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Title: Highly Porous Thermoelectric Nanocomposites with LowThermalConductivityand High Figure of Merit from Large-Scale Solution-Synthesized Bi2Te2.5Se0.5HollowNanostructures

In order to enhance the performance of thermoelectric materials and enable access to their widespread applications, it is beneficial yet challenging to synthesize hollow nanostructures in large quantities, with high porosity, low thermal conductivity (κ) and excellent figure of merit (z T). We report a scalable (ca. 11.0 g per batch) and low-temperature colloidal processing route for Bi 2Te 2.5Se 0.5 hollow nanostructures. They are sintered into porous, bulk nanocomposites (phi 10 mm×h 10 mm) with low κ (0.48 W m -1 K -1) and the highest z T (1.18) among state-of-the-art Bi 2Te 3-xSe x materilas. Additional benefits of the unprecedented low relative density (68–77 %) are the large demand reduction of raw materials and the improved portability. This method can be adopted to fabricate other porous phase-transition and thermoelectric chalcogenide materials and will pave the way for the implementation of hollow nanostructures in other fields.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [3] ;  [4] ;  [1] ;  [2]
  1. Iowa State Univ., Ames, IA (United States). Dept. of Chemical and Biological Engineering
  2. (United States). Dept. of Energy
  3. Purdue Univ., West Lafayette, IN (United States). Dept. of Mechanical Engineering
  4. Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering
  5. Ames Lab., Ames, IA (United States). Dept. of Energy
Publication Date:
Report Number(s):
IS-J 9307
Journal ID: ISSN 0044-8249
Grant/Contract Number:
N00014-16-1-2066; HR0011-15-2-0037; SC0001299; AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
Angewandte Chemie
Additional Journal Information:
Journal Volume: 129; Journal Issue: 13; Journal ID: ISSN 0044-8249
Publisher:
German Chemical Society
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; hollow; nanostructures; porous; thermal conductivity; thermoelectric
OSTI Identifier:
1355755
Alternate Identifier(s):
OSTI ID: 1400464