Preparation method of concave cuboid Pt-Ir alloy nanocrystal catalyst

A technology of alloy nanocrystals and cubes, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as difficulty in forming alloys, delamination, etc., and achieve the effect of enhancing poisoning ability

Inactive Publication Date: 2018-08-24
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, due to the differences in the standard reduction potentials of different metals and the ratio of metal atoms, the order of the metals in the reduction process and the phenomenon of stratification are difficult to form ideal alloys.

Method used

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  • Preparation method of concave cuboid Pt-Ir alloy nanocrystal catalyst
  • Preparation method of concave cuboid Pt-Ir alloy nanocrystal catalyst
  • Preparation method of concave cuboid Pt-Ir alloy nanocrystal catalyst

Examples

Experimental program
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Embodiment 1

[0026] The preparation method of the concave cubic Pt-Ir alloy nanocrystalline catalyst in the present embodiment is realized according to the following steps:

[0027] (1) Preparation of choline chloride-urea-based deep eutectic solvent: choline chloride and urea are added into a round bottom flask with a molar ratio of 1:2, sealed, and placed in a glycerin bath at 80°C until a molten state is formed Afterwards, it was stirred by magnetic force until it became a colorless liquid, and the choline chloride-urea group deep eutectic solvent was obtained, which was set aside.

[0028] (2) Preparation of plating solution: Dissolve 518mg of platinum precursor potassium hexachloroplatinate and 142mg of iridium precursor iridium trichloride in the deep eutectic solvent prepared in 100ml of step (1), prepare 10mM hexachloroplatinic acid Potassium and 4 mM iridium chloride in a choline chloride-urea based deep eutectic solvent solution.

[0029] (3) Preparation of glassy carbon electro...

Embodiment 2

[0032] The preparation method of the concave cubic Pt-Ir alloy nanocrystalline catalyst in the present embodiment is realized according to the following steps:

[0033] The "518 mg platinum precursor potassium hexachloroplatinate" used in step (2) in Example 1 was replaced with "486 mg platinum precursor chloroplatinic acid hexahydrate". The remaining steps in this embodiment are the same as those in Example 1.

[0034] The Pt-Ir alloy nanocrystals prepared in Example 1 and Example 2 were characterized by scanning electron microscopy and transmission electron microscopy, which proved that the prepared nanoparticles had a concave cubic structure and the surface was a {hk0} high-index crystal plane.

[0035] Using ethanol and formic acid as probe molecules, the electrocatalytic oxidation performance of the prepared concave cubic Pt-Ir alloy nanocrystalline catalyst was evaluated.

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Abstract

The invention discloses a preparation method of a concave cuboid Pt-Ir alloy nanocrystal catalyst having a high-index crystal surface structure, and belongs to the technical field of preparation of afuel cell catalyst. The Pt-Ir alloy catalyst exists in a green and novel non-aqueous medium, namely a deep-eutectic solvent, and a concave cuboid Pt-Ir alloy nanocrystal with a {hk0} high-index crystal surface-structure surface is prepared by employing an electrochemical cyclic voltammetry method under a condition without any surfactant. The surface of the concave cuboid Pt-Ir alloy nanocrystal catalyst is a high-index crystal surface, the concave cuboid Pt-Ir alloy nanocrystal catalyst is provided with an opening surface structure, a large amount of active sites are provided, the poison capability of an intermediate body resistant to CO and the like is remarkably improved by a dual-functional mechanism of an alloy surface structure, and the concave cuboid Pt-Ir alloy nanocrystal catalysthas excellent electrocatalytic performance on fuel micromolecules such as formic acid, methyl alcohol and ethyl alcohol.

Description

technical field [0001] The invention relates to the field of fuel cell catalysts, in particular to a method for preparing a Pt-Ir alloy nano-crystal catalyst based on a low-eutectic solvent and a high-index crystal face concave cube. Background technique [0002] Fuel cells can directly convert the chemical energy of fuel into electrical energy, and are praised by the American "Time Magazine" as "the most important new energy technology in the 21st century". Among them, electrocatalyst is the most critical material in fuel cell components, which has a significant impact on the performance, stability and cost of the battery. At present, fuel cell catalysts are still dominated by platinum-based nanomaterials, and their performance is mainly affected by the size of the catalyst (ie, quantum effects), surface structure (ie, surface atomic arrangement), and chemical composition (ie, electronic effects). A large number of basic studies on metal single crystal electrodes have show...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92B82Y30/00
CPCB82Y30/00H01M4/921Y02E60/50
Inventor 韦露毛宇杰赵新生聂新明魏永生李建伟
Owner XUZHOU NORMAL UNIVERSITY
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