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Cobalt-iron bimetallic nitride composite electrocatalyst and preparation method and application thereof

An electrocatalyst and bimetallic technology, applied in the field of electrocatalysis, can solve the problems of complicated and time-consuming heating process, achieve the effect of increasing the specific surface area, good application prospects, and reducing the internal resistance of the electrode

Active Publication Date: 2020-02-04
JIANGSU SOPO GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, both methods suffer from technical problems, including the complex, time-consuming heating process and, in some cases, the indispensable use of toxic organic solvents (such as methanol or dimethylformamide)

Method used

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  • Cobalt-iron bimetallic nitride composite electrocatalyst and preparation method and application thereof
  • Cobalt-iron bimetallic nitride composite electrocatalyst and preparation method and application thereof
  • Cobalt-iron bimetallic nitride composite electrocatalyst and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1, a kind of carbon cloth (CC) is the preparation of the cobalt-iron double metal nitride composite electrocatalyst (FeN / CoN / CC) of substrate, concrete steps are:

[0030] (1) The cut CC (2cm×5cm; thickness: 360μm; density: 120g / m 2 ) first use 16mol / L

[0031] Concentrated nitric acid was refluxed at 120°C for 12h, then ultrasonically cleaned with deionized water, acetone and ethanol in sequence, and then vacuum-dried (60°C, 12h) to obtain clean CC.

[0032] (2) Weigh 1.3136g of 2-methylimidazole, add 40mL of deionized water and stir until a clear solution is obtained to obtain 2-methylimidazole aqueous solution A; then weigh 0.5821g of cobalt nitrate, add 40mL of deionized water and stir until completely Dissolve to obtain the cobalt nitrate aqueous solution B, quickly add the B solution to the A solution, stir until the mixture is uniform, and obtain the mixed solution C. Add cleaned carbon cloth to the mixed solution C, and precipitate at room temperatu...

Embodiment 2

[0034] Embodiment 2, a kind of carbon cloth (CC) is the preparation of the cobalt-iron double metal nitride composite electrocatalyst (FeN / CoN / CC) of substrate, concrete steps are:

[0035] (1) The cut CC (2cm×5cm; thickness: 360μm; density: 120g / m 2) first refluxed with 16mol / L concentrated nitric acid at 120°C for 12h, then ultrasonically cleaned with deionized water, acetone and ethanol in sequence, and vacuum dried (60°C, 12h) to obtain clean CC.

[0036] (2) Weigh 1.3136g of 2-methylimidazole, add 40mL of deionized water and stir until a clear solution is obtained to obtain 2-methylimidazole aqueous solution A; then weigh 0.5821g of cobalt nitrate, add 40mL of deionized water and stir until completely Dissolve to obtain the cobalt nitrate aqueous solution B, quickly add the B solution to the A solution, stir until the mixture is uniform, and obtain the mixed solution C. Add cleaned carbon cloth to the mixed solution C, and precipitate at room temperature for 2 hours. Aft...

Embodiment 3

[0038] Embodiment 3, a kind of carbon cloth (CC) is the preparation of the cobalt-iron bimetallic nitride composite electrocatalyst (FeN / CoN / CC) of substrate, concrete steps are:

[0039] (1) The cut CC (2cm×5cm; thickness: 360μm; density: 120g / m 2 ) first refluxed with 16mol / L concentrated nitric acid at 120°C for 12h, then ultrasonically cleaned with deionized water, acetone and ethanol in sequence, and vacuum dried (60°C, 12h) to obtain clean CC.

[0040] (2) Weigh 1.3136g of 2-methylimidazole, add 40mL of deionized water and stir until a clear solution is obtained to obtain 2-methylimidazole aqueous solution A; then weigh 0.5821g of cobalt nitrate, add 40mL of deionized water and stir until completely Dissolve to obtain the cobalt nitrate aqueous solution B, quickly add the B solution to the A solution, stir until the mixture is uniform, and obtain the mixed solution C. Add cleaned carbon cloth to the mixed solution C, and precipitate at room temperature for 2 hours. Afte...

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Abstract

The invention discloses a cobalt-iron bimetallic nitride composite electrocatalyst and a preparation method thereof. The electrocatalyst comprises the components by the mass percentage: 20-52% of ironnitride, 44-26% of cobalt nitride and the balance being carbon cloth. The preparation method comprises the steps: refluxing carbon cloth with concentrated nitric acid, cleaning and drying; preparinga cobalt nitrate aqueous solution, adding the cobalt nitrate aqueous solution into a prepared 2-methylimidazole aqueous solution, uniformly stirring and mixing, adding the treated carbon cloth into the obtained mixed solution, carrying out a reaction at room temperature, cleaning and drying to obtain a ZIF-67 / carbon cloth composite material; adding the ZIF-67 / carbon cloth composite material into aprepared potassium ferrocyanide aqueous solution, carrying out a reaction at room temperature, cleaning and drying, calcining, and cooling to room temperature to obtain the iron nitride / cobalt nitride / carbon cloth composite material. The prepared electrocatalyst can greatly reduce overpotential and Tafel slope, has good electrical conductivity, and can greatly improve the water decomposition andcatalytic oxygen production efficiency of the composite electrocatalyst.

Description

technical field [0001] The invention belongs to the field of electrocatalysis, and relates to a cobalt-iron bimetallic nitride composite electrocatalyst, a preparation method and application thereof. Background technique [0002] At present, the energy crisis and environmental pollution have seriously threatened the survival and development of human beings. With the depletion of fossil fuels, the search for clean and sustainable energy has become a top priority. Hydrogen energy has attracted widespread attention due to its cleanness, pollution-free and high combustion value. In the development and utilization of hydrogen energy, hydrogen production by electrochemical decomposition has become one of the ideal hydrogen production methods because it does not directly consume fossil energy and the process operation is simple. The electrolysis of water mainly includes two reactions, the cathode electrochemically catalyzed hydrogen evolution reaction (HER) and the anode electroc...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J21/18B01J35/10B01J37/06B01J37/34B01J37/08C25B1/04C25B11/06
CPCB01J27/24B01J21/18B01J37/06B01J37/343B01J37/086C25B1/04C25B11/051C25B11/091B01J35/33B01J35/613B01J35/615Y02E60/36
Inventor 朱桂生姜德立邵守言谢吉民许宝华陈钢权彪黄春霞
Owner JIANGSU SOPO GRP
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