NaCl Effect on SOFC Cathode

Abstract

Abstract-The fact that NaCl in air has induced degradation of cathode has been investigated for La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF). Cell performance was measured by volatilizing NaCl into the air supplied to the cathode at a constant current density of 200 mA cm -2 up to 100 h. At 800 o C, an exposure to 30 ppm NaCl caused negligible degradation of LSCF cathode at least for 100 h, yet degradation became obvious with increasing NaCl concentration. Slight change in the composition of the cathode materials was observed which may lead to the gradual degradation of cell performance. In addition, cell performance degradation was compared between 700 o C to 900 o C, being poisoned by 30 ppm NaCl. The LSCF cathode showed slightly poor tolerance of NaCl at 700 o C due to the decomposition of the cathode material. The long-term influence of NaCl on cathode performance should be done to clarify.

Single-Cell Tests to Explore the Reliability of Sofc Installations Operating Offshore

“…The results of the short-term tests are qualitatively similar to those obtained by Liu et al [3], but in contrast to them we did find more reduction in cell performance, although still moderate, with the higher salt concentration in the cathode feed than with the lower concentration.…”

“…Liu et al [3] did not perform long-term tests and could therefore not have found the same severe reduction in cell performance due to delamination as we found in this study.…”

“…For investors to invest in large-scale power conversion installations based on fuel cells, however, fuel cell installations need to be shown to be robust and reliable in the field. Herein lies an important challenge in fuel cell research and development today [2,3].…”

“…Liu et al [3] studied the effect of salt, at two different concentrations, 30 and 600 ppm, in the air feed to solid oxide fuel cells operated at a fixed current density of 200 mA/cm 2 . With salt at a concentration of 30 ppm they found only moderate reduction in the cell voltage.…”

“…For the operation of maritime fuel cell installations impurities on the cathode side may well pose a problem for the long-term performance of the installation. To our knowledge there are no studies in addition to that of Liu et al [3] in the literature focusing on the likely disturbances leading to degradation in fuel cell installations offshore, and therefore no studies wherein complete I-V curves are presented or studies that involve long-term testing.…”