| abstract |
In bipolar plates for electrochemical cells, in particular for proton exchange membrane fuel cells, a metal substrate (1) having electrical contact resistance reduction on the surface, a metal substrate having a carbon fraction in the range of 50% to 100% and modified for the starting material Made of a carbon-based layer, layer system or boundary layer (3, 4, 5) mainly sp 2 bonded to the surface, where the surface area of the substrate is nitrided and / or nitrided by nitriding and / or carburizing Present in an edge layer made of carbon. The metal substrate has a structure configured to include ridges and / or depressions at each surface on surfaces in contact with the gas-permeable element in the electrochemical cell. |