Preparation method of dual-element Pt/PdPt/Pt sandwich tube wall porous nanotube and porous nanotube

A technology of nanotubes and tube walls, which is applied in the field of preparation of bimetallic layered porous structure nanotubes, can solve the problems of insignificant improvement in catalyst stability and decrease in mass specific activity, so as to improve activity, improve utilization rate, and reduce usage volume effect

Active Publication Date: 2021-08-17
YANSHAN UNIV
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: Shouheng Sun and Shaojun Guo et al. (J.Am.Chem.Soc.2011, 133, 15354-15357) prepared ultrafine FePtPd nanowires by thermal decomposition method, and their methanol Oxidation peak cluster 0.665V (Pt nanoparticles) decreased to 0.614V (FePtPd nanowires), but the stability of the catalyst was not significantly improved
Subsequently, Hongwen Huang and LeiGao et al. (J.Am.Chem.Soc.2019, 141, 18083-18090) used a two-step

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of dual-element Pt/PdPt/Pt sandwich tube wall porous nanotube and porous nanotube
  • Preparation method of dual-element Pt/PdPt/Pt sandwich tube wall porous nanotube and porous nanotube
  • Preparation method of dual-element Pt/PdPt/Pt sandwich tube wall porous nanotube and porous nanotube

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The invention provides a method for preparing a porous nanotube with a tube wall of a Pt / PdPt / Pt sandwich structure, comprising the following steps:

[0025] S1. The procedure of utilizing the Kirkendall effect to form PdPt nanotubes: Pd nanowire powder, polyvinylpyrrolidone (PVP), NaI, ascorbic acid (hereinafter also referred to as AA) and chloroplatinic acid (H 2 PtCl 6 ) dissolved in an organic solvent, mixed and stirred at 180-290°C for 1-2 hours to prepare PdPt nanotube powder,

[0026] S2. Tube wall etching process: disperse the PdPt nanotube powder obtained in step S1 in water and heat it to 45-60°C, add hole etching solution dropwise therein, react for 10-60min, and filter to obtain a tube wall with a rough porous surface. Porous nanotubes with Pt / PdPt / Pt sandwich structure, in which the pore etching solution contains FeCl 3 , NaI, PVP, HCl components.

[0027] In the S1 step of the present invention, mainly using Pd nanowires with a diameter as the substrate...

Embodiment 1

[0049] Mix and disperse 200mg of PVP (polyvinylpyrrolidine provided by Tianjin Kemiou, molecular weight 1-130W), 100mg of NaI, 15mg of AA, and 3mg of Pd nanowire powder in 15mL of ethylene glycol, ultrasonically for 20min and place in 50mL In the flask, preheat with magnetic stirring in an oil bath at 90°C for 20 minutes, then raise the temperature of the oil bath to 190°C at a rate of 1°C / min, during which time 3 mL of 0.1 mM / L H 2 PtCl 6 The ethylene glycol solution was slowly added into the reaction flask, and kept heating and stirring at 190°C for 1-2 hours. After the reaction was completed, the reactant was centrifuged at 5000 r / min for 10 min after the temperature was lowered to room temperature, washed twice with ethanol, and finally dried in a blast drying oven at 70° C. to obtain PdPt bimetallic nanotube powder.

[0050] Take 2 mg of the nanotube powder prepared in the above step (1) and disperse it in 3 mL of purified water and preheat it in a water bath at 50 °C fo...

Embodiment 2

[0053] Mix and disperse 350mg of PVP (polyvinylpyrrolidine provided by Tianjin Kemiou, molecular weight 1-130W), 200mg of NaI, 25mg of AA, and 4mg of Pd nanowire powder in 20mL of ethylene glycol, ultrasonically for 25min and place in 50mL In the flask, preheat with magnetic stirring in an oil bath at 110°C for 20 minutes, then raise the temperature of the oil bath to 200°C at a rate of 1°C / min, during which time 4mL of 0.1mM / L H 2 PtCl 6 Ethylene glycol solution was slowly added into the reaction flask, and kept heating and stirring at 200°C for 1.5h. After the reaction was completed, the reactant was centrifuged at 6500 r / min for 10 min after the temperature was lowered to room temperature, washed twice with ethanol, and finally dried in a blast drying oven at 70° C. to obtain PdPt bimetallic nanotube powder.

[0054] Take 4 mg of the nanotube powder prepared in the above step (1) and disperse it in 3-6 mL of pure water and preheat it in a water bath at 50 °C for 10 min, th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Outer diameteraaaaaaaaaa
The inside diameter ofaaaaaaaaaa
Login to view more

Abstract

The invention provides a porous nanotube with a rough surface and a dual-element Pt/PdPt/Pt interlayer tube wall and a preparation method of the porous nanotube. The Kirkendall effect is used for enabling platinum ions to generate a nucleation phenomenon on the surface of a palladium nanowire, internal palladium is gradually removed through gaps of a deposition layer, and then the hollow PdPt nanotube with the outer diameter being 8.6 nm and the wall thickness being about 2.2 nm is formed; the nanotube is further processed to form an interlayer structure with a tube wall element of Pt/PdPt/Pt. According to the product PdPt nanotube, the platinum element can be fully exposed on the inner side and the outer side of the nanotube wall, the utilization rate of platinum in the material is greatly increased, the tube wall interlayer contains the PdPt double elements, and the catalytic reaction activity is greatly improved through the stress and strain effect between the double metals. When the catalyst is used as a fuel cell cathode reaction catalyst, the reaction activity of the catalyst is greatly improved in an oxygen reduction reaction, the active specific surface area ECSA of the catalyst is 1.46 times that of commercial Pt/C sold in the market, the mass activity (MA) of the catalyst is 14.3 times that of the commercial Pt/C, and the actual specific activity (SA) of the catalyst is 9.64 times that of the commercial Pt/C.

Description

technical field [0001] The invention relates to a method for preparing a bimetallic layered porous nanotube, in particular to a method for preparing a porous nanotube whose tube wall is a Pt / PdPt / Pt sandwich structure, and the porous nanotube prepared by the method. [0002] technical background [0003] With the rapid development of science and technology, the consumption of resources in human production and life is gradually increasing, many natural resources are gradually scarce, and at the same time, the pollution of the environment is becoming more and more serious. Among them, the air pollution caused by automobile exhaust produced by traditional automobiles cannot be ignored. At present, electric vehicles using proton exchange membrane fuel cells as energy devices have gradually entered people's field of vision and developed rapidly. Proton exchange membrane fuel cells have both high power density, Many advantages such as easy storage and zero emission can not only sol...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M4/92H01M4/88H01M4/86
CPCH01M4/921H01M4/8605H01M4/88H01M4/8657H01M2004/8684Y02E60/50
Inventor 高发明于丹陈冰晋婧冯羽霏刘倩赵奕淞
Owner YANSHAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap