A hydrogen fuel cell comprises: (a) a first hollow member, which receives a hydrogen-contg. gas into its interior space and is an effective means for passing the H-contg. gas from the interior space to its peripheral surface: (b) a first conductive winding wound round the peripheral surface of the first hollow member; (c) an electrolytic member disposed around the first conductive winding; and (b) a second conductive winding wound around the electrolyte member. Also claimed is a hydrogen fuel cell comprising: (A) a first hollow member as above; (B) an anode comprising a first conductive winding as above and a hydrogen decomposition catalyst (see Preferred Windings below); (C) an electrolytic member disposed around the first conductive winding for passing the H+ ions through it; (D) a cathode comprising a second conductive winding as above and an oxygen decomposition catalyst (see Preferred Windings below); and (E) a second hollow member for containing (A)-(D) above and for receiving the oxygen-contg. gas    USE -   The cells are used to produce electricity without producing environmentally harmful by-prods. They are partic. suitable for use in remote places, e.g. outer space.    ADVANTAGE -   The fuel cell is easy to mfr. because complicated sealing and gasketing requirements have been eliminated and it may be ultra-light-weight. Assembly may be carried out by robots as no operations involving difficult manipulation are required. It uses a solid Pr-Exchange Membrane electrolyte, which eliminates problems arising from migration of the electrolyte to other parts of the cell and is mechanically stable and hardy under a wide range of operating conditions. Multiple cells may be arranged in any convenient configuration. The cells are sealed by in a way that is not subjected to swelling forces generated by the electrolytic membrane. Fuel and oxidizing gases do not have to be distributed through load-bearing distribution members, allowing more open configurations and greater design flexibility.