Enhancing thermoelectric performance of (Cu1-xAgx)2Se via CuAgSe secondary phase and porous design
Article
Article Title | Enhancing thermoelectric performance of (Cu1-xAgx)2Se via CuAgSe secondary phase and porous design |
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ERA Journal ID | 214258 |
Article Category | Article |
Authors | Liu, Weidi (Author), Shi, Xiaolei (Author), Moshwan, Raza (Author), Hong, Min (Author), Yang, Lei (Author), Chen, Zhi-Gang (Author) and Zou, Jin (Author) |
Journal Title | Sustainable Materials and Technologies |
Journal Citation | 17, pp. 1-8 |
Article Number | e00076 |
Number of Pages | 8 |
Year | 2018 |
Publisher | Elsevier BV |
Place of Publication | Netherlands |
ISSN | 2214-9929 |
2214-9937 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.susmat.2018.e00076 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S2214993718301337 |
Abstract | In the field of thermoelectrics, Cu2Se has attracted extensive attention due to its ultralow lattice thermal conductivity (κl) deriving from its superionicity. Here, we develop a solvothermal method to synthesize Ag-alloyed Cu2Se powders, subsequently sintered to form porous pellets by spark plasma sintering. After detailed characterization, we found that CuAgSe secondary phase forms when Ag has easily surpassed its solubility limit of ~1 at. % and the chemical reaction during the spark plasma sintering causes the formations of the porous structure. Benefiting from these structural features, a very low κl of ~0.23 W m−1 K−1 and in turn an improved figure of merit of ~1.1 at 773 K were secured in the (Cu0.93Ag0.07)2Se pellet. This study suggests that the thermoelectric performance of Cu2Se can be further enhanced by reducing κl via effective engineering methods, such as porosity engineering and introducing additional secondary phase. |
Keywords | thermoelectric performance; Cu2Se; CuAgSe; pores; lattice thermal conductivity |
ANZSRC Field of Research 2020 | 340210. Solid state chemistry |
401807. Nanomaterials | |
401605. Functional materials | |
510403. Condensed matter modelling and density functional theory | |
Byline Affiliations | University of Queensland |
Centre for Future Materials | |
Sichuan University, China | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5059/enhancing-thermoelectric-performance-of-cu1-xagx-2se-via-cuagse-secondary-phase-and-porous-design
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