Bismuth-based self-supporting electrocatalyst, preparation method thereof and application of bismuth-based self-supporting electrocatalyst in nitrogen reduction ammonia production

An electrocatalyst and self-supporting technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high energy consumption, harsh conditions, and large pollution, and achieve large specific surface area and layer The effect of high spacing and efficient recycling

Pending Publication Date: 2020-07-03
LIAONING UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The demand for ammonia in today's society is increasing day by day, but the production of ammonia in the industry at this stage is mainly through the traditional Haber-Bosch method, which has harsh conditions (high temperature and pressure), high pollution (a large amount of carbon dioxide emissions), and high energy consumption (production process The energy consumed in the world accounts for about 1% of the world's annual energy consumption)

Method used

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  • Bismuth-based self-supporting electrocatalyst, preparation method thereof and application of bismuth-based self-supporting electrocatalyst in nitrogen reduction ammonia production
  • Bismuth-based self-supporting electrocatalyst, preparation method thereof and application of bismuth-based self-supporting electrocatalyst in nitrogen reduction ammonia production
  • Bismuth-based self-supporting electrocatalyst, preparation method thereof and application of bismuth-based self-supporting electrocatalyst in nitrogen reduction ammonia production

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Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1 bismuth-based self-supporting electrocatalyst (Bi 2 o 3 @FEG)

[0022] (1) The preparation method is as follows:

[0023] 1) Preparation of FEG: carbon paper was used as working electrode, calomel electrode was used as reference electrode, and another piece of carbon paper was used as counter electrode. First, the carbon paper was charged at 20mV s by CV at a voltage range of 0.6 to 1.8V -1 Sweep 8 circles at the scanning speed, with 25mL0.5molL -1 K 2 CO 3 The solution was used as electrolyte, soaked in deionized water for 12h. Then, the carbon paper was scanned by i-t at a constant voltage of 1.8V for 9000s, and 25mL0.5mol L -1 KNO 3 The solution was used as electrolyte and washed several times with deionized water. Finally, the carbon paper was charged by CV at a voltage range of -1 to 0.9V at 50mV s -1 Sweep 50 circles at the scanning speed, with 25mL3 mol L -1 K 2 CO 3 The solution was used as an electrolyte, washed several times with wate...

Embodiment 2

[0031] Embodiment 2 bismuth-based self-supporting electrocatalyst (Bi 2 o 3 @FEG) Electrocatalytic Nitrogen Reduction for Ammonia Production

[0032] Experimental method: Under ambient conditions, the H-type electrolytic cell is used as the electrolytic cell, and 0.1M Na 2 SO 4 The solution is used as the electrolyte, the volume of the electrolyte is 70mL, the Ag / AgCl electrode is used as the reference electrode, the platinum sheet is used as the counter electrode, and the Bi 2 o 3 @FEG clips directly on the platinum electrode clip as the working electrode. Under nitrogen atmosphere, the electrocatalytic nitrogen reduction ammonia production experiment was carried out. After the experiment, the Bi 2 o 3 @FEG is washed several times with ultrapure water, and can be used directly after being washed several times with electrolyte solution before the next use.

[0033] The product was analyzed with an ammonia sensitive electrode. Such as Figure 4 and Figure 5 As shown, ...

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Abstract

The invention belongs to the technical field of catalysts, and particularly relates to a preparation method of a bismuth-based self-supporting electrocatalyst and an application of the bismuth-based self-supporting electrocatalyst in electrocatalytic nitrogen reduction ammonia production. Bi2O3 catalyst nanoparticles are immobilized on a carbon material substrate, treated by an electrochemical method, by the electrochemical method to obtain the bismuth-based self-supporting electrocatalyst. Electrodeposition is carried out by taking carbon material treated by the electrochemical method as a working electrode, a platinum sheet electrode as a counter electrode and a reference electrode and an ethylene glycol solution of BiCl3 as an electrolyte, and the obtained carbon material substrate immobilized with the Bi2O3 catalyst nanoparticles is taken out, cleaned and dried to obtain the bismuth-based self-supporting electrocatalyst. The bismuth-based self-supporting electrocatalytic material stable in structure, good in conductivity and large in specific surface area is obtained. The bismuth-based self-supporting electrocatalyst has the advantages of simple preparation method, good repeatability, no need of a binder, adjustable immobilization amount, ideal ammonia production efficiency and Faraday efficiency of electrocatalytic nitrogen reduction, and wide application prospect in the fields of electrocatalytic nitrogen reduction ammonia production and the like.

Description

technical field [0001] The invention belongs to the field of catalyst materials, and in particular relates to the preparation of a bismuth-based self-supporting electrocatalyst with catalytic performance for nitrogen reduction and ammonia production and its application in electrocatalytic nitrogen reduction and ammonia production. Background technique [0002] Ammonia (NH 3 ) is one of the most important chemical raw materials in the current human society, and plays a very important role in agriculture, industry, textiles and other fields. Ammonia is easy to liquefy, store and transport, has a high energy density (4.32KWh / L), and its hydrogen content is 17.6wt%. It is a very stable hydrogen energy carrier and can be dissociated to generate hydrogen. The demand for ammonia in today's society is increasing day by day, but the production of ammonia in the industry at this stage is mainly through the traditional Haber-Bosch method, which has harsh conditions (high temperature a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18B01J35/10B01J37/34C25D9/04C25B1/00C25B11/06
CPCB01J23/18B01J35/023B01J35/0033B01J35/1004B01J37/348C25D9/04C25B1/00C25B11/077
Inventor 马天翼孙颖邓子昭李慧王宇
Owner LIAONING UNIVERSITY
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