Coupled hydrothermal synthesis/hot pressing of PbSe/C@PbTe heterostructured composites with enhanced thermoelectric performance

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• 作者：Jing Liu ; Xiaoguang Wang ; Liu Wang ; Liangming Peng
• 关键词：C@PbTe ; Core&ndash ; shell ; PbSe ; Electrical properties ; Thermal properties
• 刊名：Materials Letters
• 出版年：15 February, 2014
• 年：2014
• 卷：117
• 期：Complete
• 页码：49-52
• 全文大小：1243 K

文摘

PbTe coated amorphous carbon sphere core-shell structure (C@PbTe) was embedded into PbSe nanopowders and subsequently assembled into macroscopic composites by hot pressing. Thermoelectric properties of the samples with 0, 1, and 5 wt% C@PbTe additions were examined between 300 and 550 K. Enhanced Seebeck coefficient and lower thermal conductivity are obtained in the PbSe/1 wt% C@PbTe sample. The maximum figure of merit is 0.54 at 400 K, showing a 13% improvement over that of the PbSe matrix. These findings facilitate the application of hydrothermally synthesized carbon spheres in thermoelectric materials and also provide a potential direction to enhance thermoelectric performance via constructing core-shell structures.