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@ARTICLE{Pappert:867916,
      author       = {Pappert, Kevin and Loza, Kateryna and Shviro, Meital and
                      Hagemann, Ulrich and Heggen, Marc and Dunin-Borkowski, Rafal
                      and Schierholz, Roland and Maeda, Takuya and Kaneko, Kenji
                      and Epple, Matthias},
      title        = {{N}anoscopic {P}orous {I}ridium/{I}ridium {D}ioxide
                      {S}uperstructures (15 nm): {S}ynthesis and {T}hermal
                      {C}onversion by {I}n {S}itu {T}ransmission {E}lectron
                      {M}icroscopy},
      journal      = {Chemistry - a European journal},
      volume       = {25},
      number       = {47},
      issn         = {1521-3765},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2019-06514},
      pages        = {11048 - 11057},
      year         = {2019},
      abstract     = {Porous particle superstructures of about 15 nm
                      diameter,consisting of ultrasmall nanoparticles of iridium
                      andiridium dioxide, are prepared through the reduction
                      ofsodium hexachloridoiridate(+IV) with sodium
                      citrate/sodiumborohydride in water. The water-dispersible
                      porous particlescontain about 20 $wt\%$
                      poly(N-vinylpyrrolidone) (PVP), whichwas added for colloidal
                      stabilization. High-resolution transmissionelectron
                      microscopy confirms the presence of bothiridium and iridium
                      dioxide primary particles (1–2 nm) ineach porous
                      superstructure. The internal porosity(58 $vol\%)$ is
                      demonstrated by electron tomography. In situtransmission
                      electron microscopy up to 1000 8C underoxygen, nitrogen,
                      argon/hydrogen (all at 1 bar), and vacuumshows that the
                      porous particles undergo sintering and subsequentcompaction
                      upon heating, a process that starts ataround 250 8C and is
                      completed at around 8008C. Finally,well-crystalline iridium
                      dioxide is obtained under all four environments.The
                      catalytic activity of the as-prepared poroussuperstructures
                      in electrochemical water splitting (oxygenevolution
                      reaction; OER) is reduced considerably upon heatingowing to
                      sintering of the pores and loss of internal surfacearea.},
      cin          = {ER-C-1 / IEK-9 / IEK-14},
      ddc          = {540},
      cid          = {I:(DE-Juel1)ER-C-1-20170209 / I:(DE-Juel1)IEK-9-20110218 /
                      I:(DE-Juel1)IEK-14-20191129},
      pnm          = {135 - Fuel Cells (POF3-135) / 131 - Electrochemical Storage
                      (POF3-131) / 134 - Electrolysis and Hydrogen (POF3-134) /
                      DFG project 257727131 - Nanoskalige Pt
                      Legierungselektrokatalysatoren mit definierter Morphologie:
                      Synthese, Electrochemische Analyse, und ex-situ/in-situ
                      Transmissionselektronenmikroskopische (TEM) Studien
                      (257727131) / 143 - Controlling Configuration-Based
                      Phenomena (POF3-143)},
      pid          = {G:(DE-HGF)POF3-135 / G:(DE-HGF)POF3-131 /
                      G:(DE-HGF)POF3-134 / G:(GEPRIS)257727131 /
                      G:(DE-HGF)POF3-143},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:31140211},
      UT           = {WOS:000479852000001},
      doi          = {10.1002/chem.201901623},
      url          = {https://juser.fz-juelich.de/record/867916},
}