Structuration de générateurs thermoélectriques sur échangeur de type radiateur par électrodéposition

Abstract : In order to face the rarefaction of fossil fuels, the automotive industry has to find new ways to reduce their vehicle consumption. One of the possible ideas is to recover the energy that is lost as heating by using thermoelectricity. The aim of this work is to set-up thermoelectric generators into the radiator in order to recover this lost heat in a frame of research project financially supported by Valéo Systèmes Thermiques and ADEME. The radiator design requires thermoelectric materials thicknesses up to hundred micrometers in order to optimize the available space. Electroplating seems to be the best way to synthesize those materials directly onto the radiator fins. This study focuses on the electroplating of the best thermoelectric materials adapted to the operating temperatures of the heat exchanger: bismuth chalcogenides (Bi2Te3 and Bi0,5Sb1,5Te3). Firstly, a study has been carried out in order to synthesize thick layers above 100 µm of those two materials. Stoichiometry and thermoelectric properties were also determined. The original use of a soluble anode permitted to obtain 400 µm thick Bi2Te3 films. For the ternary compound, the synthesis consisting in a succession of thin layers of Bi0,25Sb0,75 and Te0, before their interdiffusion by annealing, is also presented. Finally, the last part covers the study carried out on the realization of the thermoelectric generators. The multiple stages of lithography and electrochemical syntheses were studied in order to obtain a module adapted to the heat exchanger. The first characterizations evidence high internal resistances and different ways to improve them are also presented
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Mathieu Maas. Structuration de générateurs thermoélectriques sur échangeur de type radiateur par électrodéposition. Autre. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0338⟩. ⟨tel-01754668⟩

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