Effect of the nanostructuration of skutterudite materials on their oxidation behaviours
| Autor: | Richard DREVET, Aranda, L., Benyahia, M., Kenfaui, D., Masschelein, P., Petitjean, C., Veys-Renaux, D., Berthod, P., David, N., Monnier, J., Dauscher, A., Alleno, E. |
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| Přispěvatelé: | Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Eurocorr 2016 Eurocorr 2016, Sep 2016, Montpellier, France Scopus-Elsevier |
| Popis: | International audience; Doped CoSb3-based skutterudites compounds such as Co0.94Ni0.06Sb3 and Ce0.75Fe3CoSb12 are promising thermoelectric materials thanks to a high figure of merit (ZT > 1). This property makes these doped CoSb3-based skutterudites interesting materials to produce thermoelectric generators able to convert heat into electrical energy. Several recent developments have established that the nanostructuration of these materials enhance their thermoelectrical properties. However, the impact of the nanostructuration on the oxidation behavior of the skutterudites has never been studied. Indeed, their operating temperature under oxidative atmosphere (e.g. in air environment) is drastically limited because of their strong oxidation that produces oxides layers made of Sb2O3, Sb2O4, CoSb2O6 or CoSb2O4. These reactions promote the degradation of the thermoelectric properties of the material and the decrease of the device durability. Therefore the objective of this research work is to determine the impact of the nanostructuration on the oxidation behavior of two interesting doped CoSb3-based skutterudites, Co0.94Ni0.06Sb3 and Ce0.75Fe3CoSb12.The oxidation of the n-type skutterudite material (Co0.94Ni0.06Sb3) is enhanced by its nanostructuration since the surface oxide layer formed remains very thin up to 1000 hours. The oxidation of the p-type material (Ce0.75Fe3CoSb12) depicts similar behaviors whatever the structuration (micro- or nano-). The nanostructuration of these thermoelectric materials is known to improve their thermoelectric properties. Since there is no significant negative effect on their oxidation behavior, these nanostructured thermoelectric materials are good candidates for industrial uses in air atmosphere at these temperatures. |
| Databáze: | OpenAIRE |
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