Journal article
Electrochemical stability of (La,Sr)CoO3-δ in (La,Sr)CoO3-δ/(Ce, Gd)O2-δ heterostructures
University of Málaga1
Functional Oxides, Department of Energy Conversion and Storage, Technical University of Denmark2
Department of Energy Conversion and Storage, Technical University of Denmark3
Imaging and Structural Analysis, Department of Energy Conversion and Storage, Technical University of Denmark4
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 behavior with dominant electronic contributions, fast conductivity and mixed ionic-electronic properties, depending on the number of interfaces and the nano-scaled layers.
Language: | English |
---|---|
Year: | 2019 |
Pages: | 2916-2924 |
ISSN: | 20403372 and 20403364 |
Types: | Journal article |
DOI: | 10.1039/C8NR08528E |
ORCIDs: | Norby, Poul , Pryds, Nini , Esposito, Vincenzo , 0000-0002-1377-8351 , 0000-0002-3361-2340 and 0000-0003-0632-6442 |