Study on the thermoelectric properties of steel woolenhanced by Bi2Te3/KOH/PEDOT∶PSS and SiO2 aerogel
It is generally believed that the Seebeck coefficient of metals is low in the research field of thermoelec-tric materials.Therefore,few studies have been reported on the thermoelectric properties of metals.However,this study found that the physical form of metals may have effect on their thermoelectric properties.In this study,the thermoelectric properties of steel wool(SW)were investigated.It was found that the Seebeck coeffi-cient of SW,whose main component was Fe,was twice that of bulk iron.On this basis,steel wool was com-pounded with organic and inorganic thermoelectric materials and its voids were filled with SiO2 aerogel.Finally,a composite of Bi2Te3/KOH/PEDOT∶PSS@SW-SiO2 was prepared.A significant improvement in thermoelec-tric properties was observed compared to bare SW.The results show that the addition of aerogel can reduce the thermal conductivity of SW by 34％.The electrical conductivity(σ),thermal conductivity(κ)and Seebeck coef-ficient(S)have been decoupled.The Seebeck coefficient,thermoelectric merit value(ZT)and power factor(PF)of Bi2Te3/KOH/PEDOT∶PSS@SW-SiO2 are 1.2,3.4 and 2.4 times as large as that of bare SW,respec-tively.The way to improve the thermoelectric properties of the material by changing the physical morphology of the material and decoupling σ,κ and S is expected to provide new ideas for the research of other thermoelectric materials.
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