Recent progress in cryochemical synthesis of oxide materials

Shlyakhtin, O.A.; Tretyakov, Yuri D.

doi:10.1039/a805081c

Cited by 49 publications

(8 citation statements)

References 21 publications

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“…Such a passivation can be induced by silylation for instance with trimethylchlorosilane [ 31 ] or hexamethyldisiloxane [ 14 ]. A preparation method rests on ion exchange treatments prior to drying [ 45 , 46 ].…”

Section: Sol-gel Synthesismentioning

confidence: 99%

Influence of Chemical Conditions on the Nanoporous Structure of Silicate Aerogels

Sinkó

2010

Materials

137

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Silica or various silicate aerogels can be characterized by highly porous, open cell, low density structures. The synthesis parameters influence the three-dimensional porous structures by modifying the kinetics and mechanism of hydrolysis and condensation processes. Numerous investigations have shown that the structure of porous materials can be tailored by variations in synthesis conditions (e.g., the type of precursors, catalyst, and surfactants; the ratio of water/precursor; the concentrations; the medium pH; and the solvent). The objectives of this review are to summarize and elucidate the effects of chemical conditions on the nanoporous structure of sol-gel derived silicate aerogels.

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Section: Sol-gel Synthesismentioning

confidence: 99%

Influence of Chemical Conditions on the Nanoporous Structure of Silicate Aerogels

Sinkó

2010

Materials

137

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“…The pyrochlore materials were prepared using the spray-freeze freeze-drying approach following the procedure as previously described. [43][44][45] Precursor solutions, containing both transition metals (Ru and Ir) in the desired ratio and one rare earth metal (Nd, Gd, Yb), were prepared by dissolving the corresponding metal salts in Milli-Q quality deionized water. The total metal concentration was kept at 8 mM for each sample solution.…”

Section: Materials Preparationmentioning

confidence: 99%

Synergistic effects in oxygen evolution activity of mixed iridium-ruthenium pyrochlores

Pittkowski

Abbott²,

Nebel³

et al. 2021

Electrochimica Acta

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“…A simple combination of solution freezing with the following sublimation allows to retain a uniform salt distribution obtained in the starting solution and to prepare precursors mixed at the atomic level for the synthesis of complex oxide powders. This method has been successfully used for the complex oxide preparation (high-temperature superconductors, magnetic materials, electrode materials) for a long time [31,32]. Moreover, the freeze-drying method has been extensively utilized for the preparation of LiFePO 4 [33], LiMO 2 (M = Mn, Ni, Co) [34,35,36,37] and other cathode materials.…”

Section: Introductionmentioning

confidence: 99%

Cryochemically Processed Li1+yMn1.95Ni0.025Co0.025O4 (y = 0, 0.1) Cathode Materials for Li-Ion Batteries

et al. 2018

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A new route for the preparation of nickel and cobalt substituted spinel cathode materials (LiMn1.95Co0.025Ni0.025O4 and Li1.1Mn1.95Co0.025Ni0.025O4) by freeze-drying of acetate precursors followed by heat treatment was suggested in the present work. The experimental conditions for the preparation single-phase material with small particle size were optimized. Single-phase spinel was formed by low-temperature annealing at 700 °C. For discharge rate 0.2 C, the reversible capacities 109 and 112 mAh g−1 were obtained for LiMn1.95Co0.025Ni0.025O4 and Li1.1Mn1.95Co0.025Ni0.025O4, respectively. A good cycle performance and capacity retention about 90% after 30 cycles at discharge rate 0.2–4 C were observed for the materials cycled from 3 to 4.6 V vs. Li/Li+. Under the same conditions pure LiMn2O4 cathode materials represent a reversible capacity 94 mAh g−1 and a capacity retention about 80%. Two independent experimental techniques (cyclic voltammetry at different scan rates and electrochemical impedance spectroscopy) were used in order to investigate the diffusion kinetics of lithium. This study shows that the partial substitution of Mn in LiMn2O4 with small amounts of Ni and Co allows the cyclability and the performance of LiMn2O4-based cathode materials to be improved.

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Recent progress in cryochemical synthesis of oxide materials

Cited by 49 publications

References 21 publications

Influence of Chemical Conditions on the Nanoporous Structure of Silicate Aerogels

Influence of Chemical Conditions on the Nanoporous Structure of Silicate Aerogels

Synergistic effects in oxygen evolution activity of mixed iridium-ruthenium pyrochlores

Cryochemically Processed Li1+yMn1.95Ni0.025Co0.025O4 (y = 0, 0.1) Cathode Materials for Li-Ion Batteries

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