Abstract
One of the major factors limiting solid oxide fuel cell (SOFC) performance is the degradation of chromium containing interconnects during operation. Under SOFC operating conditions chromium ions are vaporized by the cathode gas and reduced at catalytic sites within the cathode to form Chromium (III) Oxide. The formation of Cr2O3 blocks catalytically active sites and results in significant degradation in performance over the life of a fuel cell stack. This degradation has been traditionally measured via the transpiration measurement system; however, this method is expensive and time consuming. A novel method has been proposed to supplement the standard transpiration measurement system utilizing low cost solution conductivity measurement. Conductivity is linearly correlated to the amount of dissolved chromium species in a deionized water (DI water) solution and initial tests indicate that chromium concentration can be continuously monitored as a function of time using the solution conductivity method.
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