High‐Performance Thermoelectricity in Nanostructured Earth‐Abundant Copper Sulfides Bulk Materials

Ge, Zhen‐Hua; Liu, Xiaoye; Feng, Dan; Lin, Jingyang; He, Jiaqing

doi:10.1002/aenm.201600607

Cited by 122 publications

(93 citation statements)

References 54 publications

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“…This implies that Cu + (0.077 nm) ions are not substituted by much larger Na + (0.133 nm) ions in this experimental condition. A similar result was observed when Na was doped in a system of Cu 9 S 5 [29]. On the other hand, Na-doped Cu 2−x Se shows a peak shift in comparison with the pattern of as-synthesized Na-doped Cu 2−x Se nanoplates after the SPS process (refer to the inset 002 peaks).…”

Section: Resultssupporting

confidence: 63%

Na-Doping Effects on Thermoelectric Properties of Cu2−xSe Nanoplates

Yu¹,

Han²,

Kim

2017

Applied Sciences

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For this work, a β-phase Cu 2−x Se nanowire and nanoplate, and a Na-doped Cu 2−x Se nanoplate were successfully synthesized using solution syntheses. The morphologies of the Cu 2−x Se nanowire and nanoplate could be easily controlled by changing the synthetic condition. The Na-doped Cu 2−x Se nanoplate was prepared by a simple treatment of the Cu 2−x Se nanoplate with a sodium hydroxide-ethylene glycol solution. The nanopowders were then consolidated to bulk materials using spark plasma sintering (SPS). The phase structure and the microstructure of all of the samples were checked using X-ray diffraction (XRD), high-resolution transmission electron microscope (HR-TEM), and scanning electron microscope (SEM) analyses. The thermoelectric transport properties, such as the electrical conductivity, Seebeck coefficient, carrier concentration, carrier mobility, and thermal conductivity, were measured at temperature ranges from 323 to 673 K. The results show that Na played two important roles: one is reducing the carrier concentration, thereby improving the Seebeck coefficient, the other is reducing the thermal conductivity. Overall, the maximum thermoelectric figure of merit (ZT) of 0.24 was achieved at 673 K in the Na-doped Cu 2−x Se nanoplate.

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Section: Resultssupporting

confidence: 63%

Na-Doping Effects on Thermoelectric Properties of Cu2−xSe Nanoplates

Yu¹,

Han²,

Kim

2017

Applied Sciences

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“…Therefore, the HS-bulk sample has the lowest electrical conductivity. The WCM-bulk sample has one turning point in the σ curve due to the one phase transition of Cu 1.8 S during the measured temperature range of 323 K to 773 K [34]. Two turning points in the σ curve were observed for the HS-bulk sample due to the two phase transitions of Cu 2 S during the measured temperature range.…”

Section: Thermoelectric Transport Propertiesmentioning

confidence: 82%

“…The TE properties of Cu1.8S bulk sample in the literature [34], which were prepared by the same SPS process but using the mechanical alloying (MA) treated powders, are shown for comparison. Figure 6a illustrates the temperature dependence of electrical conductivity (σ) for the bulk samples.…”

Section: Thermoelectric Transport Propertiesmentioning

confidence: 99%

“…According to the equations σ = eµn, and α ≈ γ − lnn, [37] where σ, µ, n, α and γ are electrical conductivity, carrier mobility, carrier concentration, Seebeck coefficient and scattering factor, respectively, α is usually inversely proportional to σ. The HS-bulk achieved the largest α value of 532 µVK −1 at 673 K. The WCM-bulk achieved the largest α value of 101 µVK −1 at 773 K. The PF was calculated by PF = α 2 σ and is shown in Figure 6c [34]. Figure 7 shows the temperature dependence of thermal conductivity (κ) (a) and the thermoelectric figure of merit, ZT (b).…”

Section: Thermoelectric Transport Propertiesmentioning

confidence: 99%

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Synthesis and Thermoelectric Properties of Copper Sulfides via Solution Phase Methods and Spark Plasma Sintering

Tang

Feng

2017

Crystals

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Large-scale Cu 2 S tetradecahedrons microcrystals and sheet-like Cu 2 S nanocrystals were synthesized by employing a hydrothermal synthesis (HS) method and wet chemistry method (WCM), respectively. The morphology of α-Cu 2 S powders prepared by the HS method is a tetradecahedron with the size of 1-7 µm. The morphology of β-Cu 2 S is a hexagonal sheet-like structure with a thickness of 5-20 nm. The results indicate that the morphologies and phase structures of Cu 2 S are highly dependent on the reaction temperature and time, even though the precursors are the exact same. The polycrystalline copper sulfides bulk materials were obtained by densifying the as-prepared powders using the spark plasma sintering (SPS) technique. The electrical and thermal transport properties of all bulk samples were measured from 323 K to 773 K. The pure Cu 2 S bulk samples sintered by using the powders prepared via HS reached the highest thermoelectric figure of merit (ZT) value of 0.38 at 573 K. The main phase of the bulk sample sintered by using the powder prepared via WCM changed from β-Cu 2 S to Cu 1.8 S after sintering due to the instability of β-Cu 2 S during the sintering process. The Cu 1.8 S bulk sample with a Cu 1.96 S impurity achieved the highest ZT value of 0.62 at 773 K.

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“…This led to a simultaneous increase in the carrier mobility and a drastic reduction in the lattice thermal conductivity. Ge et al [93] prepared nanostructured Cu 1.8 S (Cu 9 S 5 ) by mechanical alloying. By doping Na at the interstitial sites, the carrier concentration was reduced to the optimal range, and nano pores were introduced REVIEWS .…”

Section: Liquid-like or Superionic Materialsmentioning

confidence: 99%

Copper chalcogenide thermoelectric materials

et al. 2018

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Cu-based chalcogenides have received increasing attention as promising thermoelectric materials due to their high efficiency, tunable transport properties, high elemental abundance and low toxicity. In this review, we summarize the recent research progress on this large family compounds covering diamond-like chalcogenides and liquid-like Cu 2 X (X=S, Se, Te) binary compounds as well as their multinary derivatives. These materials have the general features of two sublattices to decouple electron and phonon transport properties. On the one hand, the complex crystal structure and the disordered or even liquid-like sublattice bring about an intrinsically low lattice thermal conductivity. On the other hand, the rigid sublattice constitutes the charge-transport network, maintaining a decent electrical performance. For specific material systems, we demonstrate their unique structural features and outline the structure-performance correlation. Various design strategies including doping, alloying, band engineering and nanostructure architecture, covering nearly all the material scale, are also presented. Finally, the potential of the application of Cu-based chalcogenides as high-performance thermoelectric materials is briefly discussed from material design to device development.

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High‐Performance Thermoelectricity in Nanostructured Earth‐Abundant Copper Sulfides Bulk Materials

Cited by 122 publications

References 54 publications

Na-Doping Effects on Thermoelectric Properties of Cu2−xSe Nanoplates

Na-Doping Effects on Thermoelectric Properties of Cu2−xSe Nanoplates

Synthesis and Thermoelectric Properties of Copper Sulfides via Solution Phase Methods and Spark Plasma Sintering

Copper chalcogenide thermoelectric materials

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