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

Saruhan-Brings, Bilge and Nahirniak, Svitlana and Alkan, Gözde and 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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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.

Item URL in elib:https://elib.dlr.de/187619/
Document Type:Conference or Workshop Item (Speech)
Title:Processing of Rh-doped perovskite protective filters for selective gas sensing
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Saruhan-Brings, BilgeUNSPECIFIEDhttps://orcid.org/0000-0001-6895-8387UNSPECIFIED
Nahirniak, SvitlanaUNSPECIFIEDhttps://orcid.org/0000-0001-5252-8737UNSPECIFIED
Mechnich, PeterUNSPECIFIEDhttps://orcid.org/0000-0003-4689-8197UNSPECIFIED
Date:July 2022
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:BaTiO3, perovskite, gas sensing, micro-granulation, sacrificial processing
Event Title:Ceramics in Europe 2022
Event Location:Krakow, Poland
Event Type:international Conference
Event Start Date:10 July 2022
Event End Date:14 July 2022
Organizer:International Ceramic Federation; Polskie Towarzystwo Ceramiczne PTCer – Polish Ceramic Society; European Ceramic Society AISBL
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Clean Propulsion
DLR - Research area:Aeronautics
DLR - Program:L CP - Clean Propulsion
DLR - Research theme (Project):L - Advanced Materials and New Manufacturing Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Institute of Materials Research > Structural and Functional ceramics
Deposited By: Nahirniak, Svitlana
Deposited On:24 Aug 2022 08:46
Last Modified:24 Apr 2024 20:49

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