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Related Concept Videos

Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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High-efficiency and reliable same-parent thermoelectric modules using Mg3Sb2-based compounds.

Meng Jiang1, Yuntian Fu1, Qihao Zhang2

  • 1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials & College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.

National Science Review
|May 14, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed efficient and reliable thermoelectric modules using Mg3Sb2-based alloys. These devices convert waste heat into electricity, offering a sustainable energy solution with improved performance over existing technologies.

Keywords:
Mg3Sb2low-temperature joining and high-temperature servicemodule reliabilitypower generation efficiencysame-parent thermoelectric modules

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Area of Science:

  • Materials Science
  • Energy Conversion
  • Solid State Physics

Background:

  • Thermoelectric modules offer a sustainable method for converting waste heat into electricity.
  • Mg3Sb2-based alloys are promising due to their non-toxic, abundant elements and good thermoelectric properties.
  • Advancement in robust Mg3Sb2-based thermoelectric modules has been limited.

Purpose of the Study:

  • To develop robust, high-efficiency thermoelectric modules utilizing n-type and p-type Mg3Sb2-based alloys.
  • To overcome fabrication challenges and thermomechanical stress in Mg3Sb2 modules.
  • To demonstrate superior performance and reliability compared to existing modules.

Main Methods:

  • Fabrication of multiple-pair thermoelectric modules using n-type and p-type Mg3Sb2-based alloys.
  • Utilizing matched thermomechanical properties of thermoelectric legs for easier module assembly.
  • Implementation of a diffusion barrier layer and a novel joining technique.

Main Results:

  • An integrated all-Mg3Sb2-based module achieved a conversion efficiency of 7.5% at a 380 K temperature difference.
  • The module's efficiency surpassed that of current state-of-the-art same-parent thermoelectric modules.
  • The module demonstrated excellent reliability, maintaining stable efficiency through 150 thermal cycling shocks (approx. 225 hours).

Conclusions:

  • The developed Mg3Sb2-based thermoelectric modules represent a significant advancement in waste heat to electricity conversion.
  • The novel fabrication and joining techniques enable high efficiency and reliability.
  • These findings pave the way for more widespread application of sustainable thermoelectric energy solutions.