UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2024-11-24 23:02
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Conference: Bucharest University Faculty of Physics 2024 Meeting


Section: Solid State Physics and Materials Science


Title:
Enhancement of Thermoelectric Properties of Sodium Cobalt Oxide via Magnetic Field Application


Authors:
Esmaeil Jalali LAVASANI(1), ALI AL SHAREA(1,2), Sarah Al MASOODI(2)


*
Affiliation:
1) Faculty of Physics, University of Bucharest, 3NanoSAE Research Center, 077125 Bucharest-M ̆agurele, Romania

2)Iraqi Atomic Energy Commission–Baghdad, Baghdad P.O. Box 765, Iraq


E-mail
esmaeil.jalali@3nanosae.org alico842013@gmail.com sarahsaeed862013@gmail.com


Keywords:
Sodium cobalt oxide, Thermoelectric materials, Magnetic field enhancement, Seebeck coefficient, Energy conversion efficiency


Abstract:
Sodium cobalt oxide (NaCo₂O₄) is an extensively studied thermoelectric material[1]. It is prized for its robust electrical conductivity and substantial Seebeck coefficient, which are critical for efficient energy conversion[2]. This research focuses on the novel application of a magnetic field to enhance these inherent thermoelectric properties of sodium cobalt oxide. In this study, the powder of NaCo₂O₄ was synthesized by the sol-gel method. A cylinder tablet with a 2.5 cm diameter and 3 mm height was made of this powder to measure the thermoelectric material. A 0.3 Tesla magnetic field was applied perpendicular to the temperature gradient on both the hot and cold sides of the pellet to explore the potential enhancement of its thermoelectric properties. This experimental setup was designed to assess the impact of magnetic influence on the charge carrier mobility and scattering mechanisms, which are pivotal in the thermoelectric power generation process. The results indicated a marked increase in the output voltage upon applying the magnetic field, suggesting an enhanced Seebeck coefficient. The significant improvement in the output voltage and Seebeck coefficient under the magnetic field suggests that magnetic alignment influences the electronic transport properties of NaCo₂O₄. This study not only deepens the understanding of magneto-thermoelectric effects in sodium cobalt oxide but also opens up promising avenues for utilizing magnetic fields to boost the performance of cobalt oxide thermoelectric materials, offering a compelling strategy for optimizing energy harvesting technologies.


References:

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