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@ARTICLE{Park:894107,
      author       = {Park, Seongeun and Shviro, Meital and Hartmann, Heinrich
                      and Besmehn, Astrid and Mayer, Joachim and Stolten, Detlef
                      and Carmo, Marcelo},
      title        = {{N}ickel {S}tructures as a {T}emplate {S}trategy to
                      {C}reate {S}haped {I}ridium {E}lectrocatalysts for
                      {E}lectrochemical {W}ater {S}plitting},
      journal      = {ACS applied materials $\&$ interfaces},
      volume       = {13},
      number       = {11},
      issn         = {1944-8252},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2021-03042},
      pages        = {13576 - 13585},
      year         = {2021},
      abstract     = {Low-cost, highly active, and highly stable catalysts are
                      desired for the generation of hydrogen and oxygen using
                      water electrolyzers. To enhance the kinetics of the oxygen
                      evolution reaction in an acidic medium, it is of paramount
                      importance to redesign iridium electrocatalysts into novel
                      structures with organized morphology and high surface area.
                      Here, we report on the designing of a well-defined and
                      highly active hollow nanoframe based on iridium. The
                      synthesis strategy was to control the shape of nickel
                      nanostructures on which iridium nanoparticles will grow.
                      After the growth of iridium on the surface, the next step
                      was to etch the nickel core to form the NiIr hollow
                      nanoframe. The etching procedure was found to be significant
                      in controlling the hydroxide species on the iridium surface
                      and by that affecting the performance. The catalytic
                      performance of the NiIr hollow nanoframe was studied for
                      oxygen evolution reaction and shows 29 times increased
                      iridium mass activity compared to commercially available
                      iridium-based catalysts. Our study provides novel insights
                      to control the fabrication of iridium-shaped catalysts using
                      3d transition metal as a template and via a facile etching
                      step to steer the formation of hydroxide species on the
                      surface. These findings shall aid the community to finally
                      create stable iridium alloys for polymer electrolyte
                      membrane water electrolyzers, and the strategy is also
                      useful for many other electrochemical devices such as
                      batteries, fuel cells, sensors, and solar organic cells.},
      cin          = {IEK-14 / IEK-3 / ZEA-3 / ER-C-2},
      ddc          = {600},
      cid          = {I:(DE-Juel1)IEK-14-20191129 / I:(DE-Juel1)IEK-3-20101013 /
                      I:(DE-Juel1)ZEA-3-20090406 / I:(DE-Juel1)ER-C-2-20170209},
      pnm          = {1231 - Electrochemistry for Hydrogen (POF4-123) / 1111 -
                      Effective System Transformation Pathways (POF4-111) / 1112 -
                      Societally Feasible Transformation Pathways (POF4-111)},
      pid          = {G:(DE-HGF)POF4-1231 / G:(DE-HGF)POF4-1111 /
                      G:(DE-HGF)POF4-1112},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {33706507},
      UT           = {WOS:000634759500097},
      doi          = {10.1021/acsami.0c23026},
      url          = {https://juser.fz-juelich.de/record/894107},
}