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Fe-N-C oxygen reduction catalyst and synthesizing method and application thereof

A synthesis method and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., to achieve the effects of reduced production costs, low prices, and simple synthesis processes

Active Publication Date: 2016-09-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for transition metal catalysts, the stability in acidic environment becomes the key to limit their application.

Method used

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  • Fe-N-C oxygen reduction catalyst and synthesizing method and application thereof
  • Fe-N-C oxygen reduction catalyst and synthesizing method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 2g melamine, 4g oxalic acid, 1g Fe(NO 3 ) 3 9H 2 O was added to 50ml of water, stirred and refluxed in an oil bath at 80°C for 6h. After mixing evenly, the mixture was suction filtered and dried in air at 70°C. in N 2 Calcined in a muffle furnace at 800 °C under the protection of atmosphere. The calcined samples were ground and placed in 0.5M H 2 SO 4 Medium treatment for 9h to remove easily soluble Fe components. Suction filter the product after acid removal, wash with deionized water several times, and dry in air to obtain Fe-N-C composite.

[0031] Weigh 0.008g of Fe-N-C complex, dissolve it in a mixed solution of 5% Nafion (perfluorosulfonic acid) and ethanol at a volume ratio of 10:1, mix evenly by ultrasonic, use a platinum sheet as a counter electrode, and a calomel electrode as a reference electrode Test material in 0.1M HClO 4 ORR activity in . The onset potential of ORR is 0.472V (VS.SCE), and the limiting current density is 5.5mAcm -2 .

[0032] ...

Embodiment 2

[0034] 3g dicyandiamide, 4g oxalic acid, 0.7g FeCl 3 ·6H 2 O was added to 50ml of water, stirred and refluxed in an oil bath at 80°C for 6h. After mixing evenly, the mixture was filtered and dried in air at 70°C. in N 2 Calcined in a muffle furnace at 900°C under atmosphere protection. The calcined samples were ground and placed in 0.5M H 2 SO 4 Medium treatment for 9h to remove easily soluble Fe components. The product after acid removal is suction filtered, washed with deionized water several times, and dried in air.

[0035] The obtained Fe-N-C complex, 5% Nafion and ethanol were mixed in a certain proportion and then ultrasonically mixed evenly. The platinum sheet was used as the counter electrode, and the calomel electrode was used as the reference electrode. The test material was in 0.1M HClO 4 ORR activity in . The onset potential of ORR is 0.46V0(VS.SCE), and the limiting current density is 5.4mA.cm -2 .

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Abstract

The invention discloses a synthesizing method, a preparation method and application of a Fe-N-C oxygen reduction catalyst. The synthesizing method comprises the following steps that 1, a carbon-nitrogen precursor, a morphology control agent and soluble ferric salt are added into water, heating and stirring are conducted for reacting, suction filtration is conducted after reacting is complete, and drying is conducted to a solid substance; 2, the solid substance obtained in the step 1 is calcined to obtain a catalyst precursor; 3, the catalyst precursor obtained in the step 2 is treated with acid to obtain the Fe-N-C oxygen reduction catalyst. According to the Fe-N-C compound synthesized through the method, the microstructure is a novel multi-layer-steamed-bread-similar structure formed in the mode that a large quality of nanotubes are wound into laminates, and then the laminates are mutually stacked; in addition, due to the fact that Fe metal particles with active centers are wrapped in the nanotubes, the obtained Fe-N-C oxygen reduction catalyst has the good stability and activity.

Description

technical field [0001] The invention relates to a method for simply synthesizing a novel lamellar cake-like, high-efficiency Fe-N-C-based cathode oxygen reduction catalyst that is stable in acid. Background technique [0002] A fuel cell is a device that efficiently converts the chemical energy of fuel into electrical energy. Compared with the traditional power generation process that burns fossil fuels, dye cells can not only use renewable fuels as energy sources but also have the characteristics of environmental friendliness. The low-efficiency cathodic oxygen reduction reaction (ORR) in fuel cells is the bottleneck that limits their efficient energy conversion. So far, Pt and its catalysts are still the most effective oxygen reduction catalysts, but due to the high price of Pt, poor stability, and easy to be poisoned by fuel, etc., it largely hinders the widespread use of fuel cells. [0003] In order to reduce the production cost of fuel cells and improve battery stabi...

Claims

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Application Information

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IPC IPC(8): B01J27/24H01M4/90
CPCB01J27/24H01M4/90Y02E60/50
Inventor 王勇鲍晓冰巩玉同
Owner ZHEJIANG UNIV
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