A new in situ methodology for the quantification of the oxygen storage potential in perovskite-type materials

Abstract

A well known perovskite-type material, LaFeO 3 , was prepared by citrate-nitrate auto-combustion synthesis and used to formulate a new in situ approach for the analytical evaluation of the redox properties of this class of material. Carbon monoxide was used as a reducing agent-probe, while molecular oxygen was used as an oxidizing agent-probe. In situ FTIR spectroscopy was applied for a qualitative characterization of the interaction probe-material, and microgravimetry was used in order to quantify the extent of the interaction. The results obtained indicated that simple molecules, such as CO and O 2 , are able to define the redox properties of the material without inducing any important modification as in the case of the more classical temperature-programmed reduction and oxidation methods. The described procedure can be successfully applied for the evaluation of the oxygen mobility/availability and storage potential of other perovskite-type materials.

Sucrose-Assisted Solution Combustion Synthesis of Doped Strontium Ferrate Perovskite-Type Electrocatalysts: Primary Role of the Secondary Fuel

“…It is supposed that the observed CO 2 evolution is due to the presence of oxygenated organic residues in the materials, probably derived from incomplete combustion of PEG. The same residues are probably responsible for the surface area decrement observed in this sample (Table S2), in agreement with the literature [64,65].…”

A new, sustainable LaFeO3 material prepared from biowaste-sourced soluble substances

“…Analogous results were evidenced for LaFeO 3 prepared by citric acid (Table 2), which were discussed in detail in a previous paper. 42 In that case, the effect was much less evident, in agreement with the different nature of the fuel.…”

Revisiting the catalytic activity of a doped SrFeO3 for water pollutants removal: Effect of light and temperature

“…According to previous studies regarding other mixed oxides prepared by SCS [15,27], the presence of unreacted organic precursors in the final material was expected. To confirm this hypothesis, the powder was washed with Milli-Q water for two hours under stirring and the washing water was analysed for TOC determination, revealing the presence of 0.84 mg L -1 of total organic carbon.…”