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Issue 6, 2019
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Electrochemical stability of (La,Sr)CoO3−δ in (La,Sr)CoO3−δ/(Ce, Gd)O2−δ heterostructures

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A modulated coherent (La,Sr)CoO3−δ/(Ce,Gd)O2−δ heterostructure is characterized for the first time for its electronic and chemical properties. 2D-multilayer architectures are deposited on NdGaO3 (110) single crystal substrate by pulsed laser deposition, resulting in epitaxial structures with in-plane lattice rotation that, via the metal oxides’ interfaces, induces mutual structural rearrangements. Our results show that (La,Sr)CoO3−d thin films of 10–100 nm are chemically unstable when exposed to air at 600 °C during electrical cyclic stress-tests. Conversely, improved stability is achieved confining LSC in the nanometric heterostructure. Remarkably, the chemical stabilization occurs without compromising substantially the electrical properties of the LSC component: the heterostructures show unexpected electrical behaviour with dominant electronic contributions, fast conductivity and mixed ionic-electronic properties, depending on the number of interfaces and the nano-scaled layers.

Graphical abstract: Electrochemical stability of (La,Sr)CoO3−δ in (La,Sr)CoO3−δ/(Ce, Gd)O2−δ heterostructures

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The article was received on 22 Oct 2018, accepted on 21 Jan 2019 and first published on 22 Jan 2019

Article type: Paper
DOI: 10.1039/C8NR08528E
Citation: Nanoscale, 2019,11, 2916-2924

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    Electrochemical stability of (La,Sr)CoO3−δ in (La,Sr)CoO3−δ/(Ce, Gd)O2−δ heterostructures

    L. dos Santos-Gómez, S. Sanna, P. Norby, N. Pryds, E. R. Losilla, D. Marrero-López and V. Esposito, Nanoscale, 2019, 11, 2916
    DOI: 10.1039/C8NR08528E

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