Abstract
Two commercial hybrid coatings, cured at temperatures lower than 300 °C, were successfully used to protect magnesium silicide stannide and zinc-doped tetrahedrite thermoelectrics. The oxidation rate of magnesium silicide at 500 °C in air was substantially reduced after 120 h with the application of the solvent-based coating and a slight increase in power factor was observed. The water-based coating was effective in preventing an increase in electrical resistivity for a coated tethtraedrite, preserving its power factor after 48 h at 350 °C.
Highlights
Thermoelectric materials are able to convert thermal gradient into electricity and recover energy from waste heat [1,2]
One of the main challenges in the thermoelectrics field is the identification of efficient materials that are inexpensive, easy to be produced, and formed of earth-abundant and environmentally friendly elements
We investigated the potential of two commercial hybrid coatings with nominal temperature resistance up to 590 ◦ C
Summary
Thermoelectric materials are able to convert thermal gradient into electricity and recover energy from waste heat [1,2] They are, usually, semiconductors or intermetallics, often containing elements such as Mg, Pb, Te, Bi, Mn, Ge, Si, Sb, Co or In [3,4,5,6,7]. One of the main challenges in the thermoelectrics field is the identification of efficient materials that are inexpensive, easy to be produced, and formed of earth-abundant and environmentally friendly elements. In this respect, magnesium silicide [15] and tetrahedrite [16] are considered attractive and sustainable candidates for n and p-type thermoelectrics, respectively. One important aspect for the development of high temperature thermoelectric generators is their long-term stability in air at high temperature [17]
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