Hierarchical Structures Advance Thermoelectric Properties of Porous n-type β-Ag2Se

Chen, Jie, Sun, Qiang, Bao, Deyu, Liu, Taoyi, Liu, Wei Di, Liu, Can, Tang, Jun, Zhou, Dali, Yang, Lei, & (2020) Hierarchical Structures Advance Thermoelectric Properties of Porous n-type β-Ag2Se. ACS Applied Materials and Interfaces, 12(46), pp. 51523-51529.

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Description

Owing to the intrinsically good near-room-temperature thermoelectric performance, β-Ag2Se has been considered as a promising alternative to n-type Bi2Te3 thermoelectric materials. Herein, we develop an energy- and time-efficient wet mechanical alloying and spark plasma sintering method to prepare porous β-Ag2Se with hierarchical structures including high-density pores, a metastable phase, nanosized grains, semi-coherent grain boundaries, high-density dislocations, and localized strains, leading to an ultralow lattice thermal conductivity of ∼0.35 W m–1 K–1 at 300 K. A relatively high carrier mobility is obtained by adjusting the sintering temperature to obtain pores with an average size of ∼260 nm, therefore resulting in a figure of merit, zT, of ∼0.7 at 300 K and ∼0.9 at 390 K. The single parabolic band model predicts that zT of such porous β-Ag2Se can reach ∼1.1 at 300 K if the carrier concentration can be tuned to ∼1 × 1018 cm–3, suggesting that β-Ag2Se can be a competitive candidate for room-temperature thermoelectric applications.

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ID Code: 228122
Item Type: Contribution to Journal (Journal Article)
Refereed: Yes
ORCID iD:
Chen, Zhi-Gangorcid.org/0000-0002-9309-7993
Additional Information: Funding Information: This work was supported by the National Natural Science Foundation of China (NSFC, Grant No.51802205), the Fundamental Research Funds for the Central Universities (Grant No. YJ201789), and the 1000 Talents Program of Sichuan Province. The authors thank Ms. Lingzhu Yu for SEM characterization at the National Engineering Research Center for Biomaterials, Sichuan University. The authors thank Ms. Yue Qi for XRD measurement at the comprehensive training platform of the Specialized Laboratory in the College of Chemistry, Sichuan University.
Measurements or Duration: 7 pages
Keywords: hierarchical structures, porous, room temperature, silver selenide, thermoelectric
DOI: 10.1021/acsami.0c15341
ISSN: 1944-8244
Pure ID: 105647040
Funding Information: This work was supported by the National Natural Science Foundation of China (NSFC, Grant No.51802205), the Fundamental Research Funds for the Central Universities (Grant No. YJ201789) and the 1000 Talents Program of Sichuan Province. The authors thank Ms. Lingzhu Yu for SEM characterization at the National Engineering Research Center for Biomaterials, Sichuan University. The authors thank Ms. Yue Qi for XRD measurement at the comprehensive training platform of the Specialized Laboratory in the College of Chemistry Sichuan University. This work was supported by the National Natural Science Foundation of China (NSFC, Grant No.51802205), the Fundamental Research Funds for the Central Universities (Grant No. YJ201789), and the 1000 Talents Program of Sichuan Province. The authors thank Ms. Lingzhu Yu for SEM characterization at the National Engineering Research Center for Biomaterials, Sichuan University. The authors thank Ms. Yue Qi for XRD measurement at the comprehensive training platform of the Specialized Laboratory in the College of Chemistry, Sichuan University.
Copyright Owner: 2020 American Chemical Society
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Deposited On: 15 Feb 2022 00:33
Last Modified: 02 Aug 2024 17:53