| 摘要 |
The invention relates to an electrode-electrolyte unit for a fuel cell, especially a direct methanol fuel cell comprising a barrier layer between two electrolyte layers. Said barrier layer enables transmission of protons but prevents the transfer of additional substances, especially methanol, to the side of the cathode. Barrier layer materials in prior art are palladium-silver-alloys which are very cost-intensive or vanadium, nickel and titanium based metal hydrides. The utilisation thereof in the case of polymer membranes involves a higher risk of corrosion. The barrier layer unit (3) comprises a barrier layer (4) consisting of electroconductive carbon. When the layers are thin, the barrier layer (4) is sufficiently permeable for atomic or molecular hydrogen and is, at the same time, sufficiently permeable for additional substances, e.g. methanol or water. |
