Enhancing thermoelectric performance of (Cu1-xAgx)2Se via CuAgSe secondary phase and porous design

Liu, Weidi and Shi, Xiaolei and Moshwan, Raza and Hong, Min and Yang, Lei and Chen, Zhi-Gang and Zou, Jin (2018) Enhancing thermoelectric performance of (Cu1-xAgx)2Se via CuAgSe secondary phase and porous design. Sustainable Materials and Technologies, 17 (e00076). pp. 1-8. ISSN 2214-9929

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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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version made available under Creative Commons Attribution License.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - No Department
Date Deposited: 21 Feb 2019 03:13
Last Modified: 04 Mar 2019 04:21
Uncontrolled Keywords: thermoelectric performance; Cu2Se; CuAgSe; pores; lattice thermal conductivity
Fields of Research : 03 Chemical Sciences > 0302 Inorganic Chemistry > 030206 Solid State Chemistry
10 Technology > 1007 Nanotechnology > 100708 Nanomaterials
09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
02 Physical Sciences > 0204 Condensed Matter Physics > 020403 Condensed Matter Modelling and Density Functional Theory
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970103 Expanding Knowledge in the Chemical Sciences
Identification Number or DOI: 10.1016/j.susmat.2018.e00076
URI: http://eprints.usq.edu.au/id/eprint/35484

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