A scalable synthesis route for multiscale defect engineering in the sustainable thermoelectric quaternary sulfide Cu26V2Sn6S32 - Normandie Université Access content directly
Journal Articles Acta Materialia Year : 2020

A scalable synthesis route for multiscale defect engineering in the sustainable thermoelectric quaternary sulfide Cu26V2Sn6S32

Abstract

In recent years, thermoelectric materials inspired from the natural mineral colusite have emerged as a new class of environmentally-friendly copper-based sulfides composed of abundant elements. Herein, high performance bulk colusite Cu26V2Sn6S32 materials were synthesized using mechanical alloying and spark plasma sintering of low-cost industrial-grade metal sulfides. This new synthesis route has led to the formation of various types of nano-to-microscale defects, from local Sn-site structural disorder to nano-inclusions and vanadium-rich core-shell microstructures. These multiscale defects have a strong impact over phonon scattering, making it possible to reach ultra-low lattice thermal conductivity. Simultaneously, the electrical transport properties are impacted through variations in charge carrier concentration and effective mass, leading to a synergistical improvement of both electrical and thermal properties. The resulting power factor, over 1 mW m−1 K−2 above 623 K with an average value of 0.86 mW m−1 K−2 over the temperature range 300 ≤ T / K ≤ 650 K, is the highest reported for a germanium-free colusite to date. Our optimization strategy based on defect engineering in bulk materials is an exciting prospect for new low-cost thermoelectric systems.
Fichier principal
Vignette du fichier
Guélou et al-2020-A scalable synthesis route for multiscale defect engineering in the sustainable.pdf (2.02 Mo) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-02882105 , version 1 (09-07-2020)

Identifiers

Cite

Gabin Guelou, Christophe Couder, Abdelhamid Bourhim, Oleg Lebedev, Nina Daneu, et al.. A scalable synthesis route for multiscale defect engineering in the sustainable thermoelectric quaternary sulfide Cu26V2Sn6S32. Acta Materialia, 2020, 195, pp.229-239. ⟨10.1016/j.actamat.2020.05.039⟩. ⟨hal-02882105⟩
136 View
227 Download

Altmetric

Share

Gmail Facebook X LinkedIn More