Suppressing the dynamic precipitation and lowering the thermal conductivity for stable and high thermoelectric performance in BaCu2Te2 based materials
文献类型：期刊论文
| 作者 | Guo, K; Lin, JW; Li, Y; Zhu, YF; Li, X; Yang, XX; Xing, JJ; Yang, J; Luo, J; Zhao, JT |
| 刊名 | JOURNAL OF MATERIALS CHEMISTRY A
 |
| 出版日期 | 2020-03-14 |
| 期号 | 10页码:5323 |
| ISSN号 | 2050-7488 |
| DOI | 10.1039/d0ta00245c |
| 文献子类 | Article |
| 英文摘要 | Dynamic precipitation phenomena are usually observed in Cu- and Ag-based thermoelectric compounds undergoing a temperature rise, affecting the stability and thermoelectric figure of merit zT. The present work demonstrates that rational controlling of the Cu content would eliminate unstable factors in BaCu2Te2, beneficial for achieving stable and reliable thermoelectric materials. Over-stoichiometric Cu in BaCu2Te2 can not only optimize the hole concentration approaching the optimal one, but also lead to the stable degenerate semiconducting behaviors. More importantly, despite the intrinsically low lattice thermal conductivity originating from the small phonon group velocities and mean free path, the excess Cu content generates widely distributed Cu-rich nano-precipitates with a size of 20-50 nm. These nano-precipitates significantly contribute to low-frequency phonon scattering for further reducing the thermal conductivity, and thus more than 25% of the kappa reduction has been achieved at room temperature (0.95 W m(-1) K-1 for BaCu2Te2 and 0.70 W m(-1) K-1 for BaCu2.08Te2). A high figure of merit zT = 1.31 at 833 K has been realized for the sample BaCu2+xTe2 (x = 0.04), which is superior to the state of the art p-type Zintl phase thermoelectric materials. |
| WOS关键词 | PHYSICAL-PROPERTIES ; TRANSPORT ; COPPER ; AG9GASE6 |
| WOS研究方向 | Chemistry ; Energy & Fuels ; Materials Science |
| 语种 | 英语 |
| 出版者 | ROYAL SOC CHEMISTRY |
| 源URL | [http://ir.sic.ac.cn/handle/331005/28232]  |
| 专题 | 中国科学院上海硅酸盐研究所 |
| 推荐引用方式 GB/T 7714 | Guo, K,Lin, JW,Li, Y,et al. Suppressing the dynamic precipitation and lowering the thermal conductivity for stable and high thermoelectric performance in BaCu2Te2 based materials[J]. JOURNAL OF MATERIALS CHEMISTRY A,2020(10):5323. |
| APA | Guo, K.,Lin, JW.,Li, Y.,Zhu, YF.,Li, X.,...&Zhao, JT.(2020).Suppressing the dynamic precipitation and lowering the thermal conductivity for stable and high thermoelectric performance in BaCu2Te2 based materials.JOURNAL OF MATERIALS CHEMISTRY A(10),5323. |
| MLA | Guo, K,et al."Suppressing the dynamic precipitation and lowering the thermal conductivity for stable and high thermoelectric performance in BaCu2Te2 based materials".JOURNAL OF MATERIALS CHEMISTRY A .10(2020):5323. |
入库方式： OAI收割
来源：上海硅酸盐研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。