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@ARTICLE{Weber:862397,
      author       = {Weber, Moritz L. and Baeumer, Christoph and Mueller, David
                      N. and Jin, Lei and Jia, Chun-Lin and Bick, Daniel S. and
                      Waser, R. and Dittmann, Regina and Valov, Ilia and Gunkel,
                      Felix},
      title        = {{E}lectrolysis of {W}ater at {A}tomically {T}ailored
                      {E}pitaxial {C}obaltite {S}urfaces},
      journal      = {Chemistry of materials},
      volume       = {31},
      number       = {7},
      issn         = {1520-5002},
      address      = {Washington, DC},
      publisher    = {American Chemical Society},
      reportid     = {FZJ-2019-02725},
      pages        = {2337 - 2346},
      year         = {2019},
      abstract     = {As complex transition-metal oxides of perovskite
                      structures, many cobaltites are active electrocatalysts
                      promoting oxygen evolution reaction (OER) during
                      electrochemical water splitting. To unveil specific
                      structure–activity relationships for electrocatalytic
                      performance, innovative types of catalysts are required to
                      overcome the inherent high complexity of regular powder
                      catalysts, where thin-film technology gained significance in
                      recent years. As we demonstrate, epitaxial La0.6Sr0.4CoO3
                      (LSCO) thin films can be deposited with controlled bulk
                      properties, surface structure, and stoichiometry on
                      orthorhombic (110) NdGaO3 single-crystalline substrates by
                      pulsed-laser deposition, providing ideal model systems for
                      this purpose. The epitaxial thin films are dense and single
                      crystalline with sub-nanometer surface roughness and grow
                      well oriented toward the pseudocubic [001] direction. The
                      LSCO thin films show high activity catalyzing the OER and
                      can carry significant current density loads exceeding 100
                      mA/cm2. Using these model catalysts, X-ray photoemission
                      spectroscopy reveals the degradation of the material under
                      these dynamic conditions, involving cation leaching and a
                      phase transformation of the oxide. An altered surface
                      stoichiometry as well as cobalt hydroxide formation is
                      observed. Our results show that epitaxial model systems can
                      be operated at large current density loads, allowing a
                      systematic study of catalysts and their degradation under
                      highly dynamic conditions.},
      cin          = {PGI-7 / JARA-FIT / PGI-6 / ER-C-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)PGI-7-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)PGI-6-20110106 / I:(DE-Juel1)ER-C-1-20170209},
      pnm          = {524 - Controlling Collective States (POF3-524)},
      pid          = {G:(DE-HGF)POF3-524},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000464477100016},
      doi          = {10.1021/acs.chemmater.8b04577},
      url          = {https://juser.fz-juelich.de/record/862397},
}