Lattice Plainification and Intercalation Advances Power Generation and Thermoelectric Cooling in n-type Bi2(Te, Se)3

IF 24.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Advanced Energy Materials Pub Date : 2025-01-02 DOI:10.1002/aenm.202404653

Jiayi Peng, Dongrui Liu, Shulin Bai, Yi Wen, Huiqiang Liang, Lizhong Su, Xin Qian, Dongyang Wang, Xiang Gao, Zhihai Ding, Qian Cao, Yanling Pei, Bingchao Qin, Li-Dong Zhao

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Abstract

Bismuth telluride (Bi₂Te₃) has been the only commercialized material in thermoelectric cooling and waste heat recovery. However, the inferior performance for n-type Bi₂(Te, Se)₃ largely restricts the practical applications. In this study, additional Ag atoms are introduced utilizing lattice plainification strategy to enhance electrical performance. Observations indicate that Ag atoms situate in the van der Waals layers, acting as n-type dopants to increase carrier concentration, bonding with adjacent Te as intercalating atoms to form electron transport channels, while also suppressing the formation of Te vacancies to boost carrier mobility, substantially favoring carrier transport. Consequently, Bi₂Te_2.79Se_0.21I_0.004+0.3%Ag achieves an excellent room-temperature ZT of ≈1.1, while Bi₂Te2_.79Se_0.21I_0.004 + 0.4%Ag demonstrates a higher average ZT of ≈1.1 at 300–523 K. Furthermore, a full-scale thermoelectric cooler using optimized Bi₂Te_2.79Se_0.21I_0.004+0.3%Ag combined with commercial p-type Bi_0.5Sb_1.5Te₃ has achieved a maximum cooling temperature difference (ΔT_max) of ≈68.3 K at 300 K and a larger ΔT_max of ≈84.8 K at 343 K. Additionally, the Bi₂Te_2.79Se_0.21I_0.004 + 0.4%Ag/Bi_0.5Sb_1.5Te₃-based power generator realizes a conversion efficiency of ≈6.0% under a ΔT of ≈240 K. These results outperform commercial Bi₂Te₃-based devices, illustrating the effectiveness of lattice plainification for Bi₂Te₃-based thermoelectrics.

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来源期刊

Advanced Energy Materials CHEMISTRY, PHYSICAL-ENERGY & FUELS

CiteScore

41.90

自引率

4.00%

发文量

889

审稿时长

1.4 months

期刊介绍： Established in 2011, Advanced Energy Materials is an international, interdisciplinary, English-language journal that focuses on materials used in energy harvesting, conversion, and storage. It is regarded as a top-quality journal alongside Advanced Materials, Advanced Functional Materials, and Small. With a 2022 Impact Factor of 27.8, Advanced Energy Materials is considered a prime source for the best energy-related research. The journal covers a wide range of topics in energy-related research, including organic and inorganic photovoltaics, batteries and supercapacitors, fuel cells, hydrogen generation and storage, thermoelectrics, water splitting and photocatalysis, solar fuels and thermosolar power, magnetocalorics, and piezoelectronics. The readership of Advanced Energy Materials includes materials scientists, chemists, physicists, and engineers in both academia and industry. The journal is indexed in various databases and collections, such as Advanced Technologies & Aerospace Database, FIZ Karlsruhe, INSPEC (IET), Science Citation Index Expanded, Technology Collection, and Web of Science, among others.