Details

Autor(en) / Beteiligte

• Gu, Yan
• Ai, Wen
• Chen, Jiaxin
• Zhao, Anqi
• Hu, Xiaohui
• Zong, Pengan
• Pan, Lin
• Lu, Chunhua
• Wan, Chunlei
• Wang, Yifeng

Titel

Cellular structured Cu2Sn0.8Co0.2S3 with enhanced thermoelectric performance realized by liquid-phase sintering

Ist Teil von

• Journal of materials chemistry. A, Materials for energy and sustainability, 2023-01, Vol.11 (3), p.1447-1454

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2023

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• As an eco-friendly and earth-abundant thermoelectric material, P-type Cu2SnS3 has been studied intensively, revealing a maximal ZT of ∼0.85 in Cu2Sn0.8Co0.2S3. Preliminarily in this work, increasing sintering temperature realized a high power factor of ∼14 μW cm−1 K−2 with a detrimental increase of electronic thermal conductivity and resulted in a lowered ZT of ∼0.6 at 773 K. Accordingly, a Sn-assisted liquid-phase sintering was adopted, obtaining a series of cellular structured Cu2Sn0.8Co0.2S3–xSn (x = 0–0.06) bulks with Cu2Sn0.8Co0.2S3 grains mainly isolated by monoclinic-phase-rich boundaries with dense dislocation arrays, which functioned as barriers for both low-energy carriers and phonons at the same time. This caused a dramatic reduction of electrical conductivity and electronic thermal conductivity (maximally by 90% for both), with a simultaneous enhancement of Seebeck coefficient and a modest sacrifice of power factor, while more importantly, a strongly suppressed lattice thermal conductivity was observed. Finally, a maximum ZT of ∼1.03 at 773 K was achieved in the Cu2Sn0.8Co0.2S3–0.05Sn composite.