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@ARTICLE{Bhm:903986,
      author       = {Böhm, Daniel and Beetz, Michael and Gebauer, Christian and
                      Bernt, Maximilian and Schröter, Jonas and Kornherr,
                      Matthias and Zoller, Florian and Bein, Thomas and
                      Fattakhova-Rohlfing, Dina},
      title        = {{H}ighly conductive titania supported iridium oxide
                      nanoparticles with low overall iridium density as {OER}
                      catalyst for large-scale {PEM} electrolysis},
      journal      = {Applied materials today},
      volume       = {24},
      issn         = {2352-9407},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2021-05556},
      pages        = {101134 -},
      year         = {2021},
      abstract     = {To enable future large-scale generation of hydrogen via
                      proton exchange membrane (PEM) electrolysis, utilization of
                      scarce iridium-based catalysts required for the oxygen
                      evolution reaction (OER) has to be significantly lowered. To
                      address this question, the facile synthesis of a highly
                      active TiO2 supported iridium oxide based OER catalyst with
                      reduced noble metal content and an Ir-density of the
                      catalyst powder as low as 0.05–0.08 gIr cm-3 is described
                      in this work. A high surface area corrosion-resistant
                      titania catalyst support homogeneously coated with a 1-2 nm
                      thin layer of amorphous IrOOHx is oxidized in molten NaNO3
                      between 350-375°C. This procedure allows for a controllable
                      phase transformation and crystallization to form a layer of
                      interconnected IrO2 nanoparticles of ≈2 nm on the surface
                      of the TiO2 support. The increase in crystallinity is
                      thereby accompanied by a significant increase in
                      conductivity of up to 11 S cm-1 for a 30 $wt\%$ Ir loaded
                      catalyst. Oxidized samples further display a significantly
                      increased stability with less detectable Ir dissolution
                      under OER conditions. With a mass-based activity of 59 A g-1
                      at an overpotential of 300 mV, the electrocatalytic activity
                      is maintained at the level of the highly active amorphous
                      IrOOHx phase used as precursor and outperforms it at higher
                      current densities through the increased conductivity. MEA
                      measurements with catalyst loadings of 0.2-0.3 mg cm-2
                      further confirm the high catalytic activity and initial
                      stability at industrially relevant current densities. The
                      introduced synthesis approach therefore shows a path for the
                      fabrication of novel highly active and atom-efficient oxide
                      supported catalysts with complex nanostructures and thin
                      homogenous nanoparticle coatings that allows a future
                      large-scale application of PEM electrolysis technology
                      without restrictions by the natural abundance of iridium.},
      cin          = {IEK-1},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {1231 - Electrochemistry for Hydrogen (POF4-123)},
      pid          = {G:(DE-HGF)POF4-1231},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000697464800001},
      doi          = {10.1016/j.apmt.2021.101134},
      url          = {https://juser.fz-juelich.de/record/903986},
}