A potentiostat is an electronic device used to control the voltage of an electrochemical cell while measuring the current that flows through it. It maintains a constant potential between the working electrode and a reference electrode, allowing researchers to study various electrochemical reactions. This tool is essential in fields like battery research, corrosion studies, and sensor development. In a typical setup, the potentiostat connects to three electrodes: the working electrode, the reference electrode, and the counter electrode. By adjusting the voltage, it can help scientists understand the behavior of materials under different conditions, contributing to advancements in technologies such as lithium-ion batteries and fuel cells.