Rapid Large‐Scale Synthesis of Vanadate Nanoscrolls with Controllable Lengths

Abstract

As imple one-step solvothermal synthetic approach has been applied to the rapid fabrication of VO x nanoscrolls( NScs) from vanadium pentoxide and either dodecylamineo roctadecylamine as the structure-directing agent (SDA). By reaction of the appropriate ratio of SDA to vanadium oxide and solventa t2 50 8C, approximately 20 go fN Scs per synthesis could be formed within 2h.S yntheses couldb ef urther adjusted so that the average lengths of the NScs could be varied from approximately 383 to 816 nm to 3.3 mm. The effect of synthesis parameters such as temperature, solvothermalr eaction duration, and vanadium oxidation state on the formation of NScs was also investigated;d etailed studies indicate that the variation between V 4 + andV 5 + appears to play acriticalrole in the formationo fv anadate NScs.

Process Development and DFT‐Assisted Mechanism of the Vapour Phase Ammoxidation of 2,6‐Dichlorotoluene to 2,6‐Dichlorobenzonitrile over the V2O5/γ‐Al2O3 Catalyst

“…The binding energies of the V2p levels split into V2p 3/2 and V2p 1/2 . While the former(V2p 3/2 ) appeared in the range 514–519 eV the latter (V2p 1/2 ) appeared in the range 522–525 eV . The line width of V2p 1/2 is much broader than that of V2p 3/2 .…”

“…The relative abundance of V 4+ and V 5+ is calculated from the deconvoluted peak areas. In fresh catalyst, V2p 3/2 is deconvoluted into two peaks assigned to tetravalent (516.23 eV) and pentavalent (517.37 eV) vanadium species, whereas in spent catalyst V2p 3/2 peak is deconvoluted into three peaks . Assignment are shown in Table .…”

Formation of Mixed‐Metal Ceria Nanopeapod Composites within Scrolled Hexaniobate Nanosheets

“…Similar synthetic routes, with variations in the amount of surfactants, cerium precursor, and solvothermal temperature/time, were applied to the synthesis of NPs averaging in size 23 (7) nm and 38 (8) nm, and the mixture of small and big cubes ranging from 5 to 70 nm (Table 1). While most reactions were carried out in 23 mL autoclave, the latter reaction was done in a 125 mL Teflon-lined stainless-steel autoclave (Parr, model 4748, 1900 psi); this reaction was carried out for 12 h at 190°C and then 220°C for 2.5 h.…”

“…Scrolling of exfoliated/lamellar nanosheets (NSs) into tubular nanoscroll (NSc) morphologies has also been investigated and shown to be possible for a variety of inorganic materials such as V 2 O 5 , graphite, layered chalcogenides, and K 4 Nb 6 O 17 . Acid‐exchanged hexaniobate (H x K 4‐x Nb 6 O 17 ) is one of the structures that can be exfoliated and, through a simple solvothermal synthesis method, transformed into a scrolled geometry in order to relieve structural strain .…”

V6O13−δ@C Nanoscrolls with Expanded Distances between Adjacent Shells as a High‐Performance Cathode for a Knittable Zinc‐Ion Battery

“…The tailoring of materials into a hierarchical structure is an important strategy to promote their performance . Recently, central hollow scrolls with spiral‐wrapped multiple shells and a 1 D tubular structure have attracted particular attention . This unique structure not only has sufficient active sites for high energy storage but also provides fast pathways for ion transport.…”