In situ XRD and TGA/DTA study of multiphase La- and Nd-substituted Pr2NiO4 under IT-SOFC cathode operating conditions

Mishchenko, D.D.; Arapova, Marina; Bespalko, Yulia; Винокуров, З. С.; Shmakov, A. N.

doi:10.1016/j.jallcom.2023.171693

Cited by 7 publications

(2 citation statements)

References 53 publications

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“…General requirements for such materials are chemical and thermomechanical stability under a high gradient of the oxygen chemical potential, high oxygen or mixed ionic-electronic conductivity and surface reactivity, high selectivity in the partial oxidation of fuels into syngas, and relatively low cost. The common deactivation mechanisms include [247] thermal degradation (phase segregation under high temperature and/or under oxygenrich/deficient atmosphere) [248][249][250]; inactive phase formation or poisoning (either due to the chemical reaction between component layers for SOFC or due to the interaction with the gas phase for catalytic reactors) [242,251]; and mechanical cracking (which is often the case for layered SOFCs during thermal cycling of components with different thermal expansion coefficients (TECs)) [252,253]. Popov et al [249] constructed a reactor for in situ XRD studies of oxygen-permeable membranes compatible with a conventional D8 Advance (Bruker) powder diffractometer.…”

Section: Study Of the Process Of The Deactivation Of Catalystsmentioning

confidence: 99%

In Situ X-ray Diffraction as a Basic Tool to Study Oxide and Metal Oxide Catalysts

Bulavchenko,

Vinokurov

2023

Catalysts

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X-ray diffraction (XRD) is a standard technique that is widely applied in heterogeneous catalysis to determine phase composition, atomic structure, and size of crystallites. This review is focused on the application of in situ XRD for studying the catalysts during their “lifetime” (under synthesis, activation, operation, and deactivation conditions), limiting the objects of research to oxide and metal oxide catalysts. Also included is a brief overview of modern techniques and instruments and the latest works illustrating different aspects of this technique in catalyst research. The main conclusion is that the field of heterogeneous catalysis research would benefit substantially from the application of in situ XRD for the structural, phase, and morphological characterization of solid catalysts. Even more useful information can be obtained if XRD is combined with other techniques that are more sensitive at length scales different from that of XRD.

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Section: Study Of the Process Of The Deactivation Of Catalystsmentioning

confidence: 99%

In Situ X-ray Diffraction as a Basic Tool to Study Oxide and Metal Oxide Catalysts

Bulavchenko,

Vinokurov

2023

Catalysts

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“…Tracing the development history of cathode systems, perovskite-type materials occupy the dominant position [14][15][16][17][18][19][20]. In the classic perovskite system (ABO 3 ), A-site oxygen ions appear in a twelve-coordinate arrangement, while B-site ions have a six-coordinate arrangement.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Cathode Performance in Pr0.5Sr0.5FeO3−δ of Perovskite Catalytic Materials via Doping with VB Subgroup Elements (V, Nb, and Ta)

Chen,

Lü,

2024

Materials

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Perovskite-style materials are cathode systems known for their stability in solid oxide fuel cells (SOFCs). Pr0.5Sr0.5FeO3−δ (PSF) exhibits excellent electrode performance in perovskite cathode systems at high temperatures. Via VB subgroup metals (V, Nb, and Ta) modifying the B-site, the oxidation and spin states of iron elements can be adjusted, thereby ultimately adjusting the cathode’s physicochemical properties. Theoretical predictions indicate that PSF has poor stability, but the relative arrangement of the three elements on the B-site can significantly improve this material’s properties. The modification of Nb has a large effect on the stability of PSF cathode materials, reaching a level of −2.746 eV. The surface structure of PSF becomes slightly more stable with an increase in the percentage of oxygen vacancy structures, but the structural instability persists. Furthermore, the differential charge density distribution and adsorption state density of the three modified cathode materials validate our adsorption energy prediction results. The initial and final states of the VB subgroup metal-doped PSF indicate that PSFN is more likely to complete the cathode surface adsorption reaction. Interestingly, XRD and EDX characterization are performed on the synthesized pure and Nb-doped PSF material, which show the orthorhombic crystal system of the composite theoretical model structure and subsequent experimental components. Although PSF exhibits strong catalytic activity, it is highly prone to decomposition and instability at high temperatures. Furthermore, PSFN, with the introduction of Nb, shows greater stability and can maintain its activity for the ORR. EIS testing clearly indicates that Nb most significantly improves the cathode. The consistency between the theoretical predictions and experimental validations indicates that Nb-doped PSF is a stable and highly active cathode electrode material with excellent catalytic activity.

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Tailoring the defect structure and functional properties of Pr2NiO4+δ via partial Pr-substitution with lanthanum and neodymium

Tarutin,

Tarutina,

Filonova

2024

Ceramics International

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In situ XRD and TGA/DTA study of multiphase La- and Nd-substituted Pr2NiO4 under IT-SOFC cathode operating conditions

Cited by 7 publications

References 53 publications

In Situ X-ray Diffraction as a Basic Tool to Study Oxide and Metal Oxide Catalysts

In Situ X-ray Diffraction as a Basic Tool to Study Oxide and Metal Oxide Catalysts

Enhanced Cathode Performance in Pr0.5Sr0.5FeO3−δ of Perovskite Catalytic Materials via Doping with VB Subgroup Elements (V, Nb, and Ta)

Tailoring the defect structure and functional properties of Pr2NiO4+δ via partial Pr-substitution with lanthanum and neodymium

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