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@PHDTHESIS{Sievert:1055037,
      author       = {Sievert, Tim},
      title        = {{E}ntwicklung von {K}orrosionsschutzschichten für
                      {P}rotonen-{A}ustausch-{M}embran-{W}asserelektrolyseure},
      volume       = {694},
      school       = {Bochum},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2026-01834},
      isbn         = {978-3-95806-888-9},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {201},
      year         = {2026},
      note         = {Dissertation, Bochum, 2025},
      abstract     = {Since renewable energy sources supply electricity with
                      temporal fluctuations, efficient energy storage methods play
                      a key role in bridging the gap between generation and
                      consumption. Proton exchange membrane water electrolysis
                      (PEM electrolysis) represents a central technical solution
                      in this context. However, its main disadvantage compared to
                      fossil hydrogen production lies in the high investment
                      costs, which are primarily due to corrosion-resistant
                      components made of titanium with noble metal coatings. In
                      particular, bipolar plates (BPP) and porous transport layers
                      (PTL) account for around two thirds of the system costs. The
                      aim of this work is to reduce the capital costs of PEM
                      electrolysers by developing suitable corrosion protection
                      coatings. For this purpose, PTLs made of stainless steel
                      expanded metals are coated with titanium to investigate
                      whether they can replace conventional PTLs made entirely of
                      titanium. In addition, noble-metal-free coatings are being
                      developed to completely substitute the noble metal layers
                      used so far. Metals, nitrides, alloys and conductive oxides
                      are considered as potential coating materials. Different
                      types of PTLs (felts, expanded metals, sintered bodies) as
                      well as different coating methods are investigated. The
                      focus is on thermal spraying (TS) and magnetron sputtering
                      (MS). In addition, corrosion tests are conducted to evaluate
                      both materials and process parameters. The results of PEM
                      electrolysis experiments carried out at IET-4 show that Ti
                      coatings deposited by cold gas spraying on stainless steel
                      expanded metals can achieve almost identical current
                      densities as conventional titanium-felt-based PTLs and can
                      be operated stably for more than 1000 hours. Furthermore,
                      titanium alloys with niobium or tantalum were produced by
                      magnetron sputtering, which form conductive oxide films
                      under corrosive electrolysis conditions. Initial tests show
                      stable current density over a period of 144 hours.
                      Transmission electron microscopy (TEM) also confirmed the
                      successful incorporation of niobium into the titanium oxide
                      layer. These findings support the hypothesis that targeted
                      doping can significantly increase the conductivity of the
                      forming oxide layers and that noble metal free corrosion
                      protection coatings can be used in PEM electrolysers.},
      cin          = {IMD-2},
      cid          = {I:(DE-Juel1)IMD-2-20101013},
      pnm          = {1241 - Gas turbines (POF4-124)},
      pid          = {G:(DE-HGF)POF4-1241},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      doi          = {10.34734/FZJ-2026-01834},
      url          = {https://juser.fz-juelich.de/record/1055037},
}