Enhanced Thermoelectric Performance of Cu2Se via Nanostructure and Compositional Gradient

Author:

Bo LinORCID,Li Fujin,Hou Yangbo,Zuo Min,Zhao DegangORCID

Abstract

Forming co-alloying solid solutions has long been considered as an effective strategy for improving thermoelectric performance. Herein, the dense Cu2−x(MnFeNi)xSe (x = 0–0.09) with intrinsically low thermal conductivity was prepared by a melting-ball milling-hot pressing process. The influences of nanostructure and compositional gradient on the microstructure and thermoelectric properties of Cu2Se were evaluated. It was found that the thermal conductivity decreased from 1.54 Wm−1K−1 to 0.64 Wm−1K−1 at 300 K via the phonon scattering mechanisms caused by atomic disorder and nano defects. The maximum zT value for the Cu1.91(MnFeNi)0.09Se sample was 1.08 at 750 K, which was about 27% higher than that of a pristine sample.

Funder

National Natural Science Foundation of China

Shandong Province Higher Educational Youth Innovative Science and Technology Program

Natural Science Foundation of Shandong Province

Publisher

MDPI AG

Subject

General Materials Science,General Chemical Engineering

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