Preparation method of cobalt sulfide and nitrogen-doped carbon composite array electrode

A nitrogen-doped carbon, composite array technology, applied in chemical instruments and methods, electrodes, electrolysis processes, etc., can solve the problems of high cost, limited comprehensive use of electrocatalysts, lack of resources, etc., and achieve the effect of good catalytic performance.

Active Publication Date: 2019-05-24
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, their comprehensive use as commercial electrocatalysts is limited due to their high cost and scarcity of resources.

Method used

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  • Preparation method of cobalt sulfide and nitrogen-doped carbon composite array electrode
  • Preparation method of cobalt sulfide and nitrogen-doped carbon composite array electrode
  • Preparation method of cobalt sulfide and nitrogen-doped carbon composite array electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] At room temperature, 0.15 M CoCl 2 ∙ 6H 2 O, urea with a mass fraction of 6.25% was dissolved in 40 mL of deionized water. The carbon paper was soaked in the solution, reacted in a water bath at 90 °C for 2 h, cooled naturally to room temperature, the carbon paper was taken out, rinsed with deionized water three times, and dried for later use. CFP / Co 3 o 4 , and then the CFP / Co 3 o 4 CFP / CoS 2 . CFP / CoS 2 Soak in 50 mL of Tris base with a concentration of 0.01 M and a pH of 8.5, add 25 mg of dopamine, stir at room temperature for 24 h, rinse the sample three times with deionized water and dry to obtain CFP / CoS 2 @PDA. CFP / CoS 2 @PDA was placed in a tube furnace, reacted at 350 °C for 2 h under Ar flow, then continued to heat up to 700 °C for 2 h, cooled naturally to room temperature, and then took it out to obtain CFP / Co 9 S 8 -Co 4 S 3 @C in situ electrodes.

[0028] figure 1 The OER and ORR linear voltammetry sweep (LSV) diagrams of the electrode prep...

Embodiment 2

[0030] At room temperature, 0.15 M CoCl 2 ∙ 6H 2 O, urea with a mass fraction of 6.25% was dissolved in 40 mL of deionized water. The carbon paper was soaked in the solution and reacted in a water bath at 90 °C for 2 h, cooled naturally to room temperature, the carbon paper was taken out, rinsed with deionized water three times, and dried for later use. CFP / Co 3 o 4 , and then the CFP / Co 3 o 4 CFP / CoS was obtained by reacting at 500°C for 60 min under the airflow of sulfur powder (0.5g) 2 . CFP / CoS 2 Soak in 50 mL of Tris base with a concentration of 0.01 M and a pH of 8.5, add 40 mg of dopamine, stir at room temperature for 24 h, rinse the sample three times with deionized water and dry to obtain CFP / CoS2 @PDA. CFP / CoS 2 @PDA was placed in a tube furnace, reacted at 350 °C for 2 h under Ar flow, then continued to heat up to 700 °C for 2 h, cooled naturally to room temperature, and then took it out to obtain CFP / Co 9 S 8 -Co 4 S 3 @C in situ electrodes.

[0031]...

Embodiment 3

[0034] At room temperature, 0.15 M CoCl 2 ∙ 6H 2 O, urea with a mass fraction of 6.25% was dissolved in 40 mL of deionized water. The carbon paper was soaked in the solution and reacted in a water bath at 90 °C for 2 h, cooled naturally to room temperature, the carbon paper was taken out, rinsed with deionized water three times, and dried for later use. CFP / Co 3 o 4 , and then the CFP / Co 3 o 4 React at 500°C for 60 min under the airflow of sulfur powder (0.5 g) to obtain CFP / CoS 2 . CFP / CoS 2 Soak in 50 mL of Tris base with a concentration of 0.01 M and a pH of 8.5, add 60 mg of dopamine, stir at room temperature for 24 h, rinse the sample three times with deionized water and dry to obtain CFP / CoS 2 @PDA. CFP / CoS 2 @PDA was placed in a tube furnace, reacted at 350 °C for 2 h under Ar flow, then continued to heat up to 700 °C for 2 h, cooled naturally to room temperature, and took it out to obtain CFP / Co 9 S 8 -Co 4 S 3 @C In situ electrodes.

[0035] image 3 ...

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Abstract

The invention provides a preparation method of a dual-function cobalt sulfide and nitrogen-doped carbon composite array electrode. A chemical bath deposition method is adopted for preparing an alkalitype cobalt needle-shaped array in-situ electrode, after annealing is performed in air, a Co3O4 array is formed, and Co3O4 is annealed under the atmosphere of sulfur gas to form a CoS2 array. Then, dopamine is used for growing poly-dopamine on the surface of the Co3O4 or CoS2 array, then, an annealing reaction is performed under the protective atmosphere, poly-dopamine is converted into a nitrogen-doped carbon material in the reaction process, Co3O4 or CoS2 is converted into Co9S8-Co4S3 under the atmosphere of sulfur or inert gas. According to the product obtained through the technical scheme,due to the fact that the product has various high-electro-catalysis active loci including nitrogen-doped active loci in the carbon material and other lattice defects caused by the loci, and the excellent electro-catalysis oxygen reduction reaction (ORR) performance is achieved; the Co9S8-Co4S3 has the good electro-catalysis oxygen evolution reaction (OER) performance; in addition, the interface formed by Co9S8-Co4S3, the carbon material and the strong interface coupling effect has the excellent electro-catalysis OER and OER performance.

Description

technical field [0001] The invention relates to an in-situ electrode and its preparation, and belongs to the field of energy storage and conversion materials and devices. Background technique [0002] The increase in global energy demand and the crisis of traditional non-renewable fuels are encouraging the research on high-efficiency and low-cost alternative energy sources such as fuel cells, air batteries, and metal-oxygen batteries. Oxygen electrochemistry (ORR / OER) is an outstanding technology for producing clean energy without emitting greenhouse gases. However, the efficiency of electrolysis of oxygen from water is limited due to the need for a large overpotential above the standard reaction potential (1.23 V). To minimize the overpotential of the two electrodes and harness wind and solar power to split water is a challenging task. The efficiency of oxygen electrochemistry largely depends on the composition and properties of the electrocatalyst. So far, Pt, Ru, Ir, a...

Claims

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Application Information

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IPC IPC(8): C25B11/06B01J35/00B01J27/24C25B1/04
CPCY02E60/36
Inventor 黄妞闫术芳曹星明
Owner CHINA THREE GORGES UNIV
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