Enhancement of thermoelectric properties by atomic-scale percolation in digenite Cu<sub>x</sub>S

Jiang, Qinghui; Yan, Haixue; Khaliq, Jibran; Shen, Yang; Simpson, Kevin; Reece, Michael J.

doi:10.1039/c4ta01250j

Cited by 55 publications

(42 citation statements)

References 23 publications

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“…The high impact force generated between the milling balls during the MA process and the high cooling rate after the process made the αDg structure more stable. 27 Pure Cu 1.8 S phase was obtained by sintering at T ≤ 873 K, but it was partly decomposed to Cu 1.96 S and S (volatilized) when the sintering temperature exceeded 973 K. In fact, a differential thermal analysis indicated that the decomposition starts at 817 K upon heating. 10 The decomposition is associated with sulfur volatilization, thereby lots of pores formed in the sample.…”

Section: B Digenite and Chalcocite (P-type)mentioning

confidence: 99%

“…The atomic-scale percolation phenomena of electric and thermal properties were then found in Cu 1.8±δ S, and the value of ZT was increased by 60% slightly below the percolation threshold value of δ in the conductive region. 27 Liquid-like behavior of Cu ion in the p-type Cu 2−δ S (δ = 0-0.03) affects thermal properties. 28 With increasing temperature, the heat capacity at constant pressure C p decreased clearly at T > 400 K and fell below the Dulong-Petit value at T > 800 K, leading to the reduction in κ ∝ C p .…”

Section: B Digenite and Chalcocite (P-type)mentioning

confidence: 99%

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Research Update: Cu–S based synthetic minerals as efficient thermoelectric materials at medium temperatures

2016

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Synthetic minerals and related systems based on Cu–S are attractive thermoelectric (TE) materials because of their environmentally benign characters and high figures of merit at around 700 K. This overview features the current examples including kesterite, binary copper sulfides, tetrahedrite, colusite, and chalcopyrite, with emphasis on their crystal structures and TE properties. This survey highlights the superior electronic properties in the p-type materials as well as the close relationship between crystal structures and thermophysical properties. We discuss the mechanisms of high power factor and low lattice thermal conductivity, approaching higher TE performances for the Cu–S based materials.

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Section: B Digenite and Chalcocite (P-type)mentioning

confidence: 99%

Section: B Digenite and Chalcocite (P-type)mentioning

confidence: 99%

Research Update: Cu–S based synthetic minerals as efficient thermoelectric materials at medium temperatures

2016

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“…[6][7][8][9][10][11][12] One typical example is copper sulfides (Cu x S). [9][10][11] This family of compounds has been intensively studied in the past fifty years mainly focusing on the structural complexity and applications in solar cells. [13][14][15] In contrast, TE properties of Cu x S have been studied only very recently.…”

mentioning

confidence: 99%

Electrical and thermal transports of binary copper sulfides CuxS with x from 1.8 to 1.96

et al. 2016

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In this study, a series of copper sulfides CuxS with x spanning from 1.8 to 1.96 was prepared and their crystal structures, elemental valence states, and thermoelectric properties were systematically studied. The valence state of Cu in CuxS is unchanged as the ratio of Cu/S varies, while the thermoelectric properties are very sensitive to the deficiency of Cu. In addition, the type of sulfur arrangement in the crystal structure also plays an important role on the electrical transports. Finally, the optimum Cu/S atomic ratios in the binary CuxS system were identified for high power factor and thermoelectric figure of merit.

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“…However, the study is very fruitful and inspiring, which can assist to decide a proper composition of Cu 2− x S for an optimized thermoelectric behavior. After a long gap, recently, many research teams have reported the thermoelectric properties of copper sulfide as a function of its phases …”

Section: Strategies To Improve Thermoelectric Properties Of Copper Sumentioning

confidence: 99%

Copper Sulfides: Earth‐Abundant and Low‐Cost Thermoelectric Materials

Mulla

Rabinal

2019

Energy Tech

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The depletion of nonrenewable energy sources insisted the search for new types of energy solutions. Thermoelectric conversion is one possible energy solution which converts waste heat into useful electricity. In the past several years, thermoelectric research developed many novel materials. Among these, most of the practically useful materials with better performance are based on Bi, Pb, Te, and Sb, but are toxic and expensive. There is a need of earth‐abundant, low‐cost, and less‐toxic compounds with superior thermoelectric performance so as to realize the large‐scale commercial applications. Recent studies have identified eco‐friendly thermoelectric materials based on the alloys of copper and sulfur, suggesting an alternative to the well‐established expensive thermoelectric materials. These compounds exhibit interesting electronic properties with better thermoelectric efficiency (zT). The structural properties permit to decouple electrical and thermal conductivities, which is an essential requirement to get improved efficiency. Several approaches, such as phase tuning, doping, nanostructure/microstructure designing, compound formation, etc., are chosen to increase the performance. On the whole, the present review summarizes the strategies and techniques that have been adopted to improve the thermoelectric behavior of copper sulfides and its compounds.

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Enhancement of thermoelectric properties by atomic-scale percolation in digenite Cu_xS

Abstract: Atomic-scale percolation phenomena were found in digenite CuxS, providing a new strategy to optimize the properties of thermoelectric materials, especially for quasi disordered materials.

Cited by 55 publications

References 23 publications

Research Update: Cu–S based synthetic minerals as efficient thermoelectric materials at medium temperatures

Research Update: Cu–S based synthetic minerals as efficient thermoelectric materials at medium temperatures

Electrical and thermal transports of binary copper sulfides CuxS with x from 1.8 to 1.96

Copper Sulfides: Earth‐Abundant and Low‐Cost Thermoelectric Materials

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Enhancement of thermoelectric properties by atomic-scale percolation in digenite CuxS

Abstract: Atomic-scale percolation phenomena were found in digenite CuxS, providing a new strategy to optimize the properties of thermoelectric materials, especially for quasi disordered materials.

Cited by 55 publications

References 23 publications

Research Update: Cu–S based synthetic minerals as efficient thermoelectric materials at medium temperatures

Research Update: Cu–S based synthetic minerals as efficient thermoelectric materials at medium temperatures

Electrical and thermal transports of binary copper sulfides CuxS with x from 1.8 to 1.96

Copper Sulfides: Earth‐Abundant and Low‐Cost Thermoelectric Materials

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Enhancement of thermoelectric properties by atomic-scale percolation in digenite Cu_xS