Enhancement in thermoelectric performance of electrochemically deposited platinum-bismuth telluride nanocomposite

摘要

The study of the thermoelectric performance of electrodeposited Pt nanoparticles-bismuth telluride nanocomposites (Pt/Bi2Te3) film is presented in this paper. An electrolyte solution containing nitric acid and bismuth-telluride ions was mixed with various concentrations of Pt nanoparticles.1.0 wt% to 1.9 wt% of Pt nanoparticles in the composites have been successfully synthesized and their thermoelectric performances were investigated. It is found that at 1.9% of Pt nanoparticles weight percentage in the Bi2Te3 matrix, the power factor increased to 1.8 x 10(-3) W m(-1) K-2 which is more than twice higher than that of an electrodeposited pure Bi2Te3 film. Meanwhile, the evaluation on thermal conductivity of the composite shows promising improvement, which is more than 40% reduction as compared to the Bi2Te3 film. As a result, a higher ZT value of 0.61 is obtained for the Pt (1.9 wt%)/Bi2Te3 film which is approximately more than triple of ZT of the electrodeposited Bi2Te3 film at room temperature. (C) 2019 Elsevier Ltd. All rights reserved.