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@ARTICLE{Wagner:875401,
      author       = {Wagner, Maximilian and Lorenz, Oliver and Lohmann-Richters,
                      Felix and Varga, Aron and Abel, Bernd},
      title        = {{O}n the {R}ole of {L}ocal {H}eating on {C}athode
                      {D}egradation during the {O}xygen {R}eduction {R}eaction in
                      {S}olid {A}cid {F}uel {C}ells},
      journal      = {Sustainable energy $\&$ fuels},
      volume       = {4},
      number       = {10},
      issn         = {2398-4902},
      address      = {Cambridge},
      publisher    = {Royal Society of Chemistry},
      reportid     = {FZJ-2020-02010},
      pages        = {5284-5293},
      year         = {2020},
      abstract     = {Reliable, stable, and long-term performance is one of the
                      most important requirements for fuel cells in general.
                      Widespread application of intermediate temperature solid
                      acid fuel cells is still hindered by relatively fast
                      degradation. However, durability studies are both expensive
                      as well as, by their nature, time consuming and therefore
                      rarely performed. In this study, we propose a viable method
                      to investigate degradation pathways on a practical time
                      scale. Five different types of electrodes were fabricated
                      with varying geometrical complexity, but all containing
                      platinum as the electrocatalyst. By utilizing small amounts
                      of well-connected platinum as electrode catalyst,
                      outstanding mass normalized currents were achieved resulting
                      in accelerated cell degradation. Clearly observable effects
                      on the electrodes were characterized ex situ by scanning
                      electron microscopy and the electrochemical activity
                      measured in operando by the decline of the current density
                      at a constant cell voltage. After electrochemical
                      measurement, changes of the electrodes were almost
                      exclusively limited to the cathode side, where the
                      electrolyte CsH2PO4 penetrated the previously distinct
                      platinum layer originating from the current collector
                      fibers. The observed morphological changes decreased the
                      number of electrocatalytically active sites by covering the
                      platinum layer or isolating the current collectors. These
                      effects correlate both with the duration of the measurement
                      and the current density. At different potentials, an
                      asymptotic behavior of the cell performance was observed,
                      identifying current-induced localized heating as the main
                      degradation mechanism. Due to the high overpotential at the
                      cathode, hotspots close to the current collectors could
                      reach sufficient temperatures during cell operation to
                      facilitate a morphological change of the electrolyte. This
                      work gives a detailed analysis of the degradation mechanism
                      in platinum-based solid acid fuel cell electrodes, providing
                      valuable information for designing stable high-performance
                      electrodes.},
      cin          = {IEK-14},
      ddc          = {660},
      cid          = {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:000573449300036},
      doi          = {10.1039/D0SE00842G},
      url          = {https://juser.fz-juelich.de/record/875401},
}