Doped V2O5 Research Articles

Photocatalytic degradation performance of Nd3+ doped V2O5 nanostructures

Bougainvillea flower extract was used as a fuel in solution combustion synthesis of pure and Nd3+ (1–9 mol %) doped vanadium pentoxides (V2O5) nanostructure. Powder x-ray Diffractogram, Scanning electron microscopy and Transmission electron microscopy images revealed the orthorhombic phase in Nd3+ doped V2O5 nanostructure. The additional peaks in Fourier Transform Infrared spectra and in Raman spectra were due to lattice distortion and mixed valence oxide in VO4 led to structural and morphological changes. The synthesized Nd3+ doped V2O5 nanostructure exhibited good photocatalytic activity for the degradation of Methylene blue dye due to decrease in its work function as well as decrease in electron-hole recombination.

Influence of Sn ion doping on the photocatalytic performance of V2O5 nanorods prepared by hydrothermal method

Pure and different concentrations of Sn4+ doped V2O5 (Sn:V2O5) nanorods were synthesized by hydrothermal method. The Sn:V2O5 nanorods obtained were orthorhombic in structure. No secondary phase was observed up to 10% of Sn doping, but beyond that, there evolved a secondary phase of SnO2. Microstructural analysis revealed the morphology of V2O5 as nanorods and platelets like structure. Presence of V, O and Sn elements in the samples was confirmed by energy dispersive spectroscopy. The V2O5 nanorods have shown a strong absorption in the visible region and the band gap energy was obtained to be varying from 2.21 to 2.26 eV as a function of Sn ion doping. Photocatalytic studies on methylene blue (MB) under visible light irradiation showed that the 3% Sn:V2O5 had effectively degraded MB up to a maximum degradation of 96% and further increase in Sn content had decreased the photodegradation due to higher recombination rate of photogenerated electrons. The mechanism of photodegradation was completely understood and the OH· radicals have played a dominant role in the photodegradation of the organic dyes.

Effects of doping concentration on structural, morphological, optical and electrical properties of tungsten doped V2O5 nanorods

Pure and tungsten-doped V2O5 (WxV2O5; x = 5%, 10% and 15%) nanorods were produced by the wet chemical method followed by annealing at 60 °C for 12 h and 600 °C for 1 h. The influence of dopant concentration on the structural, morphological, optical and electrical properties of V2O5 nanorods were investigated through XRD, SEM-EDS, TEM, PL and DC conductivity studies. XRD pattern analysis reveals that the pure and tungsten doped samples are annealed at 60 °C exhibits anorthic phase and annealed at 600 °C, the anorthic is phase disappeared and emerged as an orthorhombic phase. Also, structural analysis shows that the WxV2O5 (x = 15%) lattice is found to be secondary phase. The gradual morphological transformation of nanostructures due to the incorporation of tungsten is depicted through SEM/TEM characterizations. The relative differential structure of tungsten-doped V2O5 nanorods is promptly registered by SEM analysis. EDS result confirms the presence of tungsten and also oxygen vacancies in doped V2O5. The PL quenching was observed with doping is due to the absorption of energy from the defect emission in the V5+ lattice by W6+ ions. DC conductivity of WxV2O5 with respect to different temperatures is explained by the presence of defects. Further, the colloidal form of pure and n-WxV2O5 is used to deposit on p-Si substrate for formation of p-n junction by the nebulizer spray technique and the properties of fabricated diodes are investigated under dark and illumination conditions. Also, the Norde's method is used to evaluate the series resistance and barrier height of the Schottky contact. Further, the transient photocurrent measurements were carried out to analyze the photoresponse of the developed diodes.

Preparation and Electrochemical Performances of Sn4+ Doped V2O5 as Cathode material for Li Ion Battery

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Al3+ Doped V2O5 Nanoparticles as a Cathode Material for Rechargeable Lithium Batteries

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Performance of copper-doped V2O5 xerogel in coin cell assembly

Copper-doped, vanadium pentoxide xerogel is prepared through a simple sol–gel procedure, followed by heterogeneous doping and freeze-drying. Composite cathodes were formed by spray-coating a mixture of the Cu-doped material, carbon, and binder onto aluminum foils. The composite cathodes were studied in 2016 coin cells with lithium anodes and supported liquid electrolyte. The electrochemical performance of the doped material is excellent. Up to 2.2 mol of lithium per mol of doped V2O5 can be reversibly intercalated. The composite cathodes also showed very high intercalation rate performance and an excellent cyclability with no capacity fading over a few hundred cycles (>450).

Electrochromic phenomena in transition metal oxide thin films prepared by thermal evaporation

We present an experimental study on the electrochromic properties of MoO3, WO3 and mixed WO3-MoO3 thin films prepared by thermal evaporation. We have constructed symmetric and quasi-symmetric electrochromic cells incorporating the evaporated oxide films as electrochromic layers. Li+ doped V2O5 films served as ion storage layers. The symmetric cells were found to exhibit significantly improved optical properties compared to the quasi-symmetric ones, with very low luminous transmittance values in the colored state, which makes them suitable for large-area window applications.