Kovalevsky, Andrei V. ; Zakharchuk, Kiryl V. ; Aguirre, Myriam H. ; Xie, Wenjie ; Patrício, Sonia G. ; Ferreira, Nuno M. ; Lopes, Diogo ; Sergiienko, Sergii A. ; Constantinescu, Gabriel ; Mikhalev, Sergey M. ; Weidenkaff, Anke ; Frade, Jorge R. (2020)
Redox engineering of strontium titanate-based thermoelectrics.
In: Journal of Materials Chemistry A, 8 (15)
doi: 10.1039/c9ta13824b
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The development of thermoelectrics for high-temperature applications imposes several essentialrequirements on the material properties. In some energy-conversion scenarios, the cost and thermalstability requirements may dominate over efficiency issues, making abundant, high-temperature-stableand low-toxic oxides attractive alternative thermoelectric materials. As compared to“traditional”thermoelectrics, oxides possess unique redoxflexibility and defect chemistry, which can be preciselytuned by external temperature and oxygen partial pressure conditions. This work aims to demonstratehow, by redox-sensitive substitutions, the thermoelectric properties of oxides can be tuned andenhanced. The proposed strategy is exemplified by considering molybdenum-containing strontiumtitanate within nominally single-substituted and nanocomposite concepts. The involved materials designallows us to proceed from an in-depth understanding of the redox-promoted effects to thedemonstration of the enhanced thermoelectric performance attained by redox engineering. Synergisticenhancement of the Seebeck coefficient and suppression of the thermal conductivity due to combinedcarrierfiltering effects and efficient phonon scattering at redox-induced interfaces provided up to 25%increase in the thermoelectric performance. The results demonstrate extraordinaryflexibility of theperovskite lattice towards retaining a rich combination of the molybdenum redox states and shifting theirratio by tuning the A-site stoichiometry, and the prospects for developing new materials combiningthermoelectric and (electro)catalytic functionalities.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2020 |
| Autor(en): | Kovalevsky, Andrei V. ; Zakharchuk, Kiryl V. ; Aguirre, Myriam H. ; Xie, Wenjie ; Patrício, Sonia G. ; Ferreira, Nuno M. ; Lopes, Diogo ; Sergiienko, Sergii A. ; Constantinescu, Gabriel ; Mikhalev, Sergey M. ; Weidenkaff, Anke ; Frade, Jorge R. |
| Art des Eintrags: | Bibliographie |
| Titel: | Redox engineering of strontium titanate-based thermoelectrics |
| Sprache: | Englisch |
| Publikationsjahr: | 14 März 2020 |
| Verlag: | Royal Society of Chemistry |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Materials Chemistry A |
| Jahrgang/Volume einer Zeitschrift: | 8 |
| (Heft-)Nummer: | 15 |
| DOI: | 10.1039/c9ta13824b |
| Kurzbeschreibung (Abstract): | The development of thermoelectrics for high-temperature applications imposes several essentialrequirements on the material properties. In some energy-conversion scenarios, the cost and thermalstability requirements may dominate over efficiency issues, making abundant, high-temperature-stableand low-toxic oxides attractive alternative thermoelectric materials. As compared to“traditional”thermoelectrics, oxides possess unique redoxflexibility and defect chemistry, which can be preciselytuned by external temperature and oxygen partial pressure conditions. This work aims to demonstratehow, by redox-sensitive substitutions, the thermoelectric properties of oxides can be tuned andenhanced. The proposed strategy is exemplified by considering molybdenum-containing strontiumtitanate within nominally single-substituted and nanocomposite concepts. The involved materials designallows us to proceed from an in-depth understanding of the redox-promoted effects to thedemonstration of the enhanced thermoelectric performance attained by redox engineering. Synergisticenhancement of the Seebeck coefficient and suppression of the thermal conductivity due to combinedcarrierfiltering effects and efficient phonon scattering at redox-induced interfaces provided up to 25%increase in the thermoelectric performance. The results demonstrate extraordinaryflexibility of theperovskite lattice towards retaining a rich combination of the molybdenum redox states and shifting theirratio by tuning the A-site stoichiometry, and the prospects for developing new materials combiningthermoelectric and (electro)catalytic functionalities. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Werkstofftechnik und Ressourcenmanagement |
| Hinterlegungsdatum: | 22 Mai 2020 08:01 |
| Letzte Änderung: | 22 Mai 2020 08:01 |
| PPN: | |
| Projekte: | This work was supported by the project CICECO-Aveiro Instituteof Materials (ref. UIDB/50011/2020 & UIDP/50011/2020) and theproject POCI-01-0145-FEDER-031875,, nanced by COMPETE2020 Program and National Funds through the FCT/MEC andwhen applicable co-nanced by FEDER under the PT2020Partnership Agreement,, y the project UID/EMS/00481/2019-FCT and by Centro 2020, through the European RegionalDevelopment Fund (ERDF),, in the scope of the project CENTRO-01-0145-FEDER-022083. |
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