Last two decades have witnessed significant progress in thermoelectric research, to which materials processing has crucial contributions. Compared with traditional zone-melting method used for fabricating bismuth tell...Last two decades have witnessed significant progress in thermoelectric research, to which materials processing has crucial contributions. Compared with traditional zone-melting method used for fabricating bismuth telluride alloys, new powder-based processes have more freedom for manipulating nanostructnres and nanocomposites. Thermoelectric performance enhancement is realized in most thermoelectric materials by introducing fine-grained and nano-composite structures with accurately controlled compositions. This review gives a comprehensive summary on the processing aspects of thermoelectric materials with three focuses on the powder synthesis, advanced sintering process and the formation of nanostructures in bulk materials.展开更多
A significant enhancement in the thermoelectric performance was observed for three-dimensional conducting aerogels,which were obtained from poly（3,4-ethylenedioxythiophene）：poly（4-styrenesulfonic）（PEDOTrPSS） an...A significant enhancement in the thermoelectric performance was observed for three-dimensional conducting aerogels,which were obtained from poly（3,4-ethylenedioxythiophene）：poly（4-styrenesulfonic）（PEDOTrPSS） and multiwalled carbon nanotubes（MWCNTs） suspensions by adding different concentrations of metallic silver（Ag）.It was found that the electrical conductivity and Seebeck coefficient could be simultaneously increased with the unique structure.Moreover,the conducting aerogels have an ultralow thermal conductivity（0.06 W m^（-1） K^（-1） and a large Brunauer-Emmett-Teller surface area（228 m^2 g^（-1）.The highest figure of merit（zT） value in this study was 7.56×10^（-3） at room temperature upon the addition of 33.32 wt.%Ag.Although the zT value was too low,our work may provide new insights into the design and development of the thermoelectric material for applications.Further investigation with PEDOTrPSS aerogels will be continued to get an economical,lightweight,and efficient polymer thermoelectric material.展开更多
High temperature electrical and thermal transport properties,that is,electrical conductivity,Seebeck coefficient and thermal conductivity,of CdO ceramics have been investigated.Because of the good electrical propertie...High temperature electrical and thermal transport properties,that is,electrical conductivity,Seebeck coefficient and thermal conductivity,of CdO ceramics have been investigated.Because of the good electrical properties and low thermal conductivity,the dimensionless figure-of-merit ZT of the CdO ceramics reaches 0.34 at 1023 K.This value is comparable to the best reported ZT for the n-type oxide ceramic thermoelectric materials and remains as potential to be further improved by porosity controlling or nanostructuring.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.11474176)the Ministry of Science and Technology of China(Grant No.2013CB632503)
文摘Last two decades have witnessed significant progress in thermoelectric research, to which materials processing has crucial contributions. Compared with traditional zone-melting method used for fabricating bismuth telluride alloys, new powder-based processes have more freedom for manipulating nanostructnres and nanocomposites. Thermoelectric performance enhancement is realized in most thermoelectric materials by introducing fine-grained and nano-composite structures with accurately controlled compositions. This review gives a comprehensive summary on the processing aspects of thermoelectric materials with three focuses on the powder synthesis, advanced sintering process and the formation of nanostructures in bulk materials.
基金supported by the National Natural Science Foundation of China(51303116)
文摘A significant enhancement in the thermoelectric performance was observed for three-dimensional conducting aerogels,which were obtained from poly（3,4-ethylenedioxythiophene）：poly（4-styrenesulfonic）（PEDOTrPSS） and multiwalled carbon nanotubes（MWCNTs） suspensions by adding different concentrations of metallic silver（Ag）.It was found that the electrical conductivity and Seebeck coefficient could be simultaneously increased with the unique structure.Moreover,the conducting aerogels have an ultralow thermal conductivity（0.06 W m^（-1） K^（-1） and a large Brunauer-Emmett-Teller surface area（228 m^2 g^（-1）.The highest figure of merit（zT） value in this study was 7.56×10^（-3） at room temperature upon the addition of 33.32 wt.%Ag.Although the zT value was too low,our work may provide new insights into the design and development of the thermoelectric material for applications.Further investigation with PEDOTrPSS aerogels will be continued to get an economical,lightweight,and efficient polymer thermoelectric material.
基金supported by the Natural Science Foundation for Distinguished Young Scholars of Hebei Province(Grant No.A2013201249)the National Natural Science Foundation of China(Grant No.51372064)
文摘High temperature electrical and thermal transport properties,that is,electrical conductivity,Seebeck coefficient and thermal conductivity,of CdO ceramics have been investigated.Because of the good electrical properties and low thermal conductivity,the dimensionless figure-of-merit ZT of the CdO ceramics reaches 0.34 at 1023 K.This value is comparable to the best reported ZT for the n-type oxide ceramic thermoelectric materials and remains as potential to be further improved by porosity controlling or nanostructuring.
