A kind of vanadium-doped carbon-coated iron carbide multifunctional composite electrocatalyst, preparation method and application thereof

An electrocatalyst and carbon coating technology, applied in the field of electrochemical catalysis, can solve the problems of limited application and limited electrocatalytic performance, and achieve the effects of high performance, optimized electronic conductivity and low cost

Active Publication Date: 2022-08-02
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] But currently, Fe 3 The limited electrocatalytic performance of C limits its further application

Method used

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  • A kind of vanadium-doped carbon-coated iron carbide multifunctional composite electrocatalyst, preparation method and application thereof
  • A kind of vanadium-doped carbon-coated iron carbide multifunctional composite electrocatalyst, preparation method and application thereof
  • A kind of vanadium-doped carbon-coated iron carbide multifunctional composite electrocatalyst, preparation method and application thereof

Examples

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preparation example Construction

[0028] The present invention is a method for preparing a vanadium-doped carbon-coated iron carbide multifunctional composite electrocatalyst, comprising the following steps:

[0029] (1) Weigh sodium orthovanadate (Na 3 VO 4 ), ferric chloride hexahydrate (FeCl 3 ·6H 2 O), dicyandiamide (C 2 H 4 N 4 ) and NaCl as a template (NaCl does not participate, protects, promotes V doping), and controls Na 3 VO 4 : FeCl 3 ·6H 2 O:C 2 H 4 N 4 : The mass ratio of NaCl is (0.01~0.06): (0.2~0.7): (2~4.5): (1~3.5), transfer the above substances to a beaker, add ethanol and stir well in a magnetic stirrer for 20~45 min , and then dried in a vacuum dryer at 60~80°C for 12~16 h to obtain the mixed raw materials. By mixing fully in this way, the reaction is uniform and the reaction is sufficient;

[0030] (2) Put the material obtained in step (1) into the porcelain boat, and place it in the heating position of the tube furnace, then vacuumize the tube furnace and pass argon as a pro...

Embodiment 1

[0034] The present invention is a method for preparing a vanadium-doped carbon-coated iron carbide multifunctional composite electrocatalyst, comprising the following steps:

[0035] (1) Weigh sodium orthovanadate (Na 3 VO 4 ), ferric chloride hexahydrate (FeCl 3 ·6H 2 O), dicyandiamide (C 2 H 4 N 4 ) and sodium chloride (NaCl), and control Na 3 VO 4 : FeCl 3 ·6H 2 O:C 2 H 4 N 4 : The mass ratio of NaCl is 0.06:0.7:4.5:1, transfer the above substances to a beaker, add ethanol, stir well in a magnetic stirrer for 45 min, and then put them in a vacuum dryer for 60o C was dried for 12 h to obtain mixed raw materials;

[0036] (2) Put the material obtained in step (1) into the porcelain boat, and place it in the heating position of the tube furnace, then evacuating the tube furnace and feeding it with argon as a protective atmosphere, and the gas flow rate is 40 sccm / min .

[0037] (3) Set the heating rate of the tube furnace to 4 o C / min and raise the temperature t...

Embodiment 2

[0040] The present invention is a method for preparing a vanadium-doped carbon-coated iron carbide multifunctional composite electrocatalyst, comprising the following steps:

[0041] (1) Weigh sodium orthovanadate (Na 3 VO 4 ), ferric chloride hexahydrate (FeCl 3 ·6H 2 O), dicyandiamide (C 2 H 4 N 4 ) and sodium chloride (NaCl), and control Na 3 VO 4 : FeCl 3 ·6H 2 O:C 2 H 4 N 4 : The mass ratio of NaCl is 0.05:0.6:4:1.5, transfer the above substances to a beaker, add ethanol, stir well in a magnetic stirrer for 40 min, and then put them in a vacuum dryer for 60 minutes. o C was dried for 12 h to obtain mixed raw materials;

[0042] (2) Put the material obtained in step (1) into the porcelain boat, and place it in the heating position of the tube furnace, then evacuate the tube furnace and pass argon gas as a protective atmosphere, and the gas flow rate is 50 sccm / min .

[0043] (3) Set the heating rate of the tube furnace to 6 o C / min, and raise the temperatur...

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Abstract

The invention provides a vanadium-doped carbon-coated iron carbide multifunctional composite electrocatalyst, a preparation method and application thereof, and belongs to the technical field of electrochemical catalysis. The preparation method comprises the following steps: mixing sodium orthovanadate, hexahydrate trichloride Ferric, dicyandiamide and sodium chloride are mixed uniformly and then heat-insulated at 700~950℃ under a protective atmosphere. The mass ratio of sodium orthovanadate, ferric chloride hexahydrate and dicyandiamide is (0.01~0.06) : (0.2~0.7): (2~4.5) to obtain a mixture; the mixture is cooled in a protective atmosphere, washed and dried in sequence to obtain a vanadium-doped carbon-coated iron carbide multifunctional composite electrocatalyst. The process of the invention is simple, the production cost is low, and the conditions are easy to control, and the electrocatalyst prepared by the method can be used for HER, OER and ORR, and exhibits excellent catalytic activity.

Description

technical field [0001] The invention belongs to the technical field of electrochemical catalysis, in particular to a vanadium-doped carbon-coated iron carbide multifunctional composite electrocatalyst and a preparation method and application thereof. Background technique [0002] The current energy mainly relies on fossil energy such as oil, natural gas and coal, but due to the excessive exploitation and use of human beings, which has caused environmental pollution and energy crisis, there is an urgent need to develop green and sustainable new energy sources to replace them. Hydropower, wind power, and solar hydrogen energy are all good green and clean energy sources, among which water electrolysis to produce hydrogen, fuel cells and metal-air batteries are good sustainable energy technologies. These energy conversion systems can achieve the 2 O, O 2 and H 2 A zero-pollution system for recycling. [0003] Hydrogen evolution reaction (HER), oxygen evolution reaction (OER)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90C25B11/091C25B1/04
CPCH01M4/8825H01M4/90H01M4/9083C25B1/04Y02E60/50
Inventor 黄剑锋张晓冯亮亮曹丽云刘倩倩李帅楠李晓艺
Owner SHAANXI UNIV OF SCI & TECH
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