Akademik Veri Yönetim Sistemi
Journal of Solid State Chemistry, cilt.344, 2025 (SCI-Expanded, Scopus)
Exploiting materials with high thermoelectric performance (TEP) is crucial for improving energy conversion efficiency and addressing future energy needs. This study reports the influence of meso-hierarchical engineering approach on structural properties, and TEP of Bi/Sb–Te based compounds. The meso-hierarchical engineering approach is based on substitute a certain amount of single-crystalline p-type Sb2Te3 (ST) like-nanoplates into polycrystalline p- and n-types Sb1.5Bi0.5Te3 (SBT) and Bi2Te0.3Se2.7 (BTSe) nanoparticles, respectively. The characterizations showed that the incorporation of ST into the SBT increases the density of nano-micro grains and the number of interfaces. Thereby, for 10%ST/SBT the electric conductivity, Seebeck coefficient, and power factor parameters were improved by 56.41 %, 8.75 % and 57.93 %, at ambient temperature compared to bulk SBT alloy, respectively. The lattice and total thermal conductivities were achieved a significant drop of 20.83 % and 20.34 % for 10%ST/SBT alloys at ambient temperature. Furthermore, 5%ST/SBT and 10%ST/SBT showed a remarkable a peak figure of merit (zT) of 1.1 and 1.13 were obtained at 328 and 303 K, respectively. Based on the high TEP of 5%ST/SBT and BTSe in the temperature of 300–400 K were used as p-and n-type legs to analyze the certain sized TE cooler model. The numerical modeled TEC observed a maximum cooling temperature difference as 71.64 K at hot-side temperature of 379.46 K and cooling load of 0.2 W. Moreover, at optimal cooling load of 0.5 W the maximum cooling temperature difference was found to be 64.73K at hot-side temperature of 393.41 K.