a co 9 the s 8 Preparation method of composite array electrode with nitrogen-doped carbon

A composite array, nitrogen-doped carbon technology, applied in electrodes, chemical instruments and methods, electrolytic components, etc., can solve problems such as insufficient, poor stability, and small specific surface area of ​​nanoparticles

Active Publication Date: 2021-02-02
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to pure Co 9 S 8 Due to the small specific surface area of ​​nanoparticles, insufficient electrical conductivity, easy aggregation, poor stability in alkaline media, and lack of intrinsic active sites, it is far from enough to use them to achieve dual-functional catalytic performance.

Method used

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  • a co <sub>9</sub> the s <sub>8</sub> Preparation method of composite array electrode with nitrogen-doped carbon
  • a co <sub>9</sub> the s <sub>8</sub> Preparation method of composite array electrode with nitrogen-doped carbon
  • a co <sub>9</sub> the s <sub>8</sub> Preparation method of composite array electrode with nitrogen-doped carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 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. Soak the carbon paper prepared above 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 it. The carbon paper was put into a tube furnace, reacted at 350 °C for 2 h under the airflow of thiourea (0.2 g), 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 @C in situ electrodes.

[0021] figure 1 The OER and ORR linear voltammetry sweep (LSV) diagrams of the electrode prepared in Example 1. It can be seen from the figure th...

Embodiment 2

[0025] At room temperature, 0.15 M CoCl 2 ∙ 6H 2 O, 6.25% urea was dissolved in 40 mL 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. Soak the carbon paper prepared above in 50 mL of Tris base with a concentration of 0.01 M and a pH of 8.5, add 30 mg of dopamine, stir at room temperature for 24 h, rinse the sample three times with deionized water, and then dry it. The carbon paper was put into a tube furnace, reacted at 350 °C for 2 h under the airflow of thiourea (0.2 g), then continued to heat up to 700 °C for 2 h, cooled to room temperature naturally, and took out to obtain CFP / Co 9 S 8 @C in situ electrodes.

[0026] Figure 4The OER and ORR linear voltammetry sweep (LSV) diagrams of the electrode prepared in Example 2. It can be seen from the figure that when the current den...

Embodiment 3

[0028] At room temperature, 0.15 M CoCl 2 ∙ 6H 2 O, 6.25% urea was dissolved in 40 mL deionized water. Soak the carbon paper in the solution and react it in a 90°C water bath for 2 hours, cool it down to room temperature naturally, take out the carbon paper, rinse it with deionized water three times, and dry it for later use. Soak the carbon paper prepared above in 50 mL of Tris base with a concentration of 0.01 M and a pH of 8.5, add 50 mg of dopamine, stir at room temperature for 24 h, rinse the sample three times with deionized water, and then dry it. The carbon paper was put into a tube furnace, reacted at 350 °C for 2 h under the air flow of thiourea (0.2 g), then continued to heat up to 700 °C for 2 h, and cooled to room temperature naturally to obtain CFP / Co 9 S 8 @C in situ electrodes.

[0029] Figure 5 The OER and ORR linear voltammetry sweep (LSV) diagrams of the electrode prepared in Example 3. It can be seen from the figure that when the current density of t...

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Abstract

The present invention provides a bifunctional Co 9 S 8 The preparation method of the composite array electrode with nitrogen-doped carbon is to use the chemical bath deposition method to prepare the in-situ electrode of the basic cobalt salt needle array, and then use dopamine to grow polydopamine on the surface of the basic cobalt salt array, and then add sulfur under the protective atmosphere. Urea is vulcanized by CVD method, during which polydopamine is transformed into nitrogen-doped carbon materials, and basic cobalt salts are transformed into Co in a thiourea atmosphere. 9 S 8 . The product obtained by the technical scheme of the present invention has excellent electrocatalytic oxygen reduction reaction (ORR) due to having a variety of high electrocatalytic active sites, including nitrogen doped active sites in carbon materials and other lattice defects caused thereby. ) performance; Co 9 S 8 It has good electrocatalytic oxygen evolution reaction (OER) performance; in addition, Co 9 S 8 The heterojunction formed with carbon materials also has excellent electrocatalytic 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] With the growing demand for clean and sustainable energy, it is a scientific challenge for modern society to develop low-cost, highly active, and durable renewable energy technologies such as fuel cells and metal-air batteries. It is worth noting that realizing these advanced technologies in our daily life is highly dependent on a series of electrochemical reactions, such as oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). However, these oxygen-based electrochemical reactions are limited by slow kinetics and efficiencies in renewable energy technologies. Noble metal-based electrocatalysts discovered so far (such as Pt / C, RuO 2 , Ir / C) have high catalytic activity for ORR or OER. However, none of the commercial catalysts can perform both reactions satisfac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/091C25B1/02B01J27/043
Inventor 黄妞闫术芳曹星明
Owner CHINA THREE GORGES UNIV
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