TY - JOUR
T1 - Electrochemical stability of (La,Sr)CoO3-δ in (La,Sr)CoO3-δ/(Ce, Gd)O2-δ heterostructures
AU - Dos Santos Gómez, Lucia
AU - Sanna, Simone
AU - Norby, Poul
AU - Pryds, Nini
AU - Losilla, Enrique R.
AU - Marrero-López, David
AU - Esposito, Vincenzo
PY - 2019
Y1 - 2019
N2 - 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.
AB - 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.
U2 - 10.1039/C8NR08528E
DO - 10.1039/C8NR08528E
M3 - Journal article
SN - 2040-3364
VL - 11
SP - 2916
EP - 2924
JO - Nanoscale
JF - Nanoscale
IS - 6
ER -