Achievement of extra-high thermoelectric performance in doped copper (I) sulfide

Nkemeni, Darrin Sime; Yang, Zhe; Lou, Shiyun; Li, Guihui; Zhou, Shu

doi:10.1016/j.jallcom.2021.160128

“…Figure 2a shows the XPS survey spectra of the Cu 2−x Mn 0.05 S film; the signals of Cu, S, Mn, and C are detected. Two strong peaks at 932.6 eV (Cu 2p 3/2 ) and 952.4 eV (Cu 2p 1/2 ) (see Figure 2b) correspond to Cu + [39]. The weak split peaks at about 933.8 and 954.0 eV are attributed to Cu 2+ , and the two satellite peaks located at 944.0 and 962.5 eV also correspond to Cu 2+ [27,35], which proves the existence of Cu 1.96 S [40,41].…”

Section: Resultsmentioning

confidence: 99%

Largely Enhanced Thermoelectric Power Factor of Flexible Cu2−xS Film by Doping Mn

Zuo,

Han,

Lu

et al. 2023

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Copper-sulfide-based materials have attracted noteworthy attention as thermoelectric materials due to rich elemental reserves, non-toxicity, low thermal conductivity, and adjustable electrical properties. However, research on the flexible thermoelectrics of copper sulfide has not yet been reported. In this work, we developed a facile method to prepare flexible Mn-doped Cu2−xS films on nylon membranes. First, nano to submicron powders with nominal compositions of Cu2−xMnyS (y = 0, 0.01, 0.03, 0.05, 0.07) were synthesized by a hydrothermal method. Then, the powders were vacuum-filtrated on nylon membranes and finally hot-pressed. Phase composition and microstructure analysis revealed that the films contained both Cu2S and Cu1.96S, and the size of the grains was ~20–300 nm. By Mn doping, there was an increase in carrier concentration and mobility, and ultimately, the electrical properties of Cu2−xS were improved. Eventually, the Cu2−xMn0.05S film showed a maximum power factor of 113.3 μW m−1 K−2 and good flexibility at room temperature. Moreover, an assembled four-leg flexible thermoelectric generator produced a maximum power of 249.48 nW (corresponding power density ~1.23 W m−2) at a temperature difference of 30.1 K, and had good potential for powering low-power-consumption wearable electronics.

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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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“…The authors declare no conflict of interest. [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.

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Achievement of extra-high thermoelectric performance in doped copper (I) sulfide

Cited by 14 publications

References 67 publications

Largely Enhanced Thermoelectric Power Factor of Flexible Cu2−xS Film by Doping Mn

Largely Enhanced Thermoelectric Power Factor of Flexible Cu2−xS Film by Doping Mn

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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Achievement of extra-high thermoelectric performance in doped copper (I) sulfide

Cited by 14 publications

References 67 publications

Largely Enhanced Thermoelectric Power Factor of Flexible Cu2−xS Film by Doping Mn

Largely Enhanced Thermoelectric Power Factor of Flexible Cu2−xS Film by Doping Mn

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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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