Posez n’importe quelle question sur les cours, conférences, exercices, recherches, actualités, etc. de l’EPFL ou essayez les exemples de questions ci-dessous.
AVERTISSEMENT : Le chatbot Graph n'est pas programmé pour fournir des réponses explicites ou catégoriques à vos questions. Il transforme plutôt vos questions en demandes API qui sont distribuées aux différents services informatiques officiellement administrés par l'EPFL. Son but est uniquement de collecter et de recommander des références pertinentes à des contenus que vous pouvez explorer pour vous aider à répondre à vos questions.
Ozone prodn. in 5M H2SO4 with Ti/IrO2/SnO2 - Sb2O5 electrodes was studied. Electrodes were prepd. at 550 Deg by spray pyrolysis of a soln. of precursors contg. tin and antimony chlorides. The aim of this work was to elucidate the mechanism of activation and deactivation of Ti/IrO2/SnO2-Sb2O5 electrodes for ozone prodn. Under galvanostatic conditions the anodic potential and O3 prodn. increases firstly reaching a max. then suddenly decrease. The authors explain this observation by considering that the SnO2 layer prepd. by spray pyrolysis is under stoichiometric for oxygen. During the activation SnO2 becomes stoichiometric. This condition is necessary for ozone prodn. XRD anal. showed no modification of the structure of the bulk during ozone prodn. Nevertheless XRF anal. revealed an inhomogeneity of the at. Sb/Sn ratio on the surface of the electrode leading to pitting corrosion which is responsible of the deactivation of the electrode. [on SciFinder (R)]
Introduction
Fundamentals of Thermodynamics
Thermodynamics of Electrochemical Reactions
Example 1
Example 2
Example 3
Nernst Equation
Example 3
Cathodic Reactions in Corrosion
Pourbaix Diagrams
Pourbaix Diagram for Water
Pourbaix Diagram for Metals
Example: Pourbaix Diagram for Fe
Comments on Pourbaix Diagrams
Thermodynamics of High Temperature Corrosion