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Keywords:

  • electrochemistry;
  • epitaxy;
  • fuel cells;
  • heterogeneous catalysis;
  • perovskite phases
Thumbnail image of graphical abstract

The active ingredient: La0.8Sr0.2CoO3−δ (LSC) epitaxial thin films are prepared on (001)-oriented yttria-stabilized zirconia (YSZ) single crystals with a gadolinium-doped ceria (GDC) buffer layer (see picture). The LSC epitaxial films exhibit better oxygen reduction kinetics than bulk LSC. The enhanced activity is attributed in part to higher oxygen nonstoichiometry.