BiCuSeO based thermoelectric materials: Innovations and challenges

High-entropy materials for thermoelectric applications: towards performance and reliability

“…There is a wide range of TEMs operating at different temperature ranges as illustrated in Fig. 2C 1 , which include Bi 2 Te 3 , 17,62,63 SnSe, [64][65][66][67][68][69] GeTe, 70,71 Cu 2 Se, [72][73][74][75] Half-Heuslers, [76][77][78][79] MgAgSb, [80][81][82][83] SnTe, 84,85 PbTe, 86,87 clathrates, 88,89 BiCuSeO, 90,91 and skutterudites. 92,93 Based on the temperature range in which they are most effective, each of these TEMs is generally divided into three groups: (i) low to near room temperature (T o 300 K), the TEMs are often employed in cryogenic applications, such as cooling for superconductors, space exploration (Mars Perseverance rover), and medical devices; 94 (ii) medium temperature (300 K o T o 500 K), where they can be used in various devices such as mobile electronics and Internet of Things (IoT) devices that require energy harvesting or cooling in daily use; 95,96 and (iii) high temperature (500 K o T o 1200 K), this range covers a wide spectrum of industrial and commercial applications, such as automobile exhaust and industrial waste heat.…”

“…8C 3 ), exceeding the pristine BiCuSeO by a factor of 2.5. 90 However, this Bi 0.88 Pb 0.06 Ca 0.03 Yb 0.03 CuSeO system is considered as a medium-entropy material. Similar to that, Bi et al 204 synthesized a medium-entropy oxide TEM (Sr 1/3 Ba 1/3 Ca 1/3 )TiO 3 via the solid-state reaction and graphite burial sintering and obtained a lattice thermal conductivity of 1.90 W m −1 K −1 and maximum ZT of 0.13 both at 773 K. The same for the two Ca 0.98 Lu 0.02 Mn 0.96 Nb 0.04 O 3 and Ca 0.98 Yb 0.02 Mn 0.99 Nb 0.01 O 3 compositions reported by Nag et al 205 with a PF of 38 and 29 μW m −1 K −2 at 950 K, respectively.…”