Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Sulfur poisoning recovery on a solid oxide fuel cell anode material through reversible segregation of nickel
Authors: Steiger, Patrick
Madi, Hossein
Mai, Andreas
Holzer, Lorenz
Van Herle, Jan
Kröcher, Oliver
Heel, Andre
Ferri, Davide
et. al: No
DOI: 10.1021/acs.chemmater.8b03669
Published in: Chemistry of Materials
Volume(Issue): 31
Issue: 3
Pages: 748
Pages to: 758
Issue Date: 2019
Publisher / Ed. Institution: American Chemical Society
ISSN: 0897-4756
1520-5002
Language: English
Subject (DDC): 620.11: Engineering materials
Abstract: The perovskite-type mixed oxide La0.3Sr0.55Ti0.95Ni0.05O3−δ (LSTN) is demonstrated to exhibit the remarkable property of structural regeneration, where Ni can be reversibly exsoluted from the host perovskite lattice resulting in a regenerable Ni catalyst for solid oxide fuel cell anode applications. Results of catalytic tests for the water gas shift reaction and electrochemical investigations on a button-sized fuel cell demonstrate the redox stability of LSTN, its potential application in solid oxide fuel cells, and its ability to recover catalytic activity completely after sulfur poisoning. Nickel segregation was characterized and quantified on powder samples by means of electron microscopy, X-ray diffraction, X-ray absorption spectroscopy, and temperature-programmed reduction–reoxidation cycles. Catalyst stability was much improved compared to impregnated Ni/La0.3Sr0.55TiO3−δ and Ni/Y0.08Zr0.92O2 anode materials. A full cell was tested under both open circuit voltage and polarized conditions, showing a stable cell voltage over redox cycles as well as periods of reverse potential and current overload. The area-specific resistance of the anode layer was as low as 0.58 Ω cm2 at 850 °C. This allows LSTN to be applied in redox-stable solid oxide fuel cell anodes and reversible segregation of Ni to be exploited for fast recovery from sulfur poisoning.
URI: https://digitalcollection.zhaw.ch/handle/11475/19424
Fulltext version: Published version
License (according to publishing contract): Licence according to publishing contract
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Appears in Collections:Publikationen School of Engineering

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