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@ARTICLE{Holderer:172220,
      author       = {Holderer, O. and Ivanova, O. and Hopfenmüller, B. and
                      Zamponi, M. and Maier, W. and Majerus, Anne and Lehnert, W.
                      and Monkenbusch, M. and Zorn, R.},
      title        = {{O}bserving proton motion on the nanoscale in polymeric
                      electrolyte membranes with quasielastic neutron scattering},
      journal      = {International journal of hydrogen energy},
      volume       = {39},
      number       = {36},
      issn         = {0360-3199},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2014-05709},
      pages        = {21657–21662},
      year         = {2014},
      abstract     = {The mechanism of proton conductivity in high temperature
                      polymer electrolyte fuel cells (HT-PEFCs) has been
                      investigated with macroscopic conductivity measurements and
                      on a microscopic scale with quasielastic neutron scattering
                      techniques. Polybenzimidazole membranes, which are used in
                      HT-PEFCs, are doped with phosphoric acid (PA) to achieve the
                      desired proton conductivity. Neutron spin echo experiments
                      showed that the polymer matrix is very rigid incoherent
                      scattering experiments, but incoherent scattering revealed
                      rather fast diffusion processes, compatible with macroscopic
                      conductivity measurements. The measured diffusion is faster
                      than anticipated from the conductivity of a phosphoric acid
                      doped PBI membrane, but slower than that expected for pure
                      phosphoric acid. Over larger distances the fractal polymer
                      membrane network slows down the locally fast diffusion to
                      the macroscopic values. With elastic fixed window scans on a
                      backscattering spectrometer an activation energy of 7.6
                      kJ/mol is obtained at typical conditions in an HT-PEFC.},
      cin          = {Neutronenstreuung ; JCNS-1 / IEK-3 / JCNS (München) ;
                      Jülich Centre for Neutron Science JCNS (München) ;
                      JCNS-FRM-II / ICS-1},
      ddc          = {660},
      cid          = {I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)IEK-3-20101013 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)ICS-1-20110106},
      pnm          = {54G - JCNS (POF2-54G24) / 451 - Soft Matter Composites
                      (POF2-451)},
      pid          = {G:(DE-HGF)POF2-54G24 / G:(DE-HGF)POF2-451},
      experiment   = {EXP:(DE-MLZ)SPHERES-20140101 / EXP:(DE-MLZ)J-NSE-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000347576200086},
      doi          = {10.1016/j.ijhydene.2014.09.018},
      url          = {https://juser.fz-juelich.de/record/172220},
}