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Abstract <p>Thermoelectric generators (TEGs) are a promising strategy for harvesting body heat to power wearable electronics. However, the development of a TEG that combines high mechanical durability, effective utilization of vertical temperature gradients, and scalable fabrication remains a major challenge exacerbated by the inherent brittleness of most inorganic thermoelectric materials. We report a TEG where cotton yarn serves as a flexible substrate that is coated with silver selenide (Ag<sub>2</sub>Se), which is an intrinsically ductile thermoelectric material. Ag<sub>2</sub>Se is coated on cotton yarns by a simple solution process that eliminates the need for high temperatures while preserving scalability and mechanical flexibility. Systematic optimization of the Ag<sub>2</sub>Se-coated yarns resulted in a figure of merit of 0.343 at 295&#xa0;K. A yarn-based TEG was fabricated that maintained excellent durability over 5000 bending cycles with a 6&#xa0;mm radius of curvature. Under real-world conditions for wearable applications, the yarn TEG generated 0.326&#xa0;µW at a temperature difference of 2.8&#xa0;K (stationary) and 0.604&#xa0;µW at a temperature difference of 4.4&#xa0;K (walking). This work establishes a scalable and practical platform for integrating high-performance inorganic thermoelectric materials into flexible and wearable energy-harvesting systems.</p> Graphical Abstract <p></p>

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Wearable Inorganic Yarn Thermoelectric Generator Based on Solution-Processed Silver Selenide

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年1月17日

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  • Woomin Park,
  • Yeong A Kang,
  • Hyun-Sik Kim,
  • Eun Jin Bae,
  • Young Hun Kang,
  • Mijeong Han,
  • Kwang-Suk Jang,
  • Jungwon Kim

摘要

Abstract

Thermoelectric generators (TEGs) are a promising strategy for harvesting body heat to power wearable electronics. However, the development of a TEG that combines high mechanical durability, effective utilization of vertical temperature gradients, and scalable fabrication remains a major challenge exacerbated by the inherent brittleness of most inorganic thermoelectric materials. We report a TEG where cotton yarn serves as a flexible substrate that is coated with silver selenide (Ag2Se), which is an intrinsically ductile thermoelectric material. Ag2Se is coated on cotton yarns by a simple solution process that eliminates the need for high temperatures while preserving scalability and mechanical flexibility. Systematic optimization of the Ag2Se-coated yarns resulted in a figure of merit of 0.343 at 295 K. A yarn-based TEG was fabricated that maintained excellent durability over 5000 bending cycles with a 6 mm radius of curvature. Under real-world conditions for wearable applications, the yarn TEG generated 0.326 µW at a temperature difference of 2.8 K (stationary) and 0.604 µW at a temperature difference of 4.4 K (walking). This work establishes a scalable and practical platform for integrating high-performance inorganic thermoelectric materials into flexible and wearable energy-harvesting systems.

Graphical Abstract