Tailoring the thermoelectric and structural properties of Cu–Sn based thiospinel compounds [CuM1+xSn1−xS4 (M = Ti, V, Cr, Co)]

Bourgès, Cédric; Srinivasan, Bhuvanesh; Fontaine, Bruno La; Sauerschnig, Philipp; Minard, Alizée; Halet, J.‐F.; Miyazaki, Yasumitsu; Berthebaud, David; Mori, Takao

doi:10.1039/d0tc04393a

Cited by 25 publications

(31 citation statements)

References 92 publications

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“…The highest enhancement was 1275% for the milled K-CNT, with a mass fraction of 0.1% at 25 °C. It can be deduced that the improvement of the dispersion characteristics and the increase in the electrical conductivity are attributable to the increase of the surface area and electrophoretic mobility of the particles [ 63 , 64 , 65 ].…”

Section: Resultsmentioning

confidence: 99%

Effects of Functionalization in Different Conditions and Ball Milling on the Dispersion and Thermal and Electrical Conductivity of MWCNTs in Aqueous Solution

et al. 2021

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In this work, the effects of a functionalization method involving different conditions and milling processes on the dispersion and thermal and electrical conductivity of multiwalled carbon nanotubes were studied. The surfaces of MWCNTs were modified using a mixture of sulfuric and nitric acid as an acid treatment and potassium persulfate and sodium hydroxide as an alkaline treatment to achieve more hydrophilic MWCNTs. The morphological and structural investigations were carried out using transmission electron microscopy and Fourier transform infrared spectroscopy. Furthermore, the dispersion characteristics and thermal and electrical conductivity of the as-prepared water-based nanofluids were measured. As a result, the dispersion characteristics revealed that the best dispersion and stability results were obtained for alkaline-treated MWCNTs using potassium persulfate and sodium hydroxide. The thermophysical study using a thermal conductivity analyzer exhibited that the thermal conductivity of the pristine MWCNT nanofluid (0.1 wt%) was enhanced from 603.5 to 610.4 mW/m·K and the electrical conductivity of the raw MWCNT nanofluid was increased from 16.2 to 125.8 μS/cm at 25 °C after alkaline treatment and milling processes, which were performed using planetary ball milling. Regarding the overall results, the milling process and mild alkaline oxidation process are more environmentally friendly, effective, and convenient for the functionalization of CNTs, without requiring any organic solvents or strong acids.

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Section: Resultsmentioning

confidence: 99%

Effects of Functionalization in Different Conditions and Ball Milling on the Dispersion and Thermal and Electrical Conductivity of MWCNTs in Aqueous Solution

et al. 2021

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“…In particular, from the viewpoint of scalable commercial application, intensive efforts have been made in research of TE materials beyond the currently most-widely used heavy alloys, such as compounds of Te, Bi, Pb and etc., most of which are naturally scarce and/or toxic. Thus, a multitude of environmentally friendly thermoelectric sulphides has been reported, such as chalcopyrite CuFeS 2 [7,8], tetrahedrite [9,10], paracostibite CoSbS [11,12] and thiospinels [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Enhanced thermoelectric performance in polymorphic heavily Co-doped Cu₂SnS₃ through carrier compensation by Sb substitution

Zhao

Zhang

et al. 2021

Science and Technology of Advanced Materials

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“…As a result, a high average zT of 1.5 between 400–800 K with a peak zT of 2.0 at 773 K is achieved. Such a high performance is credited to the efficacy of the doping strategies as well as the use of spark plasma sintering as the processing method, which generally result in higher zT than hot press [80–84] . Lastly, the quality factor B analysis indicates that by further optimizing the carrier concentration, the zT in this cubic GeTe can be improved to beyond 2.…”

Section: Introductionmentioning

confidence: 99%

Realizing zT Values of 2.0 in Cubic GeTe

et al. 2021

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Over the past two years, GeTe has quickly cemented its place as the best performing thermoelectric material at a medium temperature range. The key factors behind the extraordinary performance lie in its favourable electronic and thermal properties, which arise from its unique crystal structure. The slight rhombohedral distortion at temperatures below 700 K results in lower lattice thermal conductivity while maintaining high electronic properties via high level of band‐convergence. In addition, while GeTe has a cubic structure above 700 K, the local atomic disorder persists, which maintains its low thermal conductivity. To date, the understanding of the temperature‐dependent thermoelectric properties of cubic GeTe at room temperature and above is very limited. This is due to the difficulties in stabilizing cubic GeTe at low temperatures. In this work, we leverage on low level of Ti doping to stabilize cubic‐phase GeTe at room temperature and elucidate its temperature‐dependent electronic and thermal properties. Further doping with In, Cu, Sb, and Pb results in zT as high as 2 at 773 K, and high average zT of 1.4 between 300 and 800 K.

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Tailoring the thermoelectric and structural properties of Cu–Sn based thiospinel compounds [CuM_1+xSn_1−xS₄ (M = Ti, V, Cr, Co)]

Abstract: We report here a rich variation of the thermoelectric properties of a series of Cu-Sn based thiospinels of composition CuM1+xSn1-xS4 upon partial substitution at the Sn-site with a variety of...

Cited by 25 publications

References 92 publications

Effects of Functionalization in Different Conditions and Ball Milling on the Dispersion and Thermal and Electrical Conductivity of MWCNTs in Aqueous Solution

Effects of Functionalization in Different Conditions and Ball Milling on the Dispersion and Thermal and Electrical Conductivity of MWCNTs in Aqueous Solution

Enhanced thermoelectric performance in polymorphic heavily Co-doped Cu₂SnS₃ through carrier compensation by Sb substitution

Realizing zT Values of 2.0 in Cubic GeTe

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Tailoring the thermoelectric and structural properties of Cu–Sn based thiospinel compounds [CuM1+xSn1−xS4 (M = Ti, V, Cr, Co)]

Abstract: We report here a rich variation of the thermoelectric properties of a series of Cu-Sn based thiospinels of composition CuM1+xSn1-xS4 upon partial substitution at the Sn-site with a variety of...

Cited by 25 publications

References 92 publications

Effects of Functionalization in Different Conditions and Ball Milling on the Dispersion and Thermal and Electrical Conductivity of MWCNTs in Aqueous Solution

Effects of Functionalization in Different Conditions and Ball Milling on the Dispersion and Thermal and Electrical Conductivity of MWCNTs in Aqueous Solution

Enhanced thermoelectric performance in polymorphic heavily Co-doped Cu2SnS3 through carrier compensation by Sb substitution

Realizing zT Values of 2.0 in Cubic GeTe

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Tailoring the thermoelectric and structural properties of Cu–Sn based thiospinel compounds [CuM_1+xSn_1−xS₄ (M = Ti, V, Cr, Co)]

Enhanced thermoelectric performance in polymorphic heavily Co-doped Cu₂SnS₃ through carrier compensation by Sb substitution