Butylferrocene is primarily used in electrochemical applications due to its redox-active properties. It serves as a mediator in biosensors, enhancing the detection of biological molecules by facilitating electron transfer processes. In fuel additives, it improves combustion efficiency and reduces emissions by acting as a catalyst. Additionally, it is employed in organic synthesis as a building block for creating complex organometallic compounds. Its stability and unique electronic properties also make it valuable in research for studying electron transfer mechanisms and developing advanced materials.