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Preparation and application of dendritic crystal Au@GQDs@PtPb core-shell structure nano composite material

A technology of nanocomposite materials and core-shell structure, which is applied in the research of catalytic oxidation performance of alkaline methanol and the preparation of polydendritic Au@GQDs@PtPb nanocatalysts, which can solve the problems of low Pt utilization rate, poor resistance to CO poisoning, Problems hindering the commercialization process of DMFC

Active Publication Date: 2020-09-15
NORTHWEST NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its poor resistance to CO poisoning, low Pt utilization, and high cost have seriously hindered the commercialization of DMFCs.

Method used

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  • Preparation and application of dendritic crystal Au@GQDs@PtPb core-shell structure nano composite material
  • Preparation and application of dendritic crystal Au@GQDs@PtPb core-shell structure nano composite material
  • Preparation and application of dendritic crystal Au@GQDs@PtPb core-shell structure nano composite material

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Experimental program
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Embodiment 1

[0033] Example 1. A polydendrite Au@GQDs@Pt 3.5 Preparation of Pb core-shell nanocatalyst

[0034] (1) Preparation of GQDs: Weigh 300 mg of graphite powder, ultrasonically mix it in a mixed acid of 20 mL of nitric acid and 60 mL of sulfuric acid, then continuously stir and reflux in an oil bath at 120 °C for 12 h, and cool down to room temperature naturally after the reaction is terminated. The solution was diluted into 300 mL of deionized water and neutralized with sodium carbonate, followed by removal of sodium sulfate and sodium nitrate salts in the solution with a 240 nm filter membrane in a -4 °C ice-water bath. Finally, the prepared solution was dialyzed against deionized water for 2 days in a dialysis bag (retained molecular weight 3500 Da) to obtain graphene quantum dots (GQDs).

[0035] (2) Preparation of Au@GQDs nanoparticles: Take 35 mg of GQDs prepared in step (1), add 35 mL of water and stir for 5 min, then add 25.4 mM 200 μL of chloroauric acid (HAuCl 4 ), then...

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Abstract

The invention discloses a surface dendritic crystal Au@GQDs@PtPb core-shell structure composite material which takes Au nanoparticles as a core, GQDs as an interlayer and PtPb alloy as a shell layer,and the Au nanoparticles, the GQDs and the PtPb alloy are combined to form a dendritic crystal core-shell structure. Au@GQDs@Pt core-shell nano dendritic crystal is used as a substrate, and the Au@GQDs@Pt core-shell structure nano composite material is obtained through a reaction of reducing a precursor Pb(NO3)2 by ascorbic acid. Due to the electronic effect of PtPb and the synergistic effect of Au-Pt metal, due to the dispersity of the GQDs and a special core-shell structure, the electro-catalytic activity (the catalytic performance thereof is 30-40 times that of commercial Pt / C) of methanoland the tolerance and stability to CO poisoning are greatly improved, and the material has potential application prospects in DMFCs.

Description

technical field [0001] The invention belongs to the field of chemistry, and in particular relates to the preparation of a polydendrite Au@GQDs@PtPb nano-catalyst using AA as a green reducing agent and GQDs as a dispersant and the research on its catalytic oxidation performance for alkaline methanol. Background technique [0002] In recent years, direct methanol fuel cells (DMFCs) have attracted extensive attention due to their wide range of fuel sources, safe and convenient storage and transportation, low operating temperature, high energy conversion efficiency, green friendliness, simple cell structure, and flexible assembly. Noble metal catalysts (mainly platinum) are widely used as anode catalysts for the methanol oxidation reaction (MOR) due to their efficient catalytic activity with significant potential for further improvement. However, their poor resistance to CO poisoning, low Pt utilization, and high cost severely hinder the commercialization of DMFCs. Therefore, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/92H01M4/88H01M8/1011B82Y30/00
CPCH01M4/8657H01M4/921H01M4/88H01M8/1011B82Y30/00Y02E60/50
Inventor 张东霞李金灵孟博文张克辉张乾坤邵涛李宇周喜斌
Owner NORTHWEST NORMAL UNIVERSITY
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