Abstract: The invention relates to a fuel cell (1) comprising an anode (10) capable of oxidizing a first compound M1 into first ions M(m+) with m being a non-zero integer, a first electrolyte (20) which is capable of conducting these first ions M(m+), and which is in contact with said anode (10), a cathode (50) capable of reducing a second compound N2 into second ions N(n?) with n being a non-zero integer, a second electrolyte (40) which is capable of conducting the second ions N(n?), and which is in contact with said cathode (50), a porous central membrane (30), one of the faces of which is in contact with said first electrolyte (20) and the opposite face of which is in contact with said second electrolyte (40). The first electrolyte (20), the second electrolyte (40), and the central membrane (30) consist of the same material which is capable of both conducting M(m+) ions and N(n?) ions.