Chemical diffusion and oxygen exchange of LaNi0.4Fe0.6O3−δ ceramics

Abstract

p range. The oxygen exchange coefficients determined in reduction mode are higher than those determined in oxidation mode. This is explained by clusterization of oxygen vacancies on the surface of the sample investigated in oxidation mode. The opposite tendency is found for chemical diffusion coefficients. Unlike surface, the oxygen vacancies of the volume region are probably not clustered and have predetermined the higher oxygen diffusion mobility of the sample treated in oxidation mode.

Synergistic Effect of Calcium Oxide/LaNi0.5Fe0.5O3 Oxygen Carriers on Syngas Production from Algae Chemical Looping Gasification

“…For reoxidation OCs, all corresponding peaks of perovskite still exist without impurity, indicating that all oxygen carriers have recovered the perovskite phase. Almost all perovskite-structure oxygen carriers still exhibit the perovskite structure not only after reoxidation but also after reduction, implying that perovskite-type oxygen carriers have high crystal structure stability and excellent regeneration property Figure displays the SEM images of reoxidation oxygen carrier samples.…”

“…Almost all perovskite-structure oxygen carriers still exhibit the perovskite structure not only after reoxidation but also after reduction, implying that perovskite-type oxygen carriers have high crystal structure stability and excellent regeneration property. 37 Figure 9 displays the SEM images of reoxidation oxygen carrier samples. The morphological changes in LaNi 0.5 Fe 0.5 O 3 and CaO/La-Ni 0.5 Fe 0.5 O 3 can be observed.…”

Design of Mixed Ionic-Electronic Materials for Permselective Membranes and Solid Oxide Fuel Cells Based on Their Oxygen and Hydrogen Mobility

“…However, they can be successfully used in the composite electrodes in combination with different ionic conductors [ 249 , 250 , 251 ]. Lanthanum ferrite-nickelates (LNF), being predominantly electronic conductors, demonstrate low oxygen diffusion and, as a result, oxygen permeation properties [ 252 , 253 , 254 , 255 ]. Nevertheless, LaNi 0.6 Fe 0.4 O 3 , as the most stable in the series, found widespread application in SOCs due to its superior conductivity, low thermal expansion coefficient value, and tolerance to chromium poisoning [ 256 ].…”

Hydrogen‐rich syngas production from chemical looping steam reforming of bio‐oil model compound: Effect of bimetal on LaNi 0.8 M 0.2 O 3 (M = Fe, Co, Cu, and Mn)

“…53 The doping of Fe in LN can change oxygen site because of different binding energies. 54 The higher Fe-O bonding energy comparing with the Ni-O one can result in additional oxygen transportation along of -Ni-O-Fe-Oand -Fe-O-Fe-Ochains, which display well oxygen release performance. 55 The loose surface lattice oxygen generates vacancies, and it can enhance catalysis.…”