Synergetic effects of co-dispersed Cu and insulating HfO2 nanoparticles enabled high thermoelectric figure of merit in Bi0.5Sb1.5Te3 composites

Effect of Powder Heat Treatment on Chemical Composition and Thermoelectric Properties of Bismuth Antimony Telluride Alloys Fabricated by Combining Water Atomization and Spark Plasma Sintering

“…5 Sb 1 . 5 Te 3 thermoelectric alloy powder using the water atomization (WA) process [14]. The water atomized thermoelectric powder was loaded into a quartz tube and heat-treated at 673 K, 723 K, 743 K, 773 K, 803 K and 823 K for 60 min in a vacuum furnace of 10 −2 torr.…”

“…However, these fabrication methods were effective for enhancement of ZT by reducing κ L through phonon scattering, but have low productivity and are difficult to 2 of 9 apply in commercial applications. Recently, we developed a simple and economical viable water atomization method for the fabrication of alloy powders [14], though water atomized powder was required as further treatment for removing oxygen on the surface of the powder, because the molten stream directly interacts with water. The oxygen impurities severely affect the electrical conductivity in Bi 0 .…”

Synergistic Optimization of the Thermoelectric and Mechanical Properties of Large-Size Homogeneous Bi0.5Sb1.5Te3 Bulk Samples via Carrier Engineering for Efficient Energy Harvesting

“…Globally, thermoelectric (TE) energy conversion technology has drawn considerable interest recently in power generation via the Seebeck effect and refrigeration via the Peltier effect due to the excessive consumption of fossil fuels leads to energy crisis and environmental concerns such as global warming, loss of biodiversity, and exhaustion of ozone layer. − The efficiency of the module is strongly restricted through a low figure of merit ( ZT ) of component materials, which is represented as ZT = S 2 σ T /κ tot , where S , σ, κ tot , and T are the Seebeck coefficient, electrical conductivity, total thermal conductivity (combining of electronic contribution κ el and the lattice contribution κ L ), and the absolute temperature, respectively . Thus, a high ZT is required to achieve an excellent conversion efficiency of the device .…”

“…Several strategies have been adopted to enhance the ZT in the past decades. The most core approach is to improve the S 2 σ (power factor) by the optimization of n c via doping , or to introduce resonant states , and band convergence, , as well as to reduce the lattice contribution by enhancing phonon scattering through magnetic moment fluctuation and newly formed heterointerfaces by the incorporating superparamagnetic nanoparticles, , creating point defects, incorporating nanoinclusions, , and producing all-scale hierarchical architectures. , Using these strategies, the ZT values have been much improved more than unity.…”

Effect of Bi Nanoprecipitates on the Thermoelectric Properties of Bi‐Sb‐Te/Sb2O3 Nanocomposites

“…There are very few reports on the thermoelectric behavior of BiSbTe‐based composites hybridized with two different components, for example, co‐dispersed Cu and HfO 2 nanoparticles, [ 47 ] and TiO 2 ‒Ag nanoparticles, [ 48 ] perhaps due to the complexity of transport behavior analysis in such ternary systems. Having previously demonstrated outstanding thermoelectric performance of BiSbTe/Sb 2 O 3 nanocomposites and their excellent thermal and chemical stability in the ambient atmosphere up to 475 K, [ 18 ] in this work we have added Bi nanoprecipitates (that may also be regarded as nanodots due to their ultra‐small size) as the third phase to BiSbTe/Sb 2 O 3 and investigated the electronic and thermal transport behavior of this ternary nanocomposite system.…”