Evaluating the potential for high thermoelectric efficiency of silver selenide

Day, Tristan; Drymiotis, Fivos; Zhang, Tiansong; Rhodes, Daniel; Shi, Xun; Chen, Lidong; Snyder, G. Jeffrey

doi:10.1039/c3tc31810a

Cited by 118 publications

(163 citation statements)

References 18 publications

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“…In the superionic phase, cations exhibit liquid-like diffusivity [3,4] and this disordered nature typically results in a very low lattice thermal conductivity (<1 W m −1 K −1 ). Many of the superionic compounds, particularly those that are also good electric conductors, indeed show promising thermoelectric properties as exemplified by Cu 2 Se [1,5], Cu 2 S [6,7], Ag 2 Se [8,9], and Zn 4 Sb 3 [10]. Cation movement is seen to be suppressed with the addition of lithium.…”

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confidence: 89%

Enhanced stability and thermoelectric figure-of-merit in copper selenide by lithium doping

Kang

Pöhls

Aydemir

et al. 2017

Materials Today Physics

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Superionic thermoelectric materials have been shown to have high figure-ofmerits, leading to expectations for efficient high-temperature thermoelectric generators. These compounds exhibit extremely high cation diffusivity, comparable to that of a liquid, which is believed to be associated with the low thermal conductivity that makes superionic materials good for thermoelectrics. However, the superionic behavior causes cation migration that leads to device deterioration, being the main obstacle for practical applications. It has been reported that lithium doping in superionic Cu 2-x Se leads to suppression of the Cu ion diffusivity, but whether the material will retain the promising thermoelectric properties had not yet been investigated. Here, we report a maximum zT > 1.4 from Li 0.09 Cu 1.9 Se, which is higher than what we find in the undoped samples. The high temperature effective weighted mobility of the doped sample is found higher than Cu 2-x Se, while the lattice thermal conductivity remains similar. We find signatures of suppressed bipolar conduction due to an enlarged band gap. Our findings set forth a possible route for tuning the stability of superionic thermoelectric materials.Thermoelectric generators produce electrical energy from a heat flux through the device. Having been proven for their reliability from stable implementations in space missions, the technology is now drawing interest for terrestrial applications. For example, using thermoelectric technology to convert waste industrial heat into electricity could deliver a significant alleviation to the energy crisis. However, wide-spread use of the technology is limited by the energy conversion efficiency, which is bottlenecked by what thermoelectric materials can offer. The maximum efficiency obtainable from a material is characterized by the figure-of-merit:where S is the Seebeck coefficient, σ is electrical conductivity, and κ is thermal conductivity. Thermoelectric materials research is thus heavily focused on the search for high zT materials. In the search for new material families for thermoelectrics, the revisit to superionic compounds as thermoelectric materials [1] has sparked great interest because of their inherently low thermal conductivity [2] which is advantageous in obtaining a high zT . In the superionic phase, cations exhibit liquid-like diffusivity [3,4] and this disordered nature typically results in a very low lattice thermal conductivity (<1 W m −1 K −1 ). Many of the superionic compounds, particularly those that are also good electric conductors, indeed show promising thermoelectric properties as exemplified by Cu 2 Se [1,5]

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confidence: 89%

Enhanced stability and thermoelectric figure-of-merit in copper selenide by lithium doping

Kang

Pöhls

Aydemir

et al. 2017

Materials Today Physics

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“…A maximum zT of 0.96 at 300 K is reported only by Ferhat and Nagao. 14 The zT values are much less than the unity in both Ag-rich and Se-rich samples by Lee et al 15 However, the zT around 1.0 in Ag 2 Se is recently predicted again by Day et al 17 using single parabolic band model calculations although it is not realized in their Ag-rich Ag 2 Se samples because the optimum carrier concentration is not reached by the excessive Ag atoms. Thus, the TE performance in Ag 2 Se is still an open question and requires further investigations.…”

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confidence: 93%

Thermoelectric transport of Se-rich Ag2Se in normal phases and phase transitions

Qiu

Zhang

et al. 2014

Applied Physics Letters

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Small amount of Se atoms are used to tune the carrier concentrations (nH) and electrical transport in Ag2Se. Significant enhancements in power factor and thermoelectric figure of merit (zT) are observed in the compositions of Ag2Se1.06 and Ag2Se1.08. The excessive Se atoms do not change the intrinsically electron-conducting character in Ag2Se. The detailed analysis reveals the experiment optimum carrier concentration in Ag2Se is around 5 × 1018 cm−3. We also investigate the temperature of maximum zT and the thermoelectric transport during the first order phase transitions using the recently developed measurement system.

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“…43,44 Binary silver chalcogenides have also been tested as thermoelectric materials, showing values of the thermoelectric figure of merit (ZT) close to unity in some cases. [45][46][47][48][49] In the context of thermoelectrics, Xiao et al have reported higher ZT values for ternary Ag 4 SeS alloyed NPs, compared to the binary Ag 2 Se NPs. 50 Other materials in the research spotlight are CuAgSe, AgSbSe 2 and AgBiSe 2 systems, which are currently emerging as promising thermoelectric materials with enhanced ionic and electronic mobilities and ultra-low thermal conductivities.…”

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confidence: 99%

Synthesis and Thermoelectric Properties of Noble Metal Ternary Chalcogenide Systems of Ag–Au–Se in the Forms of Alloyed Nanoparticles and Colloidal Nanoheterostructures

Dalmases¹,

Ibáñez

Torruella³

et al. 2016

Chem. Mater.

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ABSTRACT:The optimization of a material functionality requires both the rational design and precise engineering of its structural and chemical parameters. In this work, we show how colloidal chemistry is an excellent synthetic choice for the synthesis of novel ternary nanostructured chalcogenides, containing exclusively noble metals, with tailored morphology and composition and with potential application in the energy conversion field. Specifically, the Ag-Au-Se system has been explored from a synthetic point of view, leading to a set of Ag 2 Se-based hybrid and ternary nanoparticles, including the room temperature synthesis of the rare ternary Ag 3 AuSe 2 fischesserite phase. An in-depth structural and chemical characterization of all nanomaterials has been performed, which proofed especially useful for unravelling the reaction mechanism behind the formation of the ternary phase in solution. The work is complemented with the thermal and electric characterization of a ternary Ag-Au-Se nanocomposite with promising results: we found that the use of the ternary nanocomposite represents a clear improvement in terms of thermoelectric energy conversion as compared to a binary Ag-Se nanocomposite analogue.

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Evaluating the potential for high thermoelectric efficiency of silver selenide

Cited by 118 publications

References 18 publications

Enhanced stability and thermoelectric figure-of-merit in copper selenide by lithium doping

Enhanced stability and thermoelectric figure-of-merit in copper selenide by lithium doping

Thermoelectric transport of Se-rich Ag2Se in normal phases and phase transitions

Synthesis and Thermoelectric Properties of Noble Metal Ternary Chalcogenide Systems of Ag–Au–Se in the Forms of Alloyed Nanoparticles and Colloidal Nanoheterostructures

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