A thin-film electrochemical arrangement has been developed to investigate the hot corrosion of preoxidized Ni by a fused Na2SO4 film at 1200 K in a catalyzed 0.1% SO2-O2 gas mixture. A Pt counterelectrode enables polarization measurements using the three-electrode configuration as well as open-circuit potentiometry. To extract mechanistic information without disturbing the system, the electrochemical impedance technique was used. Results of three distinct modes of hot corrosion (passive, pseudo-passive, and active) resulting from different preoxidation conditions are discussed.
SOFC fuel composition sensing is vital for operation control, monitoring and performance diagnosis. Sensors based on potentiometric measurements can yield accurate compositional correlations provided that chemical equilibrium is established on the electrode. For syngas sensing, sensitivity of open circuit potential to H 2 :CO ratio change was less than that of the humidification level variation. For methane systems, OCP sensors studied either failed to reach equilibrium due to inadequate catalytic activity or suffered from carbon deposition. Impedancemetric sensors provided reasonable responses in syngas and methane systems. Rh-impregnated LSCM/GDC sensors showed good catalytic ability and sensitivity toward methane without coking. Careful calibration is required to rule out ambiguity.
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