Thermoelectric Properties of Thiospinel-Type CuCo2S4

Lang, Yudong; Pan, Lin; Chen, Changchun; Wang, Yifeng

doi:10.1007/s11664-019-07182-x

Cited by 26 publications

(19 citation statements)

References 58 publications

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“…The spinel structure is known to be flexible and allows an accommodation of 1) a variety of metallic elements with different atomic size and mass, 2) ordered or disordered arrangement of cations (so‐called normal, inverse, or intermediate structures), and 3) partially occupied crystallographic positions. All these result in a diversity of magnetic, optical, catalytic, electrical, as well as thermoelectric (TE) properties . Many spinels consisting of well‐abundant and environmental‐friendly elements (which is crucial for a possible thermoelectric application) became the object of numerous studies.…”

Section: Introductionmentioning

confidence: 99%

Structural Peculiarities and Thermoelectric Study of Iron Indium Thiospinel

Wyżga

Veremchuk²,

Bobnar³

et al. 2020

Chemistry A European J

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The homogeneity range of ternary iron indium thiospinela t8 73 Kw as investigated. Ad etailed study was focused on two distinct series (y = z): 1) ap reviously reported charge-balanced (In 0.67 + 0.33y & 0.33À0.33y ) tetr [In 2Àz Fe z ] oct S 4 (A1series; & stands for vacancy;t he abbreviations "tetr" and "oct" indicate atoms occupying tetrahedral 8a and octahedral 16d sites, respectively)a nd 2) an ew charge-unbalanced (In 0.67 + y & 0.33Ày ) tetr [In 2Àz Fe z ] oct S 4 (A2-series). Fe atoms were confirmed to exclusively occupy an octahedral positioni nb oth series. An unusualr eduction of the unit cell parameter with increasing Fe contenti se xplained by differences in the ionic radii between Fe and In, as well as by an additional electrostatic attraction originating from charge imbalance( latter only in A2-series). The studiedc ompound is an n-type semiconductor,a nd its charge carrier concentration increases or decreases for larger Fe content withint he A1-and A2-series, respectively.T he thermal conductivity k tot is significantly reducedu pon increasing vacancy concentration, whereas the changeo fp ower factor is insufficientt od rastically improve the thermoelectric figure of merit.

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Section: Introductionmentioning

confidence: 99%

Structural Peculiarities and Thermoelectric Study of Iron Indium Thiospinel

Wyżga

Veremchuk²,

Bobnar³

et al. 2020

Chemistry A European J

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“…What makes sulfides perspective candidates for TE applications is the high abundance and low (if any) toxicity of the constituent elements in comparison to Bi 2 Te 3 and PbTe. Besides intensively studied tetrahedrites, chalcosite or colusites, there is an increasing interest in electronic and thermal transport properties of AB 2 S 4 thiospinels . The reason for that is the ability of the spinel‐type structure to accommodate different metal elements,, which results in tunability of physical properties e.g., from insulator to metal .…”

Section: Introductionmentioning

confidence: 99%

Ternary MIn₂S₄ (M = Mn, Fe, Co, Ni) Thiospinels – Crystal Structure and Thermoelectric Properties

Wyżga

Veremchuk²,

Bobnar³

et al. 2020

Zeitschrift anorg allge chemie

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A combined structural, magnetic and thermoelectric study of polycrystalline ternary MIn2S4 (M = Mn, Fe, Co, Ni) thiospinels is presented. All compounds crystallize with MgAl2O4‐type structure. Rietveld refinement analysis confirmed that the preferred crystallographic position of transition metal element changes from mainly tetrahedral 8a for Mn to exclusively octahedral 16d for Ni (i.e. increase of the inversion parameter). Magnetic susceptibility measurements revealed M‐elements to possess 2+ oxidation state in MIn2S4. All these compounds order antiferromagnetically with Néel temperatures TN ranging from 5–13 K. The studied thiospinels are n‐type semiconductors with large values of electrical resistivity ρ > 0.6 Ω·m at room temperature. An increase of the inversion parameter leads to a reduction of the determined activation energies, as well as to a more disorder‐like behavior of thermal conductivity. The highest thermoelectric Figure of merit ZT was observed for MIn2S4 with M = Fe, Ni, which adopt inverse spinel structure.

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“…[70][71][72] In CuCo 2 S 4 , the dominant charge carriers are holes. [45,54] These can possibly be excited by plasmon resonance and injected as ′ hot holes' into neighboring materials. But TiO 2 is an electron acceptor and acts as a hole donor.…”

Section: Samplementioning

confidence: 99%

“…[44,50] We are aware that in several contributions CuCo 2 S 4 was identified as a semiconductor with band-gaps of 2.24 eV, [51] 1.01-1.4 eV [52] or 1.41 eV. [53] The high electrical conductivity [44,46,54] is beneficial for a good and fast electron transfer to surface sites, being able to use excited electrons for catalytic reactions. In some studies, CuCo 2 S 4 showed excellent activity for electrochemical HER and OER making it a bifunctional catalyst for water splitting and a very interesting material for further investigations.…”

Section: Introductionmentioning

confidence: 99%

CuCo₂S₄Deposited on TiO₂: Controlling the pH Value Boosts Photocatalytic Hydrogen Evolution

et al. 2020

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Metallic spinel-type CuCo 2 S 4 nanoparticles were deposited on nanocrystalline TiO 2 (P25®), forming heterostructure nanocomposites. The nanocomposites were characterized in detail by X-ray powder diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), nitrogen sorption (BET) and UV/Vis spectroscopy. Variation of the CuCo 2 S 4 :TiO 2 ratio to an optimum value generated a catalyst which shows a very

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Thermoelectric Properties of Thiospinel-Type CuCo2S4

Cited by 26 publications

References 58 publications

Structural Peculiarities and Thermoelectric Study of Iron Indium Thiospinel

Structural Peculiarities and Thermoelectric Study of Iron Indium Thiospinel

Ternary MIn₂S₄ (M = Mn, Fe, Co, Ni) Thiospinels – Crystal Structure and Thermoelectric Properties

CuCo₂S₄Deposited on TiO₂: Controlling the pH Value Boosts Photocatalytic Hydrogen Evolution

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Thermoelectric Properties of Thiospinel-Type CuCo2S4

Cited by 26 publications

References 58 publications

Structural Peculiarities and Thermoelectric Study of Iron Indium Thiospinel

Structural Peculiarities and Thermoelectric Study of Iron Indium Thiospinel

Ternary MIn2S4 (M = Mn, Fe, Co, Ni) Thiospinels – Crystal Structure and Thermoelectric Properties

CuCo2S4Deposited on TiO2: Controlling the pH Value Boosts Photocatalytic Hydrogen Evolution

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Product

Resources

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Ternary MIn₂S₄ (M = Mn, Fe, Co, Ni) Thiospinels – Crystal Structure and Thermoelectric Properties

CuCo₂S₄Deposited on TiO₂: Controlling the pH Value Boosts Photocatalytic Hydrogen Evolution