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A kind of preparation method of bifunctional molybdenum doped cobalt sulfide/nitrogen carbon array electrode

An array electrode, cobalt sulfide technology, applied in battery electrodes, fuel cell-type half-cells and primary battery-type half-cells, circuits, etc., can solve problems such as high cost and commercial application limitations of earth reserves

Active Publication Date: 2022-07-15
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, their commercial applications are severely limited due to their high cost and scarcity of earth reserves

Method used

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  • A kind of preparation method of bifunctional molybdenum doped cobalt sulfide/nitrogen carbon array electrode
  • A kind of preparation method of bifunctional molybdenum doped cobalt sulfide/nitrogen carbon array electrode
  • A kind of preparation method of bifunctional molybdenum doped cobalt sulfide/nitrogen carbon array electrode

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Experimental program
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Effect test

Embodiment 1

[0025] the CoCl 2 ∙6H 2 O and urea were dissolved in 40 mL of deionized water at room temperature with CoCl 2 The concentration of carbon dioxide was 0.15 M, and the mass fraction of urea was 6.25 wt.%. After immersing the hydrophilic carbon paper in the solution, the reaction was kept at 90 °C for 2 h. After cooling to room temperature naturally, the carbon paper was taken out and rinsed with deionized water. Three times, dry and set aside. Soak the carbon paper on which the basic cobalt salt array was grown above in 50 mL of Tris base with a concentration of 0.01 M and pH 8.5, add 0.01 g of dopamine, stir at room temperature for 24 h, rinse the sample three times with deionized water, and then dry it. . Dissolve molybdenum chloride in ethanol solution, stir to dissolve, and obtain 400 mM molybdenum chloride ethanol solution. The carbon paper on which the basic cobalt salt array@PDA array was grown was soaked in the molybdenum chloride solution for about 1 min at room tem...

Embodiment 2

[0028] the CoCl 2 ∙6H 2 O and urea were dissolved in 40 mL of deionized water at room temperature with CoCl 2 The concentration of carbon dioxide was 0.15 M, and the mass fraction of urea was 6.25 wt.%. After immersing the hydrophilic carbon paper in the solution, the reaction was kept at 90 °C for 2 h. After cooling to room temperature naturally, the carbon paper was taken out and rinsed with deionized water. Three times, dry and set aside. The carbon paper on which the basic cobalt salt array was grown was immersed in 50 mL of Tris base with a concentration of 0.01 M and pH 8.5, 0.02 g of dopamine was added, stirred at room temperature for 24 h, and the sample was rinsed three times with deionized water. dry. Dissolve molybdenum chloride in ethanol solution, stir to dissolve, and obtain 400 mM molybdenum chloride ethanol solution. The carbon paper on which the basic cobalt salt array@PDA array was grown was soaked in the molybdenum chloride solution for about 1 min at ro...

Embodiment 3

[0032] the CoCl 2 ∙6H 2 O and urea were dissolved in 40 mL of deionized water at room temperature with CoCl 2 The concentration of carbon dioxide was 0.15 M, and the mass fraction of urea was 6.25 wt.%. After immersing the hydrophilic carbon paper in the solution, the reaction was kept at 90 °C for 2 h. After cooling to room temperature naturally, the carbon paper was taken out and rinsed with deionized water. Three times, dry and set aside. The carbon paper on which the basic cobalt salt array was grown was placed in the air to react at 400° C. for 0.5 h to obtain a carbon paper substrate on which the cobalt oxide array was grown, which was naturally cooled and taken out for use. The carbon paper on which the cobalt oxide arrays were grown was soaked in 50 mL of Tris base with a concentration of 0.01 M and pH 8.5, 0.02 g of dopamine was added, and the samples were stirred at room temperature for 24 h. The samples were rinsed three times with deionized water and then dried. ...

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Abstract

The invention provides a preparation method of a bifunctional molybdenum-doped cobalt sulfide / nitrogen-carbon array electrode. The cobalt-based precursor array structure is obtained by chemical bath deposition-assisted drying or pre-oxidation or pre-sulfidation, and then a layer of polydopamine is grown on the surface of the cobalt-based precursor to adsorb molybdenum ions, and finally the reaction is annealed in a sulfur atmosphere. During the annealing process, polydopamine is gradually transformed into nitrogen-doped carbon material, and the cobalt-based precursor reacts with sulfur vapor to form cobalt sulfide. At the same time, molybdenum ions are dispersed due to the coordination and adsorption of nitrogen in polydopamine, and are located on the surface of polydopamine and isolated from cobalt elements. Then a molybdenum-doped cobalt sulfide / nitrogen carbon structure is formed. The Co-N-C bond structure formed by the cobalt sulfide / nitrogen-carbon interface in the technical solution of the present invention has good ORR and OER performance; The Mo-N are also highly active centers for OER and ORR, respectively.

Description

technical field [0001] The invention relates to a doped and composite in-situ electrode and its preparation, and belongs to the field of energy storage and conversion materials and devices. Background technique [0002] Reversible metal-air batteries and fuel cells have attracted extensive attention in the field of new energy as a new class of energy storage devices. Among them, electrocatalytic oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are the two core reactions in reversible metal-air batteries. Therefore, the development of OER / ORR bifunctional electrocatalysts with high catalytic activity, high stability and low cost will greatly promote the application of metal-air batteries. So far, these cheap and efficient OER and ORR catalysts are all based on noble metal materials, such as: Pt has good ORR performance, Ru, Ir and their oxides have good OER performance. However, their commercial application is greatly limited due to their high cost and sc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/90H01M12/06
CPCH01M4/8652H01M4/8885H01M4/9008H01M12/06
Inventor 黄妞骆禅闫术芳杨柳
Owner CHINA THREE GORGES UNIV
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