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Fuel cell components provide fuel cells on a flexible sheet that defines a wall of a flexible plenum. An external support structure limits expansion of the plenum in response to forces exerted by a pressurized reactant. The external support structure may comprise a portion of a housing of a portable

Fuel cell components provide fuel cells on a flexible sheet that defines a wall of a flexible plenum. An external support structure limits expansion of the plenum in response to forces exerted by a pressurized reactant. The external support structure may comprise a portion of a housing of a portable device. Cathodes of the fuel cells may be accessible from an outside of the flexible sheet and exposed to ambient air while anodes of the fuel cell are accessible from an inside of the flexible sheet and exposed to a fuel, such as hydrogen gas.

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1. A fuel cell apparatus comprising: a plenum enclosed by flexible walls, at least one of the flexible walls including a first flexible two-dimensional fuel cell array, the array including two or more fuel cells, the fuel cells having anodes accessible from a first side of the first flexible array a

1. A fuel cell apparatus comprising: a plenum enclosed by flexible walls, at least one of the flexible walls including a first flexible two-dimensional fuel cell array, the array including two or more fuel cells, the fuel cells having anodes accessible from a first side of the first flexible array and cathodes accessible from a second side of the first array, wherein one but not both of the first side or the second side is accessible from within the plenum;an inlet for connecting the plenum to a source of a reactant;current-carrying structures embedded within the two-dimensional fuel cell array, wherein at least a portion of the current-carrying structures are disposed between the first and second sides of the first flexible array; and,an external support structure disposed to limit outward expansion of the flexible walls. 2. The fuel cell apparatus according to claim 1 wherein the inlet comprises a fuel inlet, the cathodes of the fuel cells are accessible from an outside of the plenum, and the anodes of the fuel cells are accessible from within the plenum. 3. The fuel cell apparatus according to claim 1 wherein the plenum is defined between the first flexible array and a flexible sheet sealed to the first flexible array by a seal extending around a periphery of the plenum. 4. The fuel cell apparatus according to claim 3 wherein areas of the first flexible array and flexible sheet are different. 5. The fuel cell apparatus according to claim 3 wherein, on a cross section of the plenum, a distance between first and second opposed portions of the seal measured along the first flexible array is different from a distance between the first and second seal portions measured along the flexible sheet. 6. The fuel cell apparatus according to claim 5 wherein the distance between the first and second seal portions measured along the first flexible array is shorter than the distance between the first and second seal portions measured along the flexible sheet. 7. The fuel cell apparatus according to claim 5 wherein the distance between the first and second seal portions measured along the first flexible array is longer than the distance between the first and second seal portions measured along the flexible sheet. 8. The fuel cell apparatus according to claim 1 wherein the plenum is generally rectangular in a plane of the first flexible array. 9. The fuel cell apparatus according to claim 1 wherein the plenum is generally round in a plane of the first flexible array. 10. The fuel cell apparatus according to claim 1 wherein the inlet comprises a tube sealed between the first flexible array and the flexible sheet. 11. The fuel cell apparatus according to claim 1 wherein the inlet comprises an aperture in one of the first flexible array and the flexible sheet. 12. The fuel cell apparatus according to claim 1 comprising a gas permeable porous medium disposed between the first flexible array and the external support structure. 13. The fuel cell apparatus according to claim 1 wherein the external support structure comprises a gas-permeable porous medium. 14. The fuel cell apparatus according to claim 13 wherein the porous medium is hydrophobic. 15. The fuel cell apparatus according to claim 14 wherein the porous medium comprises a porous PTFE material. 16. The fuel cell apparatus according to claim 1 wherein the external support structure comprises a plurality of spaced-apart projections and the projections limit expansion of the plenum. 17. The fuel cell apparatus according to claim 16 wherein the projections comprise ribs. 18. The fuel cell apparatus according to claim 1 wherein the external support structure comprises openings to permit air to pass therethrough. 19. The fuel cell apparatus according to claim 1 wherein the external support structure comprises a portion of an outer housing of a portable device. 20. The fuel cell apparatus according to claim 1 wherein the external support structure comprises a portion of an outer housing of a portable device selected from the group consisting of: telephones; music players, video players, cameras, video cameras, radios, navigation devices, lights, electronic games, computers, and, personal digital assistants. 21. The fuel cell apparatus according to claim 3, wherein the flexible sheet is a second flexible two-dimensional fuel cell array. 22. The fuel cell apparatus according to claim 1, further including a gas permeable material arranged within the plenum. 23. The fuel cell apparatus according to claim 22, wherein the gas permeable material absorbs contaminants from fuel gas flowing through the plenum. 24. The fuel cell apparatus according to claim 1, wherein the flexible walls include projections within the plenum that hold the flexible walls apart. 25. The fuel cell apparatus according to claim 1, wherein the current-carrying structures embedded within the two-dimensional fuel cell array carry electrons through the array from the anodes accessible from the first side of the first flexible array to the cathodes accessible from the second side of the first flexible array. 26. The fuel cell apparatus according to claim 1, wherein a reactant is inside of the plenum. 27. The fuel cell apparatus according to claim 1, wherein at least a portion of the current-carrying structures are disposed between the anodes accessible from the first side of the first flexible array and the cathodes accessible from the second side of the first flexible array.