Enhanced thermoelectric properties of hydrothermally synthesized Bi0.88−xZnxSb0.12 nanoalloys below the semiconductor–semimetal transition temperature

Gharleghi, Ahmad; Hung, Roy Hung; Yang, Zihao; Malekfar, Rasoul; Liu, Chia‐Jyi

doi:10.1039/c8ra03858a

Cited by 5 publications

(4 citation statements)

References 50 publications

(82 reference statements)

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“…However, the Bi–Sb single crystal is difficult to use for commercial purposes due to its poor mechanical properties. In the last decade, many efforts have been made to improve the TE performance of Bi–Sb polycrystalline materials, including tuning the carrier concentration, − resonance level, texturing, and nanostructuring. , Among these strategies, constructing nanostructured Bi–Sb materials has attracted much attention of researchers. The Bi–Sb nanowires and nanofilms can obtain a high PF due to the improvement of S caused by the quantum confinement effect.…”

Section: Introductionmentioning

confidence: 99%

Magnetism Modulation for Cryogenic Thermoelectric Enhancements in Fe₃O₄ Nanoparticle-Incorporated Bi_0.85Sb_0.15 Nanocomposites

Wang

Zhu

Luo

et al. 2023

ACS Appl. Mater. Interfaces

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The internal magnetism introduced by the magnetic nanoparticles combined with the external magnetic field can provide an effective way to modulate the thermoelectric (TE) properties of materials. Herein, we comparably investigate the effect of magnetism of Fe 3 O 4 nanoparticles (Fe 3 O 4 -NPs) and the external magnetic field on the cryogenic thermoelectric properties of Fe 3 O 4 -NP/Bi 0.85 Sb 0.15 nanocomposites. With the ferromagnetism−superparamagnetism transition, the Fe 3 O 4 -NPs in the superparamagnetic state exhibit a stronger magneto-trapped carrier effect, where the electron concentration at high temperature is evidently reduced. With the simultaneous increase of S and reduction of electronic thermal conductivity, a high ZT value of 0.33 at 180 K is obtained for 0.05 wt % Fe 3 O 4 /Bi 0.85 Sb 0.15 . Meanwhile, under the external magnetic field, the magnetoresistance of the composites is suppressed by Fe 3 O 4 -NPs, which results in a remarkable enhancement of the electronic transport performance. Consequently, the highest ZT value of 0.48 at 220 K under 1 T is achieved for 0.1 wt % Fe 3 O 4 -NPs/Bi 0.85 Sb 0.15 , increased by 55% compared with that of the matrix. A single-leg device is prepared using 0.1 wt % Fe 3 O 4 -NP/Bi 0.85 Sb 0.15 nanocomposites. Its cooling temperature difference at 180 K reaches 1.3 and 3.2 K under 0 and 1 T when applying 300 mA current, increased by 20 and 46% compared with that of the matrix, respectively. This work suggests that magnetism modulation with introducing magnetic nanoparticles will enhance the TE and magneto-TE performance of composite materials.

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Section: Introductionmentioning

confidence: 99%

Magnetism Modulation for Cryogenic Thermoelectric Enhancements in Fe₃O₄ Nanoparticle-Incorporated Bi_0.85Sb_0.15 Nanocomposites

Wang

Zhu

Luo

et al. 2023

ACS Appl. Mater. Interfaces

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“…2,3 Recovery of low-temperature waste heat and its conversion to useful energy are suitable for thermoelectric technology, provided high-efficiency materials and devices can be attainable at 300−550 K. The efficiency of thermoelectric materials gauged by their dimensionless figure of merit zT = σS 2 T/κ, where σ, S, κ, and T are the electrical conductivity, Seebeck coefficient, thermal conductivity, and the absolute temperature. 4,5 σS 2 is the thermoelectric power factor and is a quantity for targeting power generation from waste heat recovery for thermoelectric applications.…”

Section: Introductionmentioning

confidence: 99%

“…The industrial waste heat generated at high temperatures could be gathered without difficulty and reutilized. However, it is challenging to reap low-temperature waste heat, specifically from room temperature to mid-temperature (300–550 K), due to its low excellent and occasional energy density. , Recovery of low-temperature waste heat and its conversion to useful energy are suitable for thermoelectric technology, provided high-efficiency materials and devices can be attainable at 300–550 K. The efficiency of thermoelectric materials gauged by their dimensionless figure of merit zT = σ S 2 T /κ, where σ, S , κ, and T are the electrical conductivity, Seebeck coefficient, thermal conductivity, and the absolute temperature. , σ S 2 is the thermoelectric power factor and is a quantity for targeting power generation from waste heat recovery for thermoelectric applications.…”

Section: Introductionmentioning

confidence: 99%

High Performance of Post-Treated PEDOT:PSS Thin Films for Thermoelectric Power Generation Applications

Paulraj

Liang

Yang

et al. 2021

ACS Appl. Mater. Interfaces

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Thermoelectric materials capable of converting waste heat energy into electrical energy are enchanting for applications in wearable electronics and sensors by harvesting heat energy of the human body. Organic conducting polymers offer promise of thermoelectric materials for next-generation power sources of wearable devices due to their low cost in preparation, easy processing, low toxicity, low thermal conductivity, mechanical flexibility, light weight, and large area application. Generally, the pristine PEDOT:PSS film has low electrical conductivity, small Seebeck coefficient, and low thermal conductivity. The thermoelectric power factors of conducting polymers of p-type PEDOT:PSS films are considerably improved via synergistic effect by using ethylene glycol and reductants of EG/NaBH 4 or EG/NaHCO 3 . As such, the charge carrier concentration of PEDOT:PSS films is tuned. The synergistic effect might lead to enhanced variation of density of states at the Fermi level and hence enhanced Seebeck coefficient. The resulting PEDOT:PSS films were characterized by atomic force microscopy (AFM), Raman spectroscopy, and XPS spectroscopy. The electrical conductivity and Seebeck coefficient were measured between 325 and 450 K. The carrier concentration and mobility were obtained by Hall measurements. The pristine thin film treated with 0.05 M EG/NaHCO 3 solution exhibits the highest power factor of 183 μW m −1 K −2 at 450 K among these two series of films due to its significant enhanced Seebeck coefficient of 48 μV/K. The maximum output power of 121.08 nW is attained at the output voltage of 6.98 mV and the output current of 17.45 μA. The corresponding maximum power density is 98 μW/cm 2 for a power generation device made of four pairs of p-leg (EG/NaHCO 3 post-treated PEDOT:PSS) and n-leg (Cu 0.6 Ni 0.4 ) on the polyamide substrate with the size of 4 mm × 20 mm for each leg.

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“…In these systems, there are a few reports of a transition from the semiconducting to the metallic/semi metallic state (Gharleghi et al, 2018). But the Goldsmid-Sharp band gap, calculated from the saturated S value and given by Eg = 2e|S|maxTmax, does not support this possibility.…”

Section: Te Properties and Nominal Valence Electron Configurationmentioning

confidence: 97%

Half-Heusler based multicomponent alloys for high temperature thermoelectric applications

Mishra

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Enhanced thermoelectric properties of hydrothermally synthesized Bi_0.88−xZn_xSb_0.12 nanoalloys below the semiconductor–semimetal transition temperature

Abstract: The peak zT is attained for hydrothermally synthesized Bi0.83Zn0.05Sb0.12 nanoalloy due to the significantly enhanced thermoelectric power factor and relatively low thermal conductivity.

Cited by 5 publications

References 50 publications

Magnetism Modulation for Cryogenic Thermoelectric Enhancements in Fe₃O₄ Nanoparticle-Incorporated Bi_0.85Sb_0.15 Nanocomposites

Magnetism Modulation for Cryogenic Thermoelectric Enhancements in Fe₃O₄ Nanoparticle-Incorporated Bi_0.85Sb_0.15 Nanocomposites

High Performance of Post-Treated PEDOT:PSS Thin Films for Thermoelectric Power Generation Applications

Half-Heusler based multicomponent alloys for high temperature thermoelectric applications

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Enhanced thermoelectric properties of hydrothermally synthesized Bi0.88−xZnxSb0.12 nanoalloys below the semiconductor–semimetal transition temperature

Abstract: The peak zT is attained for hydrothermally synthesized Bi0.83Zn0.05Sb0.12 nanoalloy due to the significantly enhanced thermoelectric power factor and relatively low thermal conductivity.

Cited by 5 publications

References 50 publications

Magnetism Modulation for Cryogenic Thermoelectric Enhancements in Fe3O4 Nanoparticle-Incorporated Bi0.85Sb0.15 Nanocomposites

Magnetism Modulation for Cryogenic Thermoelectric Enhancements in Fe3O4 Nanoparticle-Incorporated Bi0.85Sb0.15 Nanocomposites

High Performance of Post-Treated PEDOT:PSS Thin Films for Thermoelectric Power Generation Applications

Half-Heusler based multicomponent alloys for high temperature thermoelectric applications

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Enhanced thermoelectric properties of hydrothermally synthesized Bi_0.88−xZn_xSb_0.12 nanoalloys below the semiconductor–semimetal transition temperature

Magnetism Modulation for Cryogenic Thermoelectric Enhancements in Fe₃O₄ Nanoparticle-Incorporated Bi_0.85Sb_0.15 Nanocomposites

Magnetism Modulation for Cryogenic Thermoelectric Enhancements in Fe₃O₄ Nanoparticle-Incorporated Bi_0.85Sb_0.15 Nanocomposites