Amorphous carbon nanotube mediated low-temperature synthesis of orange emitting self-assembled europium oxy-carbonate microflower

Low-Temperature Synthesized Pt3Fe Alloy Nanoparticles on Etched Carbon Nanotubes Catalyst Support Using Oxygen-Deficient Fe2O3 as a Catalytic Center for PEMFC Applications

“…24, and 20 mV dec −1 , respectively confirming the fastest kinetics of Pt 3 Fe-ECNT-1 for ORR (see FigureS10in the Supporting Information).…”

“…Suitable catalyst supports help in the uniform dispersion of these catalyst nanoparticles and mitigates the detachment of these Pt catalysts due to Ostwald ripening, thus improving the stability. One-dimensional (1D) carbon nanotubes (CNT) are used as potential catalyst support for PEMFC due to their excellent chemical, electrochemical and thermal stability, good electrical conductivity, and appreciable surface area (SA) − Furthermore, unzipping of the one-dimensional (1D) nanostructure usually results in abundant edges and defects, which also change charge transfer properties . Defect-induced carbon supports can provide higher anchoring sites for catalyst nanoparticles than pristine ones .…”

New Insights in the Hydrothermal Synthesis of Rare-Earth Carbonates

“…On one hand they are potential materials for specialized industrial applications such as the lighting industry, catalysis, and as a matrix for luminescence materials etc. [3,4], and on the other hand, they can be used as a template or as sacrificial materials for the synthesis of other nanocrystalline rare earth phases, especially oxides [1] but also oxysulfides [5]. A further field of research concerning lanthanides carbonates focuses on the complex formation among Ln 3+ and carbonate ions and is aiming to develop a model for chemical migration of actinide ions in the natural aquifers near a nuclear waste repository [6].…”

“…A further field of research concerning lanthanides carbonates focuses on the complex formation among Ln 3+ and carbonate ions and is aiming to develop a model for chemical migration of actinide ions in the natural aquifers near a nuclear waste repository [6]. Thus, several studies in the last few years have reported findings concerning the rare-earth carbonates; for example, Vallina et al [3,7] studied Dy, La, and Nd carbonate crystallization from amorphous products, and Ganguly et al [4] synthesized micro flower structures of europium hydroxycarbonate by homogeneous precipitation. Furthermore, amorphous doped and codoped cerium hydroxycarbonates with nanosized spherical morphology, which proved to be excellent precursors of ceramic electrolytes in Intermediate Temperature Solid Oxide Fuel Cells (IT-SOFC), were synthesized by controlled coprecipitation using ammonium carbonate as the precipitating agent [8,9,10,11].…”

“…Therefore, continuing these studies, in the present work we aimed to analyze the hydrothermal synthesis of other rare-earth carbonates in detail, focusing especially on the carbonates in order to detect both their stability, as a function of the rare-earth used, and their best synthesis conditions. In fact, whilst there are a lot of reports concerning the synthesis of rare-earth hydroxycarbonates (see for example [3,4,7,8,9,10,11,12,14,18,22,23]), to the best of our knowledge there are very limited studies focused on the synthesis methods and characterization of rare-earth carbonates, especially those with a tengerite-type structure. Furthermore, most of these studies are rather outdated [24] and often report contradictory results, and discussions, concerning the compositions and properties of the rare-earth carbonates, caused by a lack of structural data [25].…”