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One-pot template-free solvothermal synthesis of Ptcu hollow nanocage materials

A hollow nano- and solvothermal technology is applied in the synthesis field of caged nano-materials, which can solve the problems of complex synthesis process and long consumption time, and achieve the effect of simple and convenient process, easy control, and improved catalytic activity and stability.

Active Publication Date: 2020-10-09
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these traditional synthesis methods are multi-step construction, the synthesis process is complex and time-consuming, so the construction of nanocages by one-pot method has always been a difficulty for researchers.

Method used

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  • One-pot template-free solvothermal synthesis of Ptcu hollow nanocage materials
  • One-pot template-free solvothermal synthesis of Ptcu hollow nanocage materials
  • One-pot template-free solvothermal synthesis of Ptcu hollow nanocage materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Reagents and instruments

[0019] Cetyltrimethylammonium chloride, platinum acetylacetonate, copper chloride (CuCl 2 2H 2 O), arginine, oleylamine, simethicone, ethanol, and cyclohexane were purchased from Shanghai Chemical Plant, and all reagents were of analytical grade. Scanning electron microscope (SEM, JSM-6390LV, JEOL, Japan), transmission electron microscope (TEM, JEM-2100, JEOL, Japan), the accelerating voltage is 200kV. The chemical composition of PtCu NCs material was determined by energy spectrometer (EDX, Oxford), X-ray diffraction (XRD), and the chemical valence states of Pt and Cu were determined by X-ray photoelectron spectroscopy (XPS).

[0020] The shape-directing agent cetyltrimethylammonium chloride, the metal precursor platinum acetylacetonate and copper chloride (CuCl 2 2H 2 O) and reducing agent arginine were placed in a reaction vessel filled with 5mL solvent oleylamine and mixed evenly by ultrasonic, wherein the molar concentration of hexadec...

Embodiment 2

[0029] In this example, the reducing agent arginine concentration was changed (30mM, 80mM), and other experimental conditions were kept unchanged as in Example 1. The prepared PtCu NPs material was displayed in the support material, the hollow porous structure disappeared, and the particles The uniformity becomes poor, the aggregation between particles is serious, and the particle size becomes larger.

Embodiment 3

[0031] In this example, histidine and glutamic acid were used to replace arginine, and other experimental conditions were kept unchanged as in Example 1. The prepared PtCu NPs material was displayed in the support material, and the hollow porous morphology disappeared. into solid irregular particles.

[0032] According to Examples 1-3, it can be seen that the concentration of the reducing agent, the type of the reducing agent and the reaction time are all crucial in the process of forming the hollow nanocage structure.

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Abstract

The invention discloses a one-pot template-free solvothermal method for synthesizing PtCu hollow nanocage materials, and belongs to the technical field of synthesis of caged nanomaterials. The key points of the technical solution of the present invention are as follows: the morphology directing agent cetyltrimethylammonium chloride, the metal precursors platinum acetylacetonate and copper chloride, the reducing agent arginine and the solvent oleylamine are placed in a reaction vessel and Mix evenly, then place the obtained mixed material in an oil bath and heat to 160°C for 8 hours. After the reaction is completed, cool to room temperature, centrifuge, wash, and dry to obtain PtCu hollow nanocage material. The preparation process of the invention is simple, convenient and easy to control, and the catalytic activity and stability of the prepared PtCu hollow nanocage material for oxygen reduction reaction, ethylene glycol oxidation reaction and glycerol oxidation reaction are significantly improved.

Description

technical field [0001] The invention belongs to the technical field of synthesis of cage-like nanomaterials, and in particular relates to a method for synthesizing PtCu hollow nano-cage (PtCu NCs) materials by a one-pot template-free solvothermal method. Background technique [0002] With the rapid population growth and massive consumption of fossil energy, the whole world is facing the double pressure of energy crisis and environmental pollution. As a clean energy alternative technology, fuel cell is attracting more and more attention. Platinum (Pt) catalysts are the most efficient single-metal catalysts in fuel cell cathode catalysis applications. However, the high price of Pt, low cathodic oxygen reduction activity, and low resistance to CO toxicity limit its large-scale commercial application. Therefore, how to reduce the amount of Pt while improving its cathodic oxygen catalytic activity and stability has become one of the key scientific issues in the basic scientific ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01J35/02B01J35/00
CPCB01J23/8926B01J35/40
Inventor 王爱军黄先燕冯九菊蒋榴瑛张小芳
Owner ZHEJIANG NORMAL UNIVERSITY