Electrochemically active heterostructures "any electrodes - solid protonic conductors, based on solid eutectics or crystalline hydrates of KOH or NaOH" are studied in Ioffe Instutute (St-Petersburg) from fundamental view point on physico-chemical problems of proton-conducting materials at room-temperature range. We are srudying as electrodes IV group (C. Si, Ge, Sn) and factually novel solid protonic conductors KOH.nH2O (n=o,5; 1,0; 2,0). See http://www.solidionic.com and publication in researchgate