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Synthesis and application of quaternary platinum-iron-rhodium-ruthenium nano-alloy with hierarchical structure

A hierarchical structure and nano-alloy technology, applied in nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, to achieve the effect of novel crystal structure, good stability and excellent catalytic performance

Active Publication Date: 2020-09-04
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention uses a solvothermal method to successfully synthesize a hierarchical structure quaternary platinum-iron-rhodium-ruthenium nano-alloy assembled by dendritic quaternary platinum-iron-rhodium-ruthenium alloys, which enhances the hydrogen evolution reaction catalytic performance of the catalyst and also improves stability. There is no literature report yet to use this method to synthesize hierarchically structured quaternary platinum-iron-rhodium-ruthenium nanoalloys

Method used

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  • Synthesis and application of quaternary platinum-iron-rhodium-ruthenium nano-alloy with hierarchical structure
  • Synthesis and application of quaternary platinum-iron-rhodium-ruthenium nano-alloy with hierarchical structure
  • Synthesis and application of quaternary platinum-iron-rhodium-ruthenium nano-alloy with hierarchical structure

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Experimental program
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Effect test

Embodiment 1

[0019] The synthesis and application of the quaternary platinum-iron-rhodium-ruthenium nano-alloy of hierarchical structure comprises the following steps:

[0020] (1) Add 36.4 mg of cetyltrimethylammonium bromide (CTAB) as a surfactant, and four metal salts of chloroplatinic acid, iron acetylacetonate, rhodium chloride, and ruthenium chloride into the organic solvent octylamine , the amount of metal used is 0.043 mmol, the ratio of platinum salt, iron salt, rhodium salt, and ruthenium salt metal precursor is 25:8:5:5, the volume of octylamine added is 6.2 mL, stirred at room temperature for 10 minutes, and ultrasonicated for 10 minutes , until the metal salt is completely dissolved;

[0021] (2) Add ascorbic acid to the mixed solution obtained in step (1) in an amount of 18 mg, and stir at room temperature for 10 minutes;

[0022] (3) Transfer the mixed solution obtained in step (2) to an autoclave for reaction for 8 hours, with the temperature controlled at 190°C;

[0023]...

Embodiment 2

[0025] (1) Add 36.4 mg of cetyltrimethylammonium bromide (CTAB) as a surfactant, and four metal salts of chloroplatinic acid, iron acetylacetonate, rhodium chloride, and ruthenium chloride into the organic solvent octylamine , the amount of metal used is 0.043 mmol, the ratio of platinum salt, iron salt, rhodium salt, and ruthenium salt metal precursor is 25:8:7:3, the volume of octylamine added is 6.2 mL, stirred at room temperature for 10 minutes, and ultrasonicated for 10 minutes , until the metal salt is completely dissolved;

[0026] (2) Add ascorbic acid to the mixed solution obtained in step (1) in an amount of 18 mg, and stir at room temperature for 10 minutes;

[0027] (3) Transfer the mixed solution obtained in step (2) to an autoclave for reaction for 8 hours, with the temperature controlled at 190°C;

[0028] (4) The product obtained in step (3) is cooled, washed, and centrifuged to obtain a quaternary platinum-iron-rhodium-ruthenium nano-alloy, and the sample is ...

Embodiment 3

[0030] (1) Add 36.4 mg of cetyltrimethylammonium bromide (CTAB) as a surfactant, and four metal salts of chloroplatinic acid, iron acetylacetonate, rhodium chloride, and ruthenium chloride into the organic solvent octylamine , the amount of metal used is 0.043 mmol, the ratio of platinum salt, iron salt, rhodium salt, and ruthenium salt metal precursor is 25:8:3:7, the volume of octylamine added is 6.2 mL, stirred at room temperature for 10 minutes, and ultrasonicated for 10 minutes , until the metal salt is completely dissolved;

[0031] (2) Add ascorbic acid to the mixed solution obtained in step (1) in an amount of 18 mg, and stir at room temperature for 10 minutes;

[0032] (3) Transfer the mixed solution obtained in step (2) to an autoclave for reaction for 8 hours, with the temperature controlled at 190°C;

[0033] (4) The product obtained in step (3) is cooled, washed, and centrifuged to obtain a quaternary platinum-iron-rhodium-ruthenium nano-alloy, and the sample is ...

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Abstract

The invention discloses synthesis and application of a quaternary platinum-iron-rhodium-ruthenium nano-alloy with a hierarchical structure. The synthesis is characterized in that the quaternary platinum-iron-rhodium-ruthenium nano-alloy with the hierarchical structure is novel in morphology and uniform in size, and the hierarchical structure formed by assembling 42-62 nm quaternary platinum-iron-rhodium-ruthenium nano-alloy monomers. In an alkaline hydrogen evolution reaction, the mass activity at the voltage of -0.07 V is 4.44 A mgpt <-1 >, and the specific activity at the voltage of -0.07 Vis 11.33 mA cm <-2 >, and the mass activity at the voltage of -0.07 V and the specific activity at the voltage of -0.07 V are 6.16 times and 11.9 times that of commercial carbon supported platinum respectively. In a stability test, after the current density of the quaternary platinum-iron-rhodium-ruthenium nano-alloy with the hierarchical structure is kept at 10 mA cm <-2 > for 20 hours, the massactivity is only reduced by 5% compared with the initial mass activity, and the commercial carbon-loaded platinum is reduced by 44%.

Description

technical field [0001] The invention relates to a high-performance cathode electrocatalyst for hydrogen evolution reaction and a synthesis method, in particular to the synthesis and application of a hierarchically structured quaternary platinum-iron-rhodium-ruthenium nano-alloy. Background technique [0002] The hydrogen economy system uses hydrogen as an energy carrier, which is a renewable and clean energy source. Catalysts are the key components to accelerate these reaction processes, and the synthesis and design of excellent electrocatalysts is the primary task to realize this system. Platinum is currently the best catalyst for hydrogen evolution, but the high price of platinum hinders its large-scale application, so how to improve the catalytic activity of platinum and reduce the amount of metal platinum has become a problem in this field. To overcome the above problems, other metals can be added to form an alloy with platinum to improve the activity and stability of t...

Claims

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Application Information

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IPC IPC(8): B01J23/89B82Y30/00C25B11/06C25B1/02B22F9/24B22F1/00
CPCB01J23/8906B82Y30/00C25B11/04C25B1/02B22F9/24B22F1/054B22F1/07Y02E60/36
Inventor 袁强谢子璇陈锐
Owner GUIZHOU UNIV
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