NiFe2O4 Research Articles

Synthesis and Characterizations of Nano Magnetic Particles (Co- Ni Fe2O4) Ferrite by Co-precipitation and Biomedical Application

Characterization of Cox-1Nix Fe2O4 nanoparticles (NPs) employing X-ray diffraction and fieldemission scanning electron microscopy (FESEM) was accomplished simply by chemical coprecipitation,FTIR and finally the Magnetic Resonance Spectrometer (VSM), the singlephasecubic spinel structure in X-ray diffraction. In FESEM, micrographs of Co ferritesnanoparticles that are virtually spherical can be seen with grain sizes of less than 20 nm.Two absorption bands are visible in the FTIR spectrum, with values ranging from 400-600cm. These beams show that all of the samples have a ferrite spectral composition.Preparation of samples yielded M-H curves because of the tight turn, which means the papersamples are soft magnetic material in the VSM. Antibacterial activity of Cox-1Nix Fe2O4 NPsin limiting the development of isolated pathogenic bacteria Staphylococcus aureus and E.coli was studied to compare their effects with the traditional antibiotics used before. UsingCox-1Nix Fe2O4 nanoparticles, it has been found that the nanoparticles release ions into theenvironment, which interacts with the group (-SH) of proteins, resulting in the defection ofbacteria's cell membranes and the subsequent cell death.

A study on BaTiO3 – NiFe2O4 composite; microstructure, multiferroic and magnetodielectric properties

The lead-free x NiFe2O4 – (1-x) BaTiO3 (x = 0, 0.05, 0.1, 0.15) multiferroic composites were prepared via the solid-state sintering technique. Microstructure, multiferroic, and magnetodielectric properties of composites were investigated. According to the XRD data (from x = 5 to 15 wt%), the tetragonality factor (cT/aT) and unit cell volume of the BaTiO3 (BTO) crystal system diminished. Based on SEM images, ferromagnetic NiFe2O4 (NFO) grains are uniformly dispersed in the ferroelectric BTO matrix without additional reaction in the interfaces of two phases. The highest values of dielectric (dielectric constant (εr) ∼ 1905 and dielectric loss factor (tan δ) ∼ 0.049) and ferroelectric properties (saturation polarization (PS) ∼ 13 μC/cm2 and remnant polarization (Pr) ∼ 10 μC/cm2) are attained for x = 5 wt% due to the lowest NFO (non-ferroelectric) concentration. Also, with increasing ferrite concentration (up to 15 wt%), the ferroelectric properties of the composites show a gradual decrease. The saturation magnetization (MS) values rise due to increasing ferrite concentration (from 2 to 5 emu/g for x = 5 to 15 wt%). Moreover, coercivity (HC) drops from 150 to 110 Oe. The simultaneous observation of the ferroelectric and ferromagnetic characteristic hysteresis loops confirmed the multiferroic effect for x = 5, 10, and 15 wt%. The highest magnetodielectric constant (3 %) is obtained for x = 15 wt% multiferroic composite at the applied magnetic field of 6 kOe.

Magnetic field-assisted vertically aligned NiFe2O4 nanosheets in composite solid polymer electrolytes for advanced all solid-state lithium metal batteries

Two-dimensional materials (2D Ms) as fillers have been applied in polyethylene oxide (PEO)-based electrolyte to enhance the low ionic conductivity and poor interface compatibility. However, the randomly dispersed fillers in PEO matrix result in anisotropy of Li+ transportation and insufficent ionic conductivity. Herein, NiFe2O4 (NFO) nanosheets are firstly introduced in polymer matrix to form vertically aligned NFO-PEO (ANFO-PEO) composite solid-state electrolytes (CSEs) through magnetic field-assisted alignment strategy. The vertically aligned NFO/PEO interface in CSEs can construct oriented Li+ transport channels and maximize the utilization of high in-plane conductivity. Meanwhile, the NFO nanosheets with abundant oxygen vacancies could effectively anchor TFSI− to promote the dissociation of Li salts. Furthermore, the optimized Li+ transport flux in CSEs enables homogeneous Li deposition and effectively mitigates the growth of dendrites. Owing to the synergistic effects, the ANFO-PEO CSEs exhibit high ionic conductivity (9.16 × 10−4 S cm−1 at 60 °C) and stable potential window up to 5.0 V vs Li/Li+. Therefore, LiFePO4 in the full cell and pouch cell with ANFO-PEO CSEs could deliver excellent cycling performance (92.78 % capacity retention after 1000 cycles at 0.5C; 96.88 % capacity retention after 105 cycles at 0.1C).

Self-driving photothermal anode electrocatalyst towards the robust OER for water electrolysis

The hydrogen production of water electrolysis is a potential technique route of clean energy exchange, but suffering from the sluggish oxygen evolution reaction (OER) owing to its four-electron step. In this work, we presented a significant improvement in the OER activity by photothermally triggering P-doped NiFe2O4 (NFO–P) electrocatalyst. As compared to the NiFe2O4 (NFO) catalyst, the excellent PEC performance of robust NFO–P is a result of more readliy generated active sites (Ni(III)), evidencing by the in-situ Raman spectra and polarization curves. With the near-infrared (λ = 808 nm) irradiation, the NFO–P surface temperature increases from 37 to 73 °C, and the NFO–P delivers a current density of 10 mA cm−2 at a pretty low overpotential of 191 mV (10 W/cm2), outperforms most OER catalysts including noble oxides. Photothermal enhancement in OER is attributed to photogenerated hot carriers and thermal activation. The thermal effect accelerates the kinetics, while with the assistance of the hot carrier, the rate-determining step (RDS) transforms from the O* to OOH* formation, reducing the activation energy. This study offers a thorough understanding of the combined contributions of hot carriers and thermal effects to the OER and also opens avenues for enhancing electrochemical efficiency and diminishing techno-economic costs in future applications.

Magnetic composite photocatalyst NiFe₂O₄/ZnIn₂S₄/biochar for efficient removal of antibiotics in water under visible light: Performance, mechanism and pathway

The widespread presence of antibiotics in aquatic environments, resulting from excessive use and accumulation, has raised significant concerns. A NiFe₂O₄/ZnIn₂S₄/Biochar (NFO/ZIS/BC) magnetic nanocomposite was successfully synthesized, demonstrating significantly enhanced electron-hole separation properties. Comprehensive investigations were conducted to evaluate the impact of various parameters, including catalyst mass, pH, and the presence of co-existing ions on the composite's performance. The nanoparticles of NiFe₂O₄ (NFO) and ZnIn₂S₄ (ZIS) were found to improve the surface stability and sulfamethoxazole removal capabilities of porous biochar, while also demonstrating high total organic carbon removal efficiencies. •O₂⁻ and h⁺ were identified as the predominant reactive oxygen species (ROS) in NFO/ZIS/BC-4 during the degradation process. The degradation outcomes of sulfamethoxazole under natural sunlight and water conditions were consistent with laboratory findings, affirming the robust applicative potential of NFO/ZIS/BC. Density functional theory (DFT) calculations were performed to elucidate the photocatalytic mechanism and identify potential intermediate products. Additionally, the types of heterojunctions present in the system were characterized and discussed. After multiple iterations, NFO/ZIS/BC-4 maintained effective photodegradation capabilities through five cycles. This study presents an effective method for the treatment of antibiotics in aquatic environments, offering significant potential for environmental applications.

Degradation of organic Pollutant by Using of BiVO4-NiFe2O4 Heterostructure Photocatalyst under Visible Light Irradiation: Assessment of Detoxicity Study Using Cirrhinus mrigala.

The current study mainly concentrates on the photocatalytic activity of composite nanomaterial of BiVO4 (BVO), NiFe2O4 (NFO), and BiVO4-NiFe2O4 (BVO-NFO) under visible light. Among these, BVO-NFO composite degrades crystal violet dye within 60 min with a percentage degradation of 95.65% under visible light illumination. The BVO-NFO composite exhibits better photodegradation performance, which can be attributed to the effective light absorption and reduced recombination of the photoexcited charge carriers. Additionally, by applying a magnetic field, the BVO-NFO composite can be magnetically recovered by using the magnet for subsequent recycling. The synthesized composite was characterized using optical techniques like X-ray diffraction, ultraviolet diffuse reflectance spectroscopy, scanning electron microscopy, Brunauer-Emmett-Teller, and energy dispersive X-ray analysis. The effect of dye, before and after degradation, on vital organs of fish species was examined such as fish gill (pulmonary-toxicity), fish liver (hepato-toxicity), fish kidney (renal toxicity), fish brain (neural toxicity), and fish muscle (myopathy). This work offers a clear and practical method for designing a highly crystalline semiconductor photocatalyst for dye degradation and the remediation of industrial wastewater.

Dielectric response of activated carbon decorated NiFe2O4 nanohybrids prepared via self-igniting route

The NiFe2O4 (NFO)/activated carbon (AC = 0 %, 1 %, 1.5 %, 2 %) nanohybrids were prepared via the novel one-step self-igniting method. The X-ray diffraction (XRD) indexed patterns confirmed the formation of spinel single-phase NFO/AC nanohybrids. It was found that the crystallite size was reduced from 21.78 nm to 20.41 nm with the incorporation of AC in the NFO lattice. Moreover, the strain and porosity percentage was also reduced from 5.59 × 10−c to 3.04 × 10−c and 34.79 % to 31.53 % respectively, with the addition of AC in the NFO lattice. The Nyquist plots of impedance revealed that the resistance was primarily restricted by the contribution of grain boundaries. The dielectric properties increased with higher concentrations of AC. Specifically, for a concentration of 2 % AC, the dielectric constant and loss reached maximum value compared to pure NFO. This enhancement in dielectric properties makes it suitable for applications at high frequencies.

Synthesis of magnetic NiFe2O4/rGO heterostructure as potential photocatalyst for a breakdown of malachite green (MG) dye under the visible source of light

The development of reactive radical generators, visible-light active photocatalysts with predictable stability, and efficient activity toward the breakdown of organic pollutant continue to be the primary goals of research in the area of photocatalytic environmental restoration. The present concern to on the development of an efficient heterostructure with a band gap operated on a visible region. The rGO incorporation into spinel material also decreases the agglomeration and provides a large surface area. The efficacy of NiFe2O4 (NF) nanoparticles, which are supported by rGO, as a photocatalyst for the breakdown of malachite green (MG) dye. The incorporation of rGO into NFO was investigated with the band gap property of the fabricated material using Tauc's plot profile. The NF/rGO nanocomposite underwent a reduction in magnetic properties determined through Vibrating Sample Magnetometer (VSM) analysis. However, the coercivity of the nanocomposite experienced a significant increase. When subjected to visible light, the degradation rate of malachite green (MG) dyes with NF/rGO was comparatively faster (93.84 %) than that of NF (64.33 %) and rGO (79.41 %). The cyclic photocatalytic degradation process exhibited notable reusability and stability of the magnetic recycling nanocomposite. The photocatalytic results revealed that the developed nanocomposite acts as a potential photocatalyst and it can also be employed in different applications.

Zinc oxide and nickel ferrite nanocomposite as an efficient photocatalyst for crystal violet dye degradation

In the present study, photocatalytic activity of NiFe2O4/ZnO nanocomposite was studied for the degradation of crystal violet dye. Microwave assisted green synthesis method was used for the synthesis of ZnO nanoparticles (NPs). Sol-gel auto-combustion method was used to synthesize NiFe2O4 (NiF) NPs. NiF/ZnO nanocomposite was synthesized through solid-state reaction method. Structural phase was confirmed through X-ray diffraction studies. ZnO NPs were found in wurtzite hexagonal structure whereas cubic spinel structure was found for NiF. NiF/ZnO nanocomposite was observed in both phases. The crystallite size was found to be 31 ± 1, 18 ± 2 and (95 ± 1)/(98 ± 1) nm, for NiF, ZnO and NiF/ZnO nanocomposite, respectively. The optical band gap was determined through UV–Visible spectroscopy and is found to be 1.67 ± 0.03, 2.70 ± 0.08 and 1.70 ± 0.05 eV for NiF, ZnO and NiF/ZnO nanocomposite, respectively. Infrared study of NiF showed the tetrahedral and octahedral band whereas for ZnO the characteristic band was observed. FESEM micrographs of NiF/ZnO nanocomposite showed the formation of agglomerated spherical particles and very less number of rod-like grains indicating the formation of NiF/ZnO nanocomposite. The photocatalytic activity of NiF, ZnO and NiF/ZnO nanocomposite for the degradation of crystal violet dye was studied. It was found that NiF, ZnO and NiF/ZnO nanocomposite showed 89 %, 90.46 % and 87.21 % degradation rate in 60, 120 and 50 min respectively.

Phase reconfiguration of heterogeneous CoFeS/CoNiS nanoparticles for superior battery-type supercapacitors

Developing advanced battery-type materials with abundant active sites, high conductivity, versatile morphologies, and hierarchically porous structures is crucial for realizing high-quality hybrid supercapacitors. Herein, heterogeneous FeS@NiS is synthesized by cationic Co doping via surface-structure engineering. The density functional theory (DFT) theoretical calculations are firstly performed to predict the advantages of Co dopant by improving the OH− adsorption properties and adjusting electronic structure, benefiting ions/electron transfer. The dynamic surface evolution is further explored which demonstrates that CoFeS@CoNiS could be quickly reconstructed to Ni(Co)Fe2O4 during the charging process, while the unstable structure of the amorphous Ni(Co)Fe2O4 results in partial conversion to Ni/Co/FeOOH at high potentials, which contributes to the more reactive active site and good structural stability. Thus, the free-standing electrode reveals excellent electrochemical performance with a superior capacity (335.6 mA h g−1, 2684 F g−1) at 3 A g−1. Furthermore, the as-fabricated device shows a quality energy density of 78.1 W h kg−1 at a power density of 750 W kg−1 and excellent cycle life of 92.1% capacitance retention after 5000 cycles. This work offers a facile strategy to construct versatile morphological structures using electrochemical activation and holds promising applications in energy-related fields.

Interface-induced dual-pinning mechanism enhances low-frequency electromagnetic wave loss

Improving the absorption of electromagnetic waves at low-frequency bands (2-8 GHz) is crucial for the increasing electromagnetic (EM) pollution brought about by the innovation of the fifth generation (5G) communication technology. However, the poor impedance matching and intrinsic attenuation of material in low-frequency bands hinders the development of low-frequency electromagnetic wave absorbing (EMWA) materials. Here we propose an interface-induced dual-pinning mechanism and establish a magnetoelectric bias interface by constructing bilayer core-shell structures of NiFe2O4 (NFO)@BiFeO3 (BFO)@polypyrrole (PPy). Such heterogeneous interface could induce distinct magnetic pinning of the magnetic moment in the ferromagnetic NFO and dielectric pinning of the dipole rotation in PPy. The establishment of the dual-pinning effect resulted in optimized impedance and enhanced attenuation at low-frequency bands, leading to better EMWA performance. The minimum reflection loss (RLmin) at thickness of 4.43 mm reaches -65.30 dB (the optimal absorption efficiency of 99.99997%), and the effective absorption bandwidth (EAB) can almost cover C-band (4.72 ~ 7.04 GHz) with low filling of 15.0 wt.%. This work proposes a mechanism to optimize low-frequency impedance matching with electromagnetic wave (EMW) loss and pave an avenue for the research of high-performance low-frequency absorbers.

Vacancy-Engineered Nickel Ferrite Forming-Free Low-Voltage Resistive Switches for Neuromorphic Circuits.

Innovations in resistive switching devices constitute a core objective for the development of ultralow-power computing devices. Forming-free resistive switching is a type of resistive switching that eliminates the need for an initial high voltage for the formation of conductive filaments and offers promising opportunities to overcome the limitations of traditional resistive switching devices. Here, we demonstrate mixed charge state oxygen vacancy-engineered electroforming-free resistive switching in NiFe2O4 (NFO) thin films, fabricated as asymmetric Ti/NFO/Pt heterostructures, for the first time. Using pulsed laser deposition in a controlled oxygen atmosphere, we tune the oxygen vacancies together with the cationic valence state in the nickel ferrite phase, with the latter directly affecting the charge state of the oxygen vacancies. The structural integrity and chemical composition of the films are confirmed by X-ray diffraction and hard X-ray photoelectron spectroscopy, respectively. Electrical transport studies reveal that resistive switching characteristics in the films can be significantly altered by tuning the amount and charge state of the oxygen vacancy concentration during the deposition of the films. The resistive switching mechanism is seen to depend upon the migration of both singly and doubly charged oxygen vacancies formed as a result of changes in the nickel valence state and the consequent formation/rupture of conducting filaments in the switching layer. This is supported by the existence of an optimum oxygen vacancy concentration for efficient low-voltage resistive switching, below or above which the switching process is inhibited. Along with the filamentary switching mechanism, the Ti top electrode also enhances the resistive switching performance due to interfacial effects. Time-resolved measurements on the devices display both long- and short-term potentiation in the optimized vacancy-engineered NFO resistive switches, ideal for solid-state synapses achieved in a single system. Our work on correlated oxide forming-free resistive switches holds significant potential for CMOS-compatible low-power, nonvolatile resistive memory and neuromorphic circuits.

Synthesis and characterization of NiFe2 O4 nanoparticles by tartaric acid assisted sol-gel auto-combustion method

Nickel ferrite nanoparticles were synthesized by modified sol-gel auto-combustion method. The final product obtained was annealed at 600 °C. The thermal, structural, morphological, vibrational, optical and magnetic properties were studied using TGA, XRD, SEM, FTIR, UV-DRS and VSM techniques, respectively. The thermo gravimetric analysis shows three step decomposition of residual nitrate and tartrate complexes with a total weight loss of 6.69% below 600 °C. Further, there was no significant weight loss above 600 °C. XRD confirmed the spinel cubic phase with Fd3m space group. The average crystallite size was 14 nm. An agglomerated random morphology with porous flake like microstructure was observed. The vibrational analysis confirmed the presence of Ni-O, Fe-O stretching vibrational modes in the wave number range 400-600 cm−1. Tetrahedral site (kTd) and octahedral site (kOh) force constant values were 2.20×105 and 1.31×105 dynes/cm, respectively. From UV-DRS spectra, the Kubelka-Munk function was used to calculate the optical band gap and it was 1.71 eV. The magnetic saturation, retentivity and coercive field values: Ms = 22.35 emu/gm, Mr = 5.20 emu/gm, Hc = 165 Gauss were obtained from VSM analysis. The calculated magnetic moment value was 1.115 μB. The law of approach to saturation was employed to analyze the VSM data in saturation region. The calculated magneto-crystalline anisotropy constant, K1 value was 0.857×105 erg/cc.

NiFe2O4/CuO heterostructures optical, magnetic and photocatalytic properties: Methylene blue dye degradation under solar light irradiation

A series of NiFe2O4/CuO heterostructures were prepared and their photocatalytic potential was compared with bare NiFe2O4 (NFO) and CuO (CO). The prepared materials were subjected to characterization using a combination of X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), photoluminescence (PL) spectroscopy, and UV–visible (UV–Vis) spectroscopy techniques. Photocatalytic efficiency was studied for removing methylene blue (MB) dye under solar light irradiation. The NiFe2O4/CuO heterostructures demonstrated superior removal of MB dye versus other materials. The decline in PL intensity for heterostructure revealed a low recombination rate of charge carriers. Maximum dye removal over NiFe2O4/CuO heterostructure was achieved for 20 mg/L dye catalyst dose and 20 mg/L dye solution at pH 10. Scavenging studies showed that hydroxyl radicals and electrons played a major role in the degradation of dye. The removal efficiency was 80.01 %, which was reduced to 78.83 % for NiFe2O4/CuO heterostructures after four consecutive cycles, which indicates its high stability under solar light irradiation. The NiFe2O4/CuO heterostructures may find potential applications in water treatment for removing organic dyes under visible light owing to their robust catalytic performance under solar light irradiation.

NiFe2O4 nanoparticles as highly efficient catalyst for oxygen reduction reaction and energy storage in supercapacitor

Nickel ferrite (NiFe2O4) nanostructures (NSs) were synthesized via a low-cost and reproducible co-precipitation method. The as-synthesized material was annealed at different temperatures to investigate electrochemical performances for oxygen reduction reaction (ORR) and energy storage capacity. The X-ray diffraction (XRD) pattern confirmed the cubic structure of NiFe2O4 (NF) NSs. The decreased agglomeration and increased particle size were observed by field effect scanning electron microscopy (FE-SEM) with annealing temperature. The presence of Ni–O and Fe–O bonds at tetrahedral and octahedral sites was confirmed by Fourier transform infrared (FTIR) spectroscopy. The electrochemical analysis studied using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) demonstrated that the NF NSs annealed at 900 °C exhibited impressive electrochemical activity with a specific capacitance of ∼136 F/g, outperforming samples synthesized at lower temperatures. Moreover, the electrode material displayed excellent long-term stability over 3000 cycles for ORR activity. The remarkable electrochemical performance of NF NSs at higher annealing temperatures highlights their potential for future energy storage and conversion devices.

Large-scale NiFe2O4-based cermets prepared by composite extrusion modelling: From high-qualified composite feedstock to dense sintered microstructure

Combining with the advantages from mature technologies of fused deposition modelling and powder injection molding, 3D NiFe2O4-based cermet with weight over 1.3 kg and relative density of 95.8 % were fabricated by composite extrusion modelling using polyoxymethylene-based feedstock. Microstructure and rheological properties of the feedstock, roles of printing parameters on the morphology green samples and related catalytic debinding, sintering properties of cermets were investigated in detail. Uniformly dispersed cermet powders in feedstock were confirmed, due to the good wettability between the powders and binders. The feedstock with high solid loading of 58 vol% exhibited shear-thinning behavior and contained high storage modulus for reliable shape retention. With optimized printing parameters, a high compression ratio (layer height/nozzle diameter) over 2.5 tended to shrink the size of stacking pores, resulting in dense green samples. Catalytic debinding was proved to be defect-free and efficient debinding route, which was successfully used to deal with dense cubic samples with thickness of 30 mm. Sintered samples showed uniform microstructure with interconnected FeCuNi and Ni(Fe)Fe2O4 phases. Except for partial stacking pores in the fracture section, polished cermets exhibited mirror-like surfaces, indicating the good controlling of the final microstructure and performance of 3D cermets.

Capacitive Properties of Ferrimagnetic NiFe2O4-Conductive Polypyrrole Nanocomposites

This investigation addresses increasing interest in advanced composite materials, combining capacitive properties and spontaneous magnetization for energy storage applications in supercapacitors. The capacitive properties of ferrimagnetic NiFe2O4 (NFO) spinel nanoparticles with magnetization of 30 emu g−1 were enhanced using high-energy ball-milling and the use of advanced dispersant, which facilitated charge transfer. NFO electrodes with an active mass of 40 mg cm−2 showed a capacitance of 1.46 F cm−2 in 0.5 M Na2SO4 electrolyte in a negative potential range. The charging mechanism in the negative potential range in Na2SO4 electrolyte was proposed. NFO was combined with conductive polypyrrole polymer for the fabrication of composites. The analysis of the capacitive behavior of the composites using cyclic voltammetry, chronopotentiometry and impedance spectroscopy at different electrode potentials revealed synergy of contributions of NFO and PPy. The highest capacitance of 6.64 F cm−2 was obtained from cyclic voltammetry data. The capacitance, impedance, and magnetic properties can be varied by variation of electrode composition. Composite electrodes are promising for application in anodes of asymmetric magnetic supercapacitors for energy storage and magnetically enhanced capacitive water purification devices.

Facile fabrication of NiFe2O4-FeNi/C heterointerface composites with balanced magnetic-dielectric loss for boosting electromagnetic wave absorption

In the electronic information age, and even in the impending “intelligent era”, electromagnetic wave (EMW) absorbers have inevitably received more and more attention. However, their practical applications are currently limited by a lack of suitable mass-production strategies for high performance EMW absorbers. Herein, we propose a facile strategy for large-scale and controllable preparation of NiFe2O4-FeNi/C (NFO-FN/C) composites with various microstructural features advantageous to enhanced EMW absorption, including core-shell structure, porous structure, hierarchical nano-micro topography, and electromagnetic heterointerfaces. The composites are synthesized through the confinement pyrolysis of the polydopamine (PDA)-coated NiFe2O4 (NFO), and their microstructural features can be facilely tailored by changing the number of PDA confinement. The synthesized composite of NFO-FN/C-2 performs best after two repetitions of PDA confinement throughout the preparation process, with a reflection loss (RLmin) of −68.74 dB at a thickness of 1.61 mm and a broad effective absorption of 6.37 GHz at a thickness of 1.9 mm. This impressive EMW absorption performance is attributed to the synergistic effect of multiple loss mechanisms and excellent impedance matching derived from the tailored microstructural features of our EMW absorbers. This work provides a new perspective on the large-scale preparation of highly efficient EMW absorbing materials.

Hydrothermally synthesized double layered ferrite and its CNTs anchored nanoarchitecture: A novel water splitting electrocatalyst

In this study, NiO, NiFe2O4 (NF), NiFe2O4-LDH, and NiFe2O4-LDH@CNTs electrocatalysts were made using a combination of ultrasonication and hydrothermal methods. Electrocatalysts's structure and crystalline phase were confirmed using X-ray diffraction, while their shape and texture were analyzed using electronic study. Electrochemical investigations, like impedance, linear sweep, and cyclic voltammetry, were used to evaluate the catalysts's electrocatalytic activities. The NF-LDH@CNTs-based electrocatalyst showed superior hydrogen and oxygen evaluation activity than the counterpart electrocatalysts. The NF-LDH@CNTs electrocatalyst had a high electrolytic potential, as its onset potential (1.533 V) and over-potential (303 mV) were low. It was also seen that the nanocomposite had a lower Tafel slope (0.26 V) than other electrocatalysts, which shows that NF-LDH@CNTs are good at transporting electrons. The newly created composite of carbon nanotubes (CNTs) and layered double hydroxides (LDH) presents a cost-effective and effective substitute for metal-based electrocatalysts for hydrogen & oxygen evaluation.

Co2MnO4/Ce0.8Tb0.2O2−δ Dual-Phase Membrane Material with High CO2 Stability and Enhanced Oxygen Transport for Oxycombustion Processes

Co₂MnO₄/Ce_0.8Tb_0.2O_2−δ Dual-Phase Membrane Material with High CO₂ Stability and Enhanced Oxygen Transport for Oxycombustion Processes