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Preparation method of au-ir nanochain electrocatalyst for water splitting and oxygen production

An electrocatalyst and nanochain technology, applied in nanotechnology, electrodes, electrolysis components, etc., to achieve the effect of industrialized hydrogen production, high yield and improved efficiency

Inactive Publication Date: 2019-08-30
SHANGLUO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the synthesis of one-dimensional Au-Ir catalysts by chemical deposition or hydrothermal method has not been reported

Method used

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  • Preparation method of au-ir nanochain electrocatalyst for water splitting and oxygen production
  • Preparation method of au-ir nanochain electrocatalyst for water splitting and oxygen production
  • Preparation method of au-ir nanochain electrocatalyst for water splitting and oxygen production

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Experimental program
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Effect test

Embodiment 1

[0024] Stir 2mL 0.5mol / L chloroauric acid aqueous solution and 2mL 0.5mol / L potassium bromide aqueous solution, then add 2mL 0.5mol / L iridium chloride aqueous solution and stir evenly, and adjust the pH of the mixture to 3 with hydrochloric acid, and finally add 1mL (0.027mmol) of formaldehyde was stirred evenly, and left to react at 180°C for 10 hours under airtight conditions, cooled to room temperature, centrifuged, washed with distilled water for 3 to 5 times, and dried in a vacuum oven at 60°C to obtain Au-Ir nano chain electrocatalyst. Depend on Figure 1~3 It can be seen that the prepared sample is a one-dimensional nano-chain structure with uniform size and rough surface. Depend on Figure 4 It can be seen that there are five diffraction peaks at 38.187, 44.385, 64.576, 77.567 and 81.722°, which are consistent with the standard card of Au(fcc) (PDF#65-2870); five are at 40.662, 47.313, 69.142, 83.445 and 88.066° The diffraction peaks are consistent with the standard...

Embodiment 2

[0026] Stir 2mL 0.5mol / L chloroauric acid aqueous solution and 1mL 0.5mol / L potassium bromide aqueous solution, then add 2mL 0.5mol / L iridium trichloride aqueous solution and stir evenly, and adjust the pH of the mixed solution to 5 with hydrochloric acid, and finally add 0.85mL (0.023mmol) of formaldehyde was stirred evenly, and left to react at 160°C for 8 hours under airtight conditions, cooled to room temperature, centrifuged, washed with distilled water for 3 to 5 times, and dried in a vacuum oven at 60°C to obtain Au-Ir nanochain electrocatalysts (see Figure 9 ).

Embodiment 3

[0028] 2mL 0.5mol / L chloroauric acid aqueous solution and 1mL 0.5mol / L potassium bromide aqueous solution were stirred evenly, then added 1.5mL 0.5mol / L iridium chloride aqueous solution and stirred evenly, and the pH of the mixed solution was adjusted to 4 with hydrochloric acid, and finally Add 1.2mL (0.033mmol) formaldehyde and stir evenly, let stand at 200°C for 12 hours under airtight conditions, cool to room temperature, centrifuge, wash with distilled water for 3 to 5 times, and dry in a vacuum oven at 60°C to obtain Au- Ir nanochain electrocatalysts (see Figure 10 ).

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Abstract

The invention discloses a preparation method of a gold-iridium nanoparticle chain electrocatalyst used in the oxygen production process adopting water splitting reaction, and belongs to the technicalfield of electrocatalysis and energy. The preparation method is characterized in that potassium bromide is used as a stabilizer, formaldehyde is used as a reducing agent, and chloroauric acid and iridium trichloride are reduced into the gold-iridium nanoparticle chain with a sawtooth-shaped surface by adopting a method that the chloroauric acid and iridium trichloride are heated in an aqueous solution. The gold-iridium nanoparticle chain obtained through the preparation method has a unique one-dimensional structure and rich active sites and has relatively high activity and stability in the catalytic oxygen evolution reaction in an alkaline medium, so that the gold-iridium nanoparticle chain can be used as an oxygen production catalyst through water splitting in an alkaline environment. Thepreparation method of the gold-iridium nanoparticle chain is simple and economic, and is suitable for industrial large-scale production.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis and energy, and in particular relates to a preparation method of an Au-Ir nano chain electrocatalyst used for splitting water to produce oxygen. Background technique [0002] China and other countries in the world are facing increasingly severe energy crisis. Hydrogen energy is one of the most promising ways to solve the crisis. Oxygen generation reaction / oxygen evolution reaction (OER), as one of the half-reactions of water splitting reaction, significantly affects the efficiency of hydrogen generation reaction / hydrogen evolution reaction, and has attracted much attention in recent years. So far, IrO 2 and RuO 2 are two effective OER catalysts in acidic and alkaline media. However, reducing the use of these catalysts and enhancing their catalytic activity are still great challenges due to their cost and reserves. The bimetallic catalyst not only improves the catalytic activity, but ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B11/08B22F9/24B82Y40/00
CPCB22F9/24B82Y40/00C25B1/04C25B11/097Y02E60/36
Inventor 柯曾波张小文李乐京崔卫红
Owner SHANGLUO UNIV
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