Toppling the Transport Properties with Cationic Overstoichiometry in Thermoelectric Colusite: [Cu 26 Cr 2 Ge 6 ] 1+δ S 32 - Université de Rennes Accéder directement au contenu
Article Dans Une Revue ACS Applied Energy Materials Année : 2020

Toppling the Transport Properties with Cationic Overstoichiometry in Thermoelectric Colusite: [Cu 26 Cr 2 Ge 6 ] 1+δ S 32

Résumé

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.
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Dates et versions

hal-02886485 , version 1 (03-09-2020)

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Gabin Guelou, Ventrapati Pavan Kumar, Abdelhamid Bourhim, Pierric Lemoine, Bernard Raveau, et al.. Toppling the Transport Properties with Cationic Overstoichiometry in Thermoelectric Colusite: [Cu 26 Cr 2 Ge 6 ] 1+δ S 32. ACS Applied Energy Materials, 2020, 3 (5), pp.4180-4185. ⟨10.1021/acsaem.0c00726⟩. ⟨hal-02886485⟩
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