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Doped polyaniline directly-carbonized composite electrocatalyst, preparation method and application

An electrocatalyst, polyaniline technology, applied in physical/chemical process catalysts, chemical instruments and methods, circuits, etc.

Inactive Publication Date: 2013-04-03
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to reduce the cost of the catalyst, there are currently two main solutions: one is to reduce the amount of Pt used, such as using alloys or composites of platinum and other metals to replace pure platinum, and to disperse Pt nanoparticles through the use of carbon supports. However, Pt is expensive and its reserves are small, and its use is still one of the main factors leading to the high cost of batteries; the other is to explore non-noble metal catalysts, or metal-less, non-metallic carbon-nitrogen compounds as catalysts

Method used

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  • Doped polyaniline directly-carbonized composite electrocatalyst, preparation method and application
  • Doped polyaniline directly-carbonized composite electrocatalyst, preparation method and application
  • Doped polyaniline directly-carbonized composite electrocatalyst, preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0030]Dissolve 368μL of aniline in 20mL of 1mol / L HCl solution to form a hydrochloric acid solution of aniline, denoted as A; dissolve 1.14g of ammonium persulfate in 20mL of 1mol / L HCl solution, and denote the formed solution as B; then the above Solutions A and B were quickly mixed, and after fully stirring, they were allowed to stand at 20°C for 24 hours to form a paste; add 40mL of acetone to the above paste, stir and filter, and the resulting solid was placed at room temperature for 2 hours. Afterwards, the catalyst precursor was obtained by vacuum drying; the dried catalyst precursor was put into a tube furnace, and N2 was passed through for half an hour to fill the tube furnace with N2, and then the temperature was raised from room temperature to 350°C for 2 hours at a constant temperature. Then the temperature was raised to 700° C. for 2 hours at a constant temperature, and the heating rate was 2° C. / min. Stop passing N2 until it drops to room temperature to obtain the...

Embodiment 2

[0033] The preparation process of the composite electrocatalyst for direct carbonization of polyaniline is the same as that of Example 1. The test was carried out in 1 mol / L NaOH aqueous solution saturated with oxygen. The scanning speed is 5 mV / s, and the corresponding linear scanning curve is shown in figure 1 . The onset potential of the oxygen reduction reaction was -0.131 V (vs SCE), and the current density was 2.91mA cm-2-0.5 V (vs SCE) 2000rpm.

Embodiment 3

[0035] Dissolve 368μL of aniline in 20mL of 1mol / L HCl solution to form aniline hydrochloric acid solution, denoted as A; dissolve 1.2mg of FeCl36H2O solid in 20mL of 1mol / L HCl solution, and then add 1.14g of ammonium persulfate to form a solution denoted as It is B; then quickly mix the above solutions A and B, after stirring thoroughly, let stand at 20°C for 24 hours to form a paste; add 80mL of acetone to the above paste, stir and filter to obtain a solid Place it at room temperature for 2 hours, then vacuum dry to obtain the precursor of the catalyst; put the catalyst precursor obtained by drying into a tube furnace, and pass through N for half an hour first. 2 Fill the tube furnace with N 2 , and then the temperature was raised from room temperature to 350° C. for 2 hours, and then raised to 700° C. for 2 hours. The heating rate was 2° C. / min. Stop passing N until it drops to room temperature 2 That is, the direct carbonization product of iron-doped polyaniline is o...

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Abstract

The invention discloses a preparation method of a doped polyaniline directly-carbonized composite electrocatalyst. The preparation method comprises the following steps: (1) in the process of polymerizing phenylamine to form the polyaniline, doping metal iron or cobalt salt, and subsequently carrying out carbonization treatment at a certain temperature so as to obtain a doped polyaniline carbonized product; (2) treating the doped doped polyaniline carbonized product by using sulfuric acid, and continuously carrying out the secondary thermal treatment at the high temperature so as to obtain a transit metal doped C-N compound electrocatalyst; and (3) adding the compound electrocatalyst into absolute ethyl alcohol and a Nafion solution, carrying out ultrasonic dispersion, and forming into paste and adhering to the surface of a glassy carbon electrode so as to prepare a corresponding transit metal doped C-N compound electrocatalyst electrode. The electrocatalytic activity of the doped polyaniline carbonized compound to the oxygen reduction reaction is tested respectively in acid and alkali solutions. The C-N transit metal doped compound electrocatalyst has strong electrocatalytic activity to the oxygen reduction reaction, is simple in preparation method, wide in material resource and low in cost, and is widely used in fuel cells.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to the production method of polyaniline carbonization products, iron-doped polyaniline carbonization products, cobalt-doped polyaniline carbonization products and iron-cobalt doped polyaniline carbonization products, and relates to the oxygen reduction reaction of these carbonization products electrocatalytic activity test. Background technique [0002] Fuel cells have the advantages of high operating efficiency and low emissions, and are recognized as clean energy conversion systems. However, the high cost of fuel cells restricts its commercialization process and is one of the most important key issues in this field of research. The cathode reaction of the fuel cell is an oxygen reduction process, and the reduction reactions of oxygen in acidic and alkaline solutions are: [0003] Acidity: O 2 + 4H+ +4e - 2H 2 o [0004] Alkaline: O 2 + 2H 2 O + 4e——4OH- [0005] Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24H01M4/90
CPCY02E60/50
Inventor 易清风张玉晖楚浩孙丽枝
Owner HUNAN UNIV OF SCI & TECH
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