Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for improving thermoelectric properties of bismuth sulfide polycrystal

A technology of thermoelectric properties and bismuth sulfide, applied in chemical instruments and methods, polycrystalline material growth, crystal growth, etc., can solve problems such as high electrical conductivity and low thermal conductivity, and achieve high electrical conductivity, low thermal conductivity, and high migration The effect of rate sum

Active Publication Date: 2012-05-09
香河汇文节能科技有限公司
View PDF4 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, for excellent polycrystalline thermoelectric materials, high electrical conductivity and low thermal conductivity are required, and there is a contradiction in the optimization of grain size. It is impossible to solve the problem of obtaining high electrical conductivity and low thermal conductivity by adjusting the grain size. rate of contradiction

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
  • Method for improving thermoelectric properties of bismuth sulfide polycrystal
  • Method for improving thermoelectric properties of bismuth sulfide polycrystal
  • Method for improving thermoelectric properties of bismuth sulfide polycrystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] Bismuth sulfide nanopowder (MA powder) prepared by mechanical alloying method and (001) oriented single crystal bismuth sulfide nanorod (NR powder) synthesized by hydrothermal method were mixed in mass ratio, ultrasonically dispersed in absolute ethanol for 1 minute, Dry at 30-150°C for 30-300 minutes and grind by hand in an agate mortar. The ground powder is placed in a graphite mold, and a polycrystalline bismuth sulfide block is prepared by a spark plasma sintering process.

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
sizeaaaaaaaaaa
diameteraaaaaaaaaa
lengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for improving thermoelectric properties of bismuth sulfide polycrystal and belongs to the technical field of energy materials. The method is characterized by comprising the following steps of: mixing bismuth sulfide nano powder prepared by a mechanical alloying method with (001)-oriented monocrystal bismuth sulfide nanorod powder synthesized by a hydrothermal method, ultrasonically dispersing in absolute ethanol for 10-200 minutes, drying and then manually grinding in an agate mortar for 10-100 minutes; and placing ground powder in a graphite mold, sintering at 300-500 DEG C by adopting a spark plasma sintering process, and maintaining the temperature for 0-30 minutes to prepare a bismuth sulfide polycrystal block. Because the spark plasma sintering process has high heating rate, thus the growth and fusion of crystals are inhibited, the monocrystal nanorod structure is retained in the polycrystal block to form a fast channel for carrier migration, and the electric transmission performance and thermoelectric property of the bismuth sulfide polycrystal are greatly improved; and the method has the advantages of simplicity in required equipment, easiness in operation, low cost, significant effect and the like.

Description

technical field [0001] The invention belongs to the technical field of energy materials, in particular to a method for improving the thermoelectric properties of bismuth sulfide polycrystals, and involves mechanical alloying, hydrothermal synthesis and discharge plasma sintering technologies. Background technique [0002] With the continuous development of social economy, environmental and energy issues are paid more and more attention by human beings. Thermoelectric materials can directly realize the mutual conversion of heat energy and electric energy. Thermoelectric devices are pollution-free, zero-emission, light in structure, small in size and long in life, and are increasingly attracting people's attention. Thermoelectric modules with thermoelectric devices as core components have broad application prospects in semiconductor refrigeration and thermoelectric batteries. In the competition with conventional refrigeration methods and traditional power sources, the key to ...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C30B28/02C30B29/46
Inventor 张波萍葛振华张丽娟韩成功
Owner 香河汇文节能科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com