Electrothermal material based on strong coupling of bismuth sulfide and carbon nanotubes and preparation method thereof

Abstract

The invention discloses an electrothermal material based on strong coupling of bismuth sulfide and carbon nanotubes and a preparation method thereof. The preparation method comprises the following steps of: S1, adding carboxylated carbon nanotubes into a thioacetamide solution, and carrying out ultrasonic treatment at room temperature to obtain an intermediate reaction solution; S2, dropwise adding a nitric acid solution of bismuth nitrate pentahydrate into the intermediate reaction solution, and stirring for reaction to obtain a mixed solution; S3, centrifuging the mixed solution, and taking precipitate to obtain a bismuth sulfide-carbon nanotube crude product; and S4, subjecting the bismuth sulfide-carbon nanotube crude product to vacuum drying and heat treatment in an inert environment, so as to obtain a bismuth sulfide-carbon nanotube compound. The prepared electrothermal material is high in thermoelectric efficiency and beneficial to large-scale production.

Description

technical field [0001] The invention relates to the field of preparation of electrothermal materials, in particular to an electrothermal material based on strong coupling of bismuth sulfide and carbon nanotubes and a preparation method thereof. [0002] technical background [0003] The development of economy and society is inseparable from the continuous supply of energy. The depletion of non-renewable resources and environmental pollution seriously affect economic development and people's life and health. Therefore, it is imminent to explore and develop new renewable clean energy and efficient energy conversion and storage technologies. . Thermoelectric materials, also known as thermoelectric materials, are semiconductor functional materials that use the movement of carriers inside solids to realize mutual conversion between thermal energy and electrical energy. Partial and other advantages, as a new energy material has been widely concerned, thermoelectric power generatio...

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Problems solved by technology

Among metal chalcogenides, Bi-X (X is a chalcogen element) is the most studied compound, Bi 2 Te 3 is the most prominent compound among them, at present, Bi 2 Te 3 Based thermoelectric materials have been widely used in the fields of semiconductor refrigeration and thermoelectric power generation. Most of the mass production methods adopt the zone melting method. The obtained materials have high orientation and excellent electrical properties, but the mechanical properties are poor, and the material utilization rate is less than 50%. , its ZT value can reach up to 2.4, but because Te is rare and toxic element, and the thermal conductivity of these inorganic materials is high, the thermoelectric performance is not ideal. In addition, inorganic thermoelectric materials are difficult to process, expensive, toxic, etc. Shortcomings also hinder its commercial development

[0006] Composite materials are an effective way to improve TE performance by using the properties of different materials to complement each other. In the prior art, Giwon Goo et al. 2 Te 3 Combined with PEDOT:PSS to enhance the TE performance of the composite material, through material compounding, the conductivity of the composite material can be significantly improved and the Seebeck loss can be reduced, or the Seebeck of the composite material can be increased to reduce the conductivity loss. In addition, the formation of Chemical bonds can significantly improve the electron mobility of the composite, in this scheme Te is rare and toxic element, while Bi 2 Te 3 It is produced by smelting, followed by hot pressing or activation sintering. The preparation process of this method is complicated, the cost is high, and it is not conducive to large-scale production, and the thermoelectric efficiency of the prepared composite material is not high.

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