Journal
NANO ENERGY
Volume 41, Issue -, Pages 501-510Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2017.10.003
Keywords
Thermoelectric; Power generation; Grain boundary engineering; Skutterudites; Nanocomposites
Categories
Funding
- National Natural Science Foundation of China [51374078, 51432004]
- Shanghai Committee of Science and Technology [16JC1401800]
- Opening Project of State Key Laboratory of High Performance Ceramics and Superfine Microstructure [SKL201507SIC]
- PCSIRT [IRT1221]
- Fundamental Research Funds for the Central Universities
- DHU Distinguished Young Professor Program
- NSF DMR program [1334713, 1333335]
- Solid-State Solar-Thermal Energy Conversion Center (S3TEC) an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-SC0001299/DE-FG02-09ER46577]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1333335] Funding Source: National Science Foundation
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There have been few demonstrations that grain boundary engineering results in higher power generation efficiencies despite serious interest in using the strategy to improve zT. Using both Yb2O3 nanoprecipitates that decorate grain boundaries and carbon nanotubes to further reduce thermal conductivity and improve mechanical strength, a maximum zT of 1.43 at 875 K and a device ZT of approximately 1.0 in Yb-filled CoSb3-based nanocomposites are achieved. The preparation procedure of these materials is repeatable in mass production. Thermoelectric power generation modules based on these high-performance materials demonstrate a thermoelectric conversion efficiency of 9.3% under a temperature difference of 558 K. The results highlight nanostructured grain boundary engineering as a strategy to improve conventional thermoelectric materials, and the realistic prospect of large-scale thermoelectric power generation using skutterudite-based nanocomposites is demonstrated.
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