Nickel Exsolution‐Driven Phase Transformation from an n=2 to an n=1 Ruddlesden‐Popper Manganite for Methane Steam Reforming Reaction in SOFC Conditions

Vecino-Mantilla, Sebastian; Gauthier‐Maradei, Paola; Huvé, Marielle; Serra, José M.; Roussel, Pascal; Gauthier, Gilles H.

doi:10.1002/cctc.201901002

Cited by 32 publications

(49 citation statements)

References 95 publications

(202 reference statements)

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“…It is worth noting that nickel is deposited as hemispherical Ni particles in only specific zones of the surface, suggesting that, using the impregnation method, the active phase is not uniformly distributed on the support, as has been reported in the literature . Such results differ from those obtained in the case of exsolution, for which the surface is covered with anchored (strong particle‐oxide matrix interaction) small and uniformly distributed Ni nanoparticles (less than 40 nm) . These differences will be key factors that probably influence the materials' performance, activity, selectivity, and stability with respect to steam reforming.…”

Section: Resultsmentioning

confidence: 91%

“…Consequently, the particle migration cannot be the dominant mechanism due to the strong nanoparticle‐matrix oxide interaction with practically null sintering by crystallite migration . However, as explained previously, the particle coarsening does not completely disappear, as another mechanism may take place known as atomic migration or Ostwald ripening process. Such mechanism is slower than the particle migration and describes the growth of a larger particle by consuming a smaller one without direct connection; clusters of atoms from a small particle migrate through the oxide surface and merge into another large particle to reach the equilibrium.…”

Section: Resultsmentioning

confidence: 93%

“…The average Ni particle size (

{\overline{D}}_{p}

) was determined at different reduction conditions (T and t r ) using the scanning electron micrographs (SEM), based on about 100 particles in four selected T‐t r conditions to obtain characteristic frequency histograms. The grouped particle size data were analyzed using as likelihood fitting method a lognormal distribution as already described previously for exsolved material; the selected distributions are shown in Figure S3. In the impregnated LSMO n=1 material, reduced at 850 °C during 4 h, the calculated

{\overline{D}}_{p}

value is 38.20±2.43 nm, similar to the value obtained for an 8 h treatment (

{\overline{D}}_{p}

=38.68±2.13 nm); the material nanostructure seems not to be significative affected by the reduction treatment duration.…”

Section: Resultsmentioning

confidence: 99%

“…The manganite powders were synthesized by the Pechini or citrate complexation route . In the case of La 1.5 Sr 1.5 Mn 1.5 Ni 0.5 O 7±δ (hereafter referred to as LSMN n=2), the procedure is described in previous works . For La 0.5 Sr 1.5 MnO 4±δ (LSMO n=1), stoichiometric amounts of La 2 O 3 (≥99.9 % Alfa Aesar), SrCO 3 (≥99.9 % Sigma Aldrich) and MnCO 3 (≥99.9 % Sigma Aldrich) were used.…”

Section: Methodsmentioning

confidence: 99%

“…Considering that CH 4 is the most abundant hydrocarbon in Cusiana gas, Colombia, (Table ), these tests were carried out using only a dry mixture of 82 mol% CH 4 (N 2 as balance) humidified to a steam to carbon ratio (S/C) of 0.15 for different reactor inlet flow rates. It is worth noting that prior to this test, the catalyst sample was in situ reduced using 55 mL (STP) min −1 of 3 mol% H 2 /N 2 mixture (Cryogas) during 4 h at T=850 °C, as defined previously …”

Section: Methodsmentioning

confidence: 99%

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Catalytic Steam Reforming of Natural Gas over a New Ni Exsolved Ruddlesden‐Popper Manganite in SOFC Anode Conditions

et al. 2020

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The catalytic behavior of the new Ni exsolved Ruddlesden‐Popper (RP) manganite (La1.5Sr1.5Mn1.5Ni0.5O7) for the reforming reaction was studied. The material was synthesized by the Pechini method and reduced to induce the formation of two phases: n=1 RP structure LaSrMnO4 decorated with Ni nanoparticles. Ni impregnation on (La,Sr)2MnO4 ceramic support of similar composition was also prepared for comparison. The catalytic measurements were carried out in a reduction‐reaction process with low steam to carbon content (S/C=0.15) at 700, 800 and 850 °C. The exsolved material exhibits a better performance than the impregnated for the methane steam reforming reaction, especially at 850 °C with higher conversion and H2 production rate. However, in light alkane gas mixtures (CH4−C2H6 and CH4−C3H8), the behavior is affected due to the competition between reactions and low available metallic active sites, without affecting the H2 production. The exceptional overall results considering this new material as a promising anode material in a SOFC fed with Colombian natural gas.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 93%

“…The average Ni particle size (

{\overline{D}}_{p}

{\overline{D}}_{p}

value is 38.20±2.43 nm, similar to the value obtained for an 8 h treatment (

{\overline{D}}_{p}

=38.68±2.13 nm); the material nanostructure seems not to be significative affected by the reduction treatment duration.…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Catalytic Steam Reforming of Natural Gas over a New Ni Exsolved Ruddlesden‐Popper Manganite in SOFC Anode Conditions

et al. 2020

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Recent Advances in Perovskite Oxides Electrocatalysts: Ordered Perovskites, Cations Segregation and Exsolution

GAO

et al. 2023

ChemCatChem

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Perovskite oxides have been widely confirmed as a promising alternative to precious metals as catalysts for a wide range of environmental protection, energy storage, and conversion devices for their prominent intrinsic electrocatalytic activity, flexible structure, low cost, and easy synthesis. Since its discovery in 1839, perovskite oxide has been the subject of a considerable amount of systematic research in several exploring aspects (e. g., materials synthesis, component regulation, and catalytic properties). The above‐mentioned findings have been extensively reviewed and consolidated in numerous publications. The heterogeneous catalytic performance of perovskite oxides has been significantly affected by their surface composition, electronic structure, and defect chemistry. This study places a focus on the crystal structure and structure regulation of ordered perovskite oxides. Moreover, the recent research progress in areas (e. g., perovskite surface element segregation, law of exsolution, and the mechanism of exsolution) is systematically reviewed. Furthermore, this study highlights potential future directions for the development of perovskite oxides.

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Pr and Mo Co‐Doped SrFeO_3–δ as an Efficient Cathode for Pure CO₂ Reduction Reaction in a Solid Oxide Electrolysis Cell

Zhang

Zhao

et al. 2020

Energy Tech

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Carbon dioxide (CO 2) electrolysis via a solid oxide electrolysis cell (SOEC), simplified as CO 2 RR, is a significantly promising energy conversion technology, which can effectively convert greenhouse gas CO 2 to value-added chemical agent carbon monoxide (CO) by using renewable electricity with high efficiency. [1] A SOEC is usually consisted of an ion conducting electrolyte, an anode for O 2 generation, and a cathode for CO 2 electroreduction. [1a,1b] To make the technology available for commercial application, it is necessary to simultaneously enhance the electrocatalytic activity and stability of the cathode during the operation. The state-of-the-art Ni-based cathodes exhibit excellent electrochemical performance, [2] but suffer from performance degradation due to the aggregation and oxidation of Ni particles as well as carbon deposition at the elevated temperature. [3] Therefore, it is highly in need to develop alternative cathode materials with high electrocatalytic activity and good long-term stability for CO 2 RR application. In recent years, mixed ionic-electronic conducting (MIEC) perovskite oxides, such as strontium titanate (SrTiO 3)-based oxides and lanthanum chromate (LaCrO 3)-based oxides, have been explored as the potential cathode materials because these cathode materials have demonstrated excellent stability at the elevated temperature for directly electrolyzing CO 2 to CO without the addition of any safe gas (usually H 2 , CO, or H 2-CO mixture). [4] However, their performance is still insufficient for practical CO 2 RR application. Therefore, further modification still needs to be done to efficiently enhance the cathode performance to enable direct CO 2 electrolysis. It is well known that CO 2 is difficult to be directly reduced to CO because of its extremely high energy barrier for directly breaking C═O bond (%1.9 eV), and sufficient CO 2 adsorption and activation is an important prerequisite for direct CO 2 electroreduction via a SOEC. [5] Previous studies have revealed that the introduction of oxygen vacancies at the cathode surface could not only effectively accelerate the CO 2 chemical adsorption, but also significantly reduce the energy barrier of CO 2 dissociation, possibly facilitating the direct CO 2 RR. [6] Metallic nanoparticles have been commonly introduced into the perovskite oxide cathodes to effectively alter the electrocatalytic properties of the cathodes, and to significantly increase the concentration of oxygen vacancies, resulting in a remarkable improvement of CO 2 adsorption and activation. [4d,5b,7] Therefore, it is highly expected to construct metallic nanoparticles-decorated perovskite oxide cathodes for efficient CO 2 RR. Recently, metallic nanoparticles-structured perovskite oxide cathodes have been effectively generated in one step by the in situ exsolution method. [8] It is demonstrated that these in situ exsolved metallic nanoparticles can strongly facilitate CO 2 adsorption and C═O bond activation, reasonably

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Nickel Exsolution‐Driven Phase Transformation from an n=2 to an n=1 Ruddlesden‐Popper Manganite for Methane Steam Reforming Reaction in SOFC Conditions

Cited by 32 publications

References 95 publications

Catalytic Steam Reforming of Natural Gas over a New Ni Exsolved Ruddlesden‐Popper Manganite in SOFC Anode Conditions

Catalytic Steam Reforming of Natural Gas over a New Ni Exsolved Ruddlesden‐Popper Manganite in SOFC Anode Conditions

Recent Advances in Perovskite Oxides Electrocatalysts: Ordered Perovskites, Cations Segregation and Exsolution

Pr and Mo Co‐Doped SrFeO_3–δ as an Efficient Cathode for Pure CO₂ Reduction Reaction in a Solid Oxide Electrolysis Cell

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Nickel Exsolution‐Driven Phase Transformation from an n=2 to an n=1 Ruddlesden‐Popper Manganite for Methane Steam Reforming Reaction in SOFC Conditions

Cited by 32 publications

References 95 publications

Catalytic Steam Reforming of Natural Gas over a New Ni Exsolved Ruddlesden‐Popper Manganite in SOFC Anode Conditions

Catalytic Steam Reforming of Natural Gas over a New Ni Exsolved Ruddlesden‐Popper Manganite in SOFC Anode Conditions

Recent Advances in Perovskite Oxides Electrocatalysts: Ordered Perovskites, Cations Segregation and Exsolution

Pr and Mo Co‐Doped SrFeO3–δ as an Efficient Cathode for Pure CO2 Reduction Reaction in a Solid Oxide Electrolysis Cell

Contact Info

Product

Resources

About

Pr and Mo Co‐Doped SrFeO_3–δ as an Efficient Cathode for Pure CO₂ Reduction Reaction in a Solid Oxide Electrolysis Cell