Title: SMART catalyst based on doped Sr-titanite for advanced SOFC anodes
Authors : Burnat, Dariusz
Kontic, Roman
Holzer, Lorenz
Schuler, Andreas
Mai, Andreas
Heel, Andre
Proceedings: Proceedings of 12th European SOFC & SOE Forum 2016
Pages : 113
Pages to: 120
Conference details: 12th European SOFC & SOE Forum, Lucerne, 5-8 July 2016
Issue Date: 2016
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Abstract)
Language : English
Subjects : Anodes; Perovskite; Smart Material; SOFC
Subject (DDC) : 621.3: Electrical engineering and electronics
Abstract: To increase the durability of SOFC stacks, robust anodes with high catalytic performance and redox tolerance are needed. Among all alternatives, La-doped strontium titanate (LST) materials were recognized to possess good electronic conductivity and high tolerance to redox cycles1,2, but modest electro-catalytic activity, which can be enhanced in conjunction with an appropriate catalyst. Nevertheless, anodes with conventional composite microstructures (e.g. LST with equally sized Ni-phase) are still prone to sulphur poisoning, coking and to coalescence of the Ni phase over time. The authors present recent advances of a SMART material concept with a catalytic and microstructural self-regeneration effect, in which nanosized nickel catalyst is repeatedly exsolved from and incorporated back into the LST perovskite host structure. Ni-nanoparticles are exsolved from LST at low pO2 (i.e. at SOFC anode conditions) and the Ni is re-incorporated hat high pO2. Since titanates are highly tolerant to changes of the oxygen partial pressure, application of controlled redox cycles could therefore lead to the burn-off of harmful sulphides and/or carbon deposits and at the same time the incorporation-exsolution cycles also help circumventing the catalysts coarsening problem. We present the concept in which Ni-doped LST is applied to repetitively exsolute and re-incorporate the Ni catalyst, hence offering a microstructural self-regeneration mechanism.
Further description : B1403
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Institute of Materials and Process Engineering (IMPE)
Publication type: Conference Paper
ISBN: 978-3-905592-21-4
URI: https://digitalcollection.zhaw.ch/handle/11475/8921
Published as part of the ZHAW project : SERAN - Self-Regenerating Anodes: Durability Improvement of SOFC Technology by Novel Smart Materials with Sulphur Tolerance
Appears in Collections:Publikationen School of Engineering

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