This monograph provides a comprehensive overview of the key experimental and theoretical developments in electrochemistry from the 1800s to the 2020s. It gives the readers an understanding of the historical beginnings of electrochemical science and the significant advances that have shaped our current knowledge. The book traces the evolution of computational and model approaches used in electrochemistry, emphasizing both historical and present-day quantum chemical theories related to electrocatalysis. It offers insights into phenomenological understanding and mathematical expressions while it also provides an accessible overview for theorists new to electrochemistry who are interested in exploring this field. The book serves as a valuable reference for electrochemists interested in the history of their field and the evolving contributions of quantum chemistry.