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Enhanced Thermoelectric Properties and Increased Thermal Stability of Superionic Cu 2S by Excessive Iodine Doping

32 Pages Posted: 13 Dec 2018 Sneak Peek Status: Under Review

See all articles by Shijie Zhao

Shijie Zhao

Chinese Academy of Sciences (CAS) - CAS Key Laboratory of Low-Carbon Conversion Science and Engineering

Haiyan Chen

Chinese Academy of Sciences (CAS) - CAS Key Laboratory of Low-Carbon Conversion Science and Engineering

Xiaohui Zhao

Chinese Academy of Sciences (CAS) - CAS Key Laboratory of Low-Carbon Conversion Science and Engineering

Jun Luo

Shanghai University - School of Material Science and Engineering

Kang Yang

Chinese Academy of Sciences (CAS) - CAS Key Laboratory of Low-Carbon Conversion Science and Engineering

Zichen Wei

Chinese Academy of Sciences (CAS) - CAS Key Laboratory of Low-Carbon Conversion Science and Engineering

Xiaoyuan Chen

Chinese Academy of Sciences (CAS) - CAS Key Laboratory of Low-Carbon Conversion Science and Engineering

Yuhan Sun

Chinese Academy of Sciences (CAS) - CAS Key Lab of Low-Carbon Conversion Science and Engineering

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Abstract

Highly disordered superionic phases lead to high thermoelectric performance (ZT~1.5) for Cu2M (M=S, Se, Te) alloys but bring challenges concerning thermal instability. Here we demonstrate that enhanced thermoelectric properties and improved thermal stability could be simultaneously realized in Cu2S upon excessive I doping. The addition of excessive I beyond stoichiometric ratio not only induces higher Cu deficiency and thus better electrical properties for the prepared Cu2SIx (x=0–0.15) alloys, but also leads to ultra-low thermal conductivity ascribed to multiple superionic phases and abundant nano-crystals. As a result, a ZT value of 1.62 at 700°C is achieved for the sample x=0.10 (Cu2SI0.1), which is nearly twice the value of undoped Cu2S. Moreover, I doping eliminates the ultrafast phase transformation that results in abrupt volume changes in pristine Cu2S and suppresses the rest transformations to be very sluggish. The high ZT value together with significantly suppressed phase transitions and impeded copper segregation enable the excessively I-doped samples more beneficial for practical thermoelectric power generation.

Keywords: Superionic phase, thermal stability, phase transformation, thermoelectric properties, Cu2S

Suggested Citation

Zhao, Shijie and Chen, Haiyan and Zhao, Xiaohui and Luo, Jun and Yang, Kang and Wei, Zichen and Chen, Xiaoyuan and Sun, Yuhan, Enhanced Thermoelectric Properties and Increased Thermal Stability of Superionic Cu 2S by Excessive Iodine Doping (December 13, 2018). Available at SSRN: https://ssrn.com/abstract=3300046 or http://dx.doi.org/10.2139/ssrn.3300046
This is a paper under consideration at Cell Press and has not been peer-reviewed.

Shijie Zhao (Contact Author)

Chinese Academy of Sciences (CAS) - CAS Key Laboratory of Low-Carbon Conversion Science and Engineering

52 Sanlihe Rd.
Datun Road, Anwai
Beijing, Xicheng District 100864
China

Haiyan Chen

Chinese Academy of Sciences (CAS) - CAS Key Laboratory of Low-Carbon Conversion Science and Engineering ( email )

52 Sanlihe Rd.
Datun Road, Anwai
Beijing, Xicheng District 100864
China

Xiaohui Zhao

Chinese Academy of Sciences (CAS) - CAS Key Laboratory of Low-Carbon Conversion Science and Engineering

52 Sanlihe Rd.
Datun Road, Anwai
Beijing, Xicheng District 100864
China

Jun Luo

Shanghai University - School of Material Science and Engineering ( email )

149 Yanchang Road
SHANGDA ROAD 99
Shanghai 200072, Shanghai 200444
China

Kang Yang

Chinese Academy of Sciences (CAS) - CAS Key Laboratory of Low-Carbon Conversion Science and Engineering

52 Sanlihe Rd.
Datun Road, Anwai
Beijing, Xicheng District 100864
China

Zichen Wei

Chinese Academy of Sciences (CAS) - CAS Key Laboratory of Low-Carbon Conversion Science and Engineering

52 Sanlihe Rd.
Datun Road, Anwai
Beijing, Xicheng District 100864
China

Xiaoyuan Chen

Chinese Academy of Sciences (CAS) - CAS Key Laboratory of Low-Carbon Conversion Science and Engineering

52 Sanlihe Rd.
Datun Road, Anwai
Beijing, Xicheng District 100864
China

Yuhan Sun

Chinese Academy of Sciences (CAS) - CAS Key Lab of Low-Carbon Conversion Science and Engineering ( email )

52 Sanlihe Rd.
Datun Road, Anwai
Beijing, Xicheng District 100864
China

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