On the Electronic Conduction in Dry Thin Films of Prussian Blue, Prussian Yellow, and Everitt's Salt

Abstract

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.

Grain‐Boundary‐Free Super‐Proton Conduction of a Solution‐Processed Prussian‐Blue Nanoparticle Film

“…The charge‐transport mechanism of PB was investigated by employing common electrode systems keeping in contact with electrolyte solutions: electrodeposited PB films on an ITO electrode was reported as an ionic conductor and an insulator phase . In this study, the electrode system has the ultimately limited contact area between the mono‐particle film and the Au electrodes (Figure b).…”

Prussian Blue Modified Solid Carbon Nanorod Whisker Paste Composite Electrodes: Evaluation towards the Electroanalytical Sensing ofH2O2

“…The PB was decided not to be chemically attached to SCNR due to low electrical conductivity of dry PB, [28][29][30], experimentally shown in the work of Ricci et al [26]. where they needed to include unmodified glassy carbon particles into the paste to have useful electrochemical response that is, electrical connection between particles therein.…”

Grain‐Boundary‐Free Super‐Proton Conduction of a Solution‐Processed Prussian‐Blue Nanoparticle Film

“…Thec harge-transport mechanism of PB was investigated by employing common electrode systems keeping in contact with electrolyte solutions:e lectrodeposited PB films on an ITOe lectrode was reported as an ionic conductor [26] and an insulator phase. [27] In this study,t he electrode system has the ultimately limited contact area between the mono-particle film and the Au electrodes (Figure 1b). To clarify the crucial issue of the NP films due to the grain-boundary components, the electrode system was more suitable than the common systems such as pellets and film-modified ITOsubstrates with the extremely large contact areas.W ed isclosed the protonconduction mechanism in the solution-processed films of the PB NPs via the comparison experiments with Nafion films, where the AC impedance and the DC current measurements were carried out using the same electrode systems noncontact with electrolyte solutions.I no ur strategy (3), the formation of new {Fe III -[(NC)Fe II (CN) 5 ] 4À }-Fe III bonds in the grain boundaries (Figure 2b-d) are accompanied by loss of the coordination H 2 O: the hydration number of the PB NPs decreases from 19 to 11 at 30 gm À3 by heating (Figure 5b).…”