Ni-Based SOFC Anodes: Microstructure and Electrochemistry
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Date
2001
Publication Type
Journal Article
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yes
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Abstract
The electrochemical behavior of Ni-based SOFC anodes with different microstructures was studied. The anodes consisted either of a Ni gauze, a Ni pattern, a Ni paste, or a Ni -YSZ cermet. According to electrochemical impedance spectroscopy (EIS) measurements, the anodes are dominated by two main processes. The high frequency process decreases exponentially with an applied overpotential and is thermally activated with an activation energy of around 1 eV. The process could be attributed to the adsorption of hydrogen including charge transfer. The low frequency impedance arc arises only under a high overpotential applied between the working and the reference anode. The impedance of this process increases the higher the overpotential and is thermally activated with an activation energy of 0.5 eV. This process is assigned to the desorption of water.
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Journal / series
Volume
92 (7)
Pages / Article No.
796 - 802
Publisher
Hanser
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Subject
Electrochemistry; SOFC Anodes; Microstructure