Dielectric microspacers (DMS) are important components in thermal energy converters. Engineered DMS are fabricated and characterized on different substrates by depositing patterned ceramic thin films of alumina (Al2O3) and zirconia (ZrO2) with a thickness ranging from 0.3 to 3 μm. Both Al2O3 and ZrO2 films are electrically and thermally optimized, finding zirconia more suitable as a thermal and electrical insulating material at high temperature, whereas the developed DMS are morphologically analyzed by scanning electron microscopy. The analysis of thermal simulations carried out with COMSOL Multiphysics allows identifying the best geometrical constraints for each single structure, whereas simulations carried out by the Fluent software allow identifying the best arrangement for DMS, leading to a solution with optimized pattern in terms of amount and spatial distribution so to achieve the required electrical and thermal insulation for practical applications. DMS are integrated within thermionic-photovoltaic devices to be validated experimentally, and enhanced electron emission measurements are successfully performed at a cathode temperature up to 1350 °C to verify the operational feasibility and potential of this technology.

Dielectric micro- and sub-micrometric spacers for high-temperature energy converters / Bellucci, A.; Sabbatella, G.; Girolami, M.; Mastellone, M.; Serpente, V.; Mezzi, A.; Kaciulis, S.; Paci, B.; Generosi, A.; Polini, R.; Vitulano, A.; Vivaldi, I.; Antonelli, M.; Trucchi, D. M.. - In: ENERGY TECHNOLOGY. - ISSN 2194-4288. - 9:1(2021), p. 2000788. [10.1002/ente.202000788]

Dielectric micro- and sub-micrometric spacers for high-temperature energy converters

Mastellone M.;
2021

Abstract

Dielectric microspacers (DMS) are important components in thermal energy converters. Engineered DMS are fabricated and characterized on different substrates by depositing patterned ceramic thin films of alumina (Al2O3) and zirconia (ZrO2) with a thickness ranging from 0.3 to 3 μm. Both Al2O3 and ZrO2 films are electrically and thermally optimized, finding zirconia more suitable as a thermal and electrical insulating material at high temperature, whereas the developed DMS are morphologically analyzed by scanning electron microscopy. The analysis of thermal simulations carried out with COMSOL Multiphysics allows identifying the best geometrical constraints for each single structure, whereas simulations carried out by the Fluent software allow identifying the best arrangement for DMS, leading to a solution with optimized pattern in terms of amount and spatial distribution so to achieve the required electrical and thermal insulation for practical applications. DMS are integrated within thermionic-photovoltaic devices to be validated experimentally, and enhanced electron emission measurements are successfully performed at a cathode temperature up to 1350 °C to verify the operational feasibility and potential of this technology.
dielectric materials; high-temperature energy converters; insulators; microspacers; thermionic energy converters
01 Pubblicazione su rivista::01a Articolo in rivista
Dielectric micro- and sub-micrometric spacers for high-temperature energy converters / Bellucci, A.; Sabbatella, G.; Girolami, M.; Mastellone, M.; Serpente, V.; Mezzi, A.; Kaciulis, S.; Paci, B.; Generosi, A.; Polini, R.; Vitulano, A.; Vivaldi, I.; Antonelli, M.; Trucchi, D. M.. - In: ENERGY TECHNOLOGY. - ISSN 2194-4288. - 9:1(2021), p. 2000788. [10.1002/ente.202000788]
File allegati a questo prodotto
File Dimensione Formato  
bellucci_dieletric_2021.pdf

solo gestori archivio

Tipologia: Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 6.79 MB
Formato Adobe PDF
6.79 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1493576
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 4
  • ???jsp.display-item.citation.isi??? 3
social impact