Performance boost for bismuth telluride thermoelectric generator via barrier layer based on low Young’s modulus and particle sliding

Author:

Sun Yuxin,Guo FengkaiORCID,Feng YanORCID,Li Chun,Zou Yongchun,Cheng Jinxuan,Dong Xingyan,Wu Hao,Zhang QianORCID,Liu WeishuORCID,Liu ZihangORCID,Cai Wei,Ren ZhifengORCID,Sui JieheORCID

Abstract

AbstractThe lack of desirable diffusion barrier layers currently prohibits the long-term stable service of bismuth telluride thermoelectric devices in low-grade waste heat recovery. Here we propose a new design principle of barrier layers beyond the thermal expansion matching criterion. A titanium barrier layer with loose structure is optimized, in which the low Young’s modulus and particle sliding synergistically alleviates interfacial stress, while the TiTe2 reactant enables metallurgical bonding and ohmic contact between the barrier layer and the thermoelectric material, leading to a desirable interface characterized by high-thermostability, high-strength, and low-resistivity. Highly competitive conversion efficiency of 6.2% and power density of 0.51 W cm−2 are achieved for a module with leg length of 2 mm at the hot-side temperature of 523 K, and no degradation is observed following operation for 360 h, a record for stable service at this temperature, paving the way for its application in low-grade waste heat recovery.

Funder

National Natural Science Foundation of China

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry,Multidisciplinary

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