High mechanical robustness is essential to the material’s processibility for the applications in flexible and miniaturized electronics.As state-of-the-art room-temperature thermoelectric materials,Ag_(2)Se_(1–x)Te_(...High mechanical robustness is essential to the material’s processibility for the applications in flexible and miniaturized electronics.As state-of-the-art room-temperature thermoelectric materials,Ag_(2)Se_(1–x)Te_(x)alloys exhibit superior thermoelectric transport properties but their mechanical properties remain largely unexplored.Herein,we systematically investigate the mechanical and thermoelectric properties of a series of Ag_(2)Se_(1–x)Te_(x)materials.Among them,Ag_(2)Se_(0.9)Te_(0.1)shows robust mechanical properties including a large compression strain of(26.7±4.5)%,a high compression strength of(279.2±49)MPa,and an excellent fracture toughness of(4.5±0.6)MPa m^(1/2).These robust mechanical properties are ascribed to the dense dislocations as well as possible sub-grain rotations.Combined with the excellent thermoelectric figure of merit,z T of 0.78 at 300 K and 1.1 at 380 K,the Ag_(2)Se_(1–x)Te_(x)alloys are promising candidates for robust and efficient thermoelectric applications near room temperature.展开更多
In this work,poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)coated silver telluride(PCeAg2Te)nanorods were prepared by a wet-chemical method using the PEDOT:PSS coated tellurium(PCeTe)nanorods as th...In this work,poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)coated silver telluride(PCeAg2Te)nanorods were prepared by a wet-chemical method using the PEDOT:PSS coated tellurium(PCeTe)nanorods as the templates.Flexible PCeAg2Te nanocomposite film on polyethersulfone(PES)substrate was prepared through vacuum filtration followed by mechanical pressing process.An optimal PCeAg2Te nanocomposite film showed a maximum power factor of 143.3 mW/mK^(2) at room temperature and 221.7 μW/mK^(2 ) at 373 K.The electrical conductivity of the PCeAg2Te composite film decreased by3.3%after bending for 1000 times around a rod with a radius of 5 mm.An eight-leg thermoelectric generator assembled with the optimal PCeAg2Te nanocomposite film generated a maximum output power and output density of 209.4 nW and 141.5 mW/cm^(2) at a temperature gradient of 30.3 K.This work provides a facile method to prepare thermoelectric materials for flexible thermoelectric generators.展开更多
基金supported by the National Natural Science Foundation of China(92463310,52373292)supported by the National Natural Science Foundation of China(52232010)supported by the Zhejiang Provincial Natural Science Foundation of China(LD25E020001)。
文摘High mechanical robustness is essential to the material’s processibility for the applications in flexible and miniaturized electronics.As state-of-the-art room-temperature thermoelectric materials,Ag_(2)Se_(1–x)Te_(x)alloys exhibit superior thermoelectric transport properties but their mechanical properties remain largely unexplored.Herein,we systematically investigate the mechanical and thermoelectric properties of a series of Ag_(2)Se_(1–x)Te_(x)materials.Among them,Ag_(2)Se_(0.9)Te_(0.1)shows robust mechanical properties including a large compression strain of(26.7±4.5)%,a high compression strength of(279.2±49)MPa,and an excellent fracture toughness of(4.5±0.6)MPa m^(1/2).These robust mechanical properties are ascribed to the dense dislocations as well as possible sub-grain rotations.Combined with the excellent thermoelectric figure of merit,z T of 0.78 at 300 K and 1.1 at 380 K,the Ag_(2)Se_(1–x)Te_(x)alloys are promising candidates for robust and efficient thermoelectric applications near room temperature.
基金supported by the National Natural Science Foundation of China(51972234,51632010)the National Key Research&Development Project of China(Grant No.2018YFE0111500)。
文摘In this work,poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)coated silver telluride(PCeAg2Te)nanorods were prepared by a wet-chemical method using the PEDOT:PSS coated tellurium(PCeTe)nanorods as the templates.Flexible PCeAg2Te nanocomposite film on polyethersulfone(PES)substrate was prepared through vacuum filtration followed by mechanical pressing process.An optimal PCeAg2Te nanocomposite film showed a maximum power factor of 143.3 mW/mK^(2) at room temperature and 221.7 μW/mK^(2 ) at 373 K.The electrical conductivity of the PCeAg2Te composite film decreased by3.3%after bending for 1000 times around a rod with a radius of 5 mm.An eight-leg thermoelectric generator assembled with the optimal PCeAg2Te nanocomposite film generated a maximum output power and output density of 209.4 nW and 141.5 mW/cm^(2) at a temperature gradient of 30.3 K.This work provides a facile method to prepare thermoelectric materials for flexible thermoelectric generators.
