Thermoelectric performance of Ni,Co, and Fe nanoparticles incorporated into their metal borates glassy matrices |
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Authors: | Isam M Arafa Mazin Y Shatnawi Yousef N Obeidallah |
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Affiliation: | 1. Department of Applied Chemistry, Faculty of Science and Arts, Jordan University of Science and Technology, Irbid, Jordan;2. Department of Applied Chemistry, Faculty of Science and Arts, Jordan University of Science and Technology, Irbid, Jordan
Contribution: Funding acquisition, Supervision, Writing - review & editing;3. Department of Applied Chemistry, Faculty of Science and Arts, Jordan University of Science and Technology, Irbid, Jordan
Contribution: ?Investigation |
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Abstract: | Here, we present our current attempt to intrinsically dope Ni0, Co0, and Fe0 nanoparticles within NiII-, CoII-, and FeII-borate glassy matrices, respectively. The system was prepared by one-pot reaction of the desired MTII salt with excess NaBH4 through an in-situ reduction and hydrolysis processes to afford metallic MT0 nanoparticles dispersed into the MT-BO3 matrix. The composition and structural characteristics of these MT0:MT-BO3 materials were identified by thermal oxidation, ATR-IR, X-ray powder diffraction, and magnetic techniques as glassy/amorphous borate matrices containing magnetic nanoparticles. The electrical conductivity (σ) of cold-pressed discs of these metal-doped composites shows that they behave as nonohmic semiconductors within the temperature range of 303 ≤ T ≤ 373 K suggesting a mixed electronic-ionic conduction. However, their thermal conductivity (κ) occurs through phonon lattice vibration dynamics rather than electronic. The σ/κ ratio shows a steep non-linear increase from 9.4 to 270 KV?2 in Ni0:Ni-BO3. In contrast, a moderate-weak increase is observed for Co0:Co-BO3 and Fe0:Fe-BO3 analogs. The obtained materials are examined for thermoelectric (TE) applications by determining their Seebeck coefficient (S) power factor (PF), figure of merit (ZT), and conversion efficiency (η%). All the TE data shows that Ni0:Ni-BO3 (S, 80 μVK?1; PF, 97.7 mWm?1 K?1; ZT 0.54; η, 2.15%) is a better TE semiconductor than the other two MT0:MT-BO3. This finding shows that Ni0:Ni-BO3 is a promising candidate to exploit low-temperature waste heat from body heat, sunshine, and small domestic devices for small-scale TE applications. |
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Keywords: | heat harvesting metal borates metal nanoparticles Seebeck Soret effect thermoelectricity |
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