Journal
NANO ENERGY
Volume 26, Issue -, Pages 172-179Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2016.05.022
Keywords
Thermoelectric generator; Flexible; 1T MoS2; Transition metal dichalcogenides; Surface doping
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Funding
- National High Technology Research and Development Program of China (863 Program) [2013AA032205]
- China Postdoctoral Science Foundation [2014M560669]
- Fundamental Research Funds for the Central Universities [2014YJS137]
- US Air Force Office of Scientific Research [FA 9550-13-1-0085]
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Thermoelectric materials that can generate electricity from waste heat will play an important role in the global sustainable energy solution. Low dimensional materials open new routes to high performance thermoelectric properties due to their unique density of states with confined electrons and holes. Here, we report that the phase engineered two dimensional transition metal dichalcogenides represent a new class of high performance thermoelectric materials. The organolithium chemically exfoliated nanosheets of MoS2 containing a high concentration of metallic 1T phase MoS2 show superior thermoelectric properties, with a room temperature power factor of 73.1 mu W m(-1) K-2, which is much higher than the pristine graphene or single wall carbon nanotubes can yield. Our first principle calculations on mono layer 1T phase MoS2 provide physical insight of their metallic and hole conductive nature, which happens to be important origins of their advantageous thermoelectric properties. These metallic 1T phase MoS2 nanosheets also reveal interesting moisture sensitive thermoelectric properties, indicating their potential diverse applications not only as thermoelectric energy harvesting devices but also as self powered gas sensors. (C) 2016 Elsevier Ltd. All rights reserved.
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