The Center for Interfacial Ionics (CI 2) is working to revolutionize the understanding of interfacial-ion-transfer (IIT) kinetics by coupling measurements of molecularly precise and tunable liquid/liquid and solid/liquid interfaces with advances in theory and computation to produce accurate theoretical frameworks of broad applicability. The CI 2 IIT research platform aims to deliver a predictive understanding of how to modulate IIT rates via chemical design of interface, solvent, and ion structure, enabling new ways to improve electrochemical technologies.