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Title: THERMOELECTRIC PERFORMANCE OF Na2B4O7-DOPED AND GRAPHENE-DISPERSED Bi2Sr2Co2Oy COMPOSITES
THERMOELECTRIC PERFORMANCE OF Na2B4O7-DOPED AND GRAPHENE-DISPERSED Bi2Sr2Co2Oy COMPOSITES

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Vakhtang Zhghamadze; Nikoloz Margiani; Masatoshi Takeda; Iamze Kvartskhava; Giorgi Mumladze
10.5593/sgem2024/4.1/s17.28
10.5593/sgem2024/4.1
1314-2704
978-619-7603-71-2
English
24
4.1
•    Prof. DSc. Oleksandr Trofymchuk, UKRAINE 
•    Prof. Dr. hab. oec. Baiba Rivza, LATVIA
17.Renewable Energy Sources and Clean Technologies
Renewable energy technologies are becoming increasingly important with the world's growing energy needs and environmental deterioration. In this context, thermoelectric materials capable of converting waste heat directly into electric power are at the forefront of extensive studies. The layered cobaltites have great potential for use in thermoelectric generators due to their environmental friendliness, good thermal and chemical stability, and relatively low cost of raw materials. Improving the thermoelectric properties of cobaltites using appropriate dopants and additives can increase their application potential. In this paper, we studied the impact of Na2B4O7-doping and addition of graphene on the thermoelectric performance of Bi2Sr2Co2Oy cobaltite. Reference and Na2B4O7-doped Bi2Sr2Co2Oy composites embedded with 0.8 wt. % graphene were prepared by the solid-state reaction route. The phase evolution and microstructure of the final products were studied by X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM) techniques. Temperature dependences of electrical resistivity, Seebeck coefficient, and thermal conductivity were measured and values of power factor (PF) and figure of merit (ZT) were calculated. It was found that the doping with Na2B4O7 and graphene dispersion enhanced the PF and ZT values by about 83 % and 20 %, respectively, compared with the reference Bi2Sr2Co2Oy.
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This work was supported by the Shota Rustaveli National Science Foundation of Georgia (SRNSFG) [grant number AR-22-470, Borates-containing graphene/ceramic thermoelectric composites — a step toward commercialization].
The authors would like to thank Dr. Armen Kuzanyan and Dr. Georgi Badalyan from the Institute for Physical Research, Ashtarak, Armenia for the SEM measurements.
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https://doi.org/10.5593/sgem2024/4.1/s17.28
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Proceedings of 24th International Multidisciplinary Scientific GeoConference SGEM 2024
24th International Multidisciplinary Scientific GeoConference SGEM 2024, 1 - 7 July, 2024
Proceedings Paper
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SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci and Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts and Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci and Arts; Acad Sci Moldova; Montenegrin Acad Sci and Arts; Georgian Acad Sci; Acad Fine Arts and Design Bratislava; Russian Acad Arts; Turkish Acad Sci.
211-218
1 - 7 July, 2024
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thermoelectricity, Bi2Sr2Co2Oy, doping, power factor, figure of merit

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