Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Gas Sensing Properties of Powder Prepared from Waste Thermoelectric Devices by Wet Reduction Process

  • So, Hyeongsub (Department of Energy Engineering, Dankook University) ;
  • Im, Dong-Ha (Nano Convergence Materials Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Jung, Hyunsung (Nano Convergence Materials Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Lee, Kun-Jae (Department of Energy Engineering, Dankook University)
  • Received : 2017.11.23
  • Accepted : 2017.12.11
  • Published : 2018.01.31
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Abstract

In this study, n-type $Bi_2Te_3$ in thermoelectric scrap is recovered through a wet reduction process. The recovered powder (tellurium) is grafted onto gas sensor in a new application that is not a thermoelectric device. Bismuth-rich powder is prepared by adding hydrazine when pH of the solution is brought to 13 using NaOH. The pH of the filtered solution was reduced using $HNO_3$, and then hydrazine was added to perform the re-reduction reaction. The tellurium-rich powder can be obtained through this reaction. The elemental analysis for these powders is confirmed by energy dispersive X-ray spectroscopy (EDS) analysis ; the successful separation of bismuth and tellurium is confirmed. Separated tellurium powder is mixed with DMF solvent and ethyl cellulose binder to confirm gas sensing properties. The tellurium paste was exposed in $NO_x$ atmosphere and exhibited a rapid reaction rate and recovery rate of less than 3 minutes for the gas.

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  1. Waste Recycling in Thermoelectric Materials vol.10, pp.19, 2018, https://doi.org/10.1002/aenm.201904159