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Various systems, method and apparatuses are disclosed that include a pressure swing adsorption apparatus coupled to a fuel cell, wherein the fuel cell receives at least a portion of a product gas from the pressure swing adsorption and powers the pressure swing adsorption apparatus. Also disclosed is

Various systems, method and apparatuses are disclosed that include a pressure swing adsorption apparatus coupled to a fuel cell, wherein the fuel cell receives at least a portion of a product gas from the pressure swing adsorption and powers the pressure swing adsorption apparatus. Also disclosed is a portable gas separator that include a housing that houses a rotary pressure swing adsorption apparatus.

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1. A system, comprising:a pressure swing adsorption apparatus that can produce a product gas and that defines a product gas outlet; and a fuel cell power source powering the pressure swing adsorption apparatus and defining a cathode feed inlet, the product gas outlet being fluidly coupled to the cat

1. A system, comprising:a pressure swing adsorption apparatus that can produce a product gas and that defines a product gas outlet; and a fuel cell power source powering the pressure swing adsorption apparatus and defining a cathode feed inlet, the product gas outlet being fluidly coupled to the cathode feed inlet of the fuel cell power source to deliver at least a portion of the product gas to the fuel cell power source. 2. The system according to claim 1, wherein the pressure swing adsorption apparatus comprises a rotary pressure swing adsorption apparatus.3. The system according to claim 2, wherein the rotary pressure swing adsorption apparatus comprises a rotary bed pressure swing adsorption apparatus.4. The system according to claim 3, wherein the fuel cell power source powers the rotation of the rotary beds.5. The system according to claim 2, wherein the rotary pressure swing adsorption apparatus comprises a rotary valve pressure swing adsorption apparatus.6. The system according to claim 5, wherein the fuel cell power source powers the rotation of the rotary valves.7. The system according to claim 2, wherein the pressure swing adsorption apparatus further comprises a plurality of adsorbers and a plurality of valve systems cooperating with the adsorbers such that at least one first gas stream is supplied to the adsorbers and at least one second gas stream is withdrawn from the adsorbers, wherein the adsorbers and the valve systems both rotate.8. The system according to claim 1, wherein the product gas comprises a gas that is enriched in oxygen relative to air.9. The system according to claim 1, wherein the pressure swing adsorption apparatus further comprises at least one compressor and at least one exhauster and the fuel cell power source powers the compressor and the exhauster.10. The system according to claim 1, wherein the pressure swing adsorption apparatus further comprises:a stator; and an adsorber rotor rotatable relative to the stator about a rotation axis, wherein the adsorber rotor includes 2 to 10 adsorbers angularly spaced about the rotation axis. 11. The system according to claim 10, further comprising:a first valve face between the stator and the adsorber rotor that defines at least one feed gas port and at least one exhaust gas port; and a second valve face between the stator and the adsorber rotor that defines at least one product gas port; wherein the adsorbers can fluidly couple to the first valve surface and the second valve surface. 12. The system according to claim 1, wherein the fuel cell is selected from a polymer electrolyte membrane fuel cell, an alkaline fuel cell or a solid oxide fuel cell.13. The system according to claim 1, wherein the fuel cell comprises a direct methanol fuel cell.14. A system, comprising:a pressure swing adsorption apparatus that can produce a product gas; at least one motor coupled to the pressure swing adsorption apparatus; and a fuel cell that receives at least a portion of the product gas; and a power line coupled between the fuel cell and the motor. 15. The system according to claim 14, wherein the motor drives at least one component of the pressure swing adsorption apparatus selected from a rotary adsorber bed, a rotary valve, a compressor, and an exhauster.16. The system according to claim 14, wherein the product gas comprises a gas that is enriched in oxygen relative to air and the fuel cell includes a cathode that receives the product gas.17. The system according to claim 14, wherein the pressure swing adsorption apparatus comprises a rotary bed pressure swing adsorption apparatus that includes a rotary adsorber bed, at least one compressor, and at least one exhauster, and wherein the motor drives the rotary adsorber bed, the compressor, and the exhauster.18. The system according to claim 14, wherein the pressure swing adsorption apparatus comprises a rotary valve pressure swing adsorption apparatus that includes a rotary valve, at least one compressor, and at least one exhauster, and wherein the motor drives the rotary valve, the compressor, and the exhauster.19. The system according to claim 14, wherein the fuel cell is selected from a polymer electrolyte membrane fuel cell, an alkaline fuel cell or a solid oxide fuel cell.20. The system according to claim 14, wherein the fuel cell comprises a direct methanol fuel cell.21. A portable gas separator, comprising:a housing; a rotary pressure swing adsorption apparatus housed by the housing that can produce a product gas; a motor coupled to the rotary pressure swing adsorption apparatus; a fuel cell that receives at least a first portion of the product gas; and a power line coupled between the fuel cell and the motor. 22. The gas separator according to claim 21, wherein the rotary pressure swing adsorption apparatus defines a product gas outlet for delivering the product gas and the fuel cell defines a cathode inlet, the product gas outlet being fluidly coupled to the cathode inlet port of the fuel cell.23. The gas separator according to claim 21, wherein the rotary pressure swing adsorption apparatus comprises:a stator; and an adsorber rotor rotatable relative to the stator about a rotation axis, wherein the adsorber rotor includes 2 to 10 adsorbers angularly spaced about the rotation axis. 24. The gas separator according to claim 23, wherein the adsorbers are equally spaced about the rotation axis.25. The gas separator according to claim 23, further comprising:a first valve face between the stator and the adsorber rotor that defines at least one feed gas port and at least one exhaust gas port; and a second valve face between the stator and the adsorber rotor that defines at least one product gas port; wherein the adsorbers can fluidly couple to the first valve surface and the second valve surface. 26. The gas separator according to claim 25, wherein the product gas port is fluidly coupled to an inlet port of the fuel cell.27. The gas separator according to claim 23, wherein the rotary pressure swing apparatus further comprises a buffer chamber fluidly coupled to the adsorbers.28. The gas separator according to claim 21, wherein the product gas comprises a gas that is enriched in oxygen relative to air.29. The gas separator according to claim 28, wherein a second portion of the product gas is supplied to a human being.30. The gas separator according to claim 21, wherein first portion of the product gas is supplied directly to the fuel cell.31. The gas separator according to claim 21, wherein the fuel cell is selected from a membrane-based fuel cell, an alkaline fuel cell and a solid oxide fuel cell.32. The gas separator according to claim 21, wherein the rotary pressure swing adsorption apparatus includes at least one zeolite adsorbent material.33. The gas separator according to claim 32, wherein the zeolite adsorbent material comprises at least one lithium-exchanged zeolite.34. The gas separator according to claim 21, wherein the rotary pressure swing adsorption apparatus includes two or more different adsorbent materials.35. The gas separator according to claim 21, wherein the rotary pressure swing adsorption apparatus includes at least two adsorbers wherein a first adsorber includes a first adsorbent material and a second adsorber includes a second adsorbent material.36. The system according to claim 21, wherein the fuel cell is selected from a polymer electrolyte membrane fuel cell, an alkaline fuel cell or a solid oxide fuel cell.37. The system according to claim 21, wherein the fuel cell comprises a direct methanol fuel cell.38. A portable oxygen concentrator, comprising:a rotary pressure swing adsorption apparatus that can produce an oxygen-enriched gas; a motor coupled to the rotary pressure swing adsorption apparatus; a fuel cell that can provide an electrical current to the motor and that receives at least a first portion of the oxygen-enriched gas; and a first user supply line fluidly coupled to the rotary pressure swing apparatus that can supply at least a second portion of the oxygen-enriched gas to a human being. 39. The concentrator according to claim 38, further comprising a conduit fluidly coupling the first user supply line with a cathode exhaust outlet of the fuel cell.40. The concentrator according to claim 38, further comprising a second user supply line fluidly coupled to a cathode exhaust outlet of the fuel cell that can supply the cathode exhaust to a human being.41. The concentrator according to claim 40, further comprising a hydrogen sensor coupled to the second user supply line.42. The concentrator according to claim 38, wherein the fuel cell includes a cathode that produces an exhaust stream that includes water vapor and that defines a cathode exhaust outlet, the concentrator further comprising:a first conduit fluidly coupling the cathode exhaust outlet of the fuel cell with a water separator to remove at least portion of the water vapor; and a second conduit fluidly coupling the water separator and the first user supply line to supply the water vapor to the human being. 43. The concentrator according to claim 38, wherein the oxygen-enriched gas comprises at least about 95 volume percent oxygen.44. The concentrator according to claim 38, further comprising a hydrogen storage container fluidly coupled to the fuel cell.45. The concentrator according to claim 38, further comprising an oxygen sensor coupled to the first user supply line.46. A gas separation method, comprising:introducing a feed gas into a pressure swing adsorption apparatus to produce a product gas; introducing at least a portion of the product gas into a fuel cell; and generating an electrical current from the fuel cell to power the pressure swing adsorption apparatus. 47. The method according to claim 46, wherein the pressure swing adsorption apparatus comprises a stator and a rotor housing a plurality of absorbers, the method further comprising rotating the rotor relative to the stator through a rotation period to define a pressure swing adsorption cycle.48. The method according to claim 47, wherein the rotor houses n adsorbers that are angularly positioned about a rotation axis defined by the rotor.49. The method according to claim 48, wherein the rotor has a rotation period of substantially 1/n to define the pressure swing adsorption cycle.50. The method according to claim 46, wherein the pressure swing adsorption apparatus comprises a valve and a body housing a plurality of adsorbers, the method further comprising rotating the valve relative to the body through a rotation period to define a pressure swing adsorption cycle.51. The method according to claim 46, wherein the feed gas comprises air.52. The method according to claim 46, wherein the product gas comprises a gas enriched in oxygen relative to air, and the method further comprises introducing the product gas into a cathode inlet defined by the fuel cell.53. The method according to claim 46, further comprising providing the fuel cell with a mixture of at least one second gas and the product gas.54. The method according to claim 53, wherein the second gas comprises air, water vapor, or a mixture thereof.55. The method according to claim 46, further comprising supplying the electrical current to a motor that is coupled to the pressure swing adsorption apparatus.56. The method according to claim 46, wherein the feed gas comprises a more readily adsorbed component and a less readily adsorbed component, the more readily adsorbed component preferentially adsorbing to adsorbent material under increased pressure to provide the product gas enriched in the less readily adsorbed component.57. The method according to claim 46, wherein about 10 to about 30 volume percent of the product gas is introduced into the fuel cell.58. A method for providing oxygen-enriched gas to a human being, comprising:introducing a feed gas into a pressure swing adsorption apparatus to produce a product gas that is enriched in oxygen relative to air; introducing at least a first portion of the product gas into a fuel cell; generating an electrical current from the fuel cell to power the pressure swing adsorption apparatus; and providing at least a second portion of the product gas to a human being. 59. The method according to claim 58, further comprising providing a mixture of at least one second gas and the product gas to the fuel cell.60. The method according to claim 59, wherein the second gas is selected from air, water vapor, or a mixture thereof.61. The method according to claim 58, where the fuel cell produces a cathode exhaust stream that includes water vapor, the method further comprising separating at least a portion of the water vapor from the cathode exhaust stream and mixing the water vapor with the product gas prior to providing the product gas to the human being.62. The method according to claim 58, wherein the fuel cell generates about 25 watts to about 1 kilowatt to power the pressure swing adsorption apparatus.63. The method according to claim 58, wherein product gas volume is from about 1 to about 2 liters per minute.64. The method according to claim 58, wherein the pressure swing adsorption apparatus comprises a rotary pressure swing adsorption apparatus.65. The method according to claim 58, further comprising supplying the electrical current to a motor that is coupled to the pressure swing adsorption apparatus.66. The method according to claim 58, wherein the product gas comprises at least about 95 volume percent oxygen.67. The method according to claim 58, wherein about 10 to about 30 volume percent of the product gas is introduced into the fuel cell.68. A method for providing oxygen-enriched gas to a human being, comprising:introducing a feed gas into a pressure swing adsorption apparatus to produce a product gas that is enriched in oxygen relative to air; introducing at least a first portion of the product gas into a fuel cell to produce a cathode exhaust gas that is enriched in oxygen relative to air; generating an electrical current from the fuel cell to power the pressure swing adsorption apparatus; and introducing at least a portion of the cathode exhaust gas to a human being. 69. A system, comprising:a pressure swing adsorption apparatus that can produce a product gas that is enriched in oxygen relative to air; at least one motor coupled to the pressure swing adsorption apparatus; and a fuel cell that can provide an electrical current to the motor and that includes a cathode that receives at least a portion of the product gas. 70. A portable gas separator, comprising:a housing; a rotary pressure swing adsorption apparatus housed by the housing that can produce a product gas, and that defines a product gas outlet for delivering the product gas; a motor coupled to the rotary pressure swing adsorption apparatus; and a fuel cell that can provide an electrical current to the motor and that defines a cathode inlet that is fluidly coupled to the product gas outlet so that the fuel cell receives at least a portion of the product gas. 71. A portable gas separator, comprising:a housing; a rotary pressure swing adsorption apparatus housed by the housing that can produce a product gas that is enriched in oxygen relative to air; a motor coupled to the rotary pressure swing adsorption apparatus; and a fuel cell that can provide an electrical current to the motor and that receives at least a portion of the product gas.