Realizing high thermoelectric performance in eco-friendly Bi2S3 with nanopores and Cl-doping through shape-controlled nano precursors

Jin, Kangpeng; Tiwari, Janak; Feng, Tianli; Lou, Yue; Xu, Biao

doi:10.1016/j.nanoen.2022.107478

“…As a result, an ultra-high maximum figure-of-merit ZT max = 1.13 at 773 K (where ZT is equal to 0.21 for pristine Bi 2 S 2 Se at 773 K) with a high average figure of-merit (ZT ave ) = 0.54 (at 323-773 K) are realized, as shown in Figure 5f and Figure S17 (Supporting Information). The largest ZT obtained here is the record highest ZT reported in n-type Bi 2 S 2 Se mid-temperature range thermoelectric materials [29][30][31][32][33][34][35][36][37][38][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54] (as shown in Figure S17, Supporting Information). Figure S18 (Supporting Information) shows the reproducibility of our high-performance thermoelectric sample.…”

Section: (5 Of 11)mentioning

confidence: 83%

“…The largest PF of ≈7.18 µW cm −1 K −2 (at 773 K) is realized for Bi 2 S 2 Se 0.90 Cl 0.10 : f Sb ( f = 0.10), which the highest value than that of previously reported Bi 2 S 2 Se 1 and Bi 2 S 3 ‐based materials. [ 29–38,40–54 ]…”

Section: Resultsmentioning

confidence: 99%

Strain‐Mediated Lattice Rotation Design for Enhancing Thermoelectric Performance in Bi₂S₂Se

Mansoor

¹

,

Jabar

²

,

Li

³

et al. 2023

Adv Funct Materials

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A unique strain-mediated lattice rotation strategy is introduced via nanocompositing to upsurge the optimized limits in the composition-to-structural pathway on rationally engineering the efficient thermoelectric material. In this study, a special lattice rotation via strain engineering is realized to optimize the desired electronic and chemical environment for enhancing thermoelectric properties in n-type Bi 2 S 2 Se. This approach results in a unique transport phenomenon to assist high-energy electrons in transferring through the optimized transport channels, and appropriate structure disparity to significantly localize phonons. As a result, Sb over Cl doping in Bi 2 S 2 Se gently reduces E g and introduces defect states in bandgap with shifting down the Fermi level, thus causing increase in carrier concentration, which contributes to a higher power factor of ≈7.18 µW cm −1 K −2 (at T = 773 K). Besides, a lower thermal conductivity of ≈0.49 W m −1 K −1 is driven through lattice strain and defect engineering. Consequently, an ultra-high ZT max = 1.13 (at T = 773 K) and a high ZT ave = 0.54 (323 K-773 K) are realized. This study not only leads to an extraordinary thermoelectric performance but also reveals a unique paradigm for electron transportation and phonon localization via lattice strain engineering.

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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

Self Cite

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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

Self Cite

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

Realizing high thermoelectric performance in eco-friendly Bi2S3 with nanopores and Cl-doping through shape-controlled nano precursors

Cited by 32 publications

References 77 publications

Strain‐Mediated Lattice Rotation Design for Enhancing Thermoelectric Performance in Bi₂S₂Se

Strain‐Mediated Lattice Rotation Design for Enhancing Thermoelectric Performance in Bi₂S₂Se

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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Realizing high thermoelectric performance in eco-friendly Bi2S3 with nanopores and Cl-doping through shape-controlled nano precursors

Cited by 32 publications

References 77 publications

Strain‐Mediated Lattice Rotation Design for Enhancing Thermoelectric Performance in Bi2S2Se

Strain‐Mediated Lattice Rotation Design for Enhancing Thermoelectric Performance in Bi2S2Se

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

Contact Info

Product

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About

Strain‐Mediated Lattice Rotation Design for Enhancing Thermoelectric Performance in Bi₂S₂Se

Strain‐Mediated Lattice Rotation Design for Enhancing Thermoelectric Performance in Bi₂S₂Se

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