This paper “Part 2: Surface Adsorption, Electric Double Layer, and Diffusion Layer” is the applicational part a continuation of 1: Fundamentals” (https://doi.org/10.5796/electrochemistry.22-66082). explains principles cyclic voltammetry on adsorption, electric double layer, diffusion layer with microelectrodes. Moreover, recent trends, such as polymer electrolyte fuel cells (PEFCs), capacitors ...