Tungsten carbide@graphene nanoflakes: Preparation, characterization and electrochemical activity for capacitive deionization technology Abdullah M. Al-Enizi, R.M. Abdel Hameed, M.M. El-Halwany, Mahmoud Bakrey, Shoyebmohamad F. Shaikh, et al. Journal of Colloid and Interface Science, 2021 In this present work, tungsten carbide (WC) nanoparticles were intercalated between graphene nanoflakes (GNFs) using sonication followed by hydrothermal treatment. Pristine WC, GNFs and a series of WC@GNFs nanomaterials were physically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) and water contact angle measurements. Cyclic voltammetry and electrochemical impedance studies were operated to investigate the electrochemical performance of these nanocomposites as efficient capacitive deionization (CDI) electrodes with improved electrochemical characteristics and specific capacitances in NaCl solution. Among the synthesized nanomaterials, WC@GNFs containing 10% WC displayed appreciable specific capacitance [580.00 F g-1], salt removal efficiency [95.50%], electrosorptive capacity [22.155 mg g-1] and charge efficiency [0.356] values. Accordingly, the measured results in this study indicate that WC@GNFs nanomaterials are suitable electrodes with an easy preparation route for efficient CDI technology.
Synthesis and characterization of WC@GNFs as an efficient supercapacitor electrode material in acidic medium Dalia M. El-Gendy, R.M. Abdel Hameed, Abdullah M. Al-Enizi, Mahmoud Bakrey, Mohd Ubaidullah, et al. Ceramics International, 2020 A two-step route to the preparation of graphene (G) nanoflakes (NFs), designed with tungsten carbide (WC) nanoparticles (WC@GNFs), through microwave irradiation and hydrothermal treatments. A uniform distribution of the WC nanoparticles on the graphene layers was confirmed through scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses. Additionally, X-ray diffraction (XRD) study demonstrated the presence of the characteristic crystal planes of tungsten carbide on those of graphene. An increase in the graphitization degree (G/1D = 4.9) of the WC@GNF nanocomposite was determined by Raman spectroscopy. These highlighted physical properties enabled the application of this nanomaterial, as a supercapacitor electrode in an H2SO4 electrolyte. The cyclic voltammetry (CV) scans indicated that the charging process was controlled by a pseudocapacitive contribution in conjunction with the electrical double-layered features. A specific capacitance, 1009.52 F/g, was estimated, at 1 mV/s, with improved retention of 106% during repeated cycles, at 20 A/g for 2000 cycles to outperform the obtained results for most relevant W-based nanomaterials. Therefore, the method of fabricating WC, proposed in this work, could be a simple method of examining the performance of a series of comparable transition metal carbides toward the technology of supercapacitors technology.
Novel low temperature route to produce CDS/ZNO composite nanofibers as effective photocatalysts Abdullah M. Al-Enizi, M. M. El-Halwany, Mohammed A. Al-Abdrabalnabi, Mahmoud Bakrey, Mohd Ubaidullah, et al. Catalysts, 2020 In this work, CdS/ZnO composite nanofibers (NFs) were prepared by the electrospinning of a sol–gel comprised of poly(caprolactone), zinc acetate dihydrate, cadmium acetate dihydrate, and ammonium sulfide. The electrospun NF mats were calcined under vacuum in an argon (Ar) atmosphere at 200 °C for 1 h. Standard physiochemical analysis techniques demonstrated the formation of the crystalline hexagonal phase of CdS and ZnO. Composite NFs showed good photocatalytic degradation of methylene blue (MB) dye under visible light irradiation compared to their counterparts. CdS nanoparticles, ZnO nanofibers, and composite NFs photodegraded 35.5%, 47.3%, and 90% of the MB dye, respectively, within 100 min. The reaction kinetics of MB photodegradation using the composite NFs followed the pseudo-first-order relation. Owing to their facile preparation and good photodegradation ability, the proposed method can be used to prepare various photocatalysts for wastewater treatment.
Mechanical properties of polypropylene reinforced hemp fiber composite Materials Physics and Mechanics, 2012
Effect of processing parameters and amount of additives on the mechanical properties and wear resistance of copper-based composite International Journal of Mechanical and Mechanics Engineering, 2010
