Abstract
Sulfur causes Ni-based ceramic anode poisoning and thus shortens the life of the cell. Therefore, it is important to clarify the mechanism of sulfur poisoning to improve cell performance and lifetime. However, there is still some controversy about the mechanism of sulfur poisoning. In this work, Ni-patterned electrodes were used to investigate the mechanism of sulfur poisoning under different H2S concentrations and current densities. The electrochemical performance decreased with the H2S concentration increasing from 0 to 5 ppm due to the decrease of H2 reaction active sites. When further increasing the H2S concentration to 50 ppm, the performance showed a different trend and recovered to the initial performance without H2S due to the electrochemical oxidation of H2S. Increasing the current density was found to alleviate sulfur poisoning to some extent. The patterned electrode demonstrated a useful tool for the study of H2S poisoning mechanism.
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