Professor Yue Chen of the Department of Mechanical Engineering and his collaborators worked on the research for the topic “Realizing a High Thermoelectric Conversion Efficiency in Zintl-phase NaCdSb via Suppressing the Intrinsic Carrier Excitation”. The research findings were recently published in Advanced Functional Materials on December 8, 2024.
Details of the publication:
Realizing a High Thermoelectric Conversion Efficiency in Zintl-phase NaCdSb via Suppressing the Intrinsic Carrier Excitation
Kejia Liu, Chen Chen, Jinxuan Cheng, Xiaojing Ma, Juan Li, Xin Bao, Haiqi Li, Qian Zhang, and Yue Chen, article in Advanced Functional Materials
Abstract
Zintl-phase NaCdSb compound exhibits exceptional intrinsic thermoelectric performance. However, the low-temperature carrier concentration of NaCdSb significantly deviates from the ideal, which greatly limits its thermoelectric efficiency. Herein, a stepwise strategy is proposed to enhance the thermoelectric performance of the NaCdSb-based Zintl phase. This approach effectively improves the power factor while maintaining low lattice thermal conductivity. Consequently, the Na0.99Cd0.995Ag0.005Sb achieves a zT value of 1.41 at 673 K, with an average zT of 0.81 over the temperature range of 300–673 K. Furthermore, the NaCdSb-based single-leg device demonstrates a respectable conversion efficiency of ≈7% at a temperature difference of 373 K. These findings highlight the potential of 1-1-1 type Zintl-phase NaCdSb as a high-performance thermoelectric material. This breakthrough encourages further research into Zintl-phase thermoelectric materials.
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