Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 58, Issue 9, Pages 3688-3697Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.8b05569
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Funding
- NEDO Research and Development for Innovative Use of Unused Thermal Energy
- Mazda Foundation
- Shibuya Science Culture and Sports Foundation
- TEPCO Memorial Foundation
- International Joint Research Program for Innovative Energy Technology - Ministry of Economy, Trade and Industry, Japan
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The Cu-Fe-S system consists of earth-abundant low-toxicity elements, and it potentially has good thermoelectric properties. There are many different types of Cu-Fe-S compounds, and some are n-type semiconductors while others are p-type semiconductors. Here, we report a rapid low-cost colloid-chemical method to fabricate Cu-Fe-S thermoelectric materials using Cu2S and FeS nanoparticles as building blocks. The n- and p-type of the Cu-Fe-S nanobulk material can be readily tuned by changing the Cu2S/FeS volume ratio. The nanobulk materials lead to low lattice thermal conductivity ranging from 0.3 to 1.0 W m(-1) K-1. By blending Cu2S and FeS nanoparticles at a weight fraction of 9:1, we fabricated a nanocomposite consisting of bornite Cu5FeS4 as the main phase and other minor phases. This nanocomposite has a maximum dimensionless figure of merit (ZT) of 0.55 at 663 K, which is 45% higher than that of pristine Cu5FeS4.
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