When dipoles and charged particles are introduced to represent the electrolyte, they will arrange themselves such that the total electrostatic energy is minimized. This leads to the emergence of an electrochemical double layer (EDL) on both plates where the electric field is very high, while at most other locations the electric field becomes zero. This allows to separate the two plates where one is the working electrode in an electrochemical cell. Now, we consider a general electrochemical reaction, written in the oxidation direction (positive current), where a reductant system 𝑅𝑒𝑑 becomes an oxidant system 𝑂𝑥, both in solution, denoted by the subscript 𝑎𝑞 (Eq. 1), donating 𝑧 electrons to the electrode.