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THERMOELECTRIC PERFORMANCE OF Na2B4O7-DOPED AND GRAPHENE-DISPERSED Bi2Sr2Co2Oy COMPOSITES
Abstract
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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Daichakomphu N., Sakdanuphab R., Harnwunggmoung A., Pinitsoontorn S., Sakulkalavek A., Achieving thermoelectric improvement through the addition of a small amount of graphene to CuAlO2 synthesized by solid-state reaction, Journal of Alloys and Compounds, vol. 753, pp 630-635, 2018. DOI: 10.1016/j.jallcom.2018.04.276.
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Margiani N., Zhghamadze V., Mumladze G., Kvartskhava I., Adamia Z., Klyndyuk A., Kuzanyan A., Impact of Graphene Addition on the Microstructure and Thermoelectric Properties of Bi2Sr2Co1.8Oy Ceramics, Bulletin of the Georgian National Academy of Sciences, vol. 16/issue 1, pp 17-24. 2022, DOI: http://science.org.ge/bnas/t16-n1/03_Margiani_Physics.pdf.
Rubesova K., Hlasek T., Jakes V., Huber S., Hejtmanek J., Sedmidubsky D., Effect of a powder compaction process on the thermoelectric properties of Bi2Sr2Co1.8Ox ceramics, Journal of the European Ceramic Society, vol. 35/issue 2, pp 525-531, 2015. DOI: 10.1016/j.jeurceramsoc.2014.08.037.
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