Nitrogen and sulfur co-doped activated carbon nanosheets for high-performance coin cell supercapacitor device with outstanding cycle stability

Herein, we report the utilization of nitrogen and sulfur dual heteroatoms co-doped activated carbon (NSAC) by hydrothermal method for electrochemical supercapacitors. Various NSACs were made by using a fixed amount of activated carbon and changing the amounts of thioacetamide. From NSAC electrodes, the coin cell configuration was fabricated and the overall electrochemical conduct was evaluated by using cyclic voltammetry, galvanostatic charge-discharge, cycle life, and electrochemical impedance methodologies. The outcomes manifest that co-doping sulfur and nitrogen into the AC improves the electrochemical performance. In comparison to pure activated carbon, the optimized NSAC produced a higher specific capacitance value of 417 F g−1 at 0.7 A g−1 and also demonstrated outstanding charge-discharge cycling stability at 7 mA (5 A g−1), maintaining 76% of its opening capacitance after 60,000 cycles in the CR2032 device configuration. The impedance studies phase angle value of 85° has added evidence of the NSAC’s good capacitor performance. Thus, we believe this work is suitable for practical applications for energy storage devices. Graphical abstract: [Figure not available: see fulltext.]This work was supported by Qatar University through a National Capacity Building Program Grant (NCBP) [QUCP-CAM-20/23-463]. The publication of the article was funded by the Qatar National Library. Statements made herein are solely the responsibility of the authors

UV Induced Photodegradation of Direct Green dye by Tb-doped La10Si6O27 Catalyst

Due to the expansion of industry, the world's population growth has led to increased air and water contamination. Because they are poisonous and non-biodegradable, organic dyes are a significant source of this contamination. Studies have concentrated on photocatalysts to transform organic dyes into innocuous compounds in order to lessen the harm that organic colours cause. In this study, solution combustion technique was employed to prepare rare-earth metal (terbium (Tb)) doped lanthanum silicate phosphor (La10Si6O27) using lanthanum nitrate and fumed silica were utilized as precursors, oxalyldihydrazide was used as fuel, and terbium nitrate was used as a dopant. The photocatalytic activities for the Direct Green-23 (DG23) dye degradation under UV irradiation were studied and found that 59.05% of dyes degraded at 120 min. These findings shows that, La10Si6O27 is a promising material for industrial dye degradation since 59.05% of the dyes were absorbed by the material in 120 min.This work was supported by Qatar University through a National Capacity Building Program Grant (NCBP), [QUCP-CAM-2022-463]. The publication of the article was funded by Qatar National Library

Progressive Review of Functional Nanomaterials-Based Polymer Nanocomposites for Efficient EMI Shielding

Nanomaterials have assumed an imperative part in the advancement of human evolution and are more intertwined in our thinking and application. Contrary to the conventional micron-filled composites, the unique nanofillers often modify the properties of the polymer matrix at the same time, bestowing new functionality because of their chemical composition and their nano dimensions. The unprecedented technological revolution is driving people to adapt to miniaturized electronic gadgets. The sources of electromagnetic fields are ubiquitous in a tech-driven society. The COVID-19 pandemic has escalated the proliferation of electromagnetic interference as the world embraced remote working and content delivery over mobile communication devices. While EMI shielding is performed using the combination of reflection, absorption, and electrical and magnetic properties, under certain considerations, the dominant nature of any one of the properties may be required. The miniaturization of electronic gadgets coupled with wireless technologies is driving us to search for alternate lightweight EMI shielding materials with improved functionalities relative to conventional metals. Polymer nanocomposites have emerged as functional materials with versatile properties for EMI shielding. This paper reviews nanomaterials-based polymer nanocomposites for EMI shielding applications.This work was supported by Qatar University through a National Capacity Building Program Grant (NCBP), [QUCP-CAM-20/23-463]. Statements made herein are solely the responsibility of the authors

Recent Advances in Copper-Based Materials for Sustainable Environmental Applications

In recent years, copper-based nanomaterials have gained significant attention for their practical applications due to their cost-effectiveness, thermal stability, selectivity, high activity, and wide availability. This review focuses on the synthesis and extensive applications of copper nanomaterials in environmental catalysis, addressing knowledge gaps in pollution management. It highlights recent advancements in using copper-based nanomaterials for the remediation of heavy metals, organic pollutants, pharmaceuticals, and other contaminants. Also, it will be helpful to young researchers in improving the suitability of implementing copper-based nanomaterials correctly to establish and achieve sustainable goals for environmental remediation.This work was supported by Qatar University through a National Capacity Building Program Grant (NCBP), [QUCP-CAM-20/23-463]. Statements made herein are solely the responsibility of the authors

Emeraldine Base Form of Polyaniline Nanofibers as New, Economical, Green, and Efficient Catalyst for Synthesis of Z-Aldoximes

A facile, clean, economical, efficient, and green process was developed for the preparation of Z-aldoximes at room temperature under solvent-free condition using emeraldine base form of polyaniline as novel catalyst. In this methodology, PANI base absorbed the by-product of HCl (polluting chemical) from hydroxylamine hydrochloride and converted to polyaniline-hydrochloride salt (PANI-HCl salt). This PANI-HCl salt could be easily recovered and used in new attempts without any purification in many areas such as catalyst, electrical and electronics applications meant for conducting polymers. As far as our knowledge is concerned, emeraldine base as catalyst in organic synthesis for the first time

Magnetochemistry: materials and applications Materials research foundations ;, v. 66./ Edited by Inamuddin, Rajender Boddula and Abdullah M. Asiri.

Includes bibliographical references and index.The book covers the entire spectrum of magnetic nanomaterials and their highly interesting properties. Keywords: Magnetic Nanomaterials, Analytical Chemistry, Biomedical Science, Spintronics, Electrochemistry, Energy Storage, Energy Conversion, Membranes, Fuel Cells, Bio-Sensors, Electrocatalysis, Separation Processes, Hydrogen Storage, Supercapacitors, SERS Effect.Intro -- front-matter -- Table of Contents -- Preface -- 1 -- Magnetic Nanomaterials for Bio-Sensors based on SERS Effect -- 1. Introduction -- 2. Surface enhanced Raman spectroscopy -- 2.1 Mechanism of surface enhanced Raman scattering -- 2.2 Development of SERS active substrates -- 3. Progress of magnetic SERS substrate research -- 3.1 Iron oxide based SERS substrate -- 3.2 Nickel-based SERS substrate -- 3.3 Cobalt- ferrite based SERS substrate -- 4. Application of SERS in biosensors -- 4.1 Immunosensors -- 4.2 Microbial sensors -- 4.3 Nucleic acid sensors -- 4.4 Cell sensor4.5 Other biomolecular sensors -- Conclusions and Outlook -- References -- 2 -- Magnetic Nanomaterials for Electrocatalysis -- 1. Introduction -- 1.1 Industrial needs for energy and electrocatalysis -- 2. Fe-, Co-, Ni-based nanocomposite materials as electrocatalysts -- 2.1 Iron-based nanocomposite materials as electrocatalyst -- 2.1.1 Iron-based nanocomposite materials as electrocatalysts in water splitting -- 2.1.2 Iron-based nanocomposite materials as electrocatalyst in biomedicine -- 2.2 Cobalt-based nanocomposite materials as electrocatalyst2.3 Nickel-based nanocomposite materials as electrocatalyst -- 3. Structure and morphology of magnetic nanoparticles used in electrocatalysis -- 3.1 Spinel ferrites in nanoelectrocatalysis -- 3.1.1 Nanoelectrocatalytic applications of CuFe2O4-based nanocomposites -- 3.1.2 Nanoelectrocatalytic applications of CoFe2O4-based nanocomposites -- 3.1.3 Nanoelectrocatalytic applications of NiFe2O4-based nanocomposites -- 3.2 Size and morphology of magnetic nanoparticles used in electrocatalysis4. Influence of the synthesis parameters on the properties of nanocomposite materials of importance for catalysis -- 4.1 Main structural properties of the phases within investigated samples -- 4.2 Influence of the variation of Cu2+ precursor concentration on the CuFe2O4-based nanocomposite properties -- 4.3 Influence of the variation of Fe3+ precursor concentration on the CuFe2O4-based nanocomposite properties -- Conclusions -- References -- 3 -- Magnetic Nanomaterials for Separations -- 1. Introduction -- 2. Synthesis of MNPs -- 2.1 Physical methods used for the synthesis of MNPs2.1.1 Mechanical milling method -- 2.1.2 Vapour deposition method -- 2.1.3 Electrical explosion of wires (EEW) method -- 2.2 Chemical methods used for the synthesis of MNPs -- 2.2.1 Co-precipitation method -- 2.2.2 Thermal decomposition method -- 2.2.3 Hydrothermal method -- 2.2.4 Microemulsion method -- 3. Modification or functionalization of magnetic nanoparticles -- 4. What is separation? -- 5. Role of magnetic nanomaterials in separation -- 5.1 Separation by silica modified magnetic nanomaterials -- 5.2 Separation by alumina modified magnetic nanomaterials1 online resource (345 pages )