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The invention, in various embodiments, provides planar fuel cell stack of a plurality of fuel cells, comprising an anode layer including a first anode and a second anode, an electrolyte layer, a cathode layer including a first cathode and a second cathode, and at least one interconnect at least part

The invention, in various embodiments, provides planar fuel cell stack of a plurality of fuel cells, comprising an anode layer including a first anode and a second anode, an electrolyte layer, a cathode layer including a first cathode and a second cathode, and at least one interconnect at least partially disposed within the electrolyte layer, and electrically and mechanically coupling the first anode and the second cathode. In various embodiments, structural supports are provided, the fuel cells are sized to be portable, and are manufactured to produce desired power densities and/or voltages.

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What is claimed is: 1. A planar fuel cell stack of a plurality of fuel cells comprising: an anode layer including a first anode and a second anode, an electrolyte layer, a cathode layer including a first cathode and a second cathode, at least one interconnect at least partially disposed within, and

What is claimed is: 1. A planar fuel cell stack of a plurality of fuel cells comprising: an anode layer including a first anode and a second anode, an electrolyte layer, a cathode layer including a first cathode and a second cathode, at least one interconnect at least partially disposed within, and interfacing with, the electrolyte layer, and electrically and mechanically coupling the first anode and the second cathode, and a structural support having an axis oriented perpendicular to a plane extending through the planar stack, the structural support coupled to one of the anode layer and the cathode layer in at least a portion of an inactive region of the stack, wherein the structural support is dimensioned so as to leave substantially uncovered an active region of the stack laterally adjacent to the structural support. 2. The fuel cell stack of claim 1, wherein the plurality of fuel cells operate at a temperature of more than about 400 degrees Celsius. 3. The fuel cell stack of claim 1, further comprising a second structural support having an axis oriented perpendicular to a plane extending through the planar stack, the second structural support coupled to one of the anode layer and the cathode layer in at least a portion of a second inactive region of the stack, wherein the second structural support is dimensioned so as to leave substantially uncovered an active region of the stack laterally adjacent to the structural support and spaced apart from the structural support. 4. The fuel cell stack of claim 1, wherein the structural support includes an insulating material. 5. The fuel cell stack of claim 1, wherein the structural support includes an electrically insulating coating. 6. The fuel cell stack of claim 1, wherein the structural support includes an oxidized surface. 7. The fuel cell stack of claim 1, wherein the structural support includes one or more of a silicon material, a yttria stabilized zirconia (YSZ) material, a magnesium oxide material, a ferrochromium material, and a ceramic material. 8. The fuel cell stack of claim 1, wherein the structural support has a width of between about 30 microns and about 200 microns, and a height of greater than about 100 microns. 9. The fuel cell stack of claim 1, wherein at least a portion of the structural support is aligned with the at least one interconnect on an axis perpendicular to a plane extending through the fuel cell stack. 10. The stack of claim 1, wherein the first anode and the second anode are laterally separated by a first distance, the first cathode and the second cathode are laterally separated by a second distance, and at least one of the first distance and the second distance is between about 5 microns and about 500 microns. 11. The stack of claim 10, wherein at least one of the first distance and the second distance is between about 5 microns and about 200 microns. 12. The stack of claim 1, wherein the electrolyte layer includes a first electrolyte region disposed between the first anode and the first cathode and providing a first voltage differential between the first anode and the first cathode; a second electrolyte region disposed between the second anode and the second cathode and providing a second voltage differential between the second anode and the second cathode; and the first electrolyte region and the second electrolyte region comprise a monolithic electrolyte structure. 13. The stack of claim 1, comprising a solid-oxide fuel cell. 14. The stack of claim 1, further comprising a plurality of active regions, wherein the active regions comprise at least 70% of an area of a surface of the electrolyte layer. 15. The stack of claim 1, wherein the stack is contained within a housing having a volume of less than about 30 cubic centimeters. 16. The stack of claim 15, wherein the stack produces a voltage differential of more than about 10 volts. 17. The stack of claim 1, further comprising a plurality of interconnects at least partially disposed within, and interfacing with, the electrolyte layer, and electrically and mechanically coupling the first anode and the second cathode. 18. The stack of claim 1, including a plurality of interconnects that comprise a linear array of interconnects, wherein the center-to-center spacings of adjacent ones of the plurality of interconnects are substantially equal. 19. The stack of claim 1, wherein the at least one interconnect has a cross-section parallel to a plane extending through the electrolyte layer of less than about 100 microns2. 20. The stack of claim 1, further comprising three or more fuel cells electrically connected in series, wherein the three or more fuel cells comprise a non-linear array of fuel cells. 21. The stack of claim 1, further comprising two or more series electrical connections of the fuel cells coupled in a parallel electrical connection. 22. The stack of claim 1, wherein two adjacent electrodes have a space separating the adjacent electrodes and each adjacent electrode has an end facing the other adjacent electrode, each end adjacent to the space, wherein the structural support is at least partially disposed in the space between each end of the two adjacent electrodes and is coupled to the electrolyte layer. 23. The stack of claim 22, further comprising a second structural support having an axis oriented perpendicular to a plane extending through the planar stack, the second structural support coupled to one of the anode layer and the cathode layer in at least a portion of a second inactive region of the stack, wherein the second structural support is dimensioned so as to leave substantially uncovered an active region of the stack laterally adjacent to the structural support, wherein the second structural support is at least partially disposed between another two adjacent electrodes and is coupled to the electrolyte layer. 24. The stack of claim 22, wherein the plurality of fuel cells comprise solid oxide fuel cells. 25. The fuel cell stack of claim 22, wherein the structural support has a width of between about 30 microns and about 200 microns, and a height of greater than about 100 microns. 26. The stack of claim 22, wherein the first anode and the second anode are laterally separated by a first distance, the first cathode and the second cathode are laterally separated by a second distance, and at least one of the first distance and the second distance is between about 5 microns and about 500 microns. 27. The stack of claim 22, wherein the stack is contained within a housing having a volume of less than about 30 cubic centimeters. 28. The stack of claim 27, wherein the stack produces a voltage differential of more than about 10 volts. 29. A fuel cell assembly comprising: a housing having a volume of less than about 30 cubic centimeters, and a planar fuel cell stack contained in the housing and having an anode layer including a plurality of anodes arranged in a first plane, a cathode layer including a plurality of cathodes arranged in a second plane, an electrolyte layer disposed between the anode layer and the cathode layer, at least one interconnect at least partially disposed within, and interfacing with, the electrolyte layer, and coupled to a first anode and a first cathode, and a structural support having an axis oriented perpendicular to a plane extending through the planar stack, the structural support coupled to one of the anode layer and the cathode layer in at least a portion of an inactive region of the stack, wherein the structural support is dimensioned so as to leave substantially uncovered an active region of the stack laterally adjacent to the structural support. 30. The assembly of claim 29, wherein the planar fuel cell stack operates at a temperature of more than about 400 degrees Celsius. 31. The assembly of claim 29, wherein the planar fuel cell stack comprises solid oxide fuel cells. 32. The assembly of claim 29, wherein the active region comprises at least about 70% of an area of the surface of the electrolyte layer. 33. The assembly of claim 29, wherein the active regions comprise at least about 85% of an area of the surface of the electrolyte layer. 34. A fuel cell assembly comprising: a housing, and a planar fuel cell stack contained in the housing and having respective anodes arranged in an anode layer, respective cathodes arranged in a cathode layer, an electrolyte layer, at least one interconnect at least partially disposed within, and interfacing with, the electrolyte layer, and coupled to a first anode and a first cathode, and a structural support having an axis oriented perpendicular to a plane extending through the planar stack, the structural support coupled to one of the anode layer and the cathode layer in at least a portion of an inactive region of the stack, wherein the structural support is dimensioned so as to leave substantially uncovered an active region of the stack laterally adjacent to the structural support, wherein the fuel cell assembly produces more than about 0.1 volts per cubic centimeter of the housing. 35. The assembly of claim 34, wherein the planar fuel cell stack operates at a temperature of more than about 400 degrees Celsius. 36. The assembly of claim 34, wherein the planar fuel cell stack comprises solid oxide fuel cells. 37. The assembly of claim 34, wherein the fuel cell assembly produces more than about 0.5 volts per cubic centimeter of the housing. 38. The assembly of claim 34, wherein the housing has a volume of less than about 30 cubic centimeters. 39. A fuel cell assembly, comprising a housing having a volume of between about 0.1 cubic centimeters and about 30 cubic centimeters, and a planar fuel cell stack having an anode layer including a plurality of anodes arranged in a first plane, a cathode layer including a plurality of cathodes arranged in a second plane, an electrolyte layer disposed between the anode layer and the cathode layer, at least one interconnect at least partially disposed within, and interfacing with, the electrolyte layer, and coupled to a first anode and a first cathode, and a structural support having an axis oriented perpendicular to a plane extending through the planar stack, the structural support coupled to one of the anode layer and the cathode layer in at least a portion of an inactive region of the stack, wherein the structural support is dimensioned so as to leave substantially uncovered an active region of the stack laterally adjacent to the structural support, wherein-the active region has an area on a surface of the electrolyte layer of between about 0.5 square centimeters and about 100 square centimeters. 40. The fuel cell assembly of claim 39, wherein the planar fuel cell stack operates at a temperature of more than about 400 degrees Celsius. 41. The assembly of claim 39, wherein the planar fuel cell stack comprises solid oxide fuel cells. 42. The fuel cell stack of claim 1, wherein the structural support has an elongated dimension oriented perpendicular to the plane extending through the planar stack. 43. The fuel cell stack of claim 1, wherein the structural support is at least partially disposed between the first and the second anode and is coupled to one of the first cathode and the second cathode through the electrolyte layer. 44. The fuel cell stack of claim 1, wherein the structural support is at least partially disposed between the first and the second cathode and is coupled to one of the first anode and the second anode through the electrolyte layer.