Intermediate temperature solid oxide fuel cells fed with syngas: an evaluation of electrochemical phenomena
Author(s)
Pumiglia, Davide
Date Issued
July 13, 2017
Type
Doctoral Thesis
Abstract
In this work, an in-depth characterization of the processes occurring within SOFCs operating with syngas has been achieved by means of homogeneous testing protocols, innovative testing equipment and complex analysis methods, some of them applied while in operando.
The Distribution of Relaxation Times (DRT) method applied to Electrochemical Impedance Spectroscopy (EIS) measurements carried out over a wide range of operating conditions allowed the recognition of the single physicochemical processes and their contribution to the overall performances, the estimation of parameters related to the different processes, and the evaluation of degradation effects caused by a long operation of SOFC fed with clean and contaminated syngas.
Measurements with an innovative, in-house built experimental set-up, allowing to perform localized sampling of gas compositions and temperatures directly in operando have been realized, optimized and employed in the study of the thermal and concentration gradients arising along the anode surface. Chemical and thermal mapping of the anode surface have been obtained under different operating conditions, both with hydrogen and syngas fuels, highlighting the evolution, the competition and the impact of the different reactions with a spatial resolution.
The obtained results provide an in-depth picture of the most important factors affecting the overall performances of syngas-fed SOFC cells, opening new perspectives for the investigation of SOFC systems.
Additional information
Dottorato di ricerca in Ecosistemi e sistemi produttivi
Subjects
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