Interface and Surface Engineering Realized High Efficiency of 13% and Improved Thermal Stability in Mg3Sb1.5Bi0.5-Based Thermoelectric Generation Devices

Wu，Xinzhi1; Lin，Yangjian2; Han，Zhijia1; Li，Huan1; Liu，Chengyan1; Wang，Yupeng1; Zhang，Pengxiang1; Zhu，Kang1; Jiang，Feng1; Huang，Jian1; Fan，Haohan1,2; Cheng，Feng2; Ge，Binghui2; Liu，Weishu1,3

2022

10.1002/aenm.202203039

Advanced Energy Materials   Impact Factor & Quartile

1614-6832

1614-6840

Realizing high-temperature thermal stability in thermoelectric (TE) generators is a critical challenge. In this study, a synergistic interface and surface optimization strategy is implemented to enhance MgSbBi TE generator performance by employing FeCrTiMnMg thermoelectric interface materials and the MgMn-based alloy protective coating. The competitive output power density (ω) of 1.7 W cm and a conversion efficiency (η) of 13% for the single-leg device are achieved at hot-side temperature (T) and cold-side temperature (T) of 500 and 5 °C, respectively. An ω of 0.8 W cm and η of 6% for the two-couple TE devices with p-type commercial BiTe are also realized, values that are competitive with the commercial BiTe device. Additionally, the single-leg device shows a high stable η for over 100 h when the T and T are 400 and 5 °C, respectively, with an change rate (Δη/η,) of <3%. In situ transmission electron microscopy analysis further reveals that the high stability results from the effectively sluggish interdiffusion and reduced Mg evaporation that decrease the chemical potential gradient, reduce the saturated vapor pressure, and increase the diffusion activation energy barrier. This study provides a general technique route for boosting the high-temperature thermal stability of TE generator.

electrode contact interfaces high thermal stability Mg 3Sb 2 surface protective coatings thermoelectric power generators

SCI

English

First ; Corresponding

WOS:000879284200001

2-s2.0-85141477045

Scopus

1.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Information Materials and Intelligent Sensing Laboratory of Anhui Province,Institutes of Physical Science and Information Technology,Anhui University,Hefei,Anhui,230601,China
3.Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China

Wu，Xinzhi,Lin，Yangjian,Han，Zhijia,et al. Interface and Surface Engineering Realized High Efficiency of 13% and Improved Thermal Stability in Mg3Sb1.5Bi0.5-Based Thermoelectric Generation Devices[J]. Advanced Energy Materials,2022.

Wu，Xinzhi.,Lin，Yangjian.,Han，Zhijia.,Li，Huan.,Liu，Chengyan.,...&Liu，Weishu.(2022).Interface and Surface Engineering Realized High Efficiency of 13% and Improved Thermal Stability in Mg3Sb1.5Bi0.5-Based Thermoelectric Generation Devices.Advanced Energy Materials.

Wu，Xinzhi,et al."Interface and Surface Engineering Realized High Efficiency of 13% and Improved Thermal Stability in Mg3Sb1.5Bi0.5-Based Thermoelectric Generation Devices".Advanced Energy Materials (2022).