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Impedance and Raman Spectroscopy Study of Effect of H 2 S on Ni‐YSZ SOFC Anodes
Author(s) -
Mai Thi H. H.,
Rosman N.,
Sergent N.,
Pagnier T.
Publication year - 2017
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201600182
Subject(s) - raman spectroscopy , anode , dielectric spectroscopy , scanning electron microscope , materials science , polarization (electrochemistry) , analytical chemistry (journal) , electrode , yttria stabilized zirconia , solid oxide fuel cell , electrical impedance , spectroscopy , electrochemistry , chemistry , composite material , optics , electrical engineering , ceramic , cubic zirconia , physics , chromatography , quantum mechanics , engineering
The electrical behavior of a Ni‐YSZ anode of a solid oxid fuel cell (SOFC) cell under H 2 S has been monitored by impedance spectroscopy combined with in situ Raman spectroscopy and post mortem scanning electron microscopy (SEM) at 500 °C in open circuit potential (OCP) and at 500 mV polarization. In OCP condition, the electrode impedance spectra evolved slowly corresponding quite well to the evolution of Raman signals' intensities. Meanwhile, at 500 mV polarization, the impedance spectra transformed much faster, indicating a quick and severe H 2 S‐induced poisoning, which is then confirmed by post mortem examinations by SEM with the densification of the bulk anode porous structure with (Ni, S) phase. Based on the experimental data, the elementary steps and location of H 2 oxidation are discussed.