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@ARTICLE{Hua:885716,
      author       = {Hua, Fan and Folke, Jan Markus and Liu, Zigeng and
                      Girgsdies, Frank and Imlau, Robert and Ruland, Holger and
                      Heumann, Saskia and Granwehr, Josef and Eichel, Rüdiger-A.
                      and Schlögl, Robert and Huang, Xing and Frei, Elias},
      title        = {{U}ltrathin 2{D} {F}e-{N}anosheets {S}tabilized by 2{D}
                      {M}esoporous {S}ilica: {S}ynthesis and {A}pplication in
                      {A}mmonia {S}ynthesis},
      journal      = {ACS applied materials $\&$ interfaces},
      volume       = {13},
      number       = {25},
      issn         = {1944-8252},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2020-04028},
      pages        = {30187 - 30197},
      year         = {2021},
      abstract     = {Developing high-performance Fe-based ammonia catalysts
                      through simple and cost-efficient methods has received an
                      increased level of attention. Herein, we report for the
                      first time, the synthesis of two-dimensional (2D) FeOOH
                      nanoflakes encapsulated by mesoporous SiO2 (mSiO2) via a
                      simple solution-based method for ammonia synthesis. Due to
                      the sticking of the mSiO2 coating layers and the limited
                      spaces in between, the Fe after reduction retains the 2D
                      morphology, showing high resistance against the sintering in
                      the harsh Haber–Bosch process. Compared to supported Fe
                      particles dispersed on mSiO2 spheres, the coated catalyst
                      shows a significantly improved catalytic activity by $50\%$
                      at 425 °C. Thermal desorption spectroscopy (TDS) reveals
                      the existence of a higher density of reactive sites for N2
                      activation in the 2D Fe catalyst, which is possibly coupled
                      to a larger density of surface defect sites (kinks, steps,
                      point defects) that are generally considered as active
                      centers in ammonia synthesis. Besides the structural impact
                      of the coating on the 2D Fe, the electronic one is
                      elucidated by partially substituting Si with Al in the
                      coating, confirmed by 29Si and 27Al magic-angle spinning
                      nuclear magnetic resonance (MAS NMR). An increased apparent
                      activation energy (Ea) of the Al-containing catalyst
                      evidences an influence on the nature of the active site. The
                      herein-developed stable 2D Fe nanostructures can serve as an
                      example of a 2D material applied in catalysis, offering the
                      chance of a rational catalyst design based on a stepwise
                      introduction of various promoters, in the coating and on the
                      metal, maintaining the spatial control of the active
                      centers.},
      cin          = {IEK-9},
      ddc          = {600},
      cid          = {I:(DE-Juel1)IEK-9-20110218},
      pnm          = {1223 - Batteries in Application (POF4-122)},
      pid          = {G:(DE-HGF)POF4-1223},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {34129331},
      UT           = {WOS:000670430100091},
      doi          = {10.1021/acsami.1c06771},
      url          = {https://juser.fz-juelich.de/record/885716},
}