Toppling the Transport Properties with Cationic Overstoichiometry in Thermoelectric Colusite: [Cu26Cr2Ge6]1+δS32

Gabin Guélou, Ventrapati Pavan Kumar, Abdelhamid Bourhim, Pierric Lemoine, Bernard Raveau, Andrew Supka, Oleg I. Lebedev, Rabih Al Rahal Al Orabi, Marco Fornari, Koichiro Suekuni, Emmanuel Guilmeau

Research output: Contribution to journalArticle

Abstract

The excellent thermoelectric properties of colusite are known to be closely related to the nature of the cations at the core of the tetrahedral-octahedral complexes. Here, we demonstrate that cation overstoichiometry decreases the carrier concentration and also generates structural disorder, which modify the conduction mechanism in a way that resembles the effect of cation-size mismatch. This functionalization of the "Cu26S32" conductive network leads to a high figure of merit of 1.0 at 700 K. This study highlights the importance of the cationic arrangement and furthers our understanding on the fascinating transport properties in colusite.

Original languageEnglish
Pages (from-to)4180-4185
Number of pages6
JournalACS Applied Energy Materials
Volume3
Issue number5
DOIs
Publication statusPublished - May 26 2020

All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

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    Guélou, G., Pavan Kumar, V., Bourhim, A., Lemoine, P., Raveau, B., Supka, A., Lebedev, O. I., Al Rahal Al Orabi, R., Fornari, M., Suekuni, K., & Guilmeau, E. (2020). Toppling the Transport Properties with Cationic Overstoichiometry in Thermoelectric Colusite: [Cu26Cr2Ge6]1+Î&acute;S32. ACS Applied Energy Materials, 3(5), 4180-4185. https://doi.org/10.1021/acsaem.0c00726