期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 49, 页码 45746-45754出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b16781
关键词
thermoelectric; mechanical; MgB2 doping; bismuth telluride; carrier density optimization
资金
- National Natural Science Foundation of China [21805196]
- Natural Science Foundation of Guangdong Province, China [2018A030310416]
- Foundation for Distinguished Young Talents in Higher Education of Guangdong, China [2017KQNCX178]
- Shenzhen Science and Technology Research Grant [JCYJ20180305124020928]
- Shenzhen Clean Energy Research Institute
The Bi2Te3-based alloys have been commercialized for the applications of energy harvesting and refrigeration for decades. However, the commercial Bi2Te3-based alloys produced by the zone-melting (ZM) method usually show poor mechanical strength and crack problems as well as the sluggish figure of merit ZT, especially for the less-progressed n-type samples. In this work, we have simultaneously enhanced the thermoelectric and mechanical performance of the one-step spark plasma sintering (SPS)-derived n-type Bi2Te2.7Se0.3 alloys just by doping a small amount of superconducting material MgB2 where Mg and B atoms can play significant roles in carrier density optimization and hardness enhancement. Besides the optimization of carrier density, the MgB2 doping can also increase the carrier mobility but decrease the lattice and bipolar thermal conductivity, leading to a peak ZT of 0.96 at 325 K and an average ZT of 0.88 within 300-500 K in the 0.5% MgB2-doped Bi2Te2.7Se0.3 (BTSMB) alloys. The peak ZT and average ZT of our optimized BTSMB samples are comparable and higher than those of the state-of-the-art commercial ZM ingot. Moreover, the optimized BTSMB sample also exhibits almost 70% enhancement in hardness compared with the ZM ingot. Our results demonstrate the great potential of the MgB2 doping strategy for mass production of SPS-derived Bi2Te3-based alloys in one-step sintering.
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