Synthesis of porous carbon embedded with NiCo/CoNiO2 hybrids composites for excellent electromagnetic wave absorption performance.

Two-dimensional nanomaterials for high-efficiency electromagnetic wave absorption: An overview of recent advances and prospects

Covalently bonded polyaniline/graphene composites as high-performance electromagnetic (EM) wave absorption materials Part A Applied science and manufacturing

Cd0.9Co0.1S nanostructures concentration study on the structural and optical properties of SWCNTs/PVA blend

A hierarchical micro flower structure NiCo2O4/GN/Fe3O4 composite was prepared with a two-step method. Then Fe3O4 nanoparticles were dressed up on petals of NiCo2O4/GN/Fe3O4 composite. It was successfully detected by instruments to analysis crystal texture, surface elements, micro morphology, magnetic properties and weight loss. Results showed that good synergistic effect of dielectric loss and magnetic loss of NiCo2O4/GN and Fe3O4 led to superior EM wave absorption. The minimum RL was − 38.18 dB at 10.6 GHz and effective absorption bandwidth < − 10 dB was reached 2.7 GHz (8.5–11.2 GHz) with the thickness 2.5 mm. The enhancement of EM wave absorption was attributed to the dielectric loss, magnetic loss, interfacial polarization, effective impedance matching and multiple scattering. Thus, the NiCo2O4/GN/Fe3O4 composite was a promising and developable material in EM wave absorption fields.

Synthesis of multilayered micro flower NiCo 2 O 4 /GN/Fe 3 O 4 composite for enhanced electromagnetic microwave (EM) absorption performance

In this paper, the Co/CoO composite was prepared via polyol reduction method, and the Co/CoO was wrapped by reduced graphene oxide (RGO) synthesized with Hummers’ method. The crystal texture, element composition, micromorphology, magnetic properties, and electromagnetic absorption performance of the composite were tested. Compared with the single RGO or Co/CoO, the electromagnetic absorption performance of the Co/CoO@RGO composite has been greatly improved. The RLmin (minimum reflection loss) is − 56.56 dB, the effective absorption bandwidth (RL ≤ − 10 dB) is 5.86 GHz when the ratio of the compound to the paraffin is 1:1, and the thickness is 1.9 mm. The absorption properties of the Co/CoO@RGO composite are excellent, partly due to the synergistic effect of the magnetic and dielectric materials, and partly due to various electromagnetic wave loss mechanisms inside the sample, including the interface polarization between the two materials, Debye relaxation of various substances. Thus, the Co/CoO@RGO composite is a promising material in the field of microwave absorption.

Synthesis of Co/CoO@RGO composite for enhanced electromagnetic microwave absorption performance

Intermetallic compounds are commonly used in semiconductor, shape memory materials, hydrogen storage materials and magnetic materials due to their unique physical and chemical properties. In this study, the FeNi3/rGO (rGO: reduced graphene oxide) composite was prepared by one-step hydrothermal method using water-soluble nickel and iron salts as metal sources and hydrazine hydrate as reducing agent in alkaline solution. The structure of the composites are characterized by XRD, FTIR, XPS and Raman spectroscopy. The micromorphology of the samples is observed by SEM and TEM. The electrochemical performance of the FeNi3/rGO composite is evaluated by electrochemical impedance spectroscopy (EIS), galvanostatic charge–discharge (GCD) and cyclic voltammetry (CV). The results indicate that when the scan rate is 10 mV s−1 in 4 M KOH electrolyte solution, the specific capacitance of the FeNi3/rGO composite is 169.42 F g−1. At a current density of 1 A g−1, the specific capacitance of the FeNi3/rGO composite remains 82.72% of the original energy after 3000 cycles. Therefore, the FeNi3/rGO composite has excellent capacitance performance and is expected to be applied in supercapacitors and nanodevices in the future.

One‐step hydrothermal synthesis of the FeNi3/rGO composite for electrochemical supercapacitor

The characteristics of large surface area, high conductivity and mechanical flexibility performances make graphene suitable for high power next-generation energy storage devices. However, it only stores charge through double-layer capacitors, which limits its energy storage mechanism, resulting in a limited specific capacitance of graphene. In this paper, black Ti3+ self-doped nano titanium dioxide rods (TiOxNRs) were introduced into graphene nanosheets to improve capacitor performance. The results manifest that when 20 wt% TiOxNRs were added into the TiOxNRs/rGO composite, the capacitance performance is the best and the specific capacitance value is 149.5 F g−1 at the scanning speed of 40 mV s−1. In addition, the specific capacitance of the electrode prepared with the TiOxNRs/rGO composite still maintains the original 89.57% after 2000 charge–discharge cycles and has a good cycle life at a current density of 1 A g−1. In short, the TiOxNRs/rGO composite is a prospect and potential material for supercapacitor electrodes in the future.

Preparation of Ti3+ self-doped TiOxNRs/rGO composite: application in supercapacitors

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Synthesis of multilayered micro flower NiCo 2 O 4 /GN/Fe 3 O 4 composite for enhanced electromagnetic microwave (EM) absorption performance

Synthesis of Co/CoO@RGO composite for enhanced electromagnetic microwave absorption performance

One‐step hydrothermal synthesis of the FeNi3/rGO composite for electrochemical supercapacitor

Preparation of Ti3+ self-doped TiOxNRs/rGO composite: application in supercapacitors