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Processing of Rh-doped perovskite protective filters for selective gas sensing

Saruhan-Brings, Bilge und Nahirniak, Svitlana und Alkan, Gözde und Mechnich, Peter (2022) Processing of Rh-doped perovskite protective filters for selective gas sensing. Ceramics in Europe 2022, 2022-07-10 - 2022-07-14, Krakow, Poland.

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Kurzfassung

Owing to its excellent properties, BaTiO3 is used for manufacturing of thermistors and dielectric ceramic capacitors, photocatalysis, and in gas sensing. The incorporation of precious metals into the perovskite structure enables the stabilization of BaTiO3 catalysts due to the self-healing mechanisms: the formation of well-dispersed metal nanoparticles under reducing conditions and re-incorporation of metal nanoparticles into the crystal lattice under oxidizing environments. This concept is successfully proven for gas sensing/monitoring of reformate products (CO and H2 ) and during hydrogen separation and purification. Significant decomposition of traditional SnO2 sensors under such reducing conditions necessitates the use of protective coatings to improve the performance as well as avoidance of sensing layer degradation. In this sense, the perovskite group of materials display several advantages such as: ease removal of oxygen, oxygen vacancies, electron mobility, and valence control that could improve gas sensing. This work reports on the synthesis of Rh-incorporated BaTiO3 by oxalate-assisted co-precipitation method and processing into microgranules for better application of protective filters on to gas sensors. The synthesis process was performed in two steps: (1) preparation of precursor solutions with following mixing; (2) co-precipitation by pouring an oxalic acid ethanol solution in the cationic precursor solution with subsequent precipitate filtration, drying and calcination. The micro-granulation process is carried out in a laboratory spray-dryer. Soluble organic polymers are added as processing-aids as well as sacrificial pore-formers that lead to a structural porosity that enhances gas diffusion within the Rh-incorporated BaTiO3 granulates.

elib-URL des Eintrags:https://elib.dlr.de/187619/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Processing of Rh-doped perovskite protective filters for selective gas sensing
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Saruhan-Brings, BilgeBilge.Saruhan (at) dlr.dehttps://orcid.org/0000-0001-6895-8387NICHT SPEZIFIZIERT
Nahirniak, SvitlanaSvitlana.Nahirniak (at) dlr.dehttps://orcid.org/0000-0001-5252-8737NICHT SPEZIFIZIERT
Alkan, GözdeGoezde.Alkan (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Mechnich, PeterPeter.Mechnich (at) dlr.dehttps://orcid.org/0000-0003-4689-8197NICHT SPEZIFIZIERT
Datum:Juli 2022
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:BaTiO3, perovskite, gas sensing, micro-granulation, sacrificial processing
Veranstaltungstitel:Ceramics in Europe 2022
Veranstaltungsort:Krakow, Poland
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:10 Juli 2022
Veranstaltungsende:14 Juli 2022
Veranstalter :International Ceramic Federation; Polskie Towarzystwo Ceramiczne PTCer – Polish Ceramic Society; European Ceramic Society AISBL
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Umweltschonender Antrieb
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L CP - Umweltschonender Antrieb
DLR - Teilgebiet (Projekt, Vorhaben):L - Werkstoffe und Herstellverfahren
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Hochtemperatur-und Funktionsschutzschichten
Institut für Werkstoff-Forschung > Struktur- und Funktionskeramik
Hinterlegt von: Nahirniak, Svitlana
Hinterlegt am:24 Aug 2022 08:46
Letzte Änderung:24 Apr 2024 20:49

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