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BaCu2Se2 based compounds as promising thermoelectric materials.

Jing Li¹, Li-Dong Zhao, Jiehe Sui

¹School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China. suijiehe@hit.edu.cn.

Dalton Transactions (Cambridge, England : 2003)

|December 23, 2014

Summary

Sodium doping significantly enhances the thermoelectric performance of barium copper selenide (BaCu2Se2) materials. This research achieves a peak thermoelectric figure of merit (ZT) of 1.0, paving the way for advanced thermoelectric applications.

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Area of Science:

Materials Science
Solid State Physics
Inorganic Chemistry

Background:

Thermoelectric materials are crucial for energy harvesting and solid-state cooling.
Copper selenides and sulfides have shown significant promise, driving research into related compounds.
Barium copper selenide (BaCu2Se2) is a material of interest for its potential thermoelectric properties.

Purpose of the Study:

To synthesize and investigate the thermoelectric properties of sodium (Na)-doped BaCu2Se2.
To evaluate the impact of Na doping on electrical conductivity, power factor, and thermal conductivity.
To determine the thermoelectric figure of merit (ZT) and assess the material's potential for practical applications.

Main Methods:

Synthesis of Na-doped BaCu2Se2 samples.
Measurement of thermoelectric properties (electrical conductivity, Seebeck coefficient, thermal conductivity) from 20 K to 773 K.
Analysis of thermal expansion coefficient.

Main Results:

Na doping at the Ba site increased electrical conductivity by two orders of magnitude.
A peak power factor of 8.2 μW cm(-1) K(-2) was achieved at 773 K.
A maximum ZT of 1.0 was obtained for Ba0.925Na0.075Cu2Se2 at 773 K, the highest reported for this material family.
Low thermal conductivity of 0.65 W m(-1) K(-1) was observed.
BaCu2Se2 exhibits volatilization above 473 K, necessitating protective coatings.

Conclusions:

Na doping is an effective strategy to significantly improve the thermoelectric performance of BaCu2Se2.
The achieved ZT of 1.0 demonstrates the potential of this material for thermoelectric energy conversion.
Further research is needed to address the volatilization issue for practical applications, possibly through protective coatings.