Abstract
Solid oxide fuel electrodes with pure GDC as the functional layer exhibit excellent kinetics, in line with mechanistic impedance modelling.
Highlights
In solid oxide fuel cell (SOFC) technology, morphological degradation, coking and moderate kinetics are known issues of state of the art nickel-yttria-stabilized zirconia (Ni-YSZ) cermet anodes.[1,2,3] Mixed ionic and electronic conductors are a promising alternative materials class for application in SOFC anodes, due to the increased number of electrochemically active sites and enhanced coking resistance
We show that powder-based anodes with pure Gd-doped ceria (GDC) functional layers exhibit excellent kinetics, and present a new easy to apply methodology to experimentally quantify the contributions of electron conduction, electrochemical reactions and gas diffusion kinetics to the overall polarization resistance
The impedance of symmetrical solid oxide model cells with pure GDC as anode functional layer was investigated in different gas phase and temperature conditions
Summary
In solid oxide fuel cell (SOFC) technology, morphological degradation, coking and moderate kinetics are known issues of state of the art Ni-YSZ cermet anodes.[1,2,3] Mixed ionic and electronic conductors are a promising alternative materials class for application in SOFC anodes, due to the increased number of electrochemically active sites and enhanced coking resistance. In contrast to Ni, carbon preferentially adsorbs in form of carbonates,[31] which leads to slow graphite growth kinetics, and enables dry CO2 electrolysis with outlet CO fractions exceeding the Boudouard equilibrium.[32] Morphological degradation of SOFC/SOEC fuel electrodes happens primarily due to de-wetting of nickel and strong metal support interaction, especially in electrolysis mode.[25,33] degradation due to microstructure evolution – including redox cycling damage – can be very efficiently minimized when Ni is not present in the active layer Despite these promising properties, experimental data on anodes with pure GDC active layers is scarce.
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