Bulk synthesis of tungsten-oxide nanomaterials by a novel, plasma chemical reactor configuration, studies on their performance for waste-water treatment and hydrogen evolution reactions

Rahman, Mizanur; Sarmah, Trinayan; Dihingia, Pubali; Verma, Rajan; Sharma, Swati; Parashar, Kirti; Srivastava, Divesh N.; Pandey, Lalit M.; Kakati, M.

doi:10.1016/j.cej.2021.131111

Cited by 22 publications

(9 citation statements)

References 49 publications

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“…During the synthesis of the sample M1, the target temperature is measured with a K-type thermocouple as 950 °C. So, it may be concluded that during the current experiment, the Mo surface is first getting rapidly oxidized under the exposure of the highly reactive O radicals to form molybdenum-oxide that gets sublimated immediately after the formation [40]. The oxide vapour undergoes a large under-cooling as it is swept away by the plasma jet, out of which nanoparticles of stoichiometric molybdenum-oxide are nucleated through the gasphase condensation process.…”

Section: A Novel One-step Synthesis Technique Of Nanometric Moo 3−x W...mentioning

confidence: 81%

“…Oxygen is injected immediately downstream of the anode of the segmented-arc, where the electrons are not energetic enough for the dissociation and the ionization of the molecules. Under such a situation, highly reactive atomic oxygen radicals are still produced by the charge exchange reactions, followed by the dissociative recombination process [40,41]. During the current experiment, hydrogen is also injected, not at the torch electrodes, but directly into the vacuum chamber, away from the plasma jet.…”

Section: A Novel One-step Synthesis Technique Of Nanometric Moo 3−x W...mentioning

confidence: 99%

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A single-step plasma method for rapid production of 2D, ferromagnetic, surface vacancy-engineered MoO_3−x nanomaterials, for photothermal ablation of cancer

Rahman¹,

Pemmaraju²,

Murty³

et al. 2023

Nanotechnology

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A rapid, clean plasma-chemical technique is demonstrated here, for cost-effective, synthesis of surface vacancy engineered, 2D, molybdenum-oxide nanomaterials, during a one-step, integrated synthesis-hydrogenation process for biomedical applications. A laminar plasma beam populated with O and H radicals impinges on a molybdenum target, out of which molybdenum-oxide nanomaterials are very rapidly generated with controlled surface O vacancies. 2D, dark-blue coloured, nano-flake/ribbon like MoO3-x is produced maximum up to 194 g/h, the core of which still remains as stoichiometric molybdenum-oxide. These nanomaterials can get heated-up by absorbing energy from a near-infrared (NIR) laser, which enable them as photothermal therapy (PTT) candidate material for the invasive precision therapy of cancer. The surface defects endows the products with robust ferromagnetism at room temperature conditions (maximum saturation-magnetization: 6.58 emu/g), which is order of magnitude stronger than most other vacancy engineered nanomaterials. These nanometric metal-oxides are observed to be perfectly compatible in animal physiological environment and easily dispersed in an aqueous solution even without any pre-treatment. The MoO3-x nanomaterials are stable against further oxidation even under prolonged atmospheric exposure. In-vitro experiments confirm that they have ideal efficacy for photothermal ablation of human and murine melanoma cancer at relatively lower dose. During in-vivo PTT treatments, they may be manipulated with a simple external magnetic field for targeted delivery at the malignant tumours. It is demonstrated that commensurate to the neutralization of the malignant cells, the nanomaterials themselves get self-degraded, which should get easily excreted out of the body.

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Section: A Novel One-step Synthesis Technique Of Nanometric Moo 3−x W...mentioning

confidence: 81%

Section: A Novel One-step Synthesis Technique Of Nanometric Moo 3−x W...mentioning

confidence: 99%

A single-step plasma method for rapid production of 2D, ferromagnetic, surface vacancy-engineered MoO_3−x nanomaterials, for photothermal ablation of cancer

Rahman¹,

Pemmaraju²,

Murty³

et al. 2023

Nanotechnology

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“…The ECSA helps in evaluating the area of the reacting surface of the electrode and permits the comparison to other intrinsic catalytic performances of the materials . The ECSA was calculated using the following equation: A ECSA = C dl C normals nobreak0em.25em⁡ ( per cm 2 ) where C s is the specific capacitance of the catalyst and is estimated to be 40 μF in an alkaline electrolyte. The ECSA of the HNNS catalyst was found to be 6.72 cm 2 , which is almost double the ECSA values of NiAl 2 C (4.42 cm 2 ) and PCE (3.2 cm 2 ).…”

Section: Resultsmentioning

confidence: 99%

Single-Step Synthesis of Well-Ordered Hierarchical Nickel Nanostructures for Boosting the Oxygen Evolution Reaction

et al. 2022

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Transition metal dichalcogenides (TMDCs) as electrocatalysts have been explored as active noble-metal-free porous structures with a high surface area for active metal centers for the oxygen evolution reaction (OER). Herein, we report the facile synthesis of a hierarchical nickel carbide nanostructure (HNNS) from nickel aluminum carbide for the OER. A synthesized nanostructured electrocatalyst shows better OER performance compared to a bare plastic chip electrode and nickel aluminum carbide. The electrocatalytic performance for the HNNS achieved the current density of 10 mA cm–2 at an overpotential of 175 mV with a Tafel slope of 54 mV dec–1 in an alkaline medium. The facile synthesis and intensified OER activity make it convenient to fabricate efficient and stable electrodes for well-functioning electrochemical water splitting. The obtained results were compared to the standard catalyst and are better than those attained by the previously reported state-of-the-art transition-metal-based electrocatalyst. This work effectively improves ceaseless efforts toward low-cost electrocatalysts by taking advantage of the merits of TMDCs and will provide more opportunities for their utilization in electrochemical applications.

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“…Chemically prepared rGO is deposited over current collectors by coating, along with suitable binders. So, the choice of collectors is crucial for these supercapacitive applications [15].…”

Section: Introductionmentioning

confidence: 99%

A Biodegradable Polymer-Based Plastic Chip Electrode as a Current Collector in Supercapacitor Application

2022

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Here, we report the performance of a biodegradable polymer-based Plastic chip Electrode (PCE) as a current collector in supercapacitor applications. Its production was evaluated using two redox materials (conducting polymers polyaniline and poly(3,4-ethylene dioxythiophene)) and a layered material, rGO. The conducting polymers were directly deposited over the Eco-friendly PCE (EPCE) using the galvanostatic method. The rGO was prepared in the conventional way and loaded over the EPCE using a binder. Both conducting polymers and rGO showed proper specific capacitance compared to previous studies with regular current collectors. Electrodes were found highly stable during experiments in high acidic medium. The supercapacitive performance was evaluated with cyclic voltammetry, charge–discharge measurements, and impedance spectroscopy. The supercapacitive materials were also characterized for their electrical and microscopic properties. Polyaniline and PEDOT were deposited over EPCEs showing >150 Fg−1 and >120 Fg−1 specific capacitance, respectively, at 0.5 Ag−1. rGO continued to show higher particular capacitance of >250 Fg−1 with excellent charge–discharge cyclic stability. The study concludes that EPCs can be used as promising electrodes for electrical energy storage applications.

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Bulk synthesis of tungsten-oxide nanomaterials by a novel, plasma chemical reactor configuration, studies on their performance for waste-water treatment and hydrogen evolution reactions

Cited by 22 publications

References 49 publications

A single-step plasma method for rapid production of 2D, ferromagnetic, surface vacancy-engineered MoO_3−x nanomaterials, for photothermal ablation of cancer

A single-step plasma method for rapid production of 2D, ferromagnetic, surface vacancy-engineered MoO_3−x nanomaterials, for photothermal ablation of cancer

Single-Step Synthesis of Well-Ordered Hierarchical Nickel Nanostructures for Boosting the Oxygen Evolution Reaction

A Biodegradable Polymer-Based Plastic Chip Electrode as a Current Collector in Supercapacitor Application

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Bulk synthesis of tungsten-oxide nanomaterials by a novel, plasma chemical reactor configuration, studies on their performance for waste-water treatment and hydrogen evolution reactions

Cited by 22 publications

References 49 publications

A single-step plasma method for rapid production of 2D, ferromagnetic, surface vacancy-engineered MoO3−x nanomaterials, for photothermal ablation of cancer

A single-step plasma method for rapid production of 2D, ferromagnetic, surface vacancy-engineered MoO3−x nanomaterials, for photothermal ablation of cancer

Single-Step Synthesis of Well-Ordered Hierarchical Nickel Nanostructures for Boosting the Oxygen Evolution Reaction

A Biodegradable Polymer-Based Plastic Chip Electrode as a Current Collector in Supercapacitor Application

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A single-step plasma method for rapid production of 2D, ferromagnetic, surface vacancy-engineered MoO_3−x nanomaterials, for photothermal ablation of cancer

A single-step plasma method for rapid production of 2D, ferromagnetic, surface vacancy-engineered MoO_3−x nanomaterials, for photothermal ablation of cancer