Cathode dissolution

In the presence of sulfite anions and absence of oxygen, CdS sols undergo photo-cathodic dissolution... 

Colloids of a-FejOj are made by hydrolysis of FeClj and subsequent dialysis of the sol. Polyvinyl alcohol is often used as a stabilizing agent. The band gap in Fe203 is 2.2 eV. In some of the studies on colloidal Fc203 free radicals were generated by ionizing radiation and electron transfer reactions with the colloidal particles investigated. Buxton et al. observed a cathodic dissolution of a-FCjOj in acidic... 

Film growth (and its cathodic dissolution) is controlled by similar laws as... 

Cathode dissolution (NiO) and reduction of dissolved nickel to a metal particle precipitate in the electrolyte matrix... 

Another idea for resolving the cathode dissolution problem is to formulate a milder cell environment This leads to the approach of using additives in the electrolyte to increase its basicity. Small amounts of additives provide similar voltages to those without additives, but larger amounts adversely affect performance (39). Table 6-2 quantifies the limiting amounts of additives. 

In an MCFC power system, increased pressure can result in increased cathode corrosion. Cathode corrosion is related to the acidity of the cell, which increases with the partial pressure of CO2, and therefore with the cell pressure. Such corrosion is typified by cathode dissolution and nickel precipitation, which can ultimately result in a shorted cell, causing cell failure (37). Thus, the chosen pressure of the MCFC has a direct link to the cell life, economics, and commercial viability. 

Catalytic Activity of Cathodic Materials for MCFCs. This project, supported by the Programme for Scientific and Technical Bilateral Cooperation between Portugal and Spain), addressed stability of materials and the electrolyte under operating conditions and consequent loss of catalytic activity. Given the complexity of the problem and the time context for this type of project, the research was limited to the cathode Dissolution of LiNiO cathodes has lead to the search for novel alternative materials that, exhibiting high electronic conductivity and... 

Electrochemical reactions with use of a sacrificial cathode [121], which have not yet been reported in relation to phthalocyanine, could have theoretical success in the synthesis of PcM. The cathode dissolution takes place due to the action of free radicals formed in solution near the cathode surface [121] in the case of the synthesis of Pc (which is formed on the cathode surface), UV irradiation of the reaction mixture could serve as a source of free radicals. 

Abrasive stripping voltammetry — Technique where traces of solid particles are abrasively transferred onto the surface of an -> electrode, followed by an electrochemical dissolution (anodic or cathodic dissolution) that is recorded as a current-voltage curve [i]. It allows qualitative and quantitative analysis of metals, alloys, minerals, etc. The technique is a variant of - voltammetry of immobilized particles [ii]. 

Cathode Cathode stability Electrocatalytic activity Cathode dissolution Extent of electrolyte filling Cathode shrinkage Changes in the microstructure Deformations at the separator ribs Changes in the electrocatalytic activity Increase in the polarization due to increase in the electronic resistivity of the electrode... 

The cathodic dissolution of chlorine is limited by diffusion of chlorine in the melt to the electrode surface under high current conditions, whereas at low currents the process of dissociation of chlorine on the surface is followed by the charge transfer process [83]. 

Higgins and Hammers used STM to study both anodic and cathodic dissolution of PbS (001) in aqueous solutions. " They observed etching and nucleation at the edges depending on the potential conditions. Atomic resolution images revealed the expected square (001) surface lattice. Furthermore, they reported the atomic cormgation for the Pb redeposited in the form of islands with Pb(l 11) geometry. 

One of the cathodic dissolution of metal oxides frequently encountered in the corrosion of metallic iron is the reductive dissolution of ferric oxide ... 

FIGURE 22.11 Energy diagrams for anodic and cathodic dissolution of compound semiconductor electrodes (a) anodic dissolution impossible, (b) anodic dissolution possible, (c) cathodic dissolution impossible, and (d) cathodic dissolution possible [16] P(redox) = Fermi level of anodic and cathodic semiconductor dissolution reactions. 

An obvious advantage of the method is that the alloy used does not necessarily have to involve a reactive alkali or alkaline-earth metal for instance, a number of Sb Te// species are produced in the cathodic dissolution of an Sb2Tc3 alloy. 

K. Ogura, K. Sato, Cathodic dissolution of the passive film on iron—I. Kinetics and mechanism, Elec-trochim. Acta 25 (1980) 857—862. 

Fangteng, S., Charles, E.A., 1988. A theoretical approach to galvanic corrosion, allowing for cathode dissolution. Corros. Sci. 28, 649—655. 

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