MilliporeSigma
  • Home
  • Search Results
  • Solvothermal Synthesis of Tetrahedrite: Speeding Up the Process of Thermoelectric Material Generation.

Solvothermal Synthesis of Tetrahedrite: Speeding Up the Process of Thermoelectric Material Generation.

ACS applied materials & interfaces (2015-10-20)
Derak J James, Xu Lu, Donald T Morelli, Stephanie L Brock
ABSTRACT

Derivatives of synthetic tetrahedrite, Cu12Sb4S13, are receiving increasing attention in the thermoelectric community due to their exploitation of plentiful, relatively nontoxic elements, combined with a thermoelectric performance that rivals that of PbTe-based compounds. However, traditional synthetic methods require weeks of annealing at high temperatures (450-600 °C) and periodic regrinding of the samples. Here we report a solvothermal method to produce tetrahedrite that requires only 1 day of heating at a relatively low temperature (155 °C). This allows preparation of multiple samples at once and is potentially scalable. The solvothermal material described herein demonstrates a dimensionless figure of merit (ZT) vs temperature curve comparable to that of solid-state tetrahedrite, achieving the same ZT of 0.63 at ∼720 K. As with the materials from solid-state synthesis, products from this rapid solvothermal synthesis can be improved by mixing in a 1:1 molar ratio with the Zn-containing natural mineral, tennantite, to achieve 0.9 mol equiv of Zn. This leads to a 36% increase in ZT at ∼720 K for solvothermal tetrahedrite, to 0.85.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Copper(I) chloride, ≥99.995% trace metals basis
Sigma-Aldrich
Copper(I) chloride, puriss. p.a., ACS reagent, ≥97.0% (RT)
Sigma-Aldrich
Copper(I) chloride, reagent grade, 97%
Sigma-Aldrich
Copper(I) chloride, ReagentPlus®, purified, ≥99%
Sigma-Aldrich
Copper(I) chloride, AnhydroBeads, ≥99.99% trace metals basis
Sigma-Aldrich
Ethylenediamine solution, technical, 75-80%
Sigma-Aldrich
Ethylenediamine, meets USP testing specifications
Sigma-Aldrich
Ethylenediamine, purified by redistillation, ≥99.5%
Sigma-Aldrich
Copper(II) nitrate hemi(pentahydrate), ACS reagent, ≥99.99% trace metals basis
Sigma-Aldrich
Ethylenediamine, ReagentPlus®, ≥99%
Sigma-Aldrich
Ethylenediamine, BioXtra
Sigma-Aldrich
Copper(II) nitrate hemi(pentahydrate), ACS reagent, 98%