Hjälpelektroden

Hjälpelektroden, also known as the reference electrode, is a crucial component in electrochemical systems, particularly in potentiometry and electrochemistry. It serves as a stable reference point for measuring the potential difference between the working electrode and the solution. The potential of the hjälpelektroden is constant and well-defined, allowing for accurate determination of the potential of the working electrode.

Common types of hjälpelektrodens include the standard hydrogen electrode (SHE), the silver-silver chloride electrode (Ag/AgCl), and the calomel electrode. Each type has its own advantages and limitations, depending on the specific application and the electrolyte used. For example, the SHE is considered the standard reference electrode but is not practical for routine use due to its complexity and the need for pure hydrogen gas. The Ag/AgCl electrode is more commonly used in laboratory settings due to its stability and ease of preparation.

The choice of hjälpelektroden is critical for obtaining reliable and reproducible electrochemical measurements. It must be stable, reproducible, and have a well-defined potential. Additionally, the hjälpelektroden should not interfere with the electrochemical reactions occurring at the working electrode. Proper selection and maintenance of the hjälpelektroden are essential for accurate and precise electrochemical analysis.