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877,410. Fuel cells. NATIONAL RESEARCH DEVELOPMENT CORPORATION. Sept. 27, 1957 [Oct. 5, 1956], No. 30497/56. Class 53. A fuel cell employing liquid or gaseous fuel, for example water gas, and an aqueous, solid or fused electrolyte, is provided with electrodes of of a non-stoichiometric compound. The fuel electrode has an excess of the electronegative constituent, and the oxygen or halogen electrode an excess of the electropositive constituent. The Figure shows a cell in which liquid or gaseous fuel is supplied through a pipe 5 to a porous electrode 2 of which at least the surface 2a is of non-stoichiometric' material, for example black oxide of nickel, ferrous oxide, cuprous oxide, or oxide of cobalt, titanium or uranium. Non-stoichiometric sulphides of chromium, or ferric sulphide, may also be used. The part 2 of the electrode may consist of porous sintered nickel. Air, oxygen, or a halogen, is supplied through a pipe 7 to the electrode 3 the surface 3a of which may consist of non- stoichiometric zinc oxide or cadmium oxide, the particles of which may be coated with silver. Thoria or silver may also be used. The pores of the surface portions 2a, 3a may be smaller than the pores of the parts 2, 3 to reduce penetration of the electrolyte 4. Electrodes of nickel oxide and zinc oxide may be used with an electrolyte of magnesium oxide dissolved in fluorides.
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