Highly enhanced thermoelectric performance of copper sulfide by compositing with CNT &amp; CuO

Li, Zugang; Gu, Shi‐Wei; Zhang, Yixin; Yang, Tianyu; Bao, Rui; Feng, Jing; Ge, Zhen‐Hua

doi:10.1016/j.jallcom.2023.169954

Cited by 4 publications

(1 citation statement)

References 31 publications

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“…Thermoelectric (TE) materials have gained increasing importance in the domain of energy harvesting and conversion, owing to their capacity to convert thermal energy into electrical energy and vice versa. TE devices are characterized by their exceptional reliability, scalability, and silent operation, rendering them highly suitable for decentralized power generation on a small scale. − The performance of TE devices is measured using a dimensionless figure of merit false( Z T = σ S 2 κ T false) which is determined by a combination of factors such as Seebeck coefficient ( S ), absolute temperature ( T ), electrical resistivity (σ), and thermal conductivity (κ). − A challenge arises in balancing a high power factor (PF = S 2 σ) and a low thermal conductivity together, since these properties are often inversely proportional to each other and constrained by carrier concentrations. , Consequently, a significant portion of the research on TE materials is dedicated to enhancing their electrical transport properties and simultaneously reducing the overall thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Ultralow Thermal Conductivity and Enhanced Thermoelectric Properties Realized in Polycrystalline Bi₂S₂Se via Carrier and Microstructure Modulation

Zhong,

Wang,

Yang

et al. 2024

ACS Appl. Energy Mater.

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Bi 2 S 2 Se compounds have been investigated as the most promising ternary component in the Bi 2 S 3 −Bi 2 Se 3 system. However, there is still some space to increase the thermoelectric (TE) performance. In this work, the TE properties of the Bi 2 S 2 Se system have been enhanced through the utilization of BiI 3 as a highly effective n-type dopant, leveraging the advantageous high solubility of the iodine(I) within the material. The results showed that BiI 3 could effectively improve the electrical conductivity of the Bi 2 S 2 Se matrix by shifting the Fermi level toward the conduction band. As the BiI 3 content increases, the conductivity shows an increasing trend. When the BiI 3 content is 1 wt %, it reaches its maximum value of 32.4 S cm −1 , representing a 400% improvement compared to the undoped sample. Additionally, the point defects due to the I solid solution served as effective phonon scattering centers combined with pores left by sublimation of I. Both factors worked together to suppress lattice thermal conductivity effectively. Ultimately, benefiting from the simultaneous optimization of electrical and thermal properties, the best ZT value of 0.65 is achieved for the sample with 1 wt % BiI 3 addition. The temperature range of 473−673 K exhibits an average ZT that approximates 0.55. This study confirmed that BiI 3 could effectively enhance the TE performance of Bi 2 S 2 Se, and held promising prospects for further applications.

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Section: Introductionmentioning

confidence: 99%

Ultralow Thermal Conductivity and Enhanced Thermoelectric Properties Realized in Polycrystalline Bi₂S₂Se via Carrier and Microstructure Modulation

Zhong,

Wang,

Yang

et al. 2024

ACS Appl. Energy Mater.

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Pseudopolymorphic Phase Engineering for Improved Thermoelectric Performance in Copper Sulfides

Yang,

Gu,

Zhang

et al. 2023

Advanced Materials

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Polymorphism (and its extended form – pseudopolymorphism) in solids is ubiquitous in mineralogy, crystallography, chemistry/ biochemistry, materials science and the pharmaceutical industries. Despite the difficulty of controlling (pseudo‐)polymorphism, the realization of specific (pseudo‐)polymorphic phases and associated boundary structures is an efficient route to enhance material performance for energy conversion and electromechanical applications. Here, we apply the pseudopolymorphic phase (PP) concept to a thermoelectric copper sulfide, Cu2‐xS (x ≤ 0.25), via CuBr2 doping. A peak ZT value of 1.25 is obtained at 773 K in Cu1.8S + 3 wt.% CuBr2, which is 2.3 times higher than that of a pristine Cu1.8S sample. Atomic‐resolution scanning transmission electron microscopy confirms the transformation of pristine Cu1.8S low digenite into PP‐engineered high digenite, as well as the formation of (semi‐)coherent interfaces between different PPs, which is expected to enhance phonon scattering. Our results demonstrate that PP engineering is an effective approach for achieving improved thermoelectric performance in Cu‐S compounds. It is also expected to be useful in other materials.This article is protected by copyright. All rights reserved

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Development and characterization of Cu-Ni- Al2O3 surface composite developed by friction stir process technique

Dwivedi,

Sharma

2023

Materials Today Communications

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Highly enhanced thermoelectric performance of copper sulfide by compositing with CNT & CuO

Cited by 4 publications

References 31 publications

Ultralow Thermal Conductivity and Enhanced Thermoelectric Properties Realized in Polycrystalline Bi₂S₂Se via Carrier and Microstructure Modulation

Ultralow Thermal Conductivity and Enhanced Thermoelectric Properties Realized in Polycrystalline Bi₂S₂Se via Carrier and Microstructure Modulation

Pseudopolymorphic Phase Engineering for Improved Thermoelectric Performance in Copper Sulfides

Development and characterization of Cu-Ni- Al2O3 surface composite developed by friction stir process technique

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Highly enhanced thermoelectric performance of copper sulfide by compositing with CNT & CuO

Cited by 4 publications

References 31 publications

Ultralow Thermal Conductivity and Enhanced Thermoelectric Properties Realized in Polycrystalline Bi2S2Se via Carrier and Microstructure Modulation

Ultralow Thermal Conductivity and Enhanced Thermoelectric Properties Realized in Polycrystalline Bi2S2Se via Carrier and Microstructure Modulation

Pseudopolymorphic Phase Engineering for Improved Thermoelectric Performance in Copper Sulfides

Development and characterization of Cu-Ni- Al2O3 surface composite developed by friction stir process technique

Contact Info

Product

Resources

About

Ultralow Thermal Conductivity and Enhanced Thermoelectric Properties Realized in Polycrystalline Bi₂S₂Se via Carrier and Microstructure Modulation

Ultralow Thermal Conductivity and Enhanced Thermoelectric Properties Realized in Polycrystalline Bi₂S₂Se via Carrier and Microstructure Modulation