Nitrogen-doped nano carbon electrocatalyst for fuel cell, and preparation and application of nitrogen-doped nano carbon electrocatalyst

A nitrogen-doped nano-carbon, electrocatalyst technology, applied in battery electrodes, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as no catalytic effect, achieve low cost, change microstructure, and good catalytic activity and stability effects

Active Publication Date: 2013-04-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the ordered mesoporous carbon prepared by polyaniline has almost no catalytic effect on the oxygen reduction reaction of fuel cells.

Method used

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  • Nitrogen-doped nano carbon electrocatalyst for fuel cell, and preparation and application of nitrogen-doped nano carbon electrocatalyst
  • Nitrogen-doped nano carbon electrocatalyst for fuel cell, and preparation and application of nitrogen-doped nano carbon electrocatalyst
  • Nitrogen-doped nano carbon electrocatalyst for fuel cell, and preparation and application of nitrogen-doped nano carbon electrocatalyst

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Experimental program
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Effect test

preparation example Construction

[0036] Preparation of working electrode

[0037] After mixing 5mg of catalyst, 1ml of absolute ethanol, and 50μl of 5% Nafion solution, ultrasonically oscillate evenly, and disperse 10μl of the mixed solution to an area of ​​0.1256cm 2 The glassy carbon (GC) disk electrode surface was dried to obtain a thin film electrode.

[0038] Stability Accelerated Test Method

[0039] The stability of the catalyst was evaluated in the following way: the N 2 Dissolve in the electrolyte until the electrolyte is saturated, then cycle CV scan from 0-1.0V vs. SHE (scan rate: 50mV / s, scan number: 1000 times). Before and after the scan, the oxygen reduction polarization curve of the catalyst was tested.

[0040] Test method for oxygen reduction polarization performance in proton exchange membrane fuel cell

[0041] Dissolve oxygen in 0.5M H 2 SO 4 In the electrolyte until the electrolyte is saturated, the current is measured by scanning from the open circuit voltage (OCV) in the negative ...

Embodiment 1

[0046] 2.5g of polyvinylpyrrolidone (PVP) was uniformly dispersed in aqueous ethanol (50mL 2 h 5 OH+15mL H 2 O), after stirring for 1 h, add dropwise aniline hydrochloride solution (5mL aniline+3mL 37.5% HCl+14mL H 2 O) 10 mL. After stirring for 30 minutes, 1mol / L HCl solution was added dropwise to adjust the pH of the solution to 3.0. After 1 h of reaction, 25 mL of 0.5 mol / L (NH 4 ) 2 S 2 o 8 The solution was slowly dropped into the above solution, and then 0.36g Co(NO 3 ) 2 ·6H 2 O, after stirring evenly, polymerize at room temperature for 12 hours to obtain a polyaniline solution. Evaporate the polyaniline solution to dryness, wash it, and dry it at 85°C, then treat it in an ammonia atmosphere at 800°C for 3 hours to obtain a black powder; put the above powder into a 1M acidic aqueous solution, treat it with acid for 1 hour, and wash The metal in the catalyst; then it is ball-milled with a ball mill for 3 hours to obtain a doped nano-carbon electrocatalyst with ...

Embodiment 2

[0048] Evenly disperse 2.5g of PVP-K30 in aqueous ethanol (50mL C 2 h 5 OH+15mL H 2 O), stirring

[0049] After 1h, add the now prepared aniline hydrochloride solution (5mL aniline+3mL 37.5% HCl+14mL HCl) dropwise 2 O) 10 mL. After stirring for 30 minutes, 1mol / L HCl solution was added dropwise to adjust the pH of the solution to 3.0. After 1 h of reaction, 25 mL of 0.5 mol / L (NH 4 ) 2 S 2 o 8 The solution was slowly dropped into the above solution, and then 0.35g Fe(NO 3 ) 3 ·6H 2 O, after stirring evenly, polymerize at room temperature for 12 hours to obtain a polyaniline solution. The polyaniline solution was evaporated to dryness at 60°C; after drying at 85°C, it was treated in an ammonia atmosphere at 800°C for 3 hours to obtain a black powder; washing the metals in the catalyst; and then ball milling them with a ball mill for more than 3 hours to obtain a doped nano-carbon electrocatalyst with an ordered nanostructure. The nitrogen content is 6.4%.

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Abstract

The invention relates to a nitrogen-doped nano carbon electrocatalyst for a fuel cell, and preparation and application of the nitrogen-doped nano carbon electrocatalyst. The electrocatalyst is prepared by adopting the steps of: with phenylamine as a reaction precursor, mixing the phenylamine, a surfactant and a soluble transition metal salt and then polymerizing under acidic and high-oxidization conditions, carrying out high-temperature carbonization on the polymer under the protection of an inert gas and / or ammonia atmosphere after drying, and finally carrying out acid treatment. The preparation method of the electrocatalyst is simply and easily controlled, and the mass production is easily realized. The nitrogen-doped nano carbon electrocatalyst has better oxygen reduction catalytic activity, stability and selectivity in an acidic medium fuel cell compared with Pt / C, and has higher catalytic activity and stability in an alkaline medium fuel cell compared with commercialized Pt / C. In addition, the nitrogen-doped nano carbon electrocatalyst also has the advantages of low cost and high anti-poisoning property, and is capable of replacing platinum to be used as a fuel cell oxygen reduction electrocatalyst.

Description

technical field [0001] The invention relates to a fuel cell electrocatalyst, in particular to a nitrogen-doped nano-carbon electrocatalyst for a fuel cell, a preparation method and application thereof. Background technique [0002] Energy is an important foundation for the sustainable development of the national economy and national security. With the development of the economy, the demand for energy is increasing day by day. The environmental pressure caused by the massive consumption of fossil energy is becoming more and more prominent. Therefore, saving fossil energy, improving the efficiency of fossil energy utilization, realizing energy conservation and emission reduction, as well as researching and developing large-scale utilization of renewable energy and realizing energy diversification have become important strategies for energy security and sustainable development of countries around the world. [0003] A fuel cell is an electrochemical power generation device th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/00H01M4/90
CPCY02E60/50
Inventor 张华民钟和香王美日柳丝丝
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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