Polypyrrole electrolytic synthesis method

A technology for electrolytic synthesis and polypyrrole, which is applied in electrolytic processes, electrolytic components, electrolytic organic production, etc., can solve problems such as low catalytic activity, and achieve the effects of low preparation cost, good application and development prospects, and good electrocatalytic oxidation characteristics.

Active Publication Date: 2007-07-11
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the defect of low electrocatalytic activity of polypyrrole to small organic molecules in the prior art, the invention provides an electrolytic synthesis method of polypyrrole

Method used

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  • Polypyrrole electrolytic synthesis method
  • Polypyrrole electrolytic synthesis method
  • Polypyrrole electrolytic synthesis method

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Experimental program
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Effect test

Embodiment 1

[0022] The raw material for polymerization monomer is pyrrole, the concentration is 0.4mol / L, and pyrrole is purified by distillation before the experiment. 1-Ethylimidazole trifluoroacetate acts as both solvent and electrolyte. The platinum electrode is the working electrode. Before the experiment, the platinum electrode needs to be burned to remove the impurities adsorbed on the surface, and then ultrasonically cleaned with acetone and double distilled water in turn; the large-area platinum sheet is both a reference electrode and an auxiliary electrode. Polypyrrole was prepared by cyclic voltammetry, the scanning speed was 50mV / s, and the scanning potential range was 0-1.2V. The prepared polypyrrole was rinsed with distilled water, and dried in a vacuum oven at 40° C. to obtain a dark brown polypyrrole conductive polymer.

[0023] Referring to FIG. 1 , it is found through scanning electron microscopy that the structure of polypyrrole is very flat and regular, consisting of ...

Embodiment 2

[0026] The monomer raw material for polymerization is pyrrole, the concentration is 0.3mol / L, and pyrrole is purified by distillation before the experiment. 1-Ethylimidazole trifluoroacetate acts as both solvent and electrolyte. The platinum electrode is the working electrode. Before the experiment, the platinum electrode needs to be burned to remove the impurities adsorbed on the surface, and then ultrasonically cleaned with acetone and double distilled water in turn; the large-area platinum sheet is both a reference electrode and an auxiliary electrode. Polypyrrole was prepared by constant current method, and the polymerization current density was 0.5mA / cm 2 . The prepared polypyrrole was rinsed with distilled water, and dried in a vacuum oven at 50° C. to obtain a dark brown polypyrrole conductive polymer.

[0027] Figure 3 illustrates that the polypyrrole electrode synthesized under the conditions of this example has better electrocatalytic activity to ethanol. When sca...

Embodiment 3

[0029] The raw material for polymerization monomer is pyrrole, the concentration is 0.4mol / L, and pyrrole is purified by distillation before the experiment. 1-Ethylimidazole trifluoroacetate acts as both solvent and electrolyte. The platinum electrode was used as the working electrode. Before the experiment, the platinum electrode was burned to remove the impurities adsorbed on the surface, and then ultrasonically cleaned with acetone and double-distilled water in sequence; the saturated calomel electrode was used as the reference electrode, and the large-area platinum sheet was used as the auxiliary electrode. Polypyrrole was prepared by constant potential electrolysis, and the polymerization potential was 1.0V. The prepared polypyrrole was rinsed with distilled water, and dried in a vacuum oven at 40° C. to obtain a dark brown polypyrrole conductive polymer.

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Abstract

The invention discloses an electrolyzing synthesizing method of polypyrrole, which comprises the following steps: dissolving pyrrole monomer in the Bronsted acid typed ionic liquid; placing in the electrolyser with working electrode, auxiliary electrode and reference electrode; selecting working electrode from stainless steel electrode or platinum electrode or nickel electrode or glass-carbon electrode; selecting the auxiliary electrode from platinum electrode or graphite electrode with large area; selecting reference electrode from Ag/AgCl electrode or saturated calomel electrode or large area of platinum electrode or standard hydrogen electrode.

Description

(1) Technical field [0001] The invention relates to an electrolytic synthesis method of polypyrrole. (2) Background technology [0002] Polypyrrole has the advantages of good electrical conductivity, low price, and convenient preparation. Since it was first invented 30 years ago, its research and application have become more and more extensive. Polypyrrole has many excellent properties, among which electrocatalytic performance is one of the important properties. Domestic and foreign literatures show that polypyrrole has good electrocatalytic activity for vitamin C and so on. However, polypyrrole synthesized in aqueous solution has almost no electrocatalytic activity for small organic molecules such as methanol and ethanol. Moreover, synthesizing polypyrrole in aqueous solution is vulnerable to the attack of -OH free radicals in water and degrades, resulting in low stability. [0003] Improving the electrocatalytic oxidation of methanol, ethanol, formic acid and other small...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/00C08G73/06
Inventor 李美超马淳安
Owner ZHEJIANG UNIV OF TECH
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