Method for preparing ferrate through electrolysis of non-noble metal catalyzed gas diffusion electrode

A gas diffusion electrode, non-precious metal technology, applied in the field of electrochemistry, can solve the problems of the non-precious metal catalyzed gas diffusion electrode's poor catalytic performance and few commercial applications, and achieve excellent oxygen reduction activity, cost reduction, and cell voltage reduction. Effect

Pending Publication Date: 2020-11-06
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

Gas diffusion electrodes catalyzed by non-noble metals are not as catalytic as noble metal catalysts, so there are few commercial applications

Method used

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  • Method for preparing ferrate through electrolysis of non-noble metal catalyzed gas diffusion electrode
  • Method for preparing ferrate through electrolysis of non-noble metal catalyzed gas diffusion electrode
  • Method for preparing ferrate through electrolysis of non-noble metal catalyzed gas diffusion electrode

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Effect test

Embodiment

[0045] 1. Preparation of Fe-N-C catalyst

[0046] 1. Add 1 g of dicyandiamide to 20 ml of deionized water and stir at 80°C until completely dissolved;

[0047] 2. Add 0.1 g anhydrous FeCl 3 , stirred until dissolved;

[0048] 3. Add 0.1 g of carbon black, stir for 4 h, dry and grind to make a precursor;

[0049] 4. The precursor was calcined at 550°C for 3h in an argon atmosphere, then heated at 750°C for 1h, cooled to room temperature with the furnace, and ground to obtain the Fe-N-C catalyst.

[0050] The scanning electron micrographs of the prepared Fe-N-C catalyst are as follows: figure 1 As shown, the catalysts are uniform nanoparticles. Using Shanghai Chenhua CH660 electrochemical workstation, in the KOH solution with an oxygen saturation concentration of 0.1 mol / L, the linear sweep voltammetry curve of the Fe-N-C catalyst was tested, and the commercial Pt containing 20 wt% Pt was tested under the same conditions / C catalyst linear sweep voltammetry curve, such as ...

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Abstract

The invention relates to a method for preparing ferrate through electrolysis of a non-noble metal catalytic gas diffusion electrode. A Fe-N-C catalyst is prepared by a simple and cheap pyrolysis method, the catalyst has excellent oxygen reduction activity, the non-noble metal catalytic gas diffusion electrode is prepared from the Fe-N-C catalyst, the gas diffusion electrode does not contain noblemetal, and the cost is obviously reduced. The ferrate is prepared by taking the gas diffusion electrode as a cathode, iron as an anode and a concentrated alkaline solution as an electrolyte through electrolysis. When the method is used for producing ferrate through electrolysis, the cell voltage is reduced to 39.56%-54.12% of the cell voltage of an electrolysis method without adopting a gas diffusion electrode, the unit consumption of electric energy is reduced to 31.96%-56.67%, and a remarkable energy-saving effect is achieved.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a method for electrolytically preparing ferrate with a gas diffusion electrode catalyzed by a non-noble metal. Background technique [0002] Ferrate is a hexavalent compound of iron. Ferrate has strong oxidizing properties and can effectively kill bacteria, viruses and harmful substances in oxidized water. Its reduction product Fe(OH) 3 It is also an environmentally friendly flocculant. Therefore, ferrate has attracted people's attention as a novel and environmentally friendly oxidant. [0003] The preparation methods for ferrate mainly include dry method, wet method and electrolytic method. Among them, the dry method is also called the melting method, which is to melt the alkali metal peroxide and iron or iron salt at high temperature to make them react to form potassium ferrate. The process is simple and can be produced in batches, but the reaction is easy to caus...

Claims

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Application Information

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IPC IPC(8): C25B1/00C25B11/06B01J27/24B01J37/08
CPCC25B1/00B01J27/24B01J37/082B01J35/33
Inventor 李志林张睿王峰刘景军吉静张正平窦美玲牛津
Owner BEIJING UNIV OF CHEM TECH
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