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@INPROCEEDINGS{Tileli:827177,
      author       = {Tileli, Vasiliki and Ahmad, Ehsan and Webster, Ross and
                      Mallia, Giuseppe and Duchamp, Martial and Stoerzinger,
                      Kelsey and Shao-Horn, Yang and Dunin-Borkowski, Rafal and
                      Harrison, Nicholas},
      title        = {2016{D}ecoupling of valence and coordination number
                      contributions at perovskite surfaces},
      address      = {Weinheim, Germany},
      publisher    = {Wiley-VCH Verlag GmbH $\&$ Co. KGaA},
      reportid     = {FZJ-2017-01375},
      pages        = {934- 935},
      year         = {2016},
      comment      = {European Microscopy Congress 2016: Proceedings},
      booktitle     = {European Microscopy Congress 2016:
                       Proceedings},
      abstract     = {Perovskite oxide nanostructures are on the forefront of
                      technology due to the wide spectrum of possible applications
                      pertinent to renewable energy sources, such as
                      water-splitting, solar cells, fuel cells, batteries, and
                      catalysis. In particular, the exceptional properties for the
                      oxygen reduction reaction in catalysis have been detailed
                      recently in a volcano plot and the results reveal that
                      orthorhombic, Jahn-Teller distorted LaMnO3 perovskite
                      nanoparticles are the leading, non-noble metal candidate for
                      enhanced catalytic activity on the cathode electrode of fuel
                      cells [1]. Since the functional properties of these
                      nanoparticles lie on their active surfaces, our approach
                      involves a detailed structural and chemical evaluation of
                      the surfaces on the atomic scale to determine what/where the
                      reaction centres are. Subsequently, the morphology of the
                      particles can be optimised to maximise the number of these
                      reaction centres, allowing us to attain the highest possible
                      performance of perovskite catalysts.From structural
                      transmission electron microscopy (TEM) data it was
                      determined that polar facets exist on crystallites, which
                      lead to assumptions on possible surface
                      reconstruction/relaxation. However, high resolution TEM
                      indicated that the atomic terminations of several surfaces
                      remained defect-free up to the very surface with no visible
                      reconstruction taking place [2], as shown in Figure 1. Next,
                      the surface and subsurface of the working perovskite
                      catalyst was probed by high spatial and temporal resolution
                      electron energy-loss spectroscopy (EELS) in scanning TEM
                      mode. The results revealed that the surface shows different
                      character than the bulk. Tan et al. has previously shown
                      that different oxidation states of Mn can be probed at
                      neighbouring sites in the same compound [3] but it was also
                      theoretically predicted that such a change can be attributed
                      to coordination number differences as well [4]. Indeed, the
                      extracted experimental information by EELS for the pristine
                      LaMnO3 powder was analysed utilising density functional
                      theory calculations under the optic matrix elements
                      approximation, as shown for the Mn L3 peak in Figure 2, and
                      the shift to lower energies of the Mn L3,2 edge was found to
                      be a convolution of both changes in oxidation state and in
                      the number of nearest neighbours (coordination).},
      month         = {Aug},
      date          = {2016-08-28},
      organization  = {16th European Microscopy Congress (EMC
                       2016), Lyon (France), 28 Aug 2016 - 2
                       Sep 2016},
      cin          = {PGI-5 / ER-C-1},
      cid          = {I:(DE-Juel1)PGI-5-20110106 / I:(DE-Juel1)ER-C-1-20170209},
      pnm          = {143 - Controlling Configuration-Based Phenomena (POF3-143)},
      pid          = {G:(DE-HGF)POF3-143},
      typ          = {PUB:(DE-HGF)8 / PUB:(DE-HGF)7},
      doi          = {10.1002/9783527808465.EMC2016.6949},
      url          = {https://juser.fz-juelich.de/record/827177},
}