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Title: Suppression of atom motion and metal deposition in mixed ionic electronic conductors

Journal Article · · Nature Communications
 [1]; ORCiD logo [2];  [3];  [3];  [4];  [4];  [5];  [6];  [2]; ORCiD logo [7];  [7];  [8];  [3];  [3];  [2]
  1. Chinese Academy of Sciences, Shanghai (China); None
  2. Northwestern Univ., Evanston, IL (United States)
  3. Chinese Academy of Sciences, Shanghai (China)
  4. Chinese Academy of Sciences, Shanghai (China); Univ. of Chinese Academy of Sciences, Beijing (China)
  5. Shanghai Univ., Shanghai (China)
  6. South Univ. of Science and Technology of China, Shenzhen (China)
  7. Justus-Liebig-Univ. Giessen, Giessen (Germany)
  8. Univ. of Michigan, Ann Arbor, MI (United States)

Many superionic mixed ionic–electronic conductors with a liquid-like sublattice have been identified as high efficiency thermoelectric materials, but their applications are limited due to the possibility of decomposition when subjected to high electronic currents and large temperature gradients. Here, through systematically investigating electromigration in copper sulfide/selenide thermoelectric materials, we reveal the mechanism for atom migration and deposition based on a critical chemical potential difference. Then, a strategy for stable use is proposed: constructing a series of electronically conducting, but ion-blocking barriers to reset the chemical potential of such conductors to keep it below the threshold for decomposition, even if it is used with high electric currents and/or large temperature differences. This strategy not only opens the possibility of using such conductors in thermoelectric applications, but may also provide approaches to engineer perovskite photovoltaic materials and the experimental methods may be applicable to understanding dendrite growth in lithium ion batteries.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0001299
OSTI ID:
1511492
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 9; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Thermoelectric power generation: from new materials to devices
  • Tan, Gangjian; Ohta, Michihiro; Kanatzidis, Mercouri G.
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 377, Issue 2152 https://doi.org/10.1098/rsta.2018.0450
journal July 2019