Dear student, Electrode potential, E, in chemistry or electrochemistry, according to an IUPAC definition, is the electromotive force of a cell built of two electrodes: on the left-hand side of the cell diagram is the standard hydrogen electrode (SHE), and. on the right-hand side is the electrode in question. The cell potential, Ecell, is the measure of the potential difference between two half cells in an electrochemical cell. The potential difference is caused by the ability of electrons to flow from one half cell to the other. Regards