An electrolytic cell for the electrolysis of an electrolyte, preferably water, comprising in turn: a first lamina (11) made of electrically conductive material adapted to act as an anode; a second lamina (12) made of electrically conductive material adapted to act as a cathode; a third lamina (14) made of dielectric material interposed between said first (11) and second (12) laminae and configured to convey a flow of electrolyte from a lower portion (21) to an upper portion (23) of said third lamina (14); said third lamina having a first surface (A) facing towards said first lamina and a second surface (B) facing towards said second lamina; wherein said third lamina is disposed in fluid connection with at least one inlet conduit (19') of an electrolyte disposed at said lower portion (21), at least one outlet conduit (19'') of an electrolyte disposed at said lower portion (21), and at least one conduit (20', 20'') for extracting a gas obtained by electrolysis disposed at said upper portion, said cell comprising at least one non-return valve (50, 51) disposed at said lower portion (19) of said third lamina (14) along said inlet conduit (19') configured to convey the flow of electrolyte unidirectionally along said inlet conduit towards a central portion (22) of said third lamina (14) comprised between said lower portion (21) and said upper portion (23).