Thermoelectric Properties of Bi2Sr2CO2Oy/Cu2Se Composites

5th Annual International Workshop on Materials Science and Engineering

Li, Erying^1^2 ; Liu, Congbin^3 ; Song, Hongzhang^1

Key Laboratory of Material Physics of Ministry of Education, School of Physics and Engineering, Zhengzhou University, Zhengzhou

450052, China^1

Henan Nanyang No.5 Middle School, Nanang

473000, China^2

Jiangsu Rainfine Environmental Science and Technology Co., Ltd, Henan CO., Ltd, China^3

关键词: Bi2Sr2Co2Oy;    Dimensionless figure of merit;    Dispersants;    Doped sample;    Nano powders;    Power factors;    Solid state method;    Thermoelectric properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/585/1/012043/pdf
DOI  :  10.1088/1757-899X/585/1/012043

来源: IOP

【 摘 要 】

The Cu2Se nanopowder was fabricated by the hydrothermal synthesis, then the thermoelectric properties of Bi2Sr2Co2Oy + x wt% Cu2Se (x = 0.0, 0.25, 0.50, 0.75, 1.00, and 1.25) composites prepared by the solid state method were investigated from room temperature to 875 K. The Cu2Se dispersant with an appropriate amount played a significant role in decreasing resistivity. Although the Seebeck coefficients also decreased slightly, the power factors of the doped samples got significant improvement. Furthermore, the thermal conductivity was depressed apparently. Ultimately, the Bi2Sr2Co2Oy + 0.5 wt% Cu2Se sample showed a better dimensionless figure of merit (ZT) value of 0.14 at 875 K. Compared with the pure Bi2Sr2Co2Oy sample, it was improved about by 25.5%.