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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
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Ductile Ag5.98SSe0.6Te1.4 with High Room-Temperature Thermoelectric Performance.

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  • 1School of Materials Science and Engineering, Materials Genome Institute, Shanghai University, Shanghai, 200444, China.

Small (Weinheim an Der Bergstrasse, Germany)
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Summary

New ductile thermoelectric materials based on silver sulfide (Ag₂S) can convert body heat into electricity for wearable devices. Optimizing carrier concentration in Ag₅.₉₈SSe₀.₆Te₁.₄ significantly enhances thermoelectric performance and power output.

Keywords:
carrier concentration optimizationductilitythermoelectric devicesthermoelectric materials

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Energy Harvesting

Background:

  • Ductile thermoelectric materials offer a promising avenue for powering wearable technologies by converting body heat into electricity via the Seebeck effect.
  • Existing Ag₂S-based materials exhibit limitations in thermoelectric performance due to excess carrier concentration.
  • Addressing these limitations is crucial for advancing wearable power solutions.

Purpose of the Study:

  • To develop a novel Ag₂S-based ductile thermoelectric material with improved performance.
  • To optimize carrier concentration in Ag₂S-based materials for enhanced thermoelectric properties.
  • To demonstrate the potential of the new material in flexible thermoelectric devices.

Main Methods:

  • Synthesized Ag₅.₉₈SSe₀.₆Te₁.₄ by reducing anion electronegativity and creating cation deficiency.
  • Characterized thermoelectric properties including power factor and thermal conductivity at room temperature.
  • Fabricated and tested a flexible thermoelectric device using the novel material.

Main Results:

  • Achieved optimal carrier concentration in Ag₅.₉₈SSe₀.₆Te₁.₄, resulting in a high power factor (6.0 µW cm⁻¹ K⁻²) and low thermal conductivity (0.27 W m⁻¹ K⁻¹).
  • Obtained a record thermoelectric figure of merit (0.65) for Ag₂S-based ductile thermoelectrics, with good phase and mechanical stability.
  • Demonstrated a normalized maximum power density of 0.16 W m⁻¹ in a flexible device, an order of magnitude higher than existing flexible thermoelectric devices.

Conclusions:

  • The developed Ag₅.₉₈SSe₀.₆Te₁.₄ material represents a significant advancement in ductile thermoelectric technology.
  • This material shows great potential for efficient and stable power generation in wearable applications.
  • The findings pave the way for next-generation flexible thermoelectric generators.