Published 2016
| Version v1
Publication
Influence of Working Parameters and Degradation on Anode-Supported Cells studied by Electrochemical Impedance Spectroscopy
Contributors
Description
Electrochemical Impedance Spectroscopy (EIS) is one of the most common techniques to
characterize Solid Oxide Fuel Cells (SOFCs) during operation and to evaluate the
influence on their performances of several working conditions and degradation effects.
However, process overlapping in the frequency domain makes it difficult to clearly
distinguish the contributions from each part of the cell to the impedance spectra.
Therefore, a precise attribution of the electrodes losses and their evolution during the cell
degradation becomes challenging.
In this work a state of the art anode-supported cell [Ni/8YSZ-cermet anode, 8YSZ
electrolyte with GDC interlayer, LSCF cathode] has been characterized by means of
current-voltage curves and EIS under several working conditions.
The impedance spectra have been analyzed calculating their distribution function of
relaxation times (DRT) allowing to separate 4 different loss mechanisms occurring at the
cell electrodes. The processes attribution has been carried out varying the feeding gases
composition at Open Circuit Voltage (OCV) and under the electrical current load of
500mAcm-1
. Such procedure allowed to identify the the anode as the most affected cell
component to the degradation after 100 hours of aging test under polarization.
Additional details
Identifiers
- URL
- http://hdl.handle.net/11567/895422
- URN
- urn:oai:iris.unige.it:11567/895422