Electron conductivities are reported for dry thin films of Prussian blue and its completely oxidized and reduced forms, Prussian yellow and Everitt's salt. It has been discovered that desiccated Prussian blue films are non-ohmic in the sense that significant electron conduction does not occur below a threshold voltage of ca. -+ 0.5 V. Prussian yellow and Everitt's salt are ohmic and do not have a conduction threshold. The conductivities, as determined from the slopes of the i-V curves, are essentially the same for Prussian yellow, Everitt's salt, and Prussian blue above the voltage threshold, and are ca. 5 x 10 -7 (~ cm) -1. The solid state voltammogram of a wet film is also considered in terms of the persistence of the threshold and the onset of electrochemistry. We propose a qualitative explanation for the threshold voltage based on the assumption that the "valence band" (ferric ferrocyanide) is completely occupied and that the applied voltage injects electrons into the "conduction band" (ferrous ferricyanide). ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 132.174.254.159 Downloaded on 2015-05-26 to IP ABSTRACTThe stationary polarization of small, differential conversion, molten carbonate fuel cells (3 cm 2) was measured between 600 and 700~ under various gas compositions. Multiple linear regression was used to correlate the experimental data and to infer the rate-limiting processes in fuel cell electrodes. The analysis indicates that both the anode and the cathode are primarily under mixed control at 700~ at low partial pressures of CO2. The anode does not exhibit charge-transfer control under normal operating conditions, due to its very fast kinetics. The superoxide mechanism appears to be the dominant reaction in a fuel cell cathode.

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