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•Bamboo-leaf activated carbon was synthesized by chemical reaction method.•Bamboo-leaf AC is analyzed using various aqueous electrolyte solutions.•AC delivers a high capacity of CP ...290F/g at 1A/g using mixed electrolytes.•Good cyclic stability around 1000 cycles with 93% capacity retention.
Activated carbon (AC) material has been prepared from bamboo-leaf carbonized under high temperature at 500 °C for 2hr. Then, the chemical reaction method was processed on carbon material to activate using KOH solvent as activating agent. XRD and FT-Raman have confirmed the crystal structure and molecule interaction of the prepared activated carbon. The morphology was characterized using FE-SEM (EDS). The novelty of activated carbon was studied by various aqueous electrolyte such as 1 M Na2SO4, 0.5 M KOH and 1 M Na2SO4 + 0.5 M KOH. The activated carbon delivers the high specific capacitance found as 290F/g at 1A/g using mixed electrolyte (1 M Na2SO4 + 0.5 M KOH). In addition, capacity retention was achieved 93% after 1000 cycles at 10A/g. Mixed electrolytes can be used as a promising electrode material for supercapacitors with high power density.
•A novel Metal-organic framework incorporate on NiCo2O4.•NiCo2O4 prepared by low-cost auto combustion method.•Incorporated material prepared by hydrothermal method.•NiCo2O4/MOF-5 deliver a high ...capacity of CV is 557.36F/g at 5 mV/s.•NiCo2O4/MOF-5 deliver a high capacity of CP is 357.69F/g at 1A/g.
In this article, we incorporated the Metal-organic framework (MOF-5) on NiCo2O4. First, we synthesized the Nickel cobaltite nanoparticles by combustion method. Then incorporated the MOF-5 on NiCo2O4 via the hydrothermal method. NiCo2O4/MOF-5 supported more active sites for ion transportation and storage, improving the specific capacitance of electrode materials. Prepared NiCo2O4/MOF-5 electrode exhibit a good specific capacitance of CP curves shown 357.69F/g at 1A/g and CV curves shown 557.50F/g at 5 mV/s. Thus, the as-prepared NiCo2O4/MOF-5 has a definite advantage for supercapacitor electrode materials. Which proven their promising implications in next-generation high-performance supercapacitors.
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•A porous NiO nanocrystal was synthesised by the hydrothermal method.•NiO nanocrystal is analyzed using various aqueous electrolyte solutions.•NiO nanocrystal delivers a high capacity ...of CP is 200 F/g at 1 A/g using 1 M Na2SO4.•Good cyclic stability around 2000 cycles with capacity retention of 91% at 10 A/g.
The electrochemical performance of porous Nickel oxide nanocrystals synthesised by the hydrothermal method is discussed here. In this porous Nickel oxide, crystal structure and morphology were investigated by XRD, FT-Raman, FE-SEM and HR-TEM. The electrochemical performance of porous Nickel oxide electrode examined by various aqueous electrolytes such as 1 M Na2SO4, 0.5 M KOH and 1 M Na2SO4 + 0.5 M KOH solution. The electrode material delivers high specific capacitance found as 200 F/g at 1 A/g using a single aqueous electrolyte 1 M Na2SO4. The porous Nickel oxide nanocrystals electrode performed the long-term good cyclic stability around 2000 cycles with 91% capacity retention. Here, 1 M Na2SO4 electrolyte achieves high capacity among various electrolytes can be considered as promising electrode material for supercapacitor applications.
Metal–organic framework-derived materials are now considered potential next-generation electrode materials for supercapacitors. In this present investigation, Co3O4@MnO2 nanosheets are synthesized ...using ZIF-67, which is used as a sacrificial template through a facile hydrothermal method. The unique vertically grown nanosheets provide an effective pathway for rapidly transporting electrons and ions. As a result, the ZIF-67 derived Co3O4@MnO2-3 electrode material shows a high specific capacitance of 768 C g−1 at 1 A g−1 current density with outstanding cycling stability (86% retention after 5000 cycles) and the porous structure of the material has a good BET surface area of 160.8 m2 g−1. As a hybrid supercapacitor, Co3O4@MnO2-3//activated carbon exhibits a high specific capacitance (82.9 C g−1) and long cycle life (85.5% retention after 5000 cycles). Moreover, a high energy density of 60.17 W h kg−1 and power density of 2674.37 W kg−1 has been achieved. This attractive performance reveals that Co3O4@MnO2 nanosheets could find potential applications as an electrode material for high-performance hybrid supercapacitors.
The versatility of supercapacitors in energy storage applications has garnered much interest. Specifically, to improve the energy density by combining with the outstanding power density in higher ...energy density batteries to appear as supercapattery. Herein, for the first time, we propose a Fe2O3/α-Ni(OH)2 as an electrode for solid-state hybrid supercapattery. We construct ultrathin α-Ni(OH)2 nanosheets coated on MOF-derived Fe2O3 via the chemical bath method. The Fe2O3/α-Ni(OH)2 composite exhibits excellent electrochemical properties, including high specific capacity around 511.5 C/g (930 F/g) at 1 A/g with outstanding cycle stability (88.3%, 10,000th cycles) and the porosity of the material reveals a good surface area of 202 m2/g. The kinetic analysis reveals that Fe2O3@α-Ni(OH)2 exhibits diffusion-controlled faradaic behaviour (51% diffusion-controlled contributions). As a hybrid supercapattery, the Fe2O3@α-Ni(OH)2//Activated carbon exhibits a specific energy density of 44.51 Wh/kg and specific power density of 2465 W/kg and excellent long-term cycling stability (keep over 90.5% of the initial specific capacitance after 4000 cycles). Three prototype hybrid supercapattery devices (Fe2O3@α-Ni(OH)2(+)||Activated carbon(−)) connected in series were used to demonstrate red LED lighting. This study offers a unique approach to constructing high-performance, low-cost, and ecological green energy storage systems.
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Experiments have been performed under laboratory condition to review the mechanical behaviour of the hybrid composites with aluminium matrix A7075 alloy, reinforced with silicon carbide (SiC) and ...Flyash. This has been possible by fabricating the samples through usual stir casting technique. Scanning electron microscopy was used for microstructure analysis. Chemical characterization of both matrix and composites was performed by using EDAX. Density, hardness, tensile and deformation studies were conceded out on both the base alloy and composites. Enhanced hardness and deformed properties were observed for all the composites. Interestingly improved tensile results were obtained for the composites than alloy. Dispersion of (SiC) and Flyash particles in aluminium matrix enhances the hardness of the composites.
Introduction
A large hepatocellular carcinoma (HCC) with macrovascular invasion is generally considered to have poor prognosis due to unfavorable tumor biology andsuch patients are relegated to ...palliative options. This report describes long term survival after surgery in a patient with HCC and tumor thrombus in the rightatrium.
Methods
Case records of the patient, details of follow up visits and surveillance computed tomography scans performed were reviewed. A brief discussion of thesurgical strategy adopted along with outcome of similar cases in literature is presented.
Results
A 60 year old man presented with a HCC in segments 4, 5 with extension of tumor into the middle, left hepatic veins, inferior vena cava and right atrium.Patient underwent extraction of the tumor thrombus from the right atrium under cardiopulmonary bypass along with extended left hepatectomy. He receivedthree cycles of adjuvant chemotherapy with Gemcitabine, Oxaliplatin and Interferon. There was a parietal wall recurrence after 1 year and 10 months whichwas excised. Since then he remains well and is on regular follow up for more than 12 years from his index surgery with no evidence of disease, making himthe longest known survivor with such an advanced presentation.
Conclusion
This is an unusual instance where aggressive resection for HCC with right atrial tumor thrombus has resulted in an exceptionally long survival.
Metal–organic framework-derived materials are now considered potential next-generation electrode materials for supercapacitors. In this present investigation, Co 3 O 4 @MnO 2 nanosheets are ...synthesized using ZIF-67, which is used as a sacrificial template through a facile hydrothermal method. The unique vertically grown nanosheets provide an effective pathway for rapidly transporting electrons and ions. As a result, the ZIF-67 derived Co 3 O 4 @MnO 2 -3 electrode material shows a high specific capacitance of 768 C g −1 at 1 A g −1 current density with outstanding cycling stability (86% retention after 5000 cycles) and the porous structure of the material has a good BET surface area of 160.8 m 2 g −1 . As a hybrid supercapacitor, Co 3 O 4 @MnO 2 -3//activated carbon exhibits a high specific capacitance (82.9 C g −1 ) and long cycle life (85.5% retention after 5000 cycles). Moreover, a high energy density of 60.17 W h kg −1 and power density of 2674.37 W kg −1 has been achieved. This attractive performance reveals that Co 3 O 4 @MnO 2 nanosheets could find potential applications as an electrode material for high-performance hybrid supercapacitors.
Metal-organic frameworks (MOF) have recently emerged as an intriguing template for developing morphologically pre-designed metal oxide nanostructures. MOFs offer excellent control over morphology, ...extremely high porosity and large surface area, which is highly beneficial for supercapacitor electrode applications. We report the synthesis of bimetallic MOF-derived Nickel Manganese oxide for an electrode in supercapacitor by an efficient solvothermal and subsequent calcination route. The physical characterization was carried out by X-ray diffraction (XRD), Scanning electron microscope (SEM), Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Thermogravimetric analysis (TGA) and Bruner-Emmert-Teller (BET). We performed the cyclic voltammetry (CV), chronopotentiometry (CP), and electronic impedance spectroscopy (EIS) test in a 1 M KOH electrolyte to examine the electrochemical characteristics of the prepared samples. NiMn2O4 electrode material revealed high specific capacitance of 1387 F/g at 1 A/g current density and prominent cycle life (80% capacitance retention after 6500 cycles) and the porous structure of the material has a good BET surface area of 84.3 m2/g. Further, we performed spin-polarized ab-initio density functional theory calculations to study the structural, electronic, and magnetic properties of the spinel NiMn2O4 structure. Our calculated results are close to the experimentally determined structural parameters, and the enthalpy of formation confirms the thermodynamical stability of the spinel structure with ΔHF = −1.6 eV/atom. The orbital projected electronic structure is further investigated to understand the contribution of elements near the Fermi region, which paves the way for further understanding of the distribution of electrons at a particular energy interval of our system. The present findings will aid in fabricating the bimetallic MOF-derived metal oxide nanostructures for the next-generation supercapacitors.
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Due to their vast surface area and superior porosity structure, metal-organic frameworks (MOFs) derived materials have recently presented a significant promise for better lithium-ion batteries ...(LIBs). Herein, we synthesised MOF-derived porous NiCo2O4 nanofile arrays from a simple solvothermal technique followed by calcination at 450 °C. The prepared sample was characterized by X-ray diffraction, thermogravimetric, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy and Brunauer-Emmett-Teller. The acquired nanofile array morphology achieved a large specific surface area of 189 m2/g can shorten the Li ions (Li+) transport and enhance the electrochemical performance. As expected, the prepared electrode reveals a discharge-specific capacity of around 1120 mAh/g at a 0.1 C rate. At 2 C rate, the electrode's specific capacity can still reach 210 mAh/g after 100 cycles. The pseudocapacitive nature of NiCo2O4 was determined by kinetic analysis, revealing the diffusion-controlled faradaic behaviour. Our prepared electrode material is considered an attractive option for the anode material in rechargeable Li-ion batteries because it has been proven to have a relatively good specific capacity and cycling stability.
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•The Porous NiCo2O4 nanofile arrays is synthesised by a solvothermal process.•The electrode exhibits a good specific capacity of 1120 mAh/g at 0.1 C rate.•Kinetic analysis reveals the dominant diffusion-controlled process.•The diffusion can be enhanced by surface area, which benefits Li+ transport.