Improve thermoelectric performance of Bi2Te3 by incorporation of Mo2C MXene with N-type conductivity

作者：Guo, Yitong; Du, Jingyang; Hu, Meihua; Wei, Bin; Su, Taichao; Zhou, Aiguo^*

来源：Journal of Materials Science: Materials in Electronics , 2023, 34(7): 685.

DOI：10.1007/s10854-023-10064-y

• BISMUTH TELLURIDE BI2TE3
• ELECTRICAL-CONDUCTIVITY
• THERMAL-CONDUCTIVITY
• STABILITY
• COMPOSITE
• CARRIER

In this paper, the thermoelectric (TE) performance of Bi2Te3 was improved by the incorporation of Mo2C MXene, which is a novel two-dimensional material with moderate TE performance. The TE properties of Mo2C MXene were characterized from bulk samples bonded with 5 wt% Al sintered by spark plasma sintering (SPS) at 623 K for 6 min. Due to the very weak TE performance of Al, the performance of Mo2C MXene/Al composite reflects that of Mo2C MXene. It is an N-type conductor with the Seebeck coefficient of - 9.25 mu V/K at 600 K. This is the first report to characterize the TE performance of Mo2C MXene bulk samples. Thereafter, Bi2Te3/Mo2C MXene composite powders were prepared from Mo2C MXene powers and precursors of Bi2Te3 by hydrothermal method at 453 K for 24 h. The bulk samples of Bi2Te3 incorporated with Mo2C MXene was obtained by SPS at 523 K for 7 min. The composites are N-type conductors. The electrical conductivity was remarkably increased with the content of Mo2C MXene, while the thermal conductivity slightly decreased. The sample with 5 vol% Mo2C MXene showed the optimal thermoelectric properties, and its ZT value was 0.26 at 473 K. At 450 K, the ZT value (similar to 0.25) of that sample was 78.6% higher than that of Bi2Te3 (similar to 0.14). This is the first report on regulating TE performance by the incorporation of Mo2C MXene, a 2D material with intrinsic TE performance.

• 单位
  桂林理工大学