon active site, so the oxygen reduction activity of the catalyst is greatly improved. The material has relatively high electrocatalytic activity for the oxygen reduction of a cathode of a fuel cell, the material has a potential application prospect and the commercial application process of the fuel cell is promoted.

Description

[0001] Technical field: [0002] The invention belongs to the field of fuel cell catalysts, and relates to the preparation and electrocatalytic application of nitrogen-doped porous carbon-loaded non-noble metal electrocatalysts. [0003] Background technique: [0004] At present, the catalysts used in fuel cells are still commercial platinum-based electrocatalysts. Due to the high price of platinum, low reserves, and easy poisoning, the commercialization of fuel cells has been greatly hindered. To this end, people began to study a non-precious metal electrocatalyst that can replace platinum-based catalysts. This type of catalyst mainly uses transition metals (iron and cobalt). However, the activity of the developed non-noble metal electrocatalysts cannot meet the requirements of the catalyst. [0005] Non-noble metal electrocatalysts are mainly divided into the following categories: 1) supported transition metal oxides; 2) doped carbon materials; 3) supported transition metal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCH01M4/9075H01M4/9083Y02E60/50
Inventor 谢妍金新新姜宇
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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