Relationship between the Bandgap and Electrochemical Behavior on TiO&lt;sub&gt;2&lt;/sub&gt; Nanoparticles Prepared Sonochemically

González-Reyes, Leonardo; Hernández-Pérez, I.; Arceo, Lucia Díaz-Barriga; Manzo-Robledo, A.

doi:10.4028/www.scientific.net/msf.691.105

Cited by 6 publications

(4 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All the electrochemical measurements were performed in a Na 2 SO 4 1 M (pH=6.5) solution at room temperature, using a PARSTAT 2273 (PAR EG&G Inc.) potentiostat/galvanostat/FRA controlled by a computer using the PowerSuite software (PAR EG&G Inc.). The pH was chosen in such a way to attain an isoelectric condition [62] and avoid charging the TiO 2 surface with H + or OH − ions.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Electrochemical synthesis of self-organized TiO₂crystalline nanotubes without annealing

Giorgi¹,

Dikonimos

Giorgi³

et al. 2018

Nanotechnology

View full text Add to dashboard Cite

This work demonstrates that upon anodic polarization in an aqueous fluoride-containing electrolyte, TiO nanotube array films can be formed with a well-defined crystalline phase, rather than an amorphous one. The crystalline phase was obtained avoiding any high temperature annealing. We studied the formation of nanotubes in an HF/HO medium and the development of crystalline grains on the nanotube wall, and we found a facile way to achieve crystalline TiO nanotube arrays through a one-step anodization. The crystallinity of the film was influenced by the synthesis parameters, and the optimization of the electrolyte composition and anodization conditions (applied voltage and time) were carried out. For comparison purposes, crystalline anatase TiO nanotubes were also prepared by thermal treatment of amorphous nanotubes grown in an organic bath (ethylene glycol/NHF/HO). The morphology and the crystallinity of the nanotubes were studied by field emission gun-scanning electron microscopy (FEG-SEM) and Raman spectroscopy, whereas the electrochemical and semiconducting properties were analyzed by means of linear sweep voltammetry, impedance spectroscopy, and Mott-Schottky plots. X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS) allowed us to determine the surface composition and the electronic structure of the samples and to correlate them with the electrochemical data. The optimal conditions to achieve a crystalline phase with high donor concentration are defined.

show abstract

Section: Electrochemical Characterizationmentioning

confidence: 99%

Electrochemical synthesis of self-organized TiO₂crystalline nanotubes without annealing

Giorgi¹,

Dikonimos

Giorgi³

et al. 2018

Nanotechnology

View full text Add to dashboard Cite

show abstract

“…The particle size and morphological features of a sample strongly influences its band gap energy, which is further important in determining its electrochemical activity . So, it is expected that the electrochemical performances of CZMS and CZNP will be different, which has indeed been observed in the electrochemical study.…”

Section: Resultsmentioning

confidence: 99%

Magnetic, Pseudocapacitive, and H₂O₂-Electrosensing Properties of Self-Assembled Superparamagnetic Co_0.3Zn_0.7Fe₂O₄with Enhanced Saturation Magnetization

et al. 2019

View full text Add to dashboard Cite

The present work explores the structural, microstructural, optical, magnetic, and hyperfine properties of Co 0.3 Zn 0.7 Fe 2 O 4 microspheres, which have been synthesized by a novel template-free solvothermal method. Powder X-ray diffraction, electron microscopic, and Fourier transform infrared spectroscopic techniques were employed to thoroughly investigate the structural and microstructural properties of Co 0.3 Zn 0.7 Fe 2 O 4 microspheres. The results revealed that the microspheres (average diameter ∼121 nm) have been formed by self-assembly of nanoparticles with an average particle size of ∼12 nm. UV–vis diffuse reflectance spectroscopic and photoluminescence studies have been performed to study the optical properties of the sample. The studies indicate that Co 0.3 Zn 0.7 Fe 2 O 4 microspheres exhibit a lower band gap value and enhanced PL intensity compared to their nanoparticle counterpart. The outcomes of dc magnetic measurement and Mössbauer spectroscopic study confirm that the sample is ferrimagnetic in nature. The values of saturation magnetization are 76 and 116 emu g –1 at 300 and 5 K, respectively, which are substantially larger than its nanosized counterpart. The infield Mössbauer spectroscopic study and Rietveld analysis of the PXRD pattern reveal that Fe 3+ ions have migrated from [B] to (A) sites resulting in the cation distribution: (Zn 2+ 0.46 Fe 3+ 0.54 ) A [Zn 2+ 0.24 Co 2+ 0.3 Fe 3+ 1.46 ] B O 4 . Comparison of electrochemical performance of the Co 0.3 Zn 0.7 Fe 2 O 4 microspheres to that of the Co 0.3 Zn 0.7 Fe 2 O 4 nanoparticles reveals that the former displays greater specific capacitance (149.13 F g –1 ) than the latter (80.06 F g –1 ) due to its self-assembled porous structure. Moreover, it was found that Co 0.3 Zn 0.7 Fe 2 O 4 microspheres possess a better electrochemical response toward H 2 O 2 sensing than Co 0.3 Zn 0.7 Fe 2 O 4 nanoparticles in a wide linear range.

show abstract

“…The MoS2 silk composite indicates a lower Tafel slope of 157.2 mV dec -1 than MoS2 (165.2 mV dec -1 ) (Fig. 8b), which indicate that the higher electrochemical activity of MoS2 silk are because of higher band gap [42,43].…”

Section: Visible-light Photodegradation Of Methylene Blue Dyementioning

confidence: 97%

Photocatalytic and Oxygen Evolution Reaction (OER) of Novel Supercritical Fluid Synthesized Nanobiocomposite MoS2/Silk G

Chetana,

Guddappa,

Upadhyay

et al. 2024

ajc

View full text Add to dashboard Cite

The photocatalytic activity and oxygen evolution reaction (OER) of MoS2 and silk graphene (silk G) composite synthesized using supercritical fluids and chemical vapor deposition (CVD) methods were investigated for their potential application in photocatalysis. This material was subjected to characterize by XRD, TEM, SEM and FTIR techniques to demonstrate that MoS2/silk G composite still existed in the supercritical fluids methods obtained MoS2 & MoS2/silk G. The optical features of MoS2 was improved by introduction of silk G, which inturn caused shift in band gap from 1.65 to 1.85 eV. Within visible region, creation of high electron-hole pairs is possible by adequate band gap modifications. The fast movement of photo-induced charge carrier can be enhanced by silk G as they decrease the recombination activity. Additionally, the MoS2/silk G shows high oxygen evolution reaction with low Tafel slope of 157.2 mV dec-1 and low overpotential of 603 mV at a current density of 10 mA cm-2. The present study signifies that with addition of silk G in the MoS2 host improved the photocatalytic activity by 13% and electrocatalytic activity by nearly 5% compared to bare MoS2 nanoparticles.

show abstract

Relationship between the Bandgap and Electrochemical Behavior on TiO<sub>2</sub> Nanoparticles Prepared Sonochemically

Cited by 6 publications

References 24 publications

Electrochemical synthesis of self-organized TiO₂crystalline nanotubes without annealing

Electrochemical synthesis of self-organized TiO₂crystalline nanotubes without annealing

Magnetic, Pseudocapacitive, and H₂O₂-Electrosensing Properties of Self-Assembled Superparamagnetic Co_0.3Zn_0.7Fe₂O₄with Enhanced Saturation Magnetization

Photocatalytic and Oxygen Evolution Reaction (OER) of Novel Supercritical Fluid Synthesized Nanobiocomposite MoS2/Silk G

Contact Info

Product

Resources

About

Relationship between the Bandgap and Electrochemical Behavior on TiO<sub>2</sub> Nanoparticles Prepared Sonochemically

Cited by 6 publications

References 24 publications

Electrochemical synthesis of self-organized TiO2crystalline nanotubes without annealing

Electrochemical synthesis of self-organized TiO2crystalline nanotubes without annealing

Magnetic, Pseudocapacitive, and H2O2-Electrosensing Properties of Self-Assembled Superparamagnetic Co0.3Zn0.7Fe2O4with Enhanced Saturation Magnetization

Photocatalytic and Oxygen Evolution Reaction (OER) of Novel Supercritical Fluid Synthesized Nanobiocomposite MoS2/Silk G

Contact Info

Product

Resources

About

Electrochemical synthesis of self-organized TiO₂crystalline nanotubes without annealing

Electrochemical synthesis of self-organized TiO₂crystalline nanotubes without annealing

Magnetic, Pseudocapacitive, and H₂O₂-Electrosensing Properties of Self-Assembled Superparamagnetic Co_0.3Zn_0.7Fe₂O₄with Enhanced Saturation Magnetization