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@PHDTHESIS{Borgardt:891876,
      author       = {Borgardt, Elena},
      title        = {{M}echanische {E}igenschaften von katalysatorbeschichteten
                      {M}embranen für die {P}olymer-{E}lektrolyt-{M}embran
                      {E}lektrolyse},
      journal      = {Anatomical science international},
      volume       = {533},
      issn         = {-},
      school       = {RWTH Aachen},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2021-01789},
      isbn         = {978-3-95806-533-8},
      series       = {Schriften des Forschungszentrums Jülich. Reihe Energie
                      $\&$ Umwelt / Energy $\&$ Environment},
      pages        = {viii, 181 S.},
      year         = {2021},
      note         = {RWTH Aachen, Diss., 2020},
      abstract     = {With the aim of substituting fossil fuels, the expansion of
                      renewable electricity generation in Germany hasbeen strongly
                      promoted in recent years. Due to weather conditions,
                      electricity from wind and solar poweris subject to high
                      fluctuation, so it is necessary to develop efficient storage
                      options for electricity. One possibility is to store
                      electricity in the form of hydrogen, which is generated by
                      the electrolysis technology from renewable electricity. The
                      polymer electrolyte membrane electrolysis is particularly
                      suitable for this purpose. It works dynamically and can
                      react quickly to the fluctuating input power. At present,
                      this technology is still being worked on in terms of cost
                      reduction, increased efficiency and longevity. Inparticular,
                      the optimization of the catalyst coated membrane, typically
                      Nafion$^{©}$ with iridium on the anode side and platinum on
                      the cathode side, offers the potential to provide an
                      improvement in these three areas. With regard to the
                      mechanical properties, however, there is hardly any
                      understanding so far. The aim of this work is therefore to
                      analyze the mechanical properties of catalyst coated
                      membranes and then to investigate the influence of these
                      mechanical properties on cell performance. The work is
                      divided into two parts: ex-situ and in-situ experiments. To
                      investigate the relevant mechanical properties of catalyst
                      coated membranes, ex-situ compression tests, swelling tests,
                      stress relaxation experiments and creep tests under
                      electrolysis conditions and under compression were carried
                      out. For the in situ experiments, a pressure cell was
                      developed with which it was possible to transfer clamping
                      pressure via a stamp directly to the active cell area. In
                      addition, different cell designs could be compared. The ex
                      situ experiments showed a viscoelastic behavior for
                      Nafion$^{©}$ and catalyst coated Nafion$^{©}$ under
                      electrolysis conditions. The viscosity of catalyst coated
                      membranes is 38 \% lower. In the in situ experiments it
                      could subsequently be proved that these viscoelastic
                      properties have an influence on the cell performance. Due to
                      the compression of the membrane, a loss of water occurs,
                      which results in the performance being reduced above an
                      optimum clamping pressure of 2.5 MPa. The time dependence of
                      the compression after a pressure change, the swelling
                      pressure and the stress relaxation also lead to a change in
                      clamping pressure and thus performance over time. By
                      constructive solutions clamping pressure must be kept
                      constant in the cell.},
      cin          = {IEK-14},
      ddc          = {610},
      cid          = {I:(DE-Juel1)IEK-14-20191129},
      pnm          = {134 - Electrolysis and Hydrogen (POF3-134) / 1231 -
                      Electrochemistry for Hydrogen (POF4-123)},
      pid          = {G:(DE-HGF)POF3-134 / G:(DE-HGF)POF4-1231},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:0001-2021051014},
      url          = {https://juser.fz-juelich.de/record/891876},
}