Carbon dioxide gas sensing properties of ordered oxygen deficient perovskite LnBaCo2O5+ (Ln = La, Eu)

Gómez, L.; Galeano, V.; Parra, Rodrigo; Michel, Carlos R.; Paucar, Carlos; Morán, O.

doi:10.1016/j.snb.2015.07.080

Cited by 25 publications

(11 citation statements)

References 37 publications

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“…In addition to the well-established ones mentioned above, new potential applications regularly emerge for RBaCo 2 O 6−δ and their derivatives, obtained by substituting either A- or B-sublattice cations or both. Such applications include, but are not limited to, photoelectrochemical water splitting catalysis, thermochemical oxygen storage, CO 2 sensors, photocatalysis, and solar-driven vapor generation …”

Section: Introductionmentioning

confidence: 99%

“…47 In addition to the well-established ones mentioned above, new potential applications regularly emerge for RBaCo 2 O 6−δ and their derivatives, obtained by substituting either A-or Bsublattice cations or both. Such applications include, but are not limited to, photoelectrochemical water splitting catalysis, 48 thermochemical oxygen storage, 49 CO 2 sensors, 50 photocatalysis, 51 and solar-driven vapor generation. 52 In light of the mentioned vast and not yet completely realized potential of RBaCo 2 O 6−δ , our study is directed at filling some of the existing gaps in the reported physicochemical properties of RBaCo 2 O 6−δ (R = Sm or Eu), important from both pure and applied points of view.…”

Section: Introductionmentioning

confidence: 99%

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Redox Thermochemistry, Thermodynamics, and Solar Energy Conversion and Storage Capability of Some Double Perovskite Cobaltites

et al. 2021

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The oxygen nonstoichiometry, δ, and oxidation enthalpy, ΔH ox , of double perovskites RBaCo 2 O 6−δ (R = Sm or Eu) were simultaneously measured depending on the temperature and oxygen partial pressure, p O 2 . Theoretical equations for ΔH ox (T, δ) and p O 2 (T, δ) were derived from the defect structure model based on the oxygen exchange and cobalt disproportionation reactions. These equations were fitted independently to each of the experimental ΔH ox (T, δ) and p O 2 (T, δ) data sets. The resulting enthalpies of defect reactions were found to be almost the same irrespective of the calculation method. In other words, the models, describing satisfactorily the data, can be used to calculate both compositional dependences and redox thermodynamics of RBaCo 2 O 6−δ (R = Sm or Eu). In addition, from the previously published data and the data presented here, trends were determined in the defect reaction thermodynamics of RBaCo 2 O 6−δ (R = La, Pr, Nd, Sm, Eu, Gd, or Y). Drop calorimetric measurements were performed in air to obtain enthalpy increments for RBaCo 2 O 6−δ (R = Sm or Eu) with variable oxygen content because the samples lost oxygen upon being heated in the calorimetric cell. As-obtained data were used to calculate the functional dependences of enthalpy increments of EuBaCo 2 O 5.56 and SmBaCo 2 O 5.6 with a constant oxygen content. In addition, as an example of practical application-oriented calculations for solar energy conversion and oxygen storage, the performances at equilibrium of RBaCo 2 O 6−δ (R = Pr, Sm, Eu, or Gd) were evaluated and compared to those of SrFeO 3−δ as a reference material.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Redox Thermochemistry, Thermodynamics, and Solar Energy Conversion and Storage Capability of Some Double Perovskite Cobaltites

et al. 2021

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“…Indeed, they exhibit a mixed ionic and electronic conductivity [2]. Besides, these ceramics are promising materials for a wide range of technological applications [3][4][5][6][7]. Moreover, ferroelectrics oxides are gaining much popularity in recent years in view of their high colossal dielectric constant (ε' 10 3 ) [8].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the electrical transport, conductivity, and dielectric relaxation behavior of La0.75 Ba0.10 Sr0.15 Fe O2.875-δ (δ = 0.375 and 0.50) brownmillerite oxides

Bouzayen

Dhahri

Saadi

et al. 2021

J Mater Sci: Mater Electron

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The topotactic reduction of La 0.75 Ba 0.10 Sr 0.15 FeO 2.875 with titanium metal leads to a new isostructural material of the composition La 0.75 Ba 0.10 Sr 0.15 FeO 2.875−δ (δ = 0.375 and 0.50). XRD analysis of phases con rms that the obtained compound adopts a brownmillerite-type structure. A slight distorted monoclinic P2/m was found to describe the crystal structure. The transport properties have been investigated by current-voltage (I-V). The electric and dielectric measurements were carried out covering a wide range of temperature (300-600 K). Our materials display semiconducting properties as well as mixed ionic and electronic conductivity. At high temperatures, the activation energy values proved to be around 907 − 630 meV, which refers basically to oxygen vacancies conduction. The analysis of dielectric properties and dielectric losses (ε', tanδ) of both compounds vs temperature at different frequencies demonstrates two relaxer attitudes. A low dielectric loss and low electrical conductance were displayed.Relying upon these values, these materials stand for perfect candidates for micro-electronics devices.

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“…Many oxygen-deficient perovskite oxides exhibit mixed ionic-electronic conductivity. 23 Mixed conducting materials are important in different areas, such as gas sensing devices, 79 electrodes for solid-oxide fuel cells 80 , and electrocatalysts. 81 Oxygen deficient perovskites have general formula ABO3-δ, where δ represents the oxygen deficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Oxygen deficient perovskites (ODPs) are an important component of solid oxide fuel cells. 163 They have also been studied for application as gas sensors, 161 gas diffusion membranes, 162 and photocatalysts. 216 Given the structure-property relationship in ODPs,…”

Section: Introductionmentioning

confidence: 99%

Oxygen deficient perovskites: effect of structure on electrical conductivity, magnetism and electrocatalytic activity.

Hona¹

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Oxygen evolution reaction …………………………………………....19 CHAPTER 2. TRANSFORMATION OF STRUCTURE, ELECTRICAL CONDUCTIVITY AND MAGNETISM IN AA'Fe2O6-δ, A=Sr, Ca and A'= Sr..…... 21 Introduction ………………………………………………………………….. 21 Experimental ……... …………………………………………………………. 23 Results and discussion ………………………………………………………. 25 Crystal structure ……………………………………………………... 25 Magnetic structure …………………………………………………… 33 Electrical Properties ………………………………………………..… 36 Conclusion ………………………………………………………………...…. 43 CHAPTER 3. UNRAVELING THE ROLE OF STRUCTURAL ORDER IN TRANSFORMATION OF ELECTRICAL CONDUCTIVITY IN Ca2FeCoO6-δ, CaSrFeCoO6-δ and Sr2FeCoO6-δ …………………………………………………..….. 44 ix Introduction ………………………………………………………………...…. 44 Experimental ………………………………………………………………..…. 46 Results and discussion …………………………………….…………………. 48 Crystal structure ………………………………………….…………… 48 X-ray photoelectron spectroscopy …………………………………… 61 Electrical conductivities ……………………………………...………. 65 Conclusion …………………………………………………………………….. 73 CHAPTER 4. MAGNETIC STRIUCTURE OF CaSrFeCoO5 ………………..……… 75 Introduction …………………………………………………………….……….75 Experimental section ……………………………………………….………….. 77 Results and discussion ………………………………………………………….……. 78 Conclusion ……………………………………………………………….…………… 86 CHAPTER 5. ELECTRICAL PROPERTIES OF ORDERED OXYGEN-DEFICIENT PEROVSKITE Ca2Fe0.5Ga1.5O5…………..…..……………………………………….. 87 Introduction …………………………………………….……………………. 87 Materials and methods ………………………………….……………………. 90 Results and discussion ……………………………………...……….…………91 Crystal structure …………………………………………….….……… 91 x Electrical properties ………………………………..………….……… 94 Conclusion ……………………………………………..…………..…………. 99 CHAPTER 6. ENHANCED ELECTRICAL PROPERTIES OIN BaSrFe2O6-δ (δ=0.5): A DISORDERED DEFECT-PEROVSKITE………………………..………………..…. 100 Introduction …………………………………………………….…………… 100 Experimental……… ………………………………………..……………….. 102 Results and discussion …………………………………………..…………… 103 Crystal structure …………………………………………………...…. 103 Magnetic properties ………………………………………...…………109 Electrical properties ………………………………………………….. 111 Conclusion ……………………………………………….………………….. 115 CHAPTER 7. CHARGE-TRANSPORT PROPERTIES OF Ca2FeGaO6-δ AND CaSrFeGaO6-δ: THE EFFECT OF DIFECT-ORDERED .……………………...…….. 117 Introduction ………………………………………………………………….. 117 Experimental …………………………………………….………………….. 120 Results and discussion ………………………………..……………………… 121 Crystal structure ……………………………………………….…….. 121 Microstructure and X-ray photoelectron spectroscopy studies…………125 Electrical properties ………………………………….………………. 127 Conclusion ………………………………………………………..…………. 133 xi CHAPTER 8. DISPARITY IN ELECTRICAL AND MAGNETIC PROPERTIES OF ISOSTRUCTURAL OXYGEN-DEFICIENT PEROVSKITES BaSrCo2O6-δ AND BaSrCoFeO6-δ ………..………….……………………………………………..…….. 134 Introduction ……………………………………………………….…………. 134 Experimental……… …………………………………….….………………… Results and discussion …………………………………….……...………….. Crystal structure and crystallite morphology …….………….………… X-ray photoelectron spectroscopy (XPS) and iodometric titration ….…141 Magnetic properties ……………………………………………....…… Electrical conductiviti...

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Carbon dioxide gas sensing properties of ordered oxygen deficient perovskite LnBaCo2O5+ (Ln = La, Eu)

Cited by 25 publications

References 37 publications

Redox Thermochemistry, Thermodynamics, and Solar Energy Conversion and Storage Capability of Some Double Perovskite Cobaltites

Redox Thermochemistry, Thermodynamics, and Solar Energy Conversion and Storage Capability of Some Double Perovskite Cobaltites

Analysis of the electrical transport, conductivity, and dielectric relaxation behavior of La0.75 Ba0.10 Sr0.15 Fe O2.875-δ (δ = 0.375 and 0.50) brownmillerite oxides

Oxygen deficient perovskites: effect of structure on electrical conductivity, magnetism and electrocatalytic activity.

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