authors |
Pikalova, E; Kolchugin, A; Zakharchuk, K; Boiba, D; Tsvinkinberg, V; Filonova, E; Khrustov, A; Yaremchenko, A |
nationality |
International |
journal |
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY |
author keywords |
Lanthanum nickelate; Oxygen nonstoichiometry; Ionic conductivity; Oxygen electrode; Polarization resistance; Solid oxide fuel cell |
keywords |
TRANSPORT-PROPERTIES; NICKEL(III) OXIDE; CATHODE MATERIALS; FUEL-CELLS; LN(2)NIO(4+DELTA) LN; MAGNETIC-PROPERTIES; CRYSTAL-STRUCTURE; COMPLEX OXIDES; LA; PEROVSKITE |
abstract |
Ruddlesden-Popper La2-xGdxNiO4+delta (x = 0-0.4) nickelates were synthesized by glycerolnitrate combustion technique and explored as potential oxygen electrode materials for solid oxide fuel/electrolysis cells. Similar to the parent La2NiO4+delta, the metastability of RP-type n = 1 structure limits the applicability of La2-xGdxNiO4+delta to temperatures below 900 degrees C. These solid solutions are mixed conductors with predominantly p-type electronic conductivity that exceeds 50 S/cm at 500-800 degrees C in air. Substitution by gadolinium does not change the overstoichiometric oxygen content in air but has a negative impact on the mobility of interstitial oxygen, most likely, due to steric effects associated with the lattice shrinkage on doping. The electrochemical activity of bilayer electrodes comprising functional La2-xGdxNiO4+delta and current collecting LaNi0.6Fe0.4O3-delta + 3 wt% CuO layers in contact with Ce0.8Gd0.2O1.9 electrolyte was studied in air at 550-850 degrees C. Analysis of electrochemical impedance spectroscopy data employing the ALS (Adler-Lane-Steele) model revealed the limiting role of oxygen-ionic conductivity of functional La2-xGdxNiO4+delta materials in overall electrode performance. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
issn |
0360-3199 |
isbn |
1879-3487 |
year published |
2021 |
volume |
46 |
issue |
32 |
beginning page |
16932 |
ending page |
16946 |
digital object identifier (doi) |
10.1016/j.ijhydene.2021.03.007 |
web of science category |
15 |
subject category |
Chemistry, Physical; Electrochemistry; Energy & Fuels |
unique article identifier |
WOS:000644993100012
|