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具有特殊本征热电性能的正交Zintl相NaCdSb
作者:小柯机器人 发布时间:2022/10/22 22:59:57

上海大学骆军团队开发了具有特殊本征热电性能的正交Zintl相NaCdSb。相关研究成果于2022年10月13日发表在《德国应用化学》。

许多Zintl相具有窄带隙、多能带行为、理想电荷传输隧道和松散束缚阳离子等特点,是很有前途的热电材料。

该文中,研究人员展示了一种具有优异本征热电性能的新型Zintl相NaCdSb。原始NaCdSb的实验空穴浓度为2.9 × 1018 cm-3,计算带隙为0.5 eV。随着温度的升高,空穴浓度逐渐升高并接近其最佳值,导致673 K时的高功率因数为11.56μW cm-1 K-2。超低的热导率源自于小声子群速度和短声子寿命,这归因于Cd-Sb键的结构非谐性。因此,在没有任何掺杂优化或结构修改的情况下,在673 K下获得了1.3的最大zT,这表明NaCdSb是一种显著的热电化合物,具有很大的性能改进潜力。

附:英文原文

Title: NaCdSb: An Orthorhombic Zintl Phase with Exceptional Intrinsic Thermoelectric Performance

Author: Kai Guo, Yuting Zhang, Song Yuan, Qinghang Tang, Chen Lin, Pengfei Luo, Jiong Yang, Shusheng Pan, Li-Dong Zhao, Guofeng Cheng, Jiye Zhang, Jun Luo

Issue&Volume: 2022-10-13

Abstract: Many Zintl phases are promising thermoelectric materials owning to their features like narrow bandgaps, multiband behaviors, ideal charge transport tunnels, and loosely bound cations. Herein we show a new Zintl phase NaCdSb with exceptional intrinsic thermoelectric performance. Pristine NaCdSb exhibits semiconductor behaviors with an experimental hole concentration of 2.9 × 1018 cm-3 and a calculated bandgap of 0.5 eV. As the temperature increases, the hole concentration rises gradually and approaches its optimal one, leading to a high power factor of 11.56 μW cm-1 K-2 at 673 K. The ultralow thermal conductivity is derived from the small phonon group velocity and short phonon lifetime, ascribed to the structural anharmonicity of Cd-Sb bonds. As a consequence, a maximum zT of 1.3 at 673 K has been achieved without any doping optimization or structural modification, demonstrating that NaCdSb is a remarkable thermoelectric compound with great potential for performance improvement.

DOI: 10.1002/anie.202212515

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202212515

期刊信息

Angewandte Chemie:《德国应用化学》,创刊于1887年。隶属于德国化学会,最新IF:12.959
官方网址:https://onlinelibrary.wiley.com/journal/15213773
投稿链接:https://www.editorialmanager.com/anie/default.aspx