Studies on the Bi2Te3-Bi2Se3-Bi2S3 system for mid-temperature thermoelectric energy conversion
Studies on the Bi2Te3-Bi2Se3-Bi2S3 system for mid-temperature thermoelectric energy conversion
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DOI：
10.1039/c2ee23549h
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发表时间：
2013-02-01
影响因子：
32.5
通讯作者：
Ren, Zhifeng
中科院分区：
文献类型：
--
作者：
Liu, Weishu;Lukas, Kevin C.;Ren, Zhifeng
碲化铋（Bi2Te3）及其合金作为热电材料在室温下的冷却应用已被广泛研究。我们报道了对Bi2Te3-Bi2Se3-Bi2S3体系中许多化合物的系统研究。所有样品均采用高能球磨-热压法制备。在所研究的化合物中，Bi2Te2S1在300℃时ZT峰值接近0.8，Bi2Se1S2在500℃时ZT峰值接近0.8。结果表明，这些化合物可用于中温发电。在25℃冷侧和500℃热侧条件下，基于这些n型材料的分段元件热电转换的支腿效率可能达到12.5%，如果配对合适的p型支腿，则可以在相同温度范围内与最先进的n型材料（包括碲化铅、硒化铅、硫化铅、填充skutterudites和半Heuslers）竞争。
Bismuth telluride (Bi2Te3) and its alloys have been widely investigated as thermoelectric materials for cooling applications at around room temperature. We report a systematic study on many compounds in the Bi2Te3-Bi2Se3-Bi2S3 system. All the samples were fabricated by high energy ball milling followed by hot pressing. Among the investigated compounds, Bi2Te2S1 shows a peak ZT similar to 0.8 at 300 degrees C and Bi2Se1S2 similar to 0.8 at 500 degrees C. The results show that these compounds can be used for mid-temperature power generation applications. The leg efficiency of thermoelectric conversion for segmented elements based on these n-type materials could potentially reach 12.5% with a cold side at 25 degrees C and a hot side at 500 degrees C if appropriate p-type legs are paired, which could compete well with the state-of-the-art n-type materials within the same temperature range, including lead tellurides, lead selenides, lead sulfides, filled-skutterudites, and half Heuslers.