Modification of Graphene Oxide/V₂O₅·nH₂O Nanocomposite Films via Direct Laser Irradiation

Abstract

Herein, photothermal modification of nanocomposite films consisting of hydrated vanadium pentoxide (V 2 O 5 · n H 2 O) nanoribbons wrapped with graphene oxide (GO) flakes was performed via 405 nm direct laser irradiation. The combination of X-ray diffraction, X-ray photoelectron spectroscopy, Raman scattering, transmission electron microscopy, and scanning electron microscopy allowed comprehensive characterization of physical and chemical changes of GO/V 2 O 5 · n H 2 O nanocomposite films upon photothermal modification. The modified nanocomposite films exhibited porous surface morphology (17.27 m 2 g –1 ) consisting of randomly distributed pillarlike protrusions. The photothermal modification process of GO/V 2 O 5 · n H 2 O enhanced the electrical conductivity of nanocomposite from 1.6 to 6.8 S/m. It was also determined that the direct laser irradiation of GO/V 2 O 5 · n H 2 O resulted in considerable decrease of C–O bounds as well as O–H functional groups with an increase of the laser power density.

Polyaniline Encapsulated Amorphous V2O5 Nanowire‐Modified Multi‐Functional Separators for Lithium–Sulfur Batteries

“…The high‐resolution V2p spectra of the VOH and VOH@PANI are shown in Figure 2e, two peaks corresponding to the spin‐orbit of V2p 3/2 and V2p 1/2 are located in the energy range of 516 and 526 eV, which can be divided into two peaks of V 5+ and V 4+ . [ 30,57 ] Obviously, the intensities of V 4+ peaks in the VOH (516.6 and 523.9 eV) are lower than that of the VOH@PANI (516.5 and 523.7 eV), revealing that more V 5+ are reduced into V 4+ during the aniline polymerization process. [ 58 ] Furthermore, the binding energy of V 5+ in V2p 3/2 is blue‐shifted to 517.3 eV for VOH@PANI, indicating the electron transfer between PANI and vanadium atoms.…”

“…[ 26–28 ] Among the various reported V 2 O 5 , amorphous V 2 O 5 (hydrated vanadium pentoxide, general formula V 2 O 5 · n H 2 O, and abbreviated as VOH) is more attractive than the crystalline V 2 O 5 . [ 29,30 ] The long‐range disordered structure will introduce structural defects which in turn provide active sites for the adsorption of LiPSs. [ 31,32 ] A large amount of defects within VOH further strengthen the catalytic activity towards LiPSs conversion.…”

Interconnected Vanadyl Pyrophosphate Nanonetworks as a Flexible Electrode for High-Voltage and Long-Life Li-Ion Supercapacitors

“…The corresponding peaks with binding energies of ∼523.9 and ∼516.1 eV are assigned to the 2p 1/2 and 2p 3/2 orbits of V 4+ , respectively, and the peaks with binding energies of ∼525.7 and ∼517.2 eV are attributed to the 2p 1/2 and 2p 3/2 levels of V 5+ . , The O 1s spectrum of the VO-CC sample was divided into two peaks as shown in Figure S7d. There were two binding energies situated at ∼530.3 and ∼531.4 eV that could be associated with the V–O bonding and V–OH bonding . Moreover, the high-resolution O 1s spectrum of the VP-CC sample after phosphorization is shown in Figure f.…”

“…There were two binding energies situated at ∼530.3 and ∼531.4 eV that could be associated with the V−O bonding and V−OH bonding. 28 Moreover, the high-resolution O 1s spectrum of the VP-CC sample after phosphorization is shown in Figure 2f. For comparison, the O 1s spectrum of the VP-CC sample peaks was slightly shifted from that of the VO-CC sample, which can be attributed to the formation of new metal phosphate ((PO 4 ) 3− ) during phosphorization.…”

Recent Development in Vanadium Pentoxide and Carbon Hybrid Active Materials for Energy Storage Devices

“…In addition to heat treatment, the morphology and crystallinity of a VrG composite can be altered by laser irradiation. Lazauskas et al first synthesized a V 2 O 5 /GO nanoribbon composite using a melt-quenching process and further applied laser treatment to reduce GO to rGO [83]. A 405-nm laser was used to irradiate specific regions of the V 2 O 5 /GO composite, resulting in a VrG composite with surface protrusions.…”