elohopeakenno

Elohopeakenno is a Finnish term that translates to "mercury cell." It refers to an electrochemical cell that uses mercury as one of the electrodes, typically the cathode. These cells were historically important for their high energy density and long shelf life, making them suitable for various applications.

The most common type of mercury cell was the mercury oxide-zinc cell. In this configuration, zinc acts as the anode and mercury(II) oxide serves as the cathode. The electrolyte is usually a concentrated alkaline solution, such as potassium hydroxide. The chemical reaction involves the oxidation of zinc at the anode and the reduction of mercury(II) oxide at the cathode.

Mercury cells were widely used in portable electronics, hearing aids, and older camera batteries. Their stable voltage output and resistance to self-discharge made them reliable power sources. However, concerns about the environmental toxicity of mercury led to a significant decline in their use. Regulations and the development of safer, more environmentally friendly battery technologies, such as alkaline and lithium-ion batteries, have largely replaced mercury cells. While obsolete in many consumer applications, they may still be found in some specialized or older equipment.