General Screening Rules and Segmented Optimization Strategy for Efficient Thermoelectric Devices Validated by...

Area of Science:

• Materials Science
• Energy Conversion
• Solid State Physics

Background:

• Segmentation enhances thermoelectric device efficiency by utilizing materials with distinct properties at different temperatures.
• Optimizing material compatibility is essential for maximizing thermoelectric conversion efficiency.
• Current methods lack universal adaptability for selecting optimal segmented thermoelectric materials.

Purpose of the Study:

• To develop a theoretical model for screening and identifying optimal segmented thermoelectric material combinations.
• To validate the theoretical model using simulations and experimental data.
• To construct and test a segmented thermoelectric generator using environmentally friendly and high-performance materials.

Main Methods:

• Incorporation of materials' compatibility factor and relative current density into the material screening process.
• Validation of the theoretical model through COMSOL finite element simulations.
• Experimental construction and testing of a segmented thermoelectric power generation device.

Main Results:

• A segmented thermoelectric device was constructed using n-type Mg3(Sb,Bi)2 and Bi0.5Sb1.5Te3-GeTe.
• The device achieved a maximum conversion efficiency of 10.4% at a temperature difference of 440 K.
• A peak output power of 0.41 W was recorded for the segmented thermoelectric device.

Conclusions:

• The theoretical model provides a robust framework for selecting optimal segmented thermoelectric materials.
• The developed segmented thermoelectric device demonstrates high efficiency and output power.
• This research lays the groundwork for designing advanced, efficient thermoelectric power generation systems.