Researchers at Kunming University of Science and Technology have made a significant breakthrough in the field of thermoelectric materials, which could have profound implications for the construction industry. The team, led by Xing Yang, has developed polycrystalline SnSe0.95 materials that achieve an impressive average zT value of 0.62 across a broad temperature range, with a peak zT of 1.64 at 773 K. This advancement is crucial as it enhances the conversion efficiency of thermoelectric devices, which can be pivotal for sustainable energy solutions in construction.
The challenge with traditional SnSe materials has been their inadequate electrical conductivity, which limits their practical applications. However, by incorporating TaCl5 doping through a melting method combined with spark plasma sintering technology, the researchers have successfully increased the electrical conductivity significantly. “The doping process not only improves the electrical properties but also stabilizes the material, making it more viable for commercial applications,” Yang stated.
The research highlights how the TaCl5 doping releases additional electron carriers, enhancing electron transport capabilities. This is complemented by a high Seebeck coefficient, which is essential for converting temperature differences into electrical energy. The power factor for the modified SnSe0.95 material reached an astonishing 622 μW·m−1·K−2 at 773 K, nearly 21 times greater than that of the unmodified sample. Such improvements in power factor and zT value indicate the material’s potential for efficient power generation and cooling applications.
Moreover, the study reveals that the introduction of Ta not only boosts performance but also contributes to the stability of the SnSe0.95 material. By forming Ta2Sn3 and reducing the presence of low melting point Sn, the thermal conductivity is lowered, which is a critical factor for maintaining efficiency in thermoelectric devices. The researchers recorded a low lattice thermal conductivity of 0.24 W·m−1·K−1, thanks to the multiscale defects introduced during the doping process.
The implications of this research extend beyond theoretical advancements. The potential for thermoelectric materials to be integrated into construction practices could lead to buildings that generate their own power or maintain comfortable temperatures without relying heavily on traditional energy sources. As the construction industry increasingly seeks sustainable solutions, innovations like these could pave the way for energy-efficient designs and smart materials that play a role in reducing carbon footprints.
Xing Yang and his team’s work, published in the ‘Journal of Materiomics’, showcases a promising direction for thermoelectric materials that could transform how energy is harnessed and utilized in various sectors. As the industry moves towards greener technologies, the introduction of materials with enhanced thermoelectric performance may very well become a cornerstone of future construction practices. For more information on their work, you can visit Kunming University of Science and Technology.
