期刊
ADVANCED SCIENCE
卷 5, 期 7, 页码 -出版社
WILEY
DOI: 10.1002/advs.201800278
关键词
half-Heusler compounds; power generation; simultaneous optimization; thermoelectric materials
资金
- U.S. Department of Energy [DE-SC0010831]
- National Natural Science Foundation of China [51272038, 51672037]
- National Program on Key Basic Research Project (973 program) [2013CB933301]
- Academic Exchange Special Fund at the University of Electronic Science and Technology of China
Conversion efficiency and output power are crucial parameters for thermoelectric power generation that highly rely on figure of merit ZT and power factor (PF), respectively. Therefore, the synergistic optimization of electrical and thermal properties is imperative instead of optimizing just ZT by thermal conductivity reduction or just PF by electron transport enhancement. Here, it is demonstrated that Nb0.95Hf0.05FeSb has not only ultrahigh PF over approximate to 100 mu W cm(-1) K-2 at room temperature but also the highest ZT in a material system Nb0.95M0.05FeSb (M = Hf, Zr, Ti). It is found that Hf dopant is capable to simultaneously supply carriers for mobility optimization and introduce atomic disorder for reducing lattice thermal conductivity. As a result, Nb0.95Hf0.05FeSb distinguishes itself from other outstanding NbFeSb-based materials in both the PF and ZT. Additionally, a large output power density of approximate to 21.6 W cm(-2) is achieved based on a single-leg device under a temperature difference of approximate to 560 K, showing the realistic prospect of the ultrahigh PF for power generation.
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