Jänniteikkuna

Jänniteikkuna, often translated as voltage window or voltage bias window, refers to the range of potentials that an electrochemical cell can be subjected to without causing irreversible reactions or damage to the electrodes or electrolyte. This concept is crucial in various electrochemical applications, including electroplating, electrolysis, and battery operation.

Within the jänniteikkuna, electrochemical processes are typically reversible or kinetically controlled, meaning they can be readily reversed by changing the potential or are limited by the rate of mass transport. Exceeding the upper limit of the jänniteikkuna can lead to undesirable side reactions such as solvent decomposition or gas evolution, while going below the lower limit might cause metal deposition or other unwanted changes.

The size and location of the jänniteikkuna are determined by the specific materials used in the electrochemical system, including the working electrode, counter electrode, reference electrode, and the electrolyte composition. Understanding and respecting the jänniteikkuna is essential for optimizing electrochemical performance, ensuring the longevity of the system, and preventing the formation of detrimental products. In cyclic voltammetry, the potential sweep is usually kept within the jänniteikkuna to study the reversible behavior of electroactive species.