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@ARTICLE{Schulte:830425,
      author       = {Schulte, Wiebke and Liu, Shuai and Plettenberg, Inka and
                      Kuhri, Susanne and Lüke, Wiebke and Lehnert, Werner and
                      Wittstock, Gunther},
      title        = {{L}ocal {E}valuation of {P}rocessed {M}embrane {E}lectrode
                      {A}ssemblies by {S}canning {E}lectrochemical {M}icroscopy},
      journal      = {Journal of the Electrochemical Society},
      volume       = {164},
      number       = {7},
      issn         = {0013-4651},
      address      = {Pennington, NJ},
      publisher    = {Electrochemical Soc.},
      reportid     = {FZJ-2017-03974},
      pages        = {F873 - F878},
      year         = {2017},
      abstract     = {Gas diffusion electrodes (GDEs) for high-temperature
                      polymer electrolyte fuel cells with different sizes of the
                      used binder particles were evaluated by scanning
                      electrochemical microscopy (SECM) with shear force (SF)
                      supplement. The SF data provide means of checking the
                      substrate morphology with respect to cracks formed during
                      the drying process and with respect to aggregates from used
                      binder of poly(fluoroethylene) (PTFE) simultaneously to the
                      electrochemical data. Electron microscopy results show that
                      a GDE prepared with smaller PTFE particles exhibits less
                      PTFE aggregation and more regular cracks. The SECM images
                      show a more homogeneous distribution and higher level of
                      oxygen reduction reaction activity for the GDE prepared with
                      smaller PTFE particles. The quantitative comparison is
                      enabled by the SF setup that maintains a constant working
                      distance toward the sample in the variant of the redox
                      competition mode, in which a cyclic voltammogram was
                      recorded for every grid position of the microelectrode
                      probe. Mass transport limitations of oxygen during the
                      experiment are avoided by dedicated shape of the
                      microelectrode body. Images of microelectrode currents at
                      specific potentials were extracted to map the local
                      electrocatalytic activity of the GDE. The GDEs were
                      processed to membrane electrode assemblies and applied in
                      HT-PEFC single cell tests. The polarization curve agree with
                      the SECM results that GDEs produced with smaller PTFE
                      particles favor the MEA performance.},
      cin          = {IEK-3},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-3-20101013},
      pnm          = {135 - Fuel Cells (POF3-135)},
      pid          = {G:(DE-HGF)POF3-135},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000404397300137},
      doi          = {10.1149/2.0061709jes},
      url          = {https://juser.fz-juelich.de/record/830425},
}