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Electrochemical performance of La 0.8 Sr 0.2 MnO 3 oxygen electrode promoted by Ruddlesden‐Popper structured La 2 NiO 4
Author(s) -
Akbari Zohreh,
Babaei Alireza
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16804
Subject(s) - non blocking i/o , electrolysis , polarization (electrochemistry) , electrode , materials science , analytical chemistry (journal) , anode , dielectric spectroscopy , overpotential , electrochemistry , oxide , high temperature electrolysis , chemistry , metallurgy , electrolyte , biochemistry , chromatography , catalysis
Abstract The effects of introducing La 2 NiO 4 nanocatalyst on the electrochemical performance of La 0.8 Sr 0.2 MnO 3 are investigated under solid oxide electrolysis cell and fuel cell modes, as well as open circuit voltage. Extracted data from impedance spectroscopy are interpreted with the analysis of distribution of relaxation times. La 2 NiO 4 infiltration effectively reduces the activation energy of the oxygen reactions from 1.35 to 0.99 eV. It also changes the rate controlling process of the overall reaction. Polarization behavior of La 2 NiO 4 ‐infiltrated La 0.8 Sr 0.2 MnO 3 electrode shows superior performance under electrolysis mode compared to the fuel cell mode. Drastic increase in the size of low frequency arc during anodic current passage in the non‐infiltrated La 0.8 Sr 0.2 MnO 3 electrode is hampered by infiltration of La 2 NiO 4 nanocatalyst. By applying anodic current on infiltrated La 0.8 Sr 0.2 MnO 3 , no displacement is observed in the position of high frequency peaks in the distribution of relaxation time graphs and only a small increase in height occurs for the low frequency arc. Additionally, La 2 NiO 4 ‐infiltrated electrode impressively decreases overpotential by 74% compared to the non‐infiltrated one under electrolysis mode at 800°C.