Electro-oxidation process

The Pt surface electro-oxidation process observed in the absence of dioxygen to form chemisorbed OH from water is driven by the potential difference at the Pt/ electrolyte interface, according to the reaction... 

Canizares, P., Garcia-Gdmez, J., Lobato, J. and Rodrigo, M.A. (2004a) Modeling of wastewater electro-oxidation processes. Part I. General description and application to inactive electrodes. Ind. Eng. Chem. Res. 43, 1915-1922. 

For a given electrode process, the reaction rate is a strong function of potential, and we noted above that an overpotential above the equilibrium cell voltage should be overcome to excite the electrode reactions. Thus, an accurate kinetic picture of any dynamic process needs a thermodynamic equation form in the limit of equilibrium. In the electro-oxidation process of SO2, the equilibrium is characterized by the Nemst equation, which links the electrode potential to the concentration of constituents in the solution. In a general form of oxidation reaction. Ox - - ne Red, the electrode potential can be written as follows ... 

Figure 1. Electro-oxidation process of ammonia nitrogen.

Panizza M (2011) Application of synthetic diamond films to electro-oxidation processes. In Brillas E, Martmez-Huitle CA (eds) Synthetic diamond films - preparation, electrochemistry, characterization and applications. Wiley-VCH, New York, pp 333-351... 

From the above, it can be concluded that the deposition of a cerium-rich layer when Ce is present in concentrations from 100 to lOOOppm in the medium, is caused by precipitation of the Ce hydroxide, CelOH). Thus, the layer would be composed of this hydroxide or its hydrated oxide. Nonetheless, by raising the immersion time in the medinm, the generation of could be favored in the oxygen reduction reaction. Thus, the composition of the cerium-rich layer could vary and become a mixture of cerium (m) lydroxide/oxide and cerium (IV) because of an electro-oxidation process inside the film. 

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