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@ARTICLE{Becker:848044,
      author       = {Becker, Hans and Reimer, Uwe and Aili, David and Cleemann,
                      Lars N. and Jensen, Jens Oluf and Lehnert, Werner and Li,
                      Qingfeng},
      title        = {{D}etermination of {A}nion {T}ransference {N}umber and
                      {P}hosphoric {A}cid {D}iffusion {C}oefficient in {H}igh
                      {T}emperature {P}olymer {E}elctrolyte {M}embranes},
      journal      = {Journal of the Electrochemical Society},
      volume       = {165},
      number       = {10},
      issn         = {0013-4651},
      address      = {Pennington, NJ},
      publisher    = {Electrochemical Soc.},
      reportid     = {FZJ-2018-03334},
      pages        = {F863 - F869},
      year         = {2018},
      abstract     = {The passage of an electrical current through phosphoric
                      acid doped polymer membranes involves parasitic migration of
                      the acid, which imposes a critical issue for long-term
                      operation of the high temperature polymer electrolyte
                      membranes fuel cell (HT-PEMFC). To elucidate the phenomenon,
                      a three-layered membrane is constructed with embedded micro
                      reference electrodes to measure phosphoric acid
                      redistribution in a polybenzimidazole based membrane. Under
                      a constant load, a concentration gradient develops due to
                      the acid migration, which drives the back diffusion of the
                      acid and eventually reaches a steady state between migration
                      and diffusion. The acid gradient is measured as a difference
                      in local ohmic resistances of the anode- and cathode-layer
                      membranes by electrochemical impedance spectroscopy. The
                      phosphoric acid diffusion coefficient through the acid doped
                      membrane is about 10−11 m2 s−1, at least one order of
                      magnitude lower than that of aqueous phosphoric acid
                      solutions. The anion (H2PO4−) transference number is found
                      to range up to $4\%$ depending on current density,
                      temperature and atmospheric humidity of the cell, implying
                      that careful control of the operating parameters is needed
                      in order to suppress the vehicular proton conduction as a
                      degradation mitigation strategy.},
      cin          = {IEK-3 / IEK-14},
      ddc          = {660},
      cid          = {I:(DE-Juel1)IEK-3-20101013 / I:(DE-Juel1)IEK-14-20191129},
      pnm          = {135 - Fuel Cells (POF3-135)},
      pid          = {G:(DE-HGF)POF3-135},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000441061800113},
      doi          = {10.1149/2.1201810jes},
      url          = {https://juser.fz-juelich.de/record/848044},
}