Solid-State Gelation for Nanostructured Perovskite Oxide Aerogels

Cai, Bin; Akkiraju, Karthik; Mounfield, William P.; Wang, Zhenshu; Li, Xing; Huang, Botao; Yuan, Shuai; Su, Dong; Román‐Leshkov, Yuriy; Shao‐Horn, Yang

doi:10.1021/acs.chemmater.9b03182

Cited by 21 publications

(16 citation statements)

References 49 publications

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“…3 The low surface area bottleneck has been recently overcome by using nanoparticles as reagents during sol-gel-based syntheses, yielding high mass-normalized activity. 19 Designing manganese perovskites nanomaterials with small particle size but also high crystallinity should further enhance stability during electrocatalysis, but this level of materials design could not been reached through sol-gel-based processes.…”

Section: And Layered Perovskitementioning

confidence: 99%

Structure–Activity Relationship in Manganese Perovskite Oxide Nanocrystals from Molten Salts for Efficient Oxygen Reduction Reaction Electrocatalysis

et al. 2020

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We report a synthesis pathway in molten salts toward ligand-free nanoparticles of the layered perovskite La 0.5 Sr 1.5 MnO 4 (l-LSMO) and of the pseudo-cubic perovskite La 0.7 Sr 0.3 MnO 3 (pc-LSMO). These particles are readily implemented as oxygen reduction reaction (ORR) electrocatalysts in alkaline conditions. They show high ORR selectivity for the 4-electrons reduction of O2 in water. Among these two materials, pc-LSMO nanocrystals of 20 nm diameter exhibit high mass-normalized ORR activity for a perovskite material (21.4 A g-1 oxide at 0.8 V/RHE) thanks to their relatively large surface area, high crystallinity and electron mobility. These features provide pc-LSMO nanocrystals with remarkable stability compared to state-of-the-art perovskites, for instance only a 5% increase of the overpotential at-0.05 mA cm-2 oxide over 40 hours. pc-LSMO nanocrystals are then the most stable perovskite ORR electrocatalyst reported up to now. These performances, combined with high activity, high selectivity and absence of precious metals, make La 0.7 Sr 0.3 MnO 3 nanocrystals one of the best compromises for alkaline oxygen reduction reaction.

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Section: And Layered Perovskitementioning

confidence: 99%

Structure–Activity Relationship in Manganese Perovskite Oxide Nanocrystals from Molten Salts for Efficient Oxygen Reduction Reaction Electrocatalysis

et al. 2020

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“…This method was also proposed for the fabrication of different perovskites. For example, LaMnO 3±δ was prepared by thermal treatment of the LaMnOx/C precursors [41]. The solid-state gelation synthesis route was extended to a wide range of interesting perovskite oxides, including LaMnO 3 , LaFeO 3 , LaNiO 3 , LaCoO 3 , La 0.5 Sr 0.5 CoO 3 , and La 0.5 Sr 0.5 Co 0.5 Fe 0.5 O 3 .…”

Section: The Molecular and Macromolecular Complex Decomposition Methodsmentioning

confidence: 99%

Solid-State Preparation of Metal and Metal Oxides Nanostructures and Their Application in Environmental Remediation

Dı́az

Valenzuela

Laguna‐Bercero

2022

IJMS

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Nanomaterials have attracted much attention over the last decades due to their very different properties compared to those of bulk equivalents, such as a large surface-to-volume ratio, the size-dependent optical, physical, and magnetic properties. A number of solution fabrication methods have been developed for the synthesis of metal and metal oxides nanoparticles, but few solid-state methods have been reported. The application of nanostructured materials to electronic solid-state devices or to high-temperature technology requires, however, adequate solid-state methods for obtaining nanostructured materials. In this review, we discuss some of the main current methods of obtaining nanomaterials in solid state, and also we summarize the obtaining of nanomaterials using a new general method in solid state. This new solid-state method to prepare metals and metallic oxides nanostructures start with the preparation of the macromolecular complexes chitosan·Xn and PS-co-4-PVP·MXn as precursors (X = anion accompanying the cationic metal, n = is the subscript, which indicates the number of anions in the formula of the metal salt and PS-co-4-PVP = poly(styrene-co-4-vinylpyridine)). Then, the solid-state pyrolysis under air and at 800 °C affords nanoparticles of M°, MxOy depending on the nature of the metal. Metallic nanoparticles are obtained for noble metals such as Au, while the respective metal oxide is obtained for transition, representative, and lanthanide metals. Size and morphology depend on the nature of the polymer as well as on the spacing of the metals within the polymeric chain. Noticeably in the case of TiO2, anatase or rutile phases can be tuned by the nature of the Ti salts coordinated in the macromolecular polymer. A mechanism for the formation of nanoparticles is outlined on the basis of TG/DSC data. Some applications such as photocatalytic degradation of methylene by different metal oxides obtained by the presented solid-state method are also described. A brief review of the main solid-state methods to prepare nanoparticles is also outlined in the introduction. Some challenges to further development of these materials and methods are finally discussed.

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“…The first is a solid phase route that can be used to prepare perovskite oxide aerogels by solid-state gelation using carbon as the support. 65 This method was first proposed in 2019. The second is the gas phase route with only a few reported examples, such as CNT aerogels by CVD [66][67][68] or atomic layer deposition, 69 and BN aerogels by template-assisted CVD.…”

Section: Traditional Preparation Processes Of Aerogelsmentioning

confidence: 99%