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Thin layers of fuel cells are provided on the housings of portable electrically-powered devices. The fuel cells provide electrical power for the devices. The fuel cell layers can follow contours of the device housings. some embodiments provide fuel plenums between a surface of the housing and a fuel

Thin layers of fuel cells are provided on the housings of portable electrically-powered devices. The fuel cells provide electrical power for the devices. The fuel cell layers can follow contours of the device housings. some embodiments provide fuel plenums between a surface of the housing and a fuel cell layer. The fuel plenum may carry a fuel such as hydrogen gas to fuel cells of the fuel cell layer.

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What is claimed is: 1. An electrically powered device comprising: a housing defining an envelope, the envelope having a surface; at least one electrically-powered component located in an interior of the housing; and a thin layer fuel cell array disposed on and supported by the housing, the fuel cel

What is claimed is: 1. An electrically powered device comprising: a housing defining an envelope, the envelope having a surface; at least one electrically-powered component located in an interior of the housing; and a thin layer fuel cell array disposed on and supported by the housing, the fuel cell array coextensive with and substantially conforming to an area of the surface, the fuel cell array comprising a plurality of unit fuel cells each having a cathode and an anode and connected to supply electrical power to the electrically-powered component wherein the cathodes of the unit fuel cells are on an outer surface of the fuel cell array that faces outwardly and is in direct contact with ambient air on an outside of the housing and the anodes of the unit fuel cells are on an inner side of the fuel cell array toward the interior of the housing. 2. An electrically-powered device according to claim 1 comprising a fuel plenum defined between the fuel cell array and a layer of the housing. 3. An electrically-powered device according to claim 2 wherein the fuel plenum is substantially coextensive with the fuel cell array. 4. An electrically-powered device according to claim 2 wherein the fuel cell array is part of a structure which provides a fuel plenum in contact with the anodes of the unit fuel cells and the structure is affixed to the housing of the device. 5. An electrically-powered device according to claim 4 wherein the structure has a thickness of 5mn or less. 6. An electrically-powered device according to claim 1 wherein the fuel cell array comprises a plurality of unit fuel cells connected in series with one another. 7. An electrically-powered device according to claim 6 wherein an output voltage of the fuel cell array is at least about 6 volts. 8. An electrically-powered device according to claim 1 wherein the fuel cell array comprises a 2D array, the 2D array providing electrically-interconnected unit fuel cells distributed in a two-dimensional pattern. 9. An electrically-powered device according to claim 1 wherein the fuel cell array comprises current-collection conductors embedded in the fuel cell array. 10. An electrically-powered device according to claim 1 wherein cathodes of fuel cells in the fuel cell array are in contact with the air by way of a gas diffusion layer and the gas diffusion layer comprises a layer of carbon that is activated to absorb contaminants. 11. An electrically-powered device according to claim 1 wherein the outer surface of the fuel cell array is coated with a hydrophobic layer. 12. An electrically-powered device according to claim 1 comprising a porous cover covering the outer surface of the fuel cell array. 13. An electrically-powered device according to claim 1 wherein the fuel cell array is disposed on an inside surface of the housing, and the housing is apertured in a portion overlying the outer surface of the fuel cell array to permit the ambient air to reach the cathodes of the fuel cells of the fuel cell array. 14. An electrically-powered device according to claim 13 comprising a breathable waterproof membrane disposed to prevent moisture from entering the housing through the apertured portion of the housing. 15. An electrically-powered device according to claim 1 wherein the fuel cell array is disposed on a surface of the housing, and wherein the surface of the housing is not planar and the fuel cell array conforms to contours of the surface of the housing. 16. An electrically-powered device according to claim 1 wherein the device comprises a portable electronic device intended to be carried by a person and the housing comprises a case of the device. 17. An electrically-powered device according to claim 16 wherein the device comprises one or more of: a personal computing device, an entertainment device, a safety device, a piece of technical equipment and a small appliance. 18. An electrically-powered device according to claim 16 wherein the device comprises one or more of a tablet or laptop computer, a personal digital assistant, a radio, a television, a music player, a video player, a camera, a video camera, a sound recorder, a two-way radio, a cellular telephone, a satellite telephone, a personal alarm, a flashlight, a beacon, a warning light, an electronic tester, an oscilloscope, a frequency generator, a portable vacuum, and a portable dust blower. 19. An electrically-powered device according to claim 1 wherein the device is a land vehicle, a water vehicle or an aircraft. 20. An electrically-powered device according to claim 19 wherein the housing comprises a body panel of the vehicle. 21. An electrically-powered device according to claim 1 wherein the outer surface of the fuel cell array is flush with an outer surface of the housing. 22. An electrically-powered device according to claim 1 wherein the outer surface of the fuel cell array projects outwardly by no more than 5 mm from an outer surface of the housing. 23. An electrically-powered device according to claim 1 wherein the inner side of the fuel cell array is flush with an outer surface of the housing. 24. An electrically-powered device according to claim 1 wherein the inner side of the fuel cell array is flush with an inner surface of the housing. 25. An electrically-powered device according to claim 15 wherein the surface of the housing has a cylindrical portion and the fuel cell array extends around the cylindrical portion of the surface.