“…1, are the electrochemical sensors (case a), when the potential of the cell is affected by the concentration of the compound which is needed to be detected [34], the fuel cells (case c), which can convert the free energy of the reaction directly to electrical energy, bypassing the thermodynamic limitations of the conventional thermal engines [35,36] and the SEMRs (case b), where the target is the electrochemical modification of the catalytic activity towards higher reaction rates [30,31]. Other applications of great importance are solid state batteries [37], oxygen separators [38], hydrogen separators [13], dehumidifiers [13], etc.…”