Ecofriendly Highly Robust Ag8 SiSe6 -Based Thermoelectric Composites with Excellent Performance Near Room Temperature

ACS Applied Materials & Interfaces
Qinghui JiangJunyou Yang

Abstract

Bi2(TeSe)3 is a dominant n-type thermoelectric material used in commercial applications. However, its toxicity and rarity hamper further large-scale industrial applications. Herein, we develop a Ag8SiSe6-based composite as a promising n-type semiconductor with the advantages of nontoxicity and elemental abundance. Ag8SiSe6 composites with Ag2Se and Si nanoprecipitation are fabricated by a unique precipitation reaction sensitive to the hot pressing process. The energy-filtering effect between these phases optimizes electrical resistivity (∼14.59 μΩ·m) and the Seebeck coefficient (above -150 μV·K-1) of the composites, resulting in a maximum power factor of ∼1772 μW·m-1·K-2(@125 °C), which is the highest value in an argyrodite system near room temperature. Nanoprecipitation of Ag2Se and Si can also scatter more phonons and further reduce the lattice thermal conductivity to 0.20 W·m-1·K-1. As a result, a maximum ZT value of ∼0.9 (@125 °C) and an average ZT value of ∼0.7 (25-200 °C) are obtained in the composite with 12 vol % Ag2Se and 0.23 vol % Si, which is sintered at 525 °C. These thermoelectric properties are comparable to those of a commercial n-type Bi2Te3 compound. In addition, the Ag8SiSe6 composite has robust mechanical pr...Continue Reading

References

Jan 26, 2008·Nature Materials·G Jeffrey Snyder, Eric S Toberer
Apr 23, 2013·Nature Materials·S IshiwataY Tokura
Jul 16, 2015·Advanced Materials·Takahiro YamadaHideaki Nagai
Aug 27, 2015·Journal of the American Chemical Society·Gangjian TanMercouri G Kanatzidis
Mar 7, 2017·Advanced Materials·Tiejun ZhuXinbing Zhao
Dec 24, 2018·ACS Applied Materials & Interfaces·Xingchen ShenXiaoyuan Zhou

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