FemtoPEM

In FemtoPEM, a newly developed surface functionalization consisting of femtosecond laser structuring and physical vapor deposition (PVD) is used to the electrical contact and mass transport resistances of the porous transport layers (PTL) will be significantly minimized and the service life of proton exchange membrane (PEM) water electrolysers will be increased. Building on preliminary proof-of-concept work, the aim is to optimize the laser structuring and PVD coating of the titanium-based PTL surfaces. This optimization will be validated in experimental electrolysis tests on a laboratory scale using advanced electrochemical characterization methods. In addition, a direct, process-related link between laser structuring and PVD coating will be investigated and prepared for use as a porous transport electrode (PTE).

Supplementary physical measurement methods and model-theoretical descriptions, including an energetic analysis, form the basis for rapid further development and the targeted transfer to industry. The aim is to reduce electrical contact resistances by at least 40% and mass transport resistances by at least 55% while increasing service life. This optimization is to be assigned qualitatively and quantitatively to the specific overvoltages together with the key parameters. In addition, the transfer of the newly developed surface functionalization to industry-relevant processes is to be prepared.

Hydrogen production costs depend on electricity costs for about 70% and thus on the conversion efficiency of the electrolyzer. Therefore, the targeted material improvements directly lead to lower production costs for green hydrogen and contribute to a more affordable and sustainable establishment of a chemical energy carrier as well as to a successful energy transition.