High Charge-Storage Performance of Morphologically Modified Anatase TiO<sub>2</sub>: Experimental and Theoretical Insight

Maharana, Basudeba; Ratha, Satyajit; Shajahan, Afsal S.; Chakraborty, Brahmananda; Jha, Rajan; Chatterjee, Shyamal

doi:10.1103/physrevapplied.15.034013

Cited by 8 publications

(3 citation statements)

References 63 publications

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“…The surface of the tapered part of the fiber was studied using a Scanning Electron Microscope (Merlin Compact with GEMINI-I column, Zeiss Pvt. Ltd., Germany) for both the pristine and the irradiated fibers . It is clear from Figure that the irradiated surface has been roughened a little more than the pristine fiber.…”

Section: Resultsmentioning

confidence: 96%

Detection of Energetic Ions Based on Tapered Optical Fiber

Rajbhar

Maharana

Patra

et al. 2023

ACS Appl. Opt. Mater.

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Single-mode tapered optical fibers (TOF) are well-known for applications in sensing. In this work, we demonstrate the use of tapered optical fibers to detect charged particles (ions) irradiated at various energies, fluences, and species. In this experiment, two different ion species, namely, Ar+ and N+, have been used to irradiate tapered optical fibers at various fluences and energies. The variations in the free spectral range (FSR), period, and transmission power loss from the ion beam irradiated TOFs are picked up by the optical spectrum analyzer (OSA). We were able to identify ions with energy as low as 80 keV because of the change in the refractive index of the cladding material caused by the implanted ions. The observed changes in spectra are explained using the results of COMSOL simulations. Using Monte Carlo-based TRI3DYN ion–solid interaction simulation, the surface modification and defect formation caused by ion beams as well as the implantation profile in the TOF have been predicted. These results are further corroborated by experimental studies such as scanning electron microscopy and Raman scattering spectroscopy. Such a tapered optical fiber-based detection method will aid in the creation of portable equipment to identify charged particles in nuclear reactors and in space exploration.

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Section: Resultsmentioning

confidence: 96%

Detection of Energetic Ions Based on Tapered Optical Fiber

Rajbhar

Maharana

Patra

et al. 2023

ACS Appl. Opt. Mater.

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“…53 For both specimens, the FWHM of the Ti 2p 3/2 signal is about 1.2 eV (Figure S8(a,b)). After deconvolution, the two strong peaks at 458.5 and 464.3 eV could be assigned to the Ti 4+ valence state, 54 whereas two small peaks at 456.6 and 461.2 eV could be related to the Ti 3+ valence states, which arise due to the oxygen vacancy. 55 Peaks linked with Ti 3+ grow stronger after irradiation, indicating an increase in oxygen vacancies following irradiation.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Core–Shell Nanostructures of Tungsten Oxide and Hydrogen Titanate for H₂ Gas Adsorption

Rajbhar

Das

Möller

et al. 2022

ACS Appl. Nano Mater.

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Nanostructured tungsten oxide is a promising material for sensing reducing gases such as hydrogen. However, this material exhibits limitations due to a poor response toward sensing at room temperature, incomplete recovery to the initial state, long response time, and a low response factor, which is not desired for explosive gases like hydrogen. In this work, we, for the first time, demonstrate that these limitations can be significantly overcome using the core–shell structure of tungsten oxide (WO3) nanorods and hydrogen titanate (H2Ti3O7) nanotubes developed and suitably defect-engineered by low-energy ion irradiation. The sensor based on the pristine core–shell heterostructure of tungsten oxide nanorods and hydrogen titanate nanotubes exhibits excellent response and selectivity to different concentrations of H2 ranging from 10 to 500 ppm. However, it requires a quite high temperature of 300 °C with response and recovery times of about 38 and 99.8 s, respectively. After irradiation, the hybrid form shows a similar level of response and selectivity, however, at a much lower temperature of about 120 °C with significantly faster response and recovery times of about 16 and 18 s, respectively. Such an ion beam-modified structure addresses critical issues of developing a gas-sensing device, such as the effects of moisture and power consumption. The experimental observations are very well in agreement with the predictions of the state-of-the-art Monte Carlo-based TRI3DYN ion-solid interaction simulation, and the gas-sensing mechanism was explained using first principles-based calculation. The study reveals that low-energy ion-induced defect engineering yields better charge transport, better binding of the gas with the surface, as well as the superior moisture-repelling ability of the surface, leading to better sensing performance than the pristine core-shell structure. This heterostructure between two nanomaterials carries complementary advantages in various aspects, such as the surface area, conductivity, and sensitivity toward a wide range and mixture of gases. Additionally, the wrapping yields good mechanical strength and flexibility, making it possible to use as a flexible sensing device made through a bottom-up fabrication technique.

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“…The EDLC material typical has high power density with low energy density, while a pseudocapacitive material has high energy density with moderate power density. When integrated into composite or hybrids, EDLC and pseudocapacitive materials will provide significant improvement which is otherwise could not be obtained individually 17 , 18 . Reduced graphene oxide can enhance the electrical conductivity, mechanical stability, and surface area of electrochemically active metal oxides for supercapacitor application, the use of reduced graphene oxide hybrid is one of the most effective routes 19 , 20 .…”

Section: Introductionmentioning

confidence: 99%

Experimental and computational investigation on the charge storage performance of a novel Al2O3-reduced graphene oxide hybrid electrode

Ratha

Sahoo

Mane

et al. 2023

Sci Rep

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The advancements in electrochemical capacitors have noticed a remarkable enhancement in the performance for smart electronic device applications, which has led to the invention of novel and low-cost electroactive materials. Herein, we synthesized nanostructured Al2O3 and Al2O3-reduced graphene oxide (Al2O3-rGO) hybrid through hydrothermal and post-hydrothermal calcination processes. The synthesized materials were subject to standard characterisation processes to verify their morphological and structural details. The electrochemical performances of nanostructured Al2O3 and Al2O3- rGO hybrid were evaluated through computational and experimental analyses. Due to the superior electrical conductivity of reduced graphene oxide and the synergistic effect of both EDLC and pseudocapacitive behaviour, the Al2O3- rGO hybrid shows much improved electrochemical performance (~ 15-fold) as compared to bare Al2O3. Further, a symmetric supercapacitor device (SSD) was designed using the Al2O3- rGO hybrid electrodes, and detailed electrochemical performance was evaluated. The fabricated Al2O3- rGO hybrid-based SSD showed 98.56% capacity retention when subjected to ~ 10,000 charge–discharge cycles. Both the systems (Al2O3 and its rGO hybrid) have been analysed extensively with the help of Density Functional Theory simulation technique to provide detailed structural and electronic properties. With the introduction of reduced graphene oxide, the available electronic states near the Fermi level are greatly enhanced, imparting a significant increment in the conductivity of the hybrid system. The lower diffusion energy barrier for electrolyte ions and higher quantum capacitance for the hybrid structure compared to pristine Al2O3 justify improvement in charge storage performance for the hybrid structure, supporting our experimental findings.

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High Charge-Storage Performance of Morphologically Modified Anatase TiO₂: Experimental and Theoretical Insight

Cited by 8 publications

References 63 publications

Detection of Energetic Ions Based on Tapered Optical Fiber

Detection of Energetic Ions Based on Tapered Optical Fiber

Core–Shell Nanostructures of Tungsten Oxide and Hydrogen Titanate for H₂ Gas Adsorption

Experimental and computational investigation on the charge storage performance of a novel Al2O3-reduced graphene oxide hybrid electrode

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High Charge-Storage Performance of Morphologically Modified Anatase TiO2: Experimental and Theoretical Insight

Cited by 8 publications

References 63 publications

Detection of Energetic Ions Based on Tapered Optical Fiber

Detection of Energetic Ions Based on Tapered Optical Fiber

Core–Shell Nanostructures of Tungsten Oxide and Hydrogen Titanate for H2 Gas Adsorption

Experimental and computational investigation on the charge storage performance of a novel Al2O3-reduced graphene oxide hybrid electrode

Contact Info

Product

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High Charge-Storage Performance of Morphologically Modified Anatase TiO₂: Experimental and Theoretical Insight

Core–Shell Nanostructures of Tungsten Oxide and Hydrogen Titanate for H₂ Gas Adsorption