International Journal of Hydrogen Energy, Vol.34, No.14, 5737-5748, 2009
Interaction between (La, Sr)MnO(3) cathode and Ni-Mo-Cr metallic interconnect with suppressed chromium vaporization for solid oxide fuel cells
Interaction between (La(0.8)Sr(0.2))(0.90)MnO(3) (LSM) cathode and newly developed Ni-Mo-Cr metallic interconnect is investigated at 900 degrees C under operation conditions of solid oxide fuel cells (SOFCs). The results show that chromium deposition on the LSM cathodes in the presence of Ni-Mo-Cr interconnect is remarkably reduced as compared to that in the presence of a conventional Fe-Cr metallic interconnect (RA446). In contact with the Ni-Mo-Cr interconnect the overpotential, eta, for the O(2) reduction reaction on LSM cathode decreased from 529 to Ill mV during the 1200 min current passage at 200 mA/cm(2). In contrast, eta increased from 464 to 561 mV for the reaction in the presence of a RA446 interconnect. The decrease in eta clearly indicates that chromium poisoning effect of the Ni-Mo-Cr interconnect is also significantly suppressed as compared to that with conventional Fe-Cr interconnect materials. The suppressed Cr deposition and poisoning effects observed on the LSM cathodes demonstrate promising potential of the Ni-Mo-Cr alloy as new interconnect materials with significant suppressed chromium vaporization and deposition for SOFCs. (C) 2009 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
Keywords:Solid oxide fuel cells;Chromium deposition;LSM cathode;Ni-Mo-Cr metallic interconnect;Chromium poisoning