Preparation method and application of low-load Pd/hollow carbon sphere oxygen reduction electrocatalyst

A technology of hollow carbon spheres and electrocatalysts, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the cumbersome preparation process, difficult industrial production, particle agglomeration and other problems, to achieve the effect of uniform shell thickness, promotion of adsorption and stable performance

Active Publication Date: 2020-06-02
OCEAN UNIV OF CHINA
View PDF6 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of the above-mentioned catalysts has the following problems: (1) Various carbon materials need to be pretreated, and additional amino groups are introduced to anchor the metal particles, thereby enhancing the force between the metal particles and the support and improving the dispersion of Pd nanoparticles (2) There is a certain phenomenon of particle agglomeration, and the preparation process is relatively

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 and application of low-load Pd/hollow carbon sphere oxygen reduction electrocatalyst
  • Preparation method and application of low-load Pd/hollow carbon sphere oxygen reduction electrocatalyst
  • Preparation method and application of low-load Pd/hollow carbon sphere oxygen reduction electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1, preparation of hollow carbon sphere nanomaterial (HCS-700)

[0036] In order to compare the performance difference between the Pd-free hollow carbon sphere oxygen reduction electrocatalyst and the low-loaded Pd / hollow carbon sphere oxygen reduction electrocatalyst, a hollow carbon sphere (HCS) was first prepared, and the specific preparation method included the following steps:

[0037] (a) Hydrothermal process: Weigh 54mg template agent PluronicP123 and 90mg sodium oleate to prepare aqueous solutions A with concentrations of 0.375mmol / L and 12mmol / L, respectively. Then weigh 231mg of 2,4-dihydroxybenzoic acid (DA) and 88mg of hexamethylenetetramine (HMT) to prepare aqueous solutions with concentrations of 20mmol / L and 8.3mmol / L, respectively, stir and dissolve for 30min to obtain solution B. Then, during the stirring process, the solution A was slowly added into the solution B, and the stirring was continued for 30 min to obtain the micellar solution C. ...

Embodiment 2

[0039] Embodiment 2, preparation of low loading Pd / hollow carbon sphere oxygen reduction electrocatalyst (Pd-HCS-500)

[0040] A kind of preparation method of low loading Pd / hollow carbon sphere nano material, comprises the steps:

[0041] (a) Hydrothermal process: Weigh 54mg template agent PluronicP123 and 90mg sodium oleate to prepare aqueous solutions A with concentrations of 0.375mmol / L and 12mmol / L, respectively. Then weigh 231mg of 2,4-dihydroxybenzoic acid (DA) and 88mg of hexamethylenetetramine (HMT) to prepare aqueous solutions with concentrations of 20mmol / L and 8.3mmol / L, respectively, stir and dissolve for 30min to obtain solution B. Then, during the stirring process, the solution A was slowly added into the solution B, and the stirring was continued for 30 min to obtain the micellar solution C. Then move the solution C into a polytetrafluoroethylene reaction kettle and place it in an oven, keep it at 160°C for 2 hours according to the heating rate program of 1°C / ...

Embodiment 3

[0044] Embodiment 3, preparation of low loading Pd / hollow carbon sphere oxygen reduction electrocatalyst (Pd-HCS-700)

[0045] A preparation method of a low-loaded Pd / hollow carbon sphere oxygen reduction electrocatalyst, comprising the steps of:

[0046] (a) Hydrothermal process: Weigh 54mg template agent PluronicP123 and 90mg sodium oleate to prepare aqueous solutions A with concentrations of 0.375mmol / L and 12mmol / L, respectively. Then weigh 231mg of 2,4-dihydroxybenzoic acid (DA) and 88mg of hexamethylenetetramine (HMT) to prepare aqueous solutions with concentrations of 20mmol / L and 8.3mmol / L, respectively, stir and dissolve for 30min to obtain solution B. Then, during the stirring process, the solution A was slowly added into the solution B, and the stirring was continued for 30 min to obtain the micellar solution C. Then move the solution C into a polytetrafluoroethylene reaction kettle and place it in an oven, keep it at 160°C for 2 hours according to the heating rate...

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
Shell thicknessaaaaaaaaaa
Diameteraaaaaaaaaa
Login to view more

Abstract

The preparation method comprises the following steps: carrying out self-assembly on a macromolecular template agent and a carbon source precursor in a hydrothermal process to synthesize a hollow polymer sphere; then, providing a simple and convenient double-solvent impregnation method for successfully loading PdCl4<2-> on the hollow polymer sphere; and finally, placing the reactant in a programmable atmosphere tube furnace for high-temperature carbonization at 500-900 DEG C to obtain a low-load Pd/hollow carbon sphere oxygen reduction electrocatalyst (Pd-HCS), which can serve as an efficient ORR electrocatalyst in an alkaline environment. The low-load Pd-HCS oxygen reduction electrocatalyst obtained by the method has a relatively high specific surface area, good conductivity and enough active sites, and shows relatively excellent oxygen reduction electrocatalytic performance, good stability and excellent methanol poisoning resistance activity. The preparation method is simple in process and low in cost, has certain universality, and has certain guiding significance for designing and developing a novel fuel cell cathode oxygen reduction electrocatalyst.

Description

technical field [0001] The invention belongs to the field of chemical energy materials, and in particular relates to the preparation of hollow carbon sphere-based oxygen reduction electrocatalysts, in particular to a low-load Pd / hollow carbon sphere oxygen reduction electrocatalyst used to catalyze the reduction of oxygen at the cathode of a fuel cell into water. Preparation method and application. Background technique [0002] In recent years, due to the depletion of traditional fossil energy sources and the increasing environmental pollution, research and development of new efficient, low-cost and clean renewable energy conversion and storage technologies, such as fuel cells, zinc-air batteries, and water splitting, are highly desired. Among them, the fuel cell is developing the fastest and is considered as the energy star of the 21st century. It can directly convert the chemical energy in the fuel and oxidant into electrical energy without being limited by the Carnot cycl...

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): B01J23/44B01J35/02H01M4/92
CPCB01J23/44B01J35/0033B01J35/026B01J35/0066H01M4/926Y02E60/50
Inventor 黄明华汪兴坤陈宗坤
Owner OCEAN UNIV OF CHINA
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