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Optimization of the Consolidation Parameters for Enhanced Thermoelectric Properties of Gr-Bi2Te2.55Se0.45 Nanocomposites

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submitted on 2024-07-23, 10:26 and posted on 2024-07-23, 12:23 authored by Farah El-Makaty, Abdel Magid Hamouda, Anas Abutaha, Khaled Youssef

Hot pressing represents a promising consolidation technique for ball-milled bismuth telluride alloys, yet deep investigations are needed to understand its effect on the thermoelectric properties. This paper studies the effect of hot-pressing parameters (temperature and pressure) on the thermoelectric properties of the n-type Gr-Bi2Te2.55Se0.45 nanocomposite. Ultra-high pressure, up to 1.5 GPa, is considered for the first time for consolidating Bi2(Te,Se)3 alloys. Results from this study show that increasing the temperature leads to changes in chemical composition and causes noticeable grain growth. On the contrary, increasing pressure mainly causes improvements in densification. Overall, increments in these two parameters improve the ZT values, with the temperature parameter having a higher influence. The highest ZT of 0.69 at 160 °C was obtained for the sample hot-pressed at 350 °C and 1 GPa for 5 min, which is indeed an excellent and competitive value when compared with results reported for this n-type Bi2Te2.55Se0.45 composition.

Other Information

Published in: Nanomaterials
License: https://creativecommons.org/licenses/by/4.0/
See article on publisher's website: https://dx.doi.org/10.3390/nano14030260

Funding

Qatar National Research Fund (NPRP10–0206–170366), Structure, Properties, and Fabrication of High Performance Thermoelectric Nano-Composites for Efficient Waste Heat Recovery.

Qatar National Research Fund (GSRA8-L-1-0414-21013), The Effect of MXene Nanofiller on The Thermoelectric Properties of Bismuth Telluride Nanocomposites.

History

Language

  • English

Publisher

MDPI

Publication Year

  • 2024

License statement

This Item is licensed under the Creative Commons Attribution 4.0 International License.

Institution affiliated with

  • Hamad Bin Khalifa University
  • Qatar Environment and Energy Research Institute - HBKU
  • Core Labs - QEERI
  • Qatar University
  • College of Arts and Sciences - QU
  • College of Engineering - QU

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    Qatar Environment and Energy Research Institute - HBKU

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