Tris(2,2'-bipyridine)cobalt(II) Bis(hexafluorophosphate) is primarily used in electrochemical applications, particularly in the development of redox-active materials. It serves as a key component in dye-sensitized solar cells (DSSCs), where it acts as a redox mediator to enhance electron transfer efficiency. This compound is also employed in catalysis, especially in photochemical reactions, where its ability to undergo reversible redox processes is leveraged. Additionally, it finds use in research focused on molecular electronics and sensors, owing to its stable coordination complex and distinct electrochemical properties.