The effect of Fe on chemical stability and oxygen evolution performance of high surface area SrTix-1FexO3-δ mixed ionic-electronic conductors in alkaline media

Lankauf, Krystian; Mroziński, Aleksander; Błaszczak, Patryk; Górnicka, Karolina; Ignaczak, Justyna; Łapiński, Marcin; Karczewski, Jakub; Cempura, Grzegorz; Jasiński, Piotr; Molin, Sebastian

doi:10.1016/j.ijhydene.2021.06.088

Cited by 15 publications

(7 citation statements)

References 82 publications

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“…The PZ0 1200 sample has the maximum specific surface area (8.14 ± 0.02 m 2 g −1 ), which is reduced as the iron concentration increases. This behavior has already been observed in other studies and is related to a more intense sintering tendency in iron‐rich samples compared to undoped compositions 53,54 . The significant reduction of the surface area in the samples calcined at 1400°C is also due to the enhancement of the sintering process at higher temperatures.…”

Section: Resultssupporting

confidence: 83%

“…This behavior has already been observed in other studies and is related to a more intense sintering tendency in iron-rich samples compared to undoped compositions. 53,54 The significant reduction of the surface area in the samples calcined at 1400 • C is also due to the enhancement of the sintering process at higher temperatures. The average pore diameter found in all compositions did not show any significant variation, and the values are classified as nanopores according to the International Union of Pure and Applied Chemistry classification.…”

Section: Resultsmentioning

confidence: 99%

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The catalytic activity of the Pr₂Zr₂₋_xFe_xO_7±_δ system for the CO oxidation reaction

et al. 2022

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One of the alternatives to decrease the concentration of CO is its oxidation reaction to CO 2 , which can be made more efficient using catalysts. In this work, it is shown that pyrochlore structures are a promising candidate to act as heterogeneous catalysts due to their chemical and physical properties. For use as a catalyst in this reaction, the Pr 2 Zr 2−x Fe x O 7±δ (x = 0, 0.05, 0.10, and 0.15) system was synthesized by the solvothermal method, firing the powder obtained at temperatures of 1200 and 1400 • C. The diffraction patterns confirmed the pyrochlore structure as the single phase in all the nominal compositions. The Brunauer-Emmett-Teller method and dynamic light-scattering analysis showed an increase in the particle size and a decrease in the specific surface area when increasing the iron concentration and increasing the calcination temperature. The compositions that presented the best catalytic activity were the samples with the highest iron concentration. Moreover, these samples were able to convert all the CO oxidation reactions in a narrower temperature range than a conventional CeO 2 sample. The presence of vacancies and the redox behavior of the elements present are the key factors for the catalysis of this system in the CO oxidation reaction.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

The catalytic activity of the Pr₂Zr₂₋_xFe_xO_7±_δ system for the CO oxidation reaction

et al. 2022

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“…The relationships between B‐site disorder and Tafel slope (Figure 7C) and reaction selectivity (Figure 7D) for an extended range leads us to propose that B‐site distortions caused by Fe‐doping changes α by selectively distorting the coordination environments of reaction sites. Such changes in α are not yet fully understood in the literature, but they have been suggested to arise from distortions that alter the symmetry of the potential energy surface for layered double hydroxide electrocatalysts for the oxygen evolution reaction, [31–33] and to be controllable through lattice strain manipulation [18,34–36] . The ability to systematically tune the Tafel slope through non‐conventional values by simple compositional substitution identifies this family of materials, especially LaSrNi 1−y Fe y O 4+δ , as a candidate to establish a more robust understanding on the variation of the α parameter in heterogeneous electrocatalysis.…”

Section: Discussionmentioning

confidence: 99%

How Cation Substitutions Affect the Oxygen Reduction Reaction on La_2−xSr_xNi_1−yFe_yO₄

2022

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The atomic proximity of two disparate structural motifs in interleaved structures such as that adopted by La2NiO4, which alternates rock salt and perovskite motifs, offers potential synergistic effects and increased tunability for electrocatalyst behavior. Structural and voltammetric analysis of the intersecting composition series LaSrNi1−yFeyO4+δ and La2−xSrxNi0.7Fe0.3O4+δ show that tuning different cation sites uniquely affects structure and behavior. Correlations between X‐ray diffraction and Raman spectroscopy results reveal that structural changes in the a‐b plane are uniformly matched by the c‐axis following La−Sr exchange, while Ni−Fe exchange distorts the structure by expanding the crystal c‐axis and generating oxygen defects with a distinct signature in Raman spectra. Correlations between rotating ring‐disk electrode voltammetry results and structural parameters show that only Fe substitution has a direct effect on the electrocatalytic oxygen reduction reaction. We link systematic changes observed for onset of electrocatalytic oxygen reduction reaction, Tafel slope, and selectivity to distortions in the B‐site environments. This analysis demonstrates that correlational analysis linking electrochemical behavior parameters to multiple structural characterization techniques is an effective means to probe the effect of individual compositional substitution on electrocatalytic behavior.

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“…Furthermore, the broadening of the LSF50 diffraction peak for the KOH-oxidized sample indicates the decrement of crystallinity of the films. This is likely due to the foreseen creation of structural defects, as previously referred in the literature. , Regardless of this decrease of crystalline quality observed by XRD, the microstructural stability of the LSF50 films in 0.1 M KOH solution is proved by SEM analysis of the morphology of the layers after cycling (see Figure S6 in the Supporting Information), which remains crack-free and fully dense.…”

Section: Resultsmentioning

confidence: 55%

Ion Intercalation in Lanthanum Strontium Ferrite for Aqueous Electrochemical Energy Storage Devices

Tang

Chiabrera

Morata

et al. 2022

ACS Appl. Mater. Interfaces

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Ion intercalation of perovskite oxides in liquid electrolytes is a very promising method for controlling their functional properties while storing charge, which opens up its potential application in different energy and information technologies. Although the role of defect chemistry in oxygen intercalation in a gaseous environment is well established, the mechanism of ion intercalation in liquid electrolytes at room temperature is poorly understood. In this study, the defect chemistry during ion intercalation of La0.5Sr0.5FeO3−δ thin films in alkaline electrolytes is studied. Oxygen and proton intercalation into the La1–x Sr x FeO3−δ perovskite structure is observed at moderate electrochemical potentials (0.5 to –0.4 V), giving rise to a change in the oxidation state of Fe (as a charge compensation mechanism). The variation of the concentration of holes as a function of the intercalation potential is characterized by in situ ellipsometry, and the concentration of electron holes is indirectly quantified for different electrochemical potentials. Finally, a dilute defect chemistry model that describes the variation of defect species during ionic intercalation is developed.

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The effect of Fe on chemical stability and oxygen evolution performance of high surface area SrTix-1FexO3-δ mixed ionic-electronic conductors in alkaline media

Cited by 15 publications

References 82 publications

The catalytic activity of the Pr₂Zr₂₋_xFe_xO_7±_δ system for the CO oxidation reaction

The catalytic activity of the Pr₂Zr₂₋_xFe_xO_7±_δ system for the CO oxidation reaction

How Cation Substitutions Affect the Oxygen Reduction Reaction on La_2−xSr_xNi_1−yFe_yO₄

Ion Intercalation in Lanthanum Strontium Ferrite for Aqueous Electrochemical Energy Storage Devices

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The effect of Fe on chemical stability and oxygen evolution performance of high surface area SrTix-1FexO3-δ mixed ionic-electronic conductors in alkaline media

Cited by 15 publications

References 82 publications

The catalytic activity of the Pr2Zr2−xFexO7±δ system for the CO oxidation reaction

The catalytic activity of the Pr2Zr2−xFexO7±δ system for the CO oxidation reaction

How Cation Substitutions Affect the Oxygen Reduction Reaction on La2−xSrxNi1−yFeyO4

Ion Intercalation in Lanthanum Strontium Ferrite for Aqueous Electrochemical Energy Storage Devices

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The catalytic activity of the Pr₂Zr₂₋_xFe_xO_7±_δ system for the CO oxidation reaction

The catalytic activity of the Pr₂Zr₂₋_xFe_xO_7±_δ system for the CO oxidation reaction

How Cation Substitutions Affect the Oxygen Reduction Reaction on La_2−xSr_xNi_1−yFe_yO₄