Physiochemical properties of combustion synthesized La0.6Sr0.4Co0.8Fe0.2O3− perovskite: A role of fuel to oxidant ratio

Jamale, Atul P.; Shanmugam, Sangaraju; Bhosale, C.H.; Jadhav, L.D.

doi:10.1016/j.mssp.2015.07.091

Cited by 14 publications

(13 citation statements)

References 30 publications

(30 reference statements)

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“…As has been reported in other works, the agglomerates formed at lower G/N ratio are soft and could be easily split up, while those at the higher ratio are hard and difficult to break into particles [5].…”

Section: Morphological Studysupporting

confidence: 80%

“…Wet-chemical solution-combustion synthesis is an effective and economical approach [4]. The exothermicity of the reaction, which influences the powder characteristics such as crystallite size, surface area, phase purity and the nature of agglomeration, can be changed by varying the fuel to oxidant ratio and/or employing different fuels [5].…”

Section: Introductionmentioning

confidence: 99%

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Effect of the synthesis conditions on the properties of La0.15Sm0.35Sr0.08Ba0.42FeO3−δ cathode material for SOFCs

et al. 2017

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Abstract:The perovskite La 0.15 Sm 0.35 Sr 0.08 Ba 0.42 FeO 3-δ has been prepared by the glycine nitrate (GNC) route, varying the fuel/oxidizer ratio (glycine/nitrate, G/N= 1 and 2) and cooling rate (slow cooling and air-quenched), in order to study the influence of sample preparation on the materials' properties, in the context of their application as a cathode material for SOFCs. For this, the performance of the prepared mixed ion and electron conducting perovskite oxides is dictated by their structure, oxygen stoichiometry (3-δ), chemical composition and thermal expansion properties. High-resolution Synchrotron X-ray powder diffraction patterns were collected at room temperature and at 700 and 800ºC. It was found that the materials had a cubic crystal structure at these temperatures. As expected, 3-δ decreased as temperature increased, and was slightly smaller for the quenched sample. Higher electrical conductivity values were obtained for the sample with G/N = 1 (air-quenched) in the cooling rate. At 700 and 800°C the cathode synthesized with G/N = 1 and air-quenched showed the smallest polarization resistance values in impedance spectroscopy studies. Therefore, the physicochemical and electrochemical characterization clearly demonstrated the influence of the synthetic conditions on the cathode performance.

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Section: Morphological Studysupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Effect of the synthesis conditions on the properties of La0.15Sm0.35Sr0.08Ba0.42FeO3−δ cathode material for SOFCs

et al. 2017

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“…The vibration spectrum for Ag in this range gets flattened because of the presence of Ag in pure metallic form without any kind of oxygen bonding present in it or because of the possible sintering at higher temperature with increase in fuel ratio. 56,57 In Co spectrum, the two absorption peaks at 652 and 549 cm −1 originate from the stretching vibration of the Co−O bond where Co 2+ (3d 7 ) is tetrahedrally coordinated at 653 cm −1 and Co 3+ (3d 6 ) is octahedrally coordinated at 550 cm −1 confirming the presence of spinel Co 3 O 4 . 58,59 The peak at 1043 cm −1 corresponds to the characteristic vibration of surface bidentate carbonate from the gaseous CO 2 that interacts between the lattice oxygen present in spinel Co 3 O 4 .…”

Section: ■ Results and Discussionmentioning

confidence: 94%

Synthesis of Highly Efficient Bifunctional Ag/Co₃O₄Catalyst for Oxygen Reduction and Oxygen Evolution Reactions in Alkaline Medium

et al. 2018

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Ag/Co 3 O 4 catalysts using three different modes of solution combustion synthesis were developed and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy to identify crystallite size, oxidation state, composition, and morphology. Cyclic voltammetry and linear sweep voltammetry measurements for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) confirm the bifunctionality of the electrocatalysts. The electrochemical evaluation indicates that a synergic effect between Ag and Co enhances the activity through the fast breaking of O–O bond in the molecular oxygen to enhance the reduction mechanism. The high content of cobalt (Co) in the catalyst Ag/Co 3 O 4 -12, synthesized by second wave combustion, improves the activity for ORR, and the reaction mechanism follows a 3.9 number of electron transfer in overall reaction. The kinetic and limiting current densities of Ag/Co 3 O 4 -12 are maximum when compared to those of other Ag/Co 3 O 4 catalysts and are very close to commercial Pt/C. Moreover, the maximum current density of OER for Ag/Co 3 O 4 -12 makes it a promising candidate for various bifunctional electrocatalytic applications such as fuel cells and metal–air batteries.

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“…Disregarding the chemical composition considered, two generally accepted conclusions about the Φ effect on the powder properties are that (i) higher Φ values correspond to a more reducible environment during the synthesis, and (ii) the carbon content in the as-burned powders increases by increasing Φ [42,46]. However, the effect of Φ on the materials properties is still not clear, and different results have also been reported [48][49][50][51][52]. This apparent divergence is likely due to the different experimental conditions used and to the different chemical composition of the studied samples [39].…”

Section: Introductionmentioning

confidence: 99%

“…This apparent divergence is likely due to the different experimental conditions used and to the different chemical composition of the studied samples [39]. In fact, Φ is able to influence several features of the combustion process itself, like the combustion temperature and duration of the process, and the importance of each feature in the structural, microstructural, morphological and textural properties of the obtained materials depends both on chemical composition, type of fuel and type of technological application [39,47,52]. Furthermore, the effect of experimental conditions may affect differently the products depending on the fuel used.…”

Section: Introductionmentioning

confidence: 99%

Clarifying the Role of the Reducers-to-Oxidizers Ratio in the Solution Combustion Synthesis of Ba0.5Sr0.5Co0.8Fe0.2O3-δ Oxygen Electrocatalysts

et al. 2020

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Ba0.5Sr0.5Co0.8Fe0.2O3-δ perovskite-type compounds are well-known mixed ionic-electronic conductors for oxygen electrocatalytic applications, although their performance is strictly dependent on the selected preparation methodology and processing parameters. The reducers-to-oxidizers ratio (Φ) is a very important parameter in the solution combustion synthesis of mixed ionic-electronic conductors. Selection of Φ is not trivial and it strongly depends on the type of fuel used, the chemical composition and the specific application of the material. This work clarifies the role of Φ in the solution combustion synthesis of Ba0.5Sr0.5Co0.8Fe0.2O3-δ for application as oxygen electrocatalysts. Ba0.5Sr0.5Co0.8Fe0.2O3-δ powders were synthesized by solution combustion synthesis using sucrose-polyethylene glycol fuel mixtures with reducers-to-oxidizers ratio values between 1 (stoichiometric) and 3 (over-stoichiometric). Chemical-physical properties were studied by X-ray diffraction, scanning electron microscopy, N2 adsorption at −196 °C, H2-temperature programmed reduction and thermogravimetric analysis. The results evidenced the direct role of Φ on the intensity and redox environment of the combustion process, and its indirect influence on the Ba0.5Sr0.5Co0.8Fe0.2O3-δ electrode materials properties. Taking into account the general picture, the highly over-stoichiometric Φ was selected as the optimal one and the electrochemical activity of the corresponding powder was tested by electrochemical impedance spectroscopy on electrolyte-supported half-cells employing a Ce0.8Sm0.2O2-x electrolyte.

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Physiochemical properties of combustion synthesized La0.6Sr0.4Co0.8Fe0.2O3− perovskite: A role of fuel to oxidant ratio

Cited by 14 publications

References 30 publications

Effect of the synthesis conditions on the properties of La0.15Sm0.35Sr0.08Ba0.42FeO3−δ cathode material for SOFCs

Effect of the synthesis conditions on the properties of La0.15Sm0.35Sr0.08Ba0.42FeO3−δ cathode material for SOFCs

Synthesis of Highly Efficient Bifunctional Ag/Co₃O₄Catalyst for Oxygen Reduction and Oxygen Evolution Reactions in Alkaline Medium

Clarifying the Role of the Reducers-to-Oxidizers Ratio in the Solution Combustion Synthesis of Ba0.5Sr0.5Co0.8Fe0.2O3-δ Oxygen Electrocatalysts

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Physiochemical properties of combustion synthesized La0.6Sr0.4Co0.8Fe0.2O3− perovskite: A role of fuel to oxidant ratio

Cited by 14 publications

References 30 publications

Effect of the synthesis conditions on the properties of La0.15Sm0.35Sr0.08Ba0.42FeO3−δ cathode material for SOFCs

Effect of the synthesis conditions on the properties of La0.15Sm0.35Sr0.08Ba0.42FeO3−δ cathode material for SOFCs

Synthesis of Highly Efficient Bifunctional Ag/Co3O4Catalyst for Oxygen Reduction and Oxygen Evolution Reactions in Alkaline Medium

Clarifying the Role of the Reducers-to-Oxidizers Ratio in the Solution Combustion Synthesis of Ba0.5Sr0.5Co0.8Fe0.2O3-δ Oxygen Electrocatalysts

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Synthesis of Highly Efficient Bifunctional Ag/Co₃O₄Catalyst for Oxygen Reduction and Oxygen Evolution Reactions in Alkaline Medium