Construction and working of Rotating platinum electrode
A rotating platinum electrode (RPE) is a type of electrode used in electrochemical studies to investigate the kinetics of electrode reactions. It is a cylindrical electrode made of platinum that rotates at a high speed to ensure that the surface of the electrode is constantly renewed and the concentration of reactants at the electrode surface is maintained at a low level.
The construction of an RPE consists of a thin layer of platinum deposited on a glass or quartz rod, which is attached to a motor to rotate the electrode. The electrode is usually immersed in an electrolyte solution and connected to a potentiostat, which controls the potential applied to the electrode and measures the resulting current.
The working principle of an RPE is based on the fact that the rate of an electrochemical reaction is proportional to the concentration of the reactants at the electrode surface. By rotating the electrode at a constant speed, the concentration of reactants at the electrode surface is constantly refreshed, which allows for accurate measurement of the reaction kinetics.
The RPE is commonly used in a technique called cyclic voltammetry, which involves applying a potential waveform to the electrode and measuring the resulting current. By varying the potential waveform, information about the electrochemical reaction mechanism and kinetics can be obtained.
In summary, the rotating platinum electrode is a specialized electrode used in electrochemical studies to investigate the kinetics of electrode reactions. Its construction involves a thin layer of platinum deposited on a glass or quartz rod, which is attached to a motor to rotate the electrode. Its working principle is based on the constant renewal of the electrode surface, which allows for accurate measurement of reaction kinetics.
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