Inert Anode:
An inert anode is an anode that is insoluble in the electrolyte under the conditions obtained in electrolysis.
An inert anode does not participate in reactions during electrolysis. For example, an anode of platinized titanium is used in cathodic protection which is long-lasting and requires an impressed direct current.
feature of inert anode:Increased energy efficiencyReduction in operating costsSignificant reductions of emissions such as CO2 and perfluorocarbonsProcess productivity increaseLower emissions
Anodic potentials and materials made of inert anodes have significant impact on corrosion. For example, the corrosion rate of tin oxide-based anodes showed normal corrosion at anodic potentials of 2.2 to 2.4 V with respect to aluminum. At potentials higher than ~2.5 V, the anodes showed catastrophic corrosion. Catastrophic corrosion can be ascribed to decomposition of the anode material by depletion of alumina at the anode surface provoked by low bulk concentration of alumina and/or high current density.
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