Thermoelectric performance enhancement of Cu<sub>2</sub>S by Se doping leading to a simultaneous power factor increase and thermal conductivity reduction

Yao, Yao; Zhang, Bo‐Ping; Pei, Jun; Liu, Yaochun; Li, Jing‐Feng

doi:10.1039/c7tc01937h

Cited by 80 publications

(59 citation statements)

References 47 publications

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“…The marked diffraction peaks can be indexed to the (101), (102), (103), (110), (108), and (116) diffraction planes, respectively. However, there is a progressive shift to lower 2θ angle at higher Se contents (Figure S1, Supporting Information), indicative of enlarged lattice spacing of CuS 1− x Se x nanosheet caused by heavy Se atoms (1.98 Å) substitution for S atoms (1.84 Å) . As shown in Figure b, the peak appearing at about 475 cm −1 in the spectrum of CuS nanosheet match well with the reported Raman spectrum of CuS crystal, which can be attributed to the stretching mode of the S‐S bond .…”

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confidence: 81%

Anionic Se‐Substitution toward High‐Performance CuS₁₋_xSe_x Nanosheet Cathode for Rechargeable Magnesium Batteries

Wang

Zhu

Chen

et al. 2019

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host materials, including metal oxides (V 2 O 5 , [2] VO x , [3] MnO 2 , [4] and MoO 3 [5] ), metal sulfides (Mo 6 S 8 , [6] MoS 2 , [7] Ti 2 S 4 , [8] α-Ag 2 S, [9] VS 4 , [10] and VS 2 [11] ), metal selenides (Mo 6 Se 8 , [12] TiSe 2 , [13] Cu 2 Se, [14] and Ni 0.75 Fe 0.25 Se 2 [15] ), have been proposed as possible cathode candidates. In particular, copper sulfide (CuS) has recently attracted great attention because of its unique properties of nontoxicity, eco-friendliness, low cost, and high theoretical specific capacity (560 mAh g −1 ). [16] Nevertheless, CuS cathode materials are still subject to a series of unsatisfactory performances related to reversible capacity, rate capability, and cycling stability caused by the serious polarization from divalent Mg 2+ . [17] Thus, the development of suitable host materials with fast reaction kinetics is highly desired but still challenging. To solve the aforementioned issues, many strategies have been proposed and brought considerable achievement in CuS cathode materials, including: i) increased ionic diffusion kinetics through elevating working temperature, [16] ii) enhanced Mg 2+ mobility by adjusting electrode-electrolyte interface, [18] and iii) shortened Mg 2+ diffusion length via constructing suitable nanoarchitectures. [19] However, the electron and solid-state Mg 2+ transport kinetics of the most reported CuS cathode materials are still unsatisfactory. It is therefore a great challenge to effectively design CuS cathode materials with high practical capacity and long cycling life, especially at high current densities. In our previous work, [19a] although the hierarchical CuS nanosheet showed good cycling performances for rMBs (135 mAh g −1 at 200 mA g −1 upon 200 cycles), its rate capability still needs to be further improved. Heavy heteroatom substitution in transition metal sulfides is expected as an efficient route to regulate their atomic structure for providing optimized configuration for Mg 2+ uptake. [20] In particular, the fractional anionic Se-substitution to S could enlarge the Mg 2+ diffusion path and reduce their interaction with the based lattice, thereby cutting down the ionic diffusion barrier and resulting much better kinetics. [21] Till now, despite the well-known Chevrel phase Mo 6 S 8−X Se X (X = 0, 1, 2), [12,21a,22] Se-substituted copper sulfide cathode materials for rMBs have been rarely reported.Herein, we develop an efficient synthesis strategy to prepare 2D anionic Se-substituted CuS 1−x Se x nanosheets with about Rechargeable magnesium batteries (rMBs) are promising as the most ideal further energy storage systems but lack competent cathode materials due to sluggish redox reaction kinetics. Herein, developed is an anionic Sesubstitution strategy to improve the rate capability and the cycling stability of 2D CuS 1−x Se x nanosheet cathodes through an efficient microwave-induced heating method. The optimized CuS 1−x Se x (X = 0.2) nanosheet cathode can exhibit high reversible capacity of 268.5 mAh g −1 at 20 mA g −1 and good cycli...

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confidence: 81%

Anionic Se‐Substitution toward High‐Performance CuS₁₋_xSe_x Nanosheet Cathode for Rechargeable Magnesium Batteries

Wang

Zhu

Chen

et al. 2019

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“…Currently, Tak et al found that introducing additional Cu into Cu 2 Se can reduce the room‐temperature m * of β‐Cu 2 Se. Meanwhile, introducing additional SiC, Ag‐doping in Cu 2 Se and Se‐doping in Cu 2 S can increase room‐temperature m *.…”

Section: Strategies For the Thermoelectric Property Enhancementmentioning

confidence: 99%

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

et al. 2020

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Due to the nature of their liquid‐like behavior and high dimensionless figure of merit, Cu2X (X = Te, Se, and S)‐based thermoelectric materials have attracted extensive attention. The superionicity and Cu disorder at the high temperature can dramatically affect the electronic structure of Cu2X and in turn result in temperature‐dependent carrier‐transport properties. Here, the effective strategies in enhancing the thermoelectric performance of Cu2X‐based thermoelectric materials are summarized, in which the proper optimization of carrier concentration and minimization of the lattice thermal conductivity are the main focus. Then, the stabilities, mechanical properties, and module assembly of Cu2X‐based thermoelectric materials are investigated. Finally, the future directions for further improving the energy conversion efficiency of Cu2X‐based thermoelectric materials are highlighted.

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“…16 Many fabrication techniques have been studied since Cu 2 S was discovered to be a highly efficient thermoelectric material, including melt-solidication, 17 mechanochemical synthesis, 18 ultrasonication and pressing, 19 chemical synthesis and hot pressing, 20 hydrothermal synthesis and hot pressing, 21 hydrothermal synthesis and mechanical alloying followed by spark plasma sintering, 22 mechanical alloying followed by spark plasma sintering, 23 and mechanical alloying with Se doping followed by spark plasma sintering. 24 These techniques however, require high pressure, high temperature and lengthy fabrication times which all contribute to the embodied energy of the material. In contrast, printing can be achieved at ambient temperature and pressure and with fast fabrication times.…”

Section: Introductionmentioning

confidence: 99%

Earth abundant, non-toxic, 3D printed Cu_2−xS with high thermoelectric figure of merit

et al. 2019

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Thermoelectric performance enhancement of Cu₂S by Se doping leading to a simultaneous power factor increase and thermal conductivity reduction

Cited by 80 publications

References 47 publications

Anionic Se‐Substitution toward High‐Performance CuS₁₋_xSe_x Nanosheet Cathode for Rechargeable Magnesium Batteries

Anionic Se‐Substitution toward High‐Performance CuS₁₋_xSe_x Nanosheet Cathode for Rechargeable Magnesium Batteries

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

Earth abundant, non-toxic, 3D printed Cu_2−xS with high thermoelectric figure of merit

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Thermoelectric performance enhancement of Cu2S by Se doping leading to a simultaneous power factor increase and thermal conductivity reduction

Cited by 80 publications

References 47 publications

Anionic Se‐Substitution toward High‐Performance CuS1−xSex Nanosheet Cathode for Rechargeable Magnesium Batteries

Anionic Se‐Substitution toward High‐Performance CuS1−xSex Nanosheet Cathode for Rechargeable Magnesium Batteries

Promising and Eco‐Friendly Cu2X‐Based Thermoelectric Materials: Progress and Applications

Earth abundant, non-toxic, 3D printed Cu2−xS with high thermoelectric figure of merit

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Thermoelectric performance enhancement of Cu₂S by Se doping leading to a simultaneous power factor increase and thermal conductivity reduction

Anionic Se‐Substitution toward High‐Performance CuS₁₋_xSe_x Nanosheet Cathode for Rechargeable Magnesium Batteries

Anionic Se‐Substitution toward High‐Performance CuS₁₋_xSe_x Nanosheet Cathode for Rechargeable Magnesium Batteries

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

Earth abundant, non-toxic, 3D printed Cu_2−xS with high thermoelectric figure of merit