Effect of Co-doping in V2O5 nanoparticles synthesized via a gelatin-based sol-gel method

Yazdi, Sh. Tabatabai; Mousavi, Maryam; Khorrami, Gh.H.

doi:10.1016/j.mtcomm.2020.101955

Cited by 11 publications

(4 citation statements)

References 45 publications

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“…An alternative to the versatile hydrothermal process is the sol-gel method, which is a low-cost synthesis strategy that involves the formation of a V 2 O 5 sol that is converted into a gel via hydrolysis and condensation reactions. The resulting porous V 2 O 5 xerogel can be used as a free-standing, binderless material used directly as a supercapacitor electrode [61]. Yilmaz et al utilized the sol-gel synthesis route to fabricate free-standing VrG electrodes [62].…”

Section: Effects Of Synthesis Methodsmentioning

confidence: 99%

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

et al. 2021

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With the increasing energy demand for portable electronics, electric vehicles, and green energy storage solutions, the development of high-performance supercapacitors has been at the forefront of energy storage and conversion research. In the past decade, many scientific publications have been dedicated to designing hybrid electrode materials composed of vanadium pentoxide (V2O5) and carbon nanomaterials to bridge the gap in energy and power of traditional batteries and capacitors. V2O5 is a promising electrode material owing to its natural abundance, nontoxicity, and high capacitive potential. However, bulk V2O5 is limited by poor conductivity, low porosity, and dissolution during charge/discharge cycles. To overcome the limitations of V2O5, many researchers have incorporated common carbon nanostructures such as reduced graphene oxides, carbon nanotubes, carbon nanofibers, and other carbon moieties into V2O5. The carbon components facilitate electron mobility and act as porous templates for V2O5 nucleation with an enhanced surface area as well as interconnected surface morphology and structural stability. This review discusses the development of various V2O5/carbon hybrid materials, focusing on the effects of different synthesis methods, V2O5/carbon compositions, and physical treatment strategies on the structure and electrochemical performance of the composite material as promising supercapacitor electrodes.

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Section: Effects Of Synthesis Methodsmentioning

confidence: 99%

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

et al. 2021

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“…Among them, vanadium pentoxide (V 2 O 5 ) is favorable for demonstrating high OER performances because of its cost-effectiveness, simple synthesis process, layered structure, high redox-active sites, and intrinsically nonexplosive safe characteristics [14][15][16][17]. To obtain the high-quality V 2 O 5 nanostructures, there are several synthesis methods such as sonochemical [18,19], sol-gel [20], acid leaching [21], electrospinning [22,23], laser irradiation [24], spray pyrolysis [25], hydrothermal [26][27][28],…”

Section: Introductionmentioning

confidence: 99%

Substantial Electrocatalytic Oxygen Evolution Performances of Activated Carbon-Decorated Vanadium Pentoxide Nanocomposites

Sekar,

Ilanchezhiyan,

Ahmed

et al. 2024

International Journal of Energy Research

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Developing the ecofriendly and high-fidelity electrocatalysts for the oxygen evolution reaction (OER) is essential to foster effective production of environmentally friendly hydrogen. Herein, we fabricated the highly efficient OER electrocatalysts of the activated carbon-decorated vanadium pentoxide (AC-V2O5) nanocomposites using a facile hydrothermal technique. The AC-V2O5 nanocomposites displayed an aggregated structure of the AC nano-sheet-anchored orthorhombic V2O5 nanorods. When performing the OER process in an alkaline electrolyte at 10 mA/cm2, AC-V2O5 exhibited the low overpotential (~230 mV), small Tafel slope (~54 mV/dec), and excellent stability. These substantial OER performances of AC-V2O5 could be ascribed to the synergistic effects from both the electrochemically active V2O5 nanorods and the highly conductive AC nanosheets. The results infer that the AC-V2O5 nanocomposites possess a substantial aptitude as a high-performance OER electrocatalyst for production of the future green energy source—hydrogen.

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Section: Introductionmentioning

confidence: 99%

“…However, little is known about the magnetic properties of V 2 O 5 nanoparticles. The few available studies on magnetism in nanoparticles are about V 2 O 5 with other compounds 28,29 , but there is, to the best of our knowledge, no one about pure V 2 O 5 nanoparticles.There are also various theoretical investigations about V 2 O 5 . Density Functional Theory (DFT) calculations show that the band structure of the material is characterized by a valence band that is mainly composed of oxygen 2p orbitals while the conduction band is made of vanadium 3d orbitals 30 .…”

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confidence: 99%

Tuning electronic and magnetic properties through disorder in V2O5 nanoparticles

Correal

Hernández-Gómez

Esquivel

et al. 2023

Sci Rep

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We report on the synthesis and characterization of V2O5 nanoparticles grown using a sol–gel method at different calcination temperatures. We observed a surprising reduction in the optical band gap from 2.20 to 1.18 eV with increasing calcination temperature from 400 to 500 °C. Raman and X-Ray diffraction measurements indicated slight changes in the lattice parameters induced by the growth process. However, density functional theory calculations of the Rietveld-refined and pristine structures revealed that the observed optical gap reduction could not be explained by structural changes alone. By introducing oxygen vacancies to the refined structures, we could reproduce the reduction of the band gap. Our calculations also showed that the inclusion of oxygen vacancies at the vanadyl position creates a spin-polarized interband state that reduces the electronic band gap and promotes a magnetic response due to unpaired electrons. This prediction was confirmed by our magnetometry measurements, which exhibited a ferromagnetic-like behavior. Our findings suggest that oxygen vacancies play a crucial role in band gap reduction and the promotion of a ferromagnetic-like response in an otherwise paramagnetic material. This provides a promising route to engineer novel devices.

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Effect of Co-doping in V2O5 nanoparticles synthesized via a gelatin-based sol-gel method

Cited by 11 publications

References 45 publications

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

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

Substantial Electrocatalytic Oxygen Evolution Performances of Activated Carbon-Decorated Vanadium Pentoxide Nanocomposites

Tuning electronic and magnetic properties through disorder in V2O5 nanoparticles

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