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@ARTICLE{Wiegmann:475499,
      author       = {Wiegmann, Tim and Pacheco, Ivan and Reikowski, Finn and
                      Stettner, Jochim and Qiu, Canrong and Bouvier, Mathilde and
                      Bertram, Manon and Faisal, Firas and Brummel, Olaf and
                      Libuda, Jörg and Drnec, Jakub and Allongue, Philippe and
                      Maroun, Fouad and Magnussen, Olaf},
      title        = {{O}perando {I}dentification of the {R}eversible {S}kin
                      {L}ayer on {C}o$_3${O}$_4$ as a {T}hree-{D}imensional
                      {R}eaction {Z}one for {O}xygen {E}volution},
      journal      = {ACS catalysis},
      volume       = {12},
      issn         = {2155-5435},
      address      = {Washington, DC},
      publisher    = {ACS},
      reportid     = {PUBDB-2022-01347},
      pages        = {3256 - 3268},
      year         = {2022},
      abstract     = {Co oxides and oxyhydroxides have been studied extensively
                      in the past as promising electrocatalysts for the oxygen
                      evolution reaction (OER) in neutral to alkaline media.
                      Earlier studies showed the formation of an ultrathin
                      CoO$_x$(OH)$_y$ skin layer on Co$_3$O$_4$ at potentials
                      above 1.15 V vs reversible hydrogen electrode (RHE), but the
                      precise influence of this skin layer on the OER reactivity
                      is still under debate. We present here a systematic study of
                      epitaxial spinel-type Co$_3$O$_4$ films with defined (111)
                      orientation, prepared on different substrates by
                      electrodeposition or physical vapor deposition. The OER
                      overpotential of these samples may vary up to 120 mV,
                      corresponding to two orders of magnitude differences in
                      current density, which cannot be accounted for by
                      differences in the electrochemically active surface area. We
                      demonstrate by a careful analysis of operando surface X-ray
                      diffraction measurements that these differences are clearly
                      correlated with the average thickness of the skin layer. The
                      OER reactivity increases with the amount of formed skin
                      layer, indicating that the entire three-dimensional skin
                      layer is an OER-active interphase. Furthermore, a scaling
                      relationship between the reaction centers in the skin layer
                      and the OER activity is established. It suggests that two
                      lattice sites are involved in the OER mechanism.},
      cin          = {DOOR ; HAS-User / UKiel},
      ddc          = {540},
      cid          = {I:(DE-H253)HAS-User-20120731 / I:(DE-H253)UKiel-20120814},
      pnm          = {6G3 - PETRA III (DESY) (POF4-6G3)},
      pid          = {G:(DE-HGF)POF4-6G3},
      experiment   = {EXP:(DE-H253)P-P23-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000783841900001},
      pubmed       = {pmid:35359579},
      doi          = {10.1021/acscatal.1c05169},
      url          = {https://bib-pubdb1.desy.de/record/475499},
}