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Co cluster/SiO2 composite material and preparation method and application thereof

A composite material and cluster technology, applied in the field of electrocatalysis, can solve problems such as instability of metal nanoclusters, and achieve the effects of improving electrochemical stability, small anode OER overpotential, and a wide range of synthetic raw materials.

Active Publication Date: 2020-08-07
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]In recent years, metal nanoclusters have excellent catalytic activity due to their unique structure, and have attracted extensive attention from researchers, among which transition metal nanoclusters are considered to be One of the powerful alternatives to replace noble metal OER catalysts, but metal nanoclusters are in an unstable state and tend to agglomerate to form nanoparticles. However, the methods for synthesizing stable state transition metal clusters are relatively complicated, and the catalytic performance needs to be further improved.

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  • Co cluster/SiO2 composite material and preparation method and application thereof
  • Co cluster/SiO2 composite material and preparation method and application thereof
  • Co cluster/SiO2 composite material and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0042] Embodiment 1 (best embodiment)

[0043] (1) Synthesis of nano-copper sulfide aqueous solution: pipette 180mL of deionized water into a 250mL round bottom flask, weigh 34mg of copper chloride dihydrate (0.2mmol) and 40mg of trisodium citrate dihydrate (0.136 mmol) into it , magnetically stirred at room temperature to form a light blue solution evenly; weigh 0.1201g of sodium sulfide nonahydrate, add deionized water to dissolve and set the volume in a 50mL volumetric flask (the concentration of sodium sulfide nonahydrate is 10 mmol / L), and then 20mL of Na 2 S·9H 2 O aqueous solution was added dropwise to the above solution, and magnetic stirring was continued at room temperature for 5 minutes, and the reaction mixture turned dark brown; the mixture was moved to a constant temperature water bath, heated to 90°C, continued to heat and react for 15 minutes, and finally obtained The dark green copper sulfide nanoparticle solution was cooled in an ice-water bath, and the sol...

Embodiment 2

[0047] Embodiment 2 (preferred, different heat treatment temperatures)

[0048] (1) Synthesis of nano-copper sulfide aqueous solution: pipette 180mL of deionized water into a 250mL round bottom flask, weigh 34mg of copper chloride dihydrate (0.2mmol) and 40mg of trisodium citrate dihydrate (0.136 mmol) into it , magnetically stirred at room temperature to form a light blue solution evenly; weigh 0.1201g of sodium sulfide nonahydrate, add deionized water to dissolve and set the volume in a 50mL volumetric flask (the concentration of sodium sulfide nonahydrate is 10 mmol / L), and then 20mL of Na 2 S·9H 2 O aqueous solution was added dropwise to the above solution, and magnetic stirring was continued at room temperature for 5 minutes, and the reaction mixture turned dark brown; the mixture was moved to a constant temperature water bath, heated to 90°C, continued to heat and react for 15 minutes, and finally obtained The dark green copper sulfide nanoparticle solution was cooled ...

Embodiment 3

[0052] Embodiment 3 (preferred, different heat treatment temperatures)

[0053] (1) Synthesis of nano-copper sulfide aqueous solution: pipette 180mL of deionized water into a 250mL round bottom flask, weigh 34mg of copper chloride dihydrate (0.2mmol) and 40mg of trisodium citrate dihydrate (0.136 mmol) into it , magnetically stirred at room temperature to form a light blue solution evenly; weigh 0.1201g of sodium sulfide nonahydrate, add deionized water to dissolve and set the volume in a 50mL volumetric flask (the concentration of sodium sulfide nonahydrate is 10 mmol / L), and then 20mL of Na 2 S·9H 2 O aqueous solution was added dropwise to the above solution, and magnetic stirring was continued at room temperature for 5 minutes, and the reaction mixture turned dark brown; the mixture was moved to a constant temperature water bath, heated to 90°C, continued to heat and react for 15 minutes, and finally obtained The dark green copper sulfide nanoparticle solution was cooled ...

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Abstract

The invention belongs to the field of electrocatalysis, and relates to a Co cluster / SiO2 composite material and a preparation method and application thereof. According to the invention, a zero-valenttransition metal cluster is anchored in SiO2 mesopores through a confinement strategy; carboxyl-modified copper sulfide nanoparticles are used as a template, glycine and transition metal cobalt ions are combined through covalent interaction and electrostatic interaction; and a bimetallic strategy is used for adjusting an electronic structure, electron transfer between transition metal ions and a reaction intermediate is increased through a synergistic effect, the reaction kinetics of OER is promoted, and a reaction rate is increased. Besides, more catalytic active sites can be exposed throughthe mesoporous stable small-size nanometer metal cluster, and meanwhile, a contact area of the material with an electrolyte is increased, so OER catalytic activity is improved.

Description

technical field [0001] The invention belongs to the field of electrocatalysis and relates to a Co cluster / SiO 2 Composite material and its preparation method and application, especially a kind of mesoporous SiO used for electrochemical oxygen evolution reaction 2 Loaded Co cluster composite material and preparation method. Background technique [0002] Hydrogen is considered to be an ideal choice to replace fossil fuels. However, the efficiency of hydrogen production from electrolysis of water has long been limited by the oxygen evolution reaction (OER), which requires a high overpotential. The mainstream OER catalysts, such as ruthenium oxide (RuO 2 ) and iridium oxide (IrO 2 ) Constrained by the high cost and low reserves of noble metals, finding cheap and highly active alternative catalysts is crucial for commercial hydrogen production. [0003] In recent years, metal nanoclusters have excellent catalytic activity due to their unique structures, and have attracted exte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75C25B1/04C25B11/06
CPCB01J23/75C25B1/04C25B11/091B01J35/391B01J35/396B01J35/33Y02E60/36
Inventor 饶德伟杨欢颜晓红
Owner JIANGSU UNIV
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