Article Dans Une Revue Acta Materialia Année : 2025

Steric confinement for suppressing ion migration and boosting thermoelectric performance in Cu–S system via Ag and Se co-doping

Résumé

The Cu-S superionic compound exhibits excellent thermoelectric (TE) performance in the mid-temperature region. However, obtaining a thermally and electrically stable material in this system is still challenging. Herein, motivated by the perspective of steric confinement for suppressing Cu+ migration, we designed an Ag and Ag-Se co-doping strategy on pristine Cu1.93S to modulate the crystal structure. On one hand, Ag dopant is discovered to act as a vacancy filler, simultaneously optimizing carrier concentration and reducing thermal conductivity. Moreover, strategic Se co-substitution stabilizes Ag insertion within the Cu-S vacancy and induces non-negligible enhancement of phonon scattering to further reduce thermal conductivity. A competitive peak zT of 1.33@873 K was obtained for the Cu1.93Ag0.04S0.9Se0.1 sample at a relatively moderate temperature among current state-of-the-art Cu-S system. Moreover, thanks to the steric confinement, the Cu1.93Ag0.04S0.9Se0.1 composition exhibited superior electrical stability under dynamic DC-current compared to CuxS (with 1.93

Fichier principal
Vignette du fichier
1-s2.0-S1359645425007104-main.pdf (5.24 Mo) Télécharger le fichier
Origine Publication financée par une institution
Licence

Dates et versions

hal-05262532 , version 1 (16-09-2025)

Licence

Identifiants

Citer

Xinyuan Wang, Cédric Bourgès, Jean-Claude Crivello, Takao Mori. Steric confinement for suppressing ion migration and boosting thermoelectric performance in Cu–S system via Ag and Se co-doping. Acta Materialia, 2025, 299, pp.121424. ⟨10.1016/j.actamat.2025.121424⟩. ⟨hal-05262532⟩
177 Consultations
170 Téléchargements

Altmetric

Partager

  • More