METAL FOIL

1 . Metal foil for the catalytic production of hydrogen, having the following chemical composition (in wt.-%):

C 0.001 to 0.5%

S max. 0.008%

N 0.1 to 0.3%

Cr 24 to 28%

Ni 30 to 33%

Mn 1.0 to 2.0%

Si 0.005 to 0.2%

Mo 6.0 to 7.5%

Ti max. 0.05%

Nb max. 0.05%

Cu 0.8 to 2.0%

P max. 0.025%

Al max. 0.2%

Cerium MM 0.01 to 0.1%

W max. 0.5%

Co max. 0.5%

B 0.001 to 0.05%

Fe remainder

and contaminants resulting from production.

2 . Metal foil according to claim 1 , having the following composition (in wt.-%):

C 0.001 to 0.02%

S max. 0.005%

N 0.15 to 0.25%

Cr 26 to 27.5%

Ni 31 to 32%

Mn 1.2 to <2.0%

Si 0.01 to <0.1%

Mo 6.0 to 7.0%

Ti max. 0.05%

Nb max. 0.05%

Cu 1.0 to <2.0%

max. 0.02%

Al max. 0.15%

Cerium MM 0.02 to <0.1%

W max. 0.3%

Co max. 0.5%

B 0.001 to 0.01%

Fe remainder

and contaminants resulting from production.

3 . Method for the production of a metal foil according to claim 1 , which is brought to a final thickness <1.0 mm by means of mechanical cold forming and/or hot forming of a semi-finished product, if necessary with at least one heat/annealing treatment.

4 . Method according to claim 3 , wherein rollers, particularly hard metal rollers, are used for the mechanical shaping to produce foils <1.0 mm.

5 . Method according to claim 3 , wherein hard metal rollers having a roughness Ra <0.5 μm are used for rolling foils to final thicknesses <1.0 mm.

6 . Method according to claim 3 , wherein the foils are degreased with an electrolyte stripper before an annealing process.

7 . Method according to claim 3 , wherein rolling oil is used during the course of the rolling process to a final thickness <1.0 mm, whereby then, a rolling oil film having a film thickness that can be predetermined remains on the foil surface at the end of rolling.

8 . Method according to claim 3 , wherein the foil is thermally treated, subsequent to the mechanical shaping, for a time of 5 to 60 minutes, at a temperature of 500 to 1000° C., under an atmosphere that contains oxygen.

9 . Method according to claim 3 , wherein the metal foil is thermally treated in a muffle furnace, during a time of 5 to 40 minutes, at a temperature of 550 to 950° C., under an atmosphere that contains oxygen.

10 . Method according to claim 3 , wherein an oxide layer having a defined layer thickness can be adjusted on the foil surface, as a function of the foil thickness and the type of thermal treatment.

11 . Use of a metal foil according to claim 1 as a solid metal catalyst for the production of hydrogen from an aqueous solution, in interaction with a light source.

12 . Use of a metal foil according to claim 1 as a solid metal catalyst for the production of hydrogen from an aqueous solution, in interaction with sunlight.