Journal
NANO ENERGY
Volume 16, Issue -, Pages 367-374Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2015.07.012
Keywords
Thermoelectric; High ZT; Copper selenide; Nanostructure engineering
Categories
Funding
- Australian Research Council
- QLD government [2011002414]
- China Scholarship Council
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As one of promising thermoelectric materials with intrinsic high figure of merit (ZT), Cu2Se provides opportunities to tackle the global energy crisis via converting waste heat into electricity. Here, beta-phase Cu2Se nanostructures were synthesized using a facile and largescale solvothermal method. After sparking plasma sintering, the resultant Cu2Se pellets show outstanding thermoelectric properties with an ultra-low lattice thermal conductivity (as low as similar to 0.2 W m(-1) K-1) that resulted in a recorded high ZT of 1.82 at 850K. Through detailed structural investigations, high-densities small-angle grain boundaries with dislocations have been found in sintered Cu2Se pellets through nanostructure engineering, which results in additional phonon scattering to reduce the lattice thermal conductivity. This study provides an important approach to enhance thermoelectric performance of potential thermoelectric materials. (C) 2015 Elsevier Ltd. All rights reserved.
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