Understanding proton behavior at interfaces is critical to the development of several electrochemical devices, such as batteries, fuel cells, and sensors. One aspect of this project focuses on studying how various factors of the electrocatalytic interface influence reactions, such as the oxygen reduction reaction and the hydrogen oxidation reaction, that take place on this surface. This research utilizes High Resolution Electron Energy Loss Spectroscopy (HREELS) and Density Functional Theory (DFT) as a two-pronged experimental and theoretical approach to studying this complex interface. The second aspect of this project focuses on understanding proton behavior in yttrium-doped barium cerate (BCY), a perovskite material that exhibits extremely rapid proton conduction. Using DFT we will study BCY hydration and model the basic mechanism of proton transport within and at the interface of this material.