High thermoelectric properties achieved in environmentally friendly sulfide compound Bi2SeS2 by nanoenginnering

Li, Fu; Ruan, Min; Jabar, Bushra; Liang, Chongbin; Chen, Yuexing; Ao, Dongwei; Zheng, Zhaoke; Fan, Ping; Liu, Weishu

doi:10.1016/j.nanoen.2021.106273

“…As known, bismuth telluride (Bi 2 Te 3 ) based alloys have been investigated for over half a century, [7] as an advanced thermoelectric material with many reported breaking ZT records. [8][9][10][11] Although some new low-temperature thermoelectric materials are recently discovered, it is still challenging for them to take the dominant position of Bi 2 Te 3 based alloys in commercial applications for cooling applications and power generation. [5,[12][13][14] Besides, the majority of Bi 2 Te 3 based alloys work in a narrow temperature range, [15] typically below 423 K, due to the strong bipolar effect.…”

mentioning

confidence: 99%

Mediating Point Defects Endows n‐Type Bi₂Te₃ with High Thermoelectric Performance and Superior Mechanical Robustness for Power Generation Application

Zhu

¹

,

Sun

²

,

Zhu

³

et al. 2022

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Bi2Te3‐related alloys dominate the commercial thermoelectric market, but the layered crystal structure leads to the dissociation and intrinsic brittle fracture, especially for single crystals that may worsen the practical efficiency. In this work, point defect configuration by S/Te/I defects engineering is engaged to boost thermoelectric and mechanical properties of n‐type Bi2Te3 alloy, which, coupled with p‐type BiSbTe, shows a competitive conversion efficiency for the fabricated module. First, as S alloying suppresses the intrinsic BiTe, antisite defects and forms a donor‐like effect, electronic transport properties are optimized, associated with the decreased thermal conductivity due to the point defect scattering. The periodide compound TeI4 is afterward adopted to further tune carrier concentration for the realization of an optimal ZT. Finally, an advanced average ZT of 1.05 with ultra‐high compressive strength of 230 MPa is achieved for Bi2Te2.9S0.1(TeI4)0.0012. Based on this optimum composition, a fabricated 17‐pair module demonstrates a maximum conversion efficiency of 5.37% under the temperature difference of 250 K, rivaling the current state‐of‐the‐art Bi2Te3 modules. This work reveals the novel mechanism of point defect reconfiguration in synergistic enhancement of thermoelectric and mechanical properties for durably commercial application, which may be applicable to other thermoelectric systems.

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“… a) zT of Cu 2− x S‐base thermoelectric materials [15, 22, 26, 27, 47–52] and b) the comparison with other metal sulfide compounds taken from the literature [53–60] …”

Section: Resultsmentioning

confidence: 99%

RealizingzT>2 in Environment‐Friendly Monoclinic Cu₂S—Tetragonal Cu_1.96S Nano‐Phase Junctions for Thermoelectrics

Li

¹

,

Lou

²

,

Jin

³

et al. 2022

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Phase‐junction nanocomposites, made of nanograins with the same composition but different phases, offer a platform to optimize the physiochemical performance of materials. Herein, we demonstrate a straightforward strategy to synthesize Cu2−xS phase‐junction nanocomposites by retaining surface 1‐dodecanethiol (DDT) ligands, in contrast to the traditional method that strips the ligands. As a result, phase junctions between a conventional monoclinic (m) phase and an unconventional metastable tetragonal (t) phase are obtained. The significantly improved power factor is obtained due to the doping of the t‐phase. The phase‐junction interfaces reduce thermal conductivity. Finally, surface regulation of phase junctions pushes the peak zT to 2.1 at 932 K, being the highest reported for environment‐friendly metal sulfides. This work provides a paradigm to optimize thermoelectric performance by controlling phase junctions through surface‐ligand tuning.

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“…[15,22,26,27,[47][48][49][50][51][52] and b) the comparison with other metal sulfide compounds taken from the literature. [53][54][55][56][57][58][59][60]…”

Section: Conflict Of Interestmentioning

confidence: 99%

RealizingzT>2 in Environment‐Friendly Monoclinic Cu₂S—Tetragonal Cu_1.96S Nano‐Phase Junctions for Thermoelectrics

Li

¹

,

Lou

²

,

Jin

³

et al. 2022

View full text Add to dashboard Cite

Phase‐junction nanocomposites, made of nanograins with the same composition but different phases, offer a platform to optimize the physiochemical performance of materials. Herein, we demonstrate a straightforward strategy to synthesize Cu2−xS phase‐junction nanocomposites by retaining surface 1‐dodecanethiol (DDT) ligands, in contrast to the traditional method that strips the ligands. As a result, phase junctions between a conventional monoclinic (m) phase and an unconventional metastable tetragonal (t) phase are obtained. The significantly improved power factor is obtained due to the doping of the t‐phase. The phase‐junction interfaces reduce thermal conductivity. Finally, surface regulation of phase junctions pushes the peak zT to 2.1 at 932 K, being the highest reported for environment‐friendly metal sulfides. This work provides a paradigm to optimize thermoelectric performance by controlling phase junctions through surface‐ligand tuning.

show abstract

High thermoelectric properties achieved in environmentally friendly sulfide compound Bi2SeS2 by nanoenginnering

Cited by 23 publications

References 53 publications

Mediating Point Defects Endows n‐Type Bi₂Te₃ with High Thermoelectric Performance and Superior Mechanical Robustness for Power Generation Application

Mediating Point Defects Endows n‐Type Bi₂Te₃ with High Thermoelectric Performance and Superior Mechanical Robustness for Power Generation Application

RealizingzT>2 in Environment‐Friendly Monoclinic Cu₂S—Tetragonal Cu_1.96S Nano‐Phase Junctions for Thermoelectrics

RealizingzT>2 in Environment‐Friendly Monoclinic Cu₂S—Tetragonal Cu_1.96S Nano‐Phase Junctions for Thermoelectrics

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High thermoelectric properties achieved in environmentally friendly sulfide compound Bi2SeS2 by nanoenginnering

Cited by 23 publications

References 53 publications

Mediating Point Defects Endows n‐Type Bi2Te3 with High Thermoelectric Performance and Superior Mechanical Robustness for Power Generation Application

Mediating Point Defects Endows n‐Type Bi2Te3 with High Thermoelectric Performance and Superior Mechanical Robustness for Power Generation Application

RealizingzT>2 in Environment‐Friendly Monoclinic Cu2S—Tetragonal Cu1.96S Nano‐Phase Junctions for Thermoelectrics

RealizingzT>2 in Environment‐Friendly Monoclinic Cu2S—Tetragonal Cu1.96S Nano‐Phase Junctions for Thermoelectrics

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Mediating Point Defects Endows n‐Type Bi₂Te₃ with High Thermoelectric Performance and Superior Mechanical Robustness for Power Generation Application

Mediating Point Defects Endows n‐Type Bi₂Te₃ with High Thermoelectric Performance and Superior Mechanical Robustness for Power Generation Application

RealizingzT>2 in Environment‐Friendly Monoclinic Cu₂S—Tetragonal Cu_1.96S Nano‐Phase Junctions for Thermoelectrics

RealizingzT>2 in Environment‐Friendly Monoclinic Cu₂S—Tetragonal Cu_1.96S Nano‐Phase Junctions for Thermoelectrics