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Ion transport in solid-state devices is of great interest for current andfuture energy and information technologies. A superior enhancement of severalorders of magnitude of the oxygen diffusivity has been recently reported forgrain boundaries in lanthanum strontium manganites. However, the significanceand extent of this unique phenomenon is not yet established. Here, we fabricatea thin film continuous composition map of the La0.8Sr0.2(Mn1-xCox)0.85O3-dfamily revealing a substantial enhancement of the grain boundary oxygen masstransport properties for the entire range of compositions. Throughisotope-exchange depth profiling coupled to secondary ion mass spectroscopy, weshow that this excellent performance is not directly linked to the bulk of thematerial but to the intrinsic nature of the grain boundary. In particular, thegreat increase of the oxygen diffusion in Mn-rich compositions unveils anunprecedented catalytic performance in the field of Mixed Ionic ElectronicConductors. These results present grain boundaries engineering as a novelstrategy for designing highly performing materials for solid state ionics baseddevices.

chemistry of materials

Unveiling the outstanding oxygen mass transport properties of Mn-rich  perovskites in grain boundary-dominated La0.8Sr0.2(Mn1-xCox)0.85O3-d  nanostructures