High thermoelectric performance and low thermal conductivity in Cu2-xNaxSe bulk materials with micro-pores

Zhu, Zheng; Zhang, Yuewen; Song, Hang; Li, Xinjian

doi:10.1007/s00339-019-2870-8

Cited by 35 publications

(17 citation statements)

References 41 publications

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“…Similar results are founded in Cu 2 Se materials with other alkali metal dopants. Zheng Zhu et al [ 43 , 44 ] get the same nanopore microstructure in the Na and K doped Cu 2 Se bulk materials through the same synthesis approaches as Li doped samples. ZT values of 2.1 at 973 K and 1.19 at 773 K were achieved for Cu 1.96 Na 0.04 Se and Cu 1.97 K 0.03 Se respectively.…”

Section: Doping By Group Ia and Iia Elementsmentioning

confidence: 99%

Doping Effect on Cu2Se Thermoelectric Performance: A Review

et al. 2020

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Cu2Se, owing to its intrinsic excellent thermoelectric (TE) performance emerging from the peculiar nature of “liquid-like” Cu+ ions, has been regarded as one of the most promising thermoelectric materials recently. However, the commercial use is still something far from reach unless effective approaches can be applied to further increase the figure of merit (ZT) of Cu2Se, and doping has shown wide development prospect. Until now, the highest ZT value of 2.62 has been achieved in Al doped samples, which is twice as much as the original pure Cu2Se. Herein, various doping elements from all main groups and some transitional groups that have been used as dopants in enhancing the TE performance of Cu2Se are summarized, and the mechanisms of TE performance enhancement are analyzed. In addition, points of great concern for further enhancing the TE performance of doped Cu2Se are proposed.

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Section: Doping By Group Ia and Iia Elementsmentioning

confidence: 99%

Doping Effect on Cu2Se Thermoelectric Performance: A Review

et al. 2020

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“…Priority was given to various methods of "cold" synthesis, which do not require large time and energy costs, and allow one to immediately obtain synthesis products in nanosized form. Thermoelectric efficiency of some thermoelectric materials: Cu1.97S [84], Na0.04Cu1.96Se [53], Na0.01Cu1.80S [31], Cu2Se + 1% CuInSe2 [85], Cu1.94Se0.5S0.5 [86], Bi0.5Sb1.5Te3 + x% Te [87], Ta0.74V0.1Ti0.16FeSb [88], Pb0.94Mg0.02Na0.04Te [89], MgAg0.965Ni0.005Sb0.99 [90], SnSe1-xBrx [91], Bi2Te2.79Se0.21 [92].…”

Section: Methods For Synthesis Of Perspective Thermoelectric Materialsmentioning

confidence: 99%

“…By carefully adjusting the pH value, monomer concentration, as well as the reaction temperature and reaction time, bismuth chalcogenides with various nanostructures such as nanostring-cluster hierarchical Bi 2 Te 3 and Bi 2 S 3 nanoribbons and Bi 2 Te 3 nanoplates have been successfully synthesized using the hydrothermal methods. For instance, in Zhu et al's [53] work, the nanocrystalline Na 0.04 Cu 1. 96 Se bulk samples were synthesized with excellent ZT = 2.1 at 700 • C by combining hydrothermal synthesis and hot pressing.…”

Section: Methods For Synthesis Of Perspective Thermoelectric Materialsmentioning

confidence: 99%

“…It is possible that if not digenite, but jarleite (with the same 4 at.% Sodium) was chosen as the matrix for doping, the thermoelectric efficiency would be higher with the same low thermal conductivity due to the superionic state of the lattice and developed porosity. [53], i.e., independently, but what makes these works similar it is a high porosity of the material's structure due to sodium doping. However, the material synthesized by Zhu turned out to be much more efficient (ZT ~1.3 at 500 °C) due to the fact that the thermal conductivity of his material was lower, while the factor α 2 σ was almost close for both materials.…”

Section: Electronic Conductivitymentioning

confidence: 99%

“…Sodium doping in copper chalcogenides was studied in works [31,[36][37][38][39][40]53,138]. Copper chalcogenides with a high sodium content are not homogeneous and form a mixture of phases with different conducting and thermoelectric properties, but deserve attention as nanocomposite thermoelectric materials with low thermal conductivity.…”

Section: Cu 2-δ Tementioning

confidence: 99%

See 2 more Smart Citations

Some Thermoelectric Phenomena in Copper Chalcogenides Replaced by Lithium and Sodium Alkaline Metals

et al. 2021

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This review presents thermoelectric phenomena in copper chalcogenides substituted with sodium and lithium alkali metals. The results for other modern thermoelectric materials are presented for comparison. The results of the study of the crystal structure and phase transitions in the ternary systems Na-Cu-S and Li-Cu-S are presented. The main synthesis methods of nanocrystalline copper chalcogenides and its alloys are presented, as well as electrical, thermodynamic, thermal, and thermoelectric properties and practical application. The features of mixed electron–ionic conductors are discussed. In particular, in semiconductor superionic copper chalcogenides, the presence of a “liquid-like phase” inside a “solid” lattice interferes with the normal propagation of phonons; therefore, superionic copper chalcogenides have low lattice thermal conductivity, and this is a favorable factor for the formation of high thermoelectric efficiency in them.

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Thermoelectric Copper and Silver Chalcogenides

KLEINKE

2023

Thermoelectric Micro/Nano Generators 1

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High thermoelectric performance and low thermal conductivity in Cu2-xNaxSe bulk materials with micro-pores

Cited by 35 publications

References 41 publications

Doping Effect on Cu2Se Thermoelectric Performance: A Review

Doping Effect on Cu2Se Thermoelectric Performance: A Review

Some Thermoelectric Phenomena in Copper Chalcogenides Replaced by Lithium and Sodium Alkaline Metals

Thermoelectric Copper and Silver Chalcogenides

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