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@ARTICLE{Qiu:615658,
      author       = {Qiu, Canrong and Maroun, Fouad and Bouvier, Mathilde and
                      Pacheco, Ivan and Allongue, Philippe and Wiegmann, Tim and
                      Scharf, Carl Hendric and de Manuel-Gonzalez, Victor and
                      Reikowski, Finn and Stettner, Jochim and Magnussen, Olaf M.},
      title        = {{O}perando {S}urface {X}‐ray {D}iffraction {S}tudies of
                      {E}pitaxial ${C}o_3{O}_4$ and ${C}o{OOH}$ {T}hin {F}ilms
                      during {O}xygen {E}volution: p{H} {D}ependence},
      journal      = {ChemCatChem},
      volume       = {16},
      number       = {23},
      issn         = {1867-3880},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {PUBDB-2024-06234},
      pages        = {e202400988},
      year         = {2024},
      abstract     = {Transition metal oxides, especially cobalt oxides and
                      hydroxides, are of great interest as precious metal free
                      electrode materials for the oxygen evolution reaction (OER)
                      in electrochemical and photoelectrochemical water splitting.
                      Here, we present detailed studies of the potential- and
                      pH-dependent structure and structural stability of Co3O4 and
                      CoOOH in neutral to alkaline electrolytes (pH 7 to 13),
                      using operando surface X-ray diffraction, atomic force
                      microscopy, and electrochemical measurements. The
                      experiments cover the pre-OER and OER range and were
                      performed on epitaxial Co3O4(111) and CoOOH(001) films
                      electrodeposited on Au(111) single crystal electrodes. The
                      CoOOH films were structurally perfectly stable under all
                      experimental conditions, whereas Co3O4 films exhibit at all
                      pH values reversible potential-dependent structural
                      transformations of a sub-nanometer thick skin layer region
                      at the oxide surface, as reported previously for pH 13 (F.
                      Reikowski et al., ACS Catal. 2019, 9, 3811). The intrinsic
                      OER activity at 1.65 V versus the reversible hydrogen
                      electrode decreases strongly with decreasing pH, indicating
                      a reaction order of 0.2 with respect to [OH−]. While the
                      Co3O4 spinel is stable at pH 13, intermittent exposure to
                      electrolytes with pH≤10 results in dissolution as well as
                      gradual degradation of its OER activity in subsequent
                      measurements at pH 13.},
      cin          = {DOOR ; HAS-User},
      ddc          = {540},
      cid          = {I:(DE-H253)HAS-User-20120731},
      pnm          = {6G3 - PETRA III (DESY) (POF4-6G3) / DFG project
                      G:(GEPRIS)284207613 - Elektrochemische Eigenschaften
                      epitaktischer Metalloxidkatalysatoren (284207613) / DFG
                      project G:(GEPRIS)388390466 - TRR 247: Heterogene
                      Oxidationskatalyse in der Flüssigphase – Materialien und
                      Mechanismen in der thermischen, Elektro- und Photokatalyse
                      (388390466) / FS-Proposal: I-20180014 (I-20180014) /
                      FS-Proposal: I-20180835 EC (I-20180835-EC)},
      pid          = {G:(DE-HGF)POF4-6G3 / G:(GEPRIS)284207613 /
                      G:(GEPRIS)388390466 / G:(DE-H253)I-20180014 /
                      G:(DE-H253)I-20180835-EC},
      experiment   = {EXP:(DE-H253)P-P23-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001341810200001},
      doi          = {10.1002/cctc.202400988},
      url          = {https://bib-pubdb1.desy.de/record/615658},
}