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

Mi, Wenlong; Qiu, Pengfei; Zhang, Tiansong; Lv, Yanhong; Chen, Lidong

doi:10.1063/1.4870509

Cited by 146 publications

(169 citation statements)

References 24 publications

(50 reference statements)

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“…are observed, respectively, which are consistent with reports in the literature. [77][78] The Cp curves of the Bi2Se3 and SnSe samples show a dropping trend beyond 300 °C, which may be caused by the volatilization of the sample arising from instability above this temperature. pellet gradually increases with increasing temperature and reaches 0.45 at 450 °C, which is slightly lower than that of the corresponding bulk sample, as shown in Figure 8(c).…”

Section: Resultsmentioning

confidence: 99%

Robust scalable synthesis of surfactant-free thermoelectric metal chalcogenide nanostructures

Han

et al. 2015

Nano Energy

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, S. Xue. (2015). Robust scalable synthesis of surfactant-free thermoelectric metal chalcogenide nanostructures. Nano Energy, Robust scalable synthesis of surfactant-free thermoelectric metal chalcogenide nanostructures AbstractA robust low-cost ambient aqueous method for the scalable synthesis of surfactant-free nanostructured metal chalcogenides (MaXb, M=Cu, Ag, Sn, Pb, and Bi; X=S, Se, and Te; a=1 or 2; and b=1 or 3) is developed in this work. The effects of reaction parameters, such as precursor concentration, ratio of precursors, and amount of reducing agent, on the composition, size, and shape of the resultant nanostructures have been comprehensively investigated. This environmentally friendly approach is capable of producing metal chalcogenide nanostructures in a one-pot reaction on a large scale, which were investigated for their thermoelectric properties towards conversion of waste heat into electricity. The results demonstrate that the thermoelectric properties of these metal chalcogenide nanostructures are strongly dependent on the types of metal chalcogenides, and their figure of merits are comparable with previously reported figures for their bulk or nanostructured counterparts.

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Section: Resultsmentioning

confidence: 99%

Robust scalable synthesis of surfactant-free thermoelectric metal chalcogenide nanostructures

Han

et al. 2015

Nano Energy

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“…changing from orthorhombic CuAgSe into cubic CuAgSe), which has been demonstrated in previous reports. [27][28] Like other Cu and Ag based PLEC materials with phase transition, [16][17] the temperature dependences of the electrical conductivity, Seebeck coefficient, thermal conductivity, and specific heat of CuAgSe show an interesting transition accompanied by its phase transition. As presented in Figure 1(c), the high-temperature cubic phase is composed of a facecentered-cubic Se lattice with Ag/Cu cations that are randomly distributed among the tetrahedral sites.…”

Section: -21mentioning

confidence: 99%

“…The valley-like ZT profiles suggest the minimum value near the phase transition temperature (467 K), and it drastically increased from 0.1 at 470 K to 0.8 at 500 K. This anomalous behavior is consistent with previous reports on thermoelectric materials with phase transition. [16][17] To further understand the n-p transition of electrical conductivity, the electronic structures of tetragonal and cubic CuAgSe were calculated. Figure 8(a) illustrates the calculated band structure of tetragonal CuAgSe at the PBE level.…”

Section: -21mentioning

confidence: 99%

“…12 Another good example of PLEC material is nonstoichiometric copper sulfide Cu 1.97 S, which has the maximum ZT of 1.7 at 1000 K accompanied with an obvious phase transition from low chalcocite phase to PLEC state at around 400 K. 15 Besides copper chalcogenides, silver chalcogenides experienced similar phase transition and anomalous TE performance was also observed. 16 Although the phase transition related transports are common in PLEC materials, its mechanism was rarely studied. 12,[15][16][17] The high ZT of the PLEC has motivated substantial efforts in searching for high performance thermoelectric materials with a similar superionic structure.…”

Section: Introductionmentioning

confidence: 99%

“…16 Although the phase transition related transports are common in PLEC materials, its mechanism was rarely studied. 12,[15][16][17] The high ZT of the PLEC has motivated substantial efforts in searching for high performance thermoelectric materials with a similar superionic structure. As an important ternary selenide, CuAgSe is such a candidate with the superionic property due to the mobility of both Cu + and Ag + ions at high temperature.…”

Section: Introductionmentioning

confidence: 99%

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Ambient Scalable Synthesis of Surfactant-Free Thermoelectric CuAgSe Nanoparticles with Reversible Metallic-n-p Conductivity Transition

et al. 2014

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Surfactant-free CuAgSe nanoparticles were successfully synthesized on a large scale within a short reaction time via a simple environmentally friendly aqueous approach under room temperature. The nanopowders obtained were consolidated into pellets for investigation of their thermoelectric properties between 3 and 623 K. The pellets show strong metallic characteristics below 60 K and turn into an n-type semiconductor with increasing temperature, accompanied by changes in the crystal structure (i.e., from the pure tetragonal phase into a mixture of tetragonal and orthorhombic phases), the electrical conductivity, the Seebeck coefficient, and the thermal conductivity, which leads to a figure of merit (ZT) of 0.42 at 323 K. The pellets show further interesting temperature-dependent transition from n-type into p-type in electrical conductivity arising from phase transition (i.e., from the mixture phases into cubic phase), evidenced by the change of the Seebeck coefficient from -28 μV/K into 226 μV/K at 467 K. The ZT value increased with increasing temperature after the phase transition and reached 0.9 at 623 K. The sintered CuAgSe pellets also display excellent stability, and there is no obvious change observed after 5 cycles of consecutive measurements. Our results demonstrate the potential of CuAgSe to simultaneously serve (at different temperatures) as both an n-type and a p-type thermoelectric material.Keywords surfactant, free, thermoelectric, cuagse, nanoparticles, synthesis, reversible, ambient, metallic, n, p, conductivity, transition, scalable Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsHan, C., Sun, Q., Cheng, Z. Xiang., Wang, J. Li., Li, Z., Lu, G. & Dou, S. Xue. (2014 Supporting Information PlaceholderABSTRACT: Surfactant-free CuAgSe nanoparticles were successfully synthesized on a large scale within a short reaction time via a simple environmentally friendly aqueous approach under room temperature. The nanopowders obtained were consolidated into pellets for investigation of their thermoelectric properties between 3 K and 623 K. The pellets show strong metallic characteristics below 60 K and turn into an n-type semiconductor with increasing temperature, accompanied by changes in the crystal structure (i.e. from the pure tetragonal phase into a mixture of tetragonal and orthorhombic phases), the electrical conductivity, the Seebeck coefficient, and the thermal conductivity, which leads to a figure of merit (ZT) of 0.42 at 323 K. The pellets show further interesting temperature-dependent transition from n-type into p-type in electrical conductivity arising from phase transition (i.e. from the mixture phases into cubic phase), evidenced by the change of the Seebeck coefficient from -28 µV/K into 226 µV/K at 467 K. The ZT value increased with increasing temperature after the phase transition and reached 0.9 at 623 K. The sintered CuAgSe pellets also display excellent stability, and there is no obvious change observed after 5 cycles of consecutive measurements. Our r...

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Recent Advances in Liquid‐Like Thermoelectric Materials

Zhao

Qiu

Shi

et al. 2019

Adv Funct Materials

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Thermoelectric technology has attracted great attention due to its ability to recover and convert waste heat into readily available electric energy. Among the various candidate materials, liquid‐like compounds have received tremendous research interest on account of their intrinsically ultralow lattice thermal conductivity, tunable electrical properties, and high thermoelectric performance. Despite their complex phase transitions and diverse crystal structures, liquid‐like materials have two independent sublattices in common: one rigid sublattice formed by immobile ions for the free transport of electrons and one liquid‐like sublattice consisting of highly mobile ions to interrupt the thermal transports. This review first outlines the common structural features of liquid‐like thermoelectrics, along with their unusual electron and phonon transport behaviors that well satisfy the concept of “phonon‐liquid electron‐crystal.” Next, some commonly adopted strategies for further improving their thermoelectric performance are highlighted. The main progress achieved in the typical liquid‐like TE materials is then summarized, with an emphasis on their diverse crystal structures, common characteristics, and unique transport properties. The recent understandings on the stability issue of liquid‐like TE materials are also introduced. Finally, an outlook is given for the liquid‐like materials with the aim to boost further development in this exciting scientific subfield.

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

Cited by 146 publications

References 24 publications

Robust scalable synthesis of surfactant-free thermoelectric metal chalcogenide nanostructures

Robust scalable synthesis of surfactant-free thermoelectric metal chalcogenide nanostructures

Ambient Scalable Synthesis of Surfactant-Free Thermoelectric CuAgSe Nanoparticles with Reversible Metallic-n-p Conductivity Transition

Recent Advances in Liquid‐Like Thermoelectric Materials

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