The reduction properties of M‐Doped (M=Zr, Gd) CeO2/YSZ scaffolds co‐infiltrated with nickel
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Supporting information
Author(s)
Type
Journal Article
Abstract
In recent years infiltration of materials into porous ceramic scaffolds has been shown to be an effective way of creating catalytically active components for solid oxide fuel cells (SOFCs). However, the redox properties of these novel structures are not well understood. Here, we use X‐ray photoelectron spectroscopy (XPS) and in‐situ Raman spectroscopy to investigate the oxidation properties of yttria‐stabilised zirconia (YSZ) scaffolds infiltrated with ceria (CeO2), gadolinium‐doped ceria (GDC) and zirconia‐doped ceria (ZDC), with and without Ni. XPS shows that doping ceria with zirconia increases the ratio of Ce3+ to Ce4+, while gadolinium doping results in a decrease of Ce3+. The presence of Ni increases the Ce3+/Ce4+ ratio for CeO2 and GDC, but had little effect on ZDC. We used the shift of the F2g Raman peak to monitor in‐situ, the oxidation state of ceria. In the as‐made compounds, we show that while the gadolinium and zirconium dopants significantly change the oxidation characteristics of ceria, the resulting materials are only significantly reduced above 500 °C when co‐infiltrated with Ni. In‐situ Raman monitoring during reduction as a function of temperature showed that while ZDC reduces much more readily than undoped ceria or GDC, the presence of Ni dominated the reduction dynamics.
Date Issued
2018-10-01
Date Acceptance
2018-04-24
Citation
Energy Technology, 2018, 6 (10), pp.2045-2052
ISSN
2194-4296
Publisher
Wiley-VCH Verlag
Start Page
2045
End Page
2052
Journal / Book Title
Energy Technology
Volume
6
Issue
10
Copyright Statement
© 2018 John Wiley & Sons Ltd. This is the pre-peer reviewed version of the following article: Maher, R. C., Kerherve, G. , Payne, D. J., Yue, X. , Connor, P. A., Irvine, J. and Cohen, L. F. (2018), The Reduction Properties of M‐Doped (M=Zr, Gd) CeO2/YSZ Scaffolds Co‐Infiltrated With Nickel. Energy Technol., which has been published in final form at https://dx.doi.org/10.1002/ente.201800146
Subjects
Science & Technology
Technology
Energy & Fuels
In-situ Raman
SOFC
Ceria
Infiltration
Reduction
OXIDE FUEL-CELLS
RAMAN-SPECTROSCOPY
SOLID-SOLUTIONS
CATALYTIC-PROPERTIES
LATTICE-PARAMETERS
IONIC-CONDUCTIVITY
VACANCY FORMATION
REDOX PROPERTIES
CERIA CERAMICS
SURFACES
Publication Status
Published
Date Publish Online
2018-09-11