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Pseudopolymorphic Phase Engineering for Improved Thermoelectric Performance in Copper Sulfides.

Tian-Yu Yang1, Shi-Wei Gu1, Yi-Xin Zhang1

  • 1Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China.

Advanced Materials (Deerfield Beach, Fla.)
|October 30, 2023
PubMed
Summary

Pseudopolymorphism engineering in copper sulfide (Cu2-xS) enhances thermoelectric performance. Doping with CuBr2 created specific pseudopolymorphic phases, boosting the ZT value significantly for energy applications.

Keywords:
(pseudo-)polymorphic phase engineeringatomic-resolution scanning transmission electron microscopycopper sulfidethermoelectric materials

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Area of Science:

  • Solid-state chemistry and materials science
  • Crystallography and mineralogy
  • Energy conversion materials

Background:

  • Polymorphism and pseudopolymorphism are common in solids, impacting material properties.
  • Controlling these phenomena is challenging but crucial for advanced applications.
  • Thermoelectric materials like copper sulfide (Cu2-xS) are vital for energy conversion.

Purpose of the Study:

  • To apply the pseudopolymorphic phase (PP) concept to enhance the thermoelectric properties of Cu2-xS.
  • To investigate the effect of CuBr2 doping on the crystal structure and thermoelectric performance of Cu2-xS.
  • To explore the potential of PP engineering in improving thermoelectric materials.

Main Methods:

  • CuBr2 doping of Cu2-xS to induce pseudopolymorphic phase transformations.
  • Measurement of thermoelectric figure of merit (ZT) at elevated temperatures.
  • Atomic-resolution scanning transmission electron microscopy (STEM) to analyze crystal structures and interfaces.

Main Results:

  • A peak ZT value of 1.25 was achieved at 773 K in Cu1.8S doped with 3 wt% CuBr2.
  • The ZT value was 2.3 times higher than that of pristine Cu1.8S.
  • STEM confirmed the transformation to a PP-engineered high digenite phase and the formation of interfaces enhancing phonon scattering.

Conclusions:

  • Pseudopolymorphic phase (PP) engineering is an effective strategy to improve thermoelectric performance in copper sulfide compounds.
  • The formation of specific PPs and their interfaces significantly enhances phonon scattering, a key factor in thermoelectric efficiency.
  • This approach holds promise for optimizing other thermoelectric materials and energy conversion technologies.