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Fuel cell fuel supplies having single and multiple compartments for storing and containing fuel cell fuel precursor reagents. These fuel supplies allow storage and packaging of precursors for in situ production and use of fuel cell fuel. A method for making fuel cell fuel and a fuel cell system is

Fuel cell fuel supplies having single and multiple compartments for storing and containing fuel cell fuel precursor reagents. These fuel supplies allow storage and packaging of precursors for in situ production and use of fuel cell fuel. A method for making fuel cell fuel and a fuel cell system is also disclosed.

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We claim: 1. A fuel supply for a fuel cell allowing in situ production of fuel, comprising: a first compartment that contains a first precursor reagent; and a second compartment that contains a second precursor reagent; wherein the contents of the first compartment and the second compartment are mi

We claim: 1. A fuel supply for a fuel cell allowing in situ production of fuel, comprising: a first compartment that contains a first precursor reagent; and a second compartment that contains a second precursor reagent; wherein the contents of the first compartment and the second compartment are mixable to create a fuel for a fuel cell; and wherein the fuel created contains substantially no free hydrogen. 2. The fuel supply of claim 1 wherein the first compartment encases the second compartment. 3. The fuel supply of claim 1 wherein the first and second compartments are side-by-side. 4. The fuel supply of claim 1 wherein the first and second compartments are top and bottom compartments. 5. The fuel supply of claim 1 wherein the second compartment comprises a breakable or a pierceable component. 6. The fuel supply of claim 1 further comprising a third compartment that contains an additional amount of the second precursor reagent, an additional amount of the first precursor reagent, a third precursor reagent, or a catalyst. 7. The fuel supply of claim 1 wherein the fuel comprises methanol. 8. The fuel supply of claim 7 wherein the first precursor reagent comprises dimethyl dicarbonate. 9. The fuel supply of claim 7 wherein the second precursor reagent comprises water. 10. The fuel supply of claim 1 wherein the fuel comprises borohydride. 11. The fuel supply of claim 10 wherein the first precursor reagent comprises a borane-containing polymer. 12. The fuel supply of claim 10 wherein the second reagent comprises carbonate. 13. The fuel supply of claim 1 wherein the fuel comprises ammonia borane. 14. The fuel supply of claim 13 wherein the first precursor reagent comprises a borane-containing polymer. 15. The fuel supply of claim 13 wherein the second reagent comprises ammonia. 16. The fuel supply of claim 1 wherein the fuel comprises hydrazine. 17. The fuel supply of claim 16 wherein the first precursor reagent comprises an azine, hydrogen peroxide, or ammonia. 18. The fuel supply of claim 1 wherein the fuel supply is connectable to a fuel cell system. 19. The fuel supply of claim 1 wherein the second compartment is detachable. 20. The fuel supply of claim 19, wherein the second compartment comprises a weakened section. 21. The fuel supply of claim 20, wherein the weakened section has a thickness less than a thickness of the second compartment. 22. The fuel supply of claim 1, wherein the fuel created is convertible to hydrogen. 23. The fuel supply of claim 1 wherein the fuel supply is substantially free of fuel prior to the in situ mixing of the first precursor reagent and the second precursor reagent. 24. A fuel cell fuel system, comprising: a fuel supply having a first compartment that contains a first precursor reagent; and a second compartment that contains a second precursor reagent; wherein the contents of the first compartment and the second compartment are mixable to create a fuel for a fuel cell; and wherein the fuel created contains substantially no free hydrogen. 25. The fuel cell fuel system of claim 24 wherein the second compartment is part of the fuel supply. 26. A fuel supply for a fuel cell allowing in situ production of fuel, comprising: a first compartment that contains a first precursor reagent; and a second compartment that contains a second precursor reagent; wherein the contents of the first compartment and the second compartment are mixable to create a fuel for a fuel cell; and wherein the fuel created is selected from the group consisting of borohydride, ammonia borane, and hydrazine. 27. The fuel supply of claim 26 wherein the fuel is borohydride, and wherein the first precursor reagent comprises a borane-containing polymer and the second precursor reagent comprises carbonate. 28. The fuel supply of claim 26 wherein the fuel is ammonia borane, and wherein the first precursor reagent comprises a borane-containing polymer and the second precursor reagent comprises ammonia. 29. The fuel supply of claim 26 wherein the fuel is hydrazine, and wherein the first precursor reagent comprises an azine, hydrogen peroxide, or ammonia. 30. A fuel supply for a fuel cell allowing in situ production of fuel, comprising: a first compartment that contains dimethyl dicarbonate; and a second compartment that contains water; wherein the contents of the first compartment and the second compartment are mixable to create methanol.