Electrochemical Analysis of Sulfur-Poisoning in Anode Supported SOFCs Fuelled with a Model Reformate
Source abstract
Abstract
The impact of sulfur-poisoning on the electrochemistry of anode-supported solid oxide fuel cells (SOFCs) has been analyzed via electrochemical impedance spectroscopy. Therefore, single cells manufactured by Forschungszentrum Jülich (FZJ) were operated with a reformate fuel. During operation, contents of H 2 S (0.1 and 0.5 ppm) were added to the fuel. A detailed analysis of the measured impedance spectra by the distribution of relaxation times (DRT) and a subsequent complex nonlinear least squares (CNLS) fit enabled a separated treatment of the resulting degradation of anodic and cathodic polarization processes. During the exposure to 0.5 ppm H 2 S, the polarization resistance increased by 200%, leveling off after 24 h. This strong increase has mainly been attributed to the decreased reaction rate of the electrochemical fuel oxidation. Additionally, a strongly decreased conversion rate of the water-gas shift reaction was determined from the impedance measurements. This decreased shift conversion rate results in a dramatically lowered utilization of the CO within the fuel.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advancements in Solid Oxide Fuel Cells · Fuel Cells and Related Materials · Chemical Looping and Thermochemical Processes
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (26)
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