As society moves towards a low-carbon future, the global emphasis on efficient and sustainable energy storage platforms increases and has intensified the search for advanced electrode materials that offer high capacitance, fast charge-discharge capability, and long-term cycling stability. However, most conventional materials suffer from limited electrical conductivity, poor rate performance, or structural degradation over extended cycling. To address these limitations, a novel composite electrode material based on a Pb-based MOF (YK-2) and functionalized carbon nanotubes (FCNTs) was developed and systematically studied. A series of composites, YK-2@FCNT(5), YK-2@FCNT(10), and YK-2@FCNT(15), were successfully synthesized and thoroughly investigated by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) in a three-electrode system. Among them, YK-2@FCNT(10) demonstrated the highest specific capacitance of 913.57 F g-1 at 0.5 A g-1, significantly outperforming the pristine YK-2 electrode. EIS analysis revealed a marked reduction in both solution and charge transfer resistance due to the incorporation of FCNTs, enhancing conductivity and ion diffusion. Dunn's method further confirmed a mixed charge storage mechanism with a b-value of 0.747, where the proportion of capacitive contribution rose significantly from 32.02% to 65.33% as the scan rate increased from 5 to 80 mV s-1. Additionally, YK-2@FCNT(10) retained 92.87% of its initial capacitance even after 5000 consecutive charge-discharge cycles at 10 A g-1, indicating excellent long-term electrochemical stability. Furthermore, a symmetrical supercapacitor device assembled using YK-2@FCNT(10) electrodes delivered a high specific capacitance of 216.9 F g-1 at 0.5 A g-1 and maintained an excellent cycling stability of 86.67% over 5000 cycles. The device also achieved a remarkable energy density of 30.12 Wh kg-1 and a maximum power density of 4998.69 W kg-1, confirming its strong potential for practical high-performance energy storage applications.
There has been increasing world interest in evaluating nanoparticle-infused PMMA/PLA nanocomposite films, as they are suitable for multifunctional applications. In this research work, we emphasize the design of nanocomposite films based on a PMMA/PLA blend with different high loadings of Zn0.5Co0.5Fe2O4 nanoparticles (ZCFO NPs), based on the solution-casting method. Various techniques were used to evaluate the different properties of the obtained films. The interaction and complexation of the polymer blend with the nanofillers were evidenced by X-ray diffraction and Fourier transform infrared spectroscopy. The optical properties of the composites were found to be dependent on the amount of nanoparticles; that is, direct and indirect optical band gaps reduced as ZCFO increased to 8 % by weight. Furthermore, the Urbach energy increased with the addition of biochar due to the addition of more energy traps in the blend, allowing lower energy transitions. Electrical characterizations and dielectric properties were examined in all the samples, with increased AC conductivity and dielectric behavior with increasing frequency and nanofiller weight. Of all the formulation compositions, PMMA/PLA-6 %ZCFO showed the best performance. Notably, when compared to the pristine blend, the energy density significantly increased with the addition of 6 wt percent ZCFO nanoparticles. The ZCFO NPs were shown to considerably improve the thermal characteristics of PMMA/PLA using thermogravimetric analysis (TGA). It exhibited better mechanical strength with tensile strength (23.93 MPa) and Young's modulus (14.89 MPa) at 8 wt % nanoparticle loading. With the improvement in structural optical, electric, and dielectric characteristics, this specific composition (PMMA/PLA-6 %ZCFO) is highly eligible to be used for multifunctional applications.
The global energy crisis and ecological issues have fueled the need for advanced energy storage systems, with supercapacitors emerging as the most attractive candidates due to their high-power density and extended lifecycle. Therefore, this research work is mainly focused on fabricating aqueous hybrid supercapacitors using ternary g-C3N4@TiO2/CeO2 nanocomposites, prepared via high-energy ball-milling with various concentration of g-C3N4 (5-15 wt%). As far as the electrochemical performance is concerned, the 10 wt% nanocomposite delivered remarkable specific capacitance (453.32 F/g at 3 mV/s; 550.27 F/g at 1 A/g) with extended discharge time (similar to 600 s). Moreover, an asymmetric supercapacitor device was assembled with activated carbon as the negative electrode, whereas the 10 wt% nanocomposite material was used as the positive electrode. The assembled device exhibited the outstanding energy and power densities of 67.3 Wh/kg and 8800 W/kg, respectively. Similarly, the long-term stability tests demonstrated 95 % capacitance retention after 3000 cycles with 98 % Coulombic efficiency. Furthermore, the kinetic analysis revealed a transition from diffusion-controlled (55 %) to capacitive-controlled (89 %) processes with increasing scan rates. The exceptional performance stems from g-C3N4 networks integrated into pseudocapacitive metal oxides, creating hierarchical structures that optimize electron/ion diffusion. Hence, this work provides an effective strategy for developing high-performance ternary nanocomposites for next-generation energy storage applications.
Safranin O dye threatens human health and aquatic systems through persistent color and cellular toxicity. Its presence in water lowers light transmission and suppresses primary production. Novel MgO/BaCO3/CaCO3/Ca(OH)2 nanocomposites were synthesized by a facile Pechini sol-gel route at two set temperatures (600 and 800 °C) and are denoted BMC600 and BMC800, respectively. XRD confirms multiphase products with an average crystal size of 60.52 nm regarding BMC600 and 68.64 nm regarding BMC800. EDX detects C, O, Mg, Ca, and Ba with atomic percentages for BMC600 equal to 13.2, 57.8, 12.0, 12.7, and 4.3
Over the past few decades, the profile of liver diseases in Africa and the Middle East has undergone significant changes. The incidence of metabolic dysfunction-associated fatty liver disease (MAFLD) has risen to alarming levels. Despite the seriousness of the situation, there is a scarcity of local or regional guidelines established to address it. This document presents the clinical practice guidelines from the African Middle East Association of Gastroenterology (AMAGE) related to the screening, diagnosis, and management of MAFLD. It addresses multiple aspects of managing this condition while taking into account local circumstances and the healthcare system's management requirements. These guidelines are intended for routine clinical use, with a specific focus on particular groups when needed.
