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@ARTICLE{Weber:910082,
      author       = {Weber, Moritz L. and Lole, Gaurav and Kormanyos, Attila and
                      Schwiers, Alexander and Heymann, Lisa and Speck, Florian D.
                      and Meyer, Tobias and Dittmann, Regina and Cherevko, Serhiy
                      and Jooss, Christian and Baeumer, Christoph and Gunkel,
                      Felix},
      title        = {{A}tomistic {I}nsights into {A}ctivation and {D}egradation
                      of {L}a 0.6 {S}r 0.4 {C}o{O} 3−δ {E}lectrocatalysts under
                      {O}xygen {E}volution {C}onditions},
      journal      = {Journal of the American Chemical Society},
      volume       = {144},
      number       = {39},
      issn         = {0002-7863},
      address      = {Washington, DC},
      publisher    = {American Chemical Society},
      reportid     = {FZJ-2022-03601},
      pages        = {17966 - 17979},
      year         = {2022},
      abstract     = {The stability of perovskite oxide catalysts for the oxygen
                      evolution reaction (OER) plays a critical role in their
                      applicability in water splitting concepts. Decomposition of
                      perovskite oxides under applied potential is typically
                      linked to cation leaching and amorphization of the material.
                      However, structural changes and phase transformations at the
                      catalyst surface were also shown to govern the activity of
                      several perovskite electrocatalysts under applied potential.
                      Hence, it is crucial for the rational design of durable
                      perovskite catalysts to understand the interplay between the
                      formation of active surface phases and stability limitations
                      under OER conditions. In the present study, we reveal a
                      surface-dominated activation and deactivation mechanism of
                      the prominent electrocatalyst La0.6Sr0.4CoO3−δ under
                      steady-state OER conditions. Using a multiscale microscopy
                      and spectroscopy approach, we identify the evolving
                      Co-oxyhydroxide as catalytically active surface species and
                      La-hydroxide as inactive species involved in the transient
                      degradation behavior of the catalyst. While the leaching of
                      Sr results in the formation of mixed surface phases, which
                      can be considered as a part of the active surface, the
                      gradual depletion of Co from a self-assembled active CoO(OH)
                      phase and the relative enrichment of passivating La(OH)3 at
                      the electrode surface result in the failure of the
                      perovskite catalyst under applied potential.},
      cin          = {PGI-7 / JARA-FIT / IEK-1 / IEK-11},
      ddc          = {540},
      cid          = {I:(DE-Juel1)PGI-7-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)IEK-1-20101013 / I:(DE-Juel1)IEK-11-20140314},
      pnm          = {5233 - Memristive Materials and Devices (POF4-523)},
      pid          = {G:(DE-HGF)POF4-5233},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {36130265},
      UT           = {WOS:000859957100001},
      doi          = {10.1021/jacs.2c07226},
      url          = {https://juser.fz-juelich.de/record/910082},
}