Compositing effects for high thermoelectric performance of Cu2Se-based materials

Zhifang Zhou, Yi Huang, Bin Wei, Yueyang Yang, Dehong Yu, Yunpeng Zheng, Dongsheng He, Wenyu Zhang, Mingchu Zou, Jin-Le Lan (), Jiaqing He, Ce-Wen Nan and Yuan-Hua Lin ()
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Zhifang Zhou: Tsinghua University
Yi Huang: Southern University of Science and Technology
Bin Wei: Tsinghua University
Yueyang Yang: Tsinghua University
Dehong Yu: Australian Nuclear Science and Technology Organisation
Yunpeng Zheng: Tsinghua University
Dongsheng He: Southern University of Science and Technology
Wenyu Zhang: Tsinghua University
Mingchu Zou: Tsinghua University
Jin-Le Lan: Beijing University of Chemical Technology
Jiaqing He: Southern University of Science and Technology
Ce-Wen Nan: Tsinghua University
Yuan-Hua Lin: Tsinghua University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Thermoelectric materials can realize direct conversion between heat and electricity, showing excellent potential for waste heat recovery. Cu2Se is a typical superionic conductor thermoelectric material having extraordinary ZT values, but its superionic feature causes poor service stability and low mobility. Here, we reported a fast preparation method of self-propagating high-temperature synthesis to realize in situ compositing of BiCuSeO and Cu2Se to optimize the service stability. Additionally, using the interface design by introducing graphene in these composites, the carrier mobility could be obviously enhanced, and the strong phonon scatterings could lead to lower lattice thermal conductivity. Ultimately, the Cu2Se-BiCuSeO-graphene composites presented excellent thermoelectric properties with a ZTmax value of ~2.82 at 1000 K and a ZTave value of ~1.73 from 473 K to 1000 K. This work provides a facile and effective strategy to largely improve the performance of Cu2Se-based thermoelectric materials, which could be further adopted in other thermoelectric systems.

Date: 2023
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DOI: 10.1038/s41467-023-38054-y

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