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Updated: Sep 10, 2025

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Liquid-Solid Interface Reactions Drive Enhanced Thermoelectric Performance in Ag2Se.

Yu Liu1,2, Tobias Kleinhanns2, Sharona Horta2

  • 1Anhui Province Engineering Research Center of Flexible and Intelligent Materials, School of Chemistry and Chemical Engineering, Hefei University of Technology, 230009, Hefei, China.

Journal of the American Chemical Society
|August 22, 2025
PubMed
Summary
This summary is machine-generated.

Silver selenide (Ag₂Se) thermoelectric performance is improved by using cadmium selenide (CdSe) complexes. This method stabilizes the material and enhances its thermoelectric figure of merit (zT) to 1.04.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Chemistry

Background:

  • Silver selenide (Ag₂Se) is a potential n-type thermoelectric material.
  • Its performance is hindered by high carrier concentration, inhomogeneity, and instability due to a narrow homogeneity range and silver ion (Ag⁺) diffusion.

Purpose of the Study:

  • To overcome the limitations of Ag₂Se for improved thermoelectric performance.
  • To engineer Ag₂Se-CdSe nanocomposites with enhanced stability and efficiency.

Main Methods:

  • Utilizing liquid-solid interface reactions with cadmium selenide (CdSe) complexes.
  • Controlling surface excess silver (Ag) and generating CdSe nanodomains to inhibit Ag⁺ diffusion and grain growth.

Main Results:

  • Achieved stoichiometric Ag₂Se with stable CdSe nanodomains.
  • Fabricated Ag₂Se-CdSe nanocomposites with a reproducible figure of merit (zT) of 1.04 between 300 and 390 K.
  • Elucidated interfacial reactions influencing microstructure and transport properties.

Conclusions:

  • Liquid-solid interface reactions offer a viable strategy for stabilizing Ag₂Se.
  • The developed Ag₂Se-CdSe nanocomposites demonstrate high and stable thermoelectric performance.
  • Understanding interfacial chemistry is key for designing advanced thermoelectric materials.