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The impediments confronted by flexible batteries for fabrication methodologies and lower specific power for real-time applications ameliorate the stand of flexible supercapacitors as a novel impartial executor in the storage of energy. The commendable attributes of specific energy, long-cycle stability, and rapid ion transport make supercapacitors a crucial candidate in the devices of storage of energy. Eying on these recompenses of supercapacitors, Ni4CuO5-mw-CNT and rGO-FeVO3are fabricated for higher energy asymmetric solid-state supercapacitors through a facile solvothermal procedure delineated. The typical morphology of bimetallic oxides with crystallinity variation depicts a high surface area that grossly supersedes the sites of redox-active, which influences the diffusion of electrolyte ions and the variable-valence redox reaction with ion embolism. The synthesized oxide is investigated using X-ray diffraction, X-ray photoelectron, and Raman spectroscopy to affirm the phase and inspected by electron microscopy for structural features with BET. The Hirshfeld surface simulation analysis assists in grasping the electronic interaction to explicate the experimental consequences. An asymmetric supercapacitor (ASC) device comprising Ni4CuO5-mw-CNT as a cathode and rGO-FeVO3as an anode is assembled. The electrochemical response of Ni4CuO5-mw-CNT and rGO-FeVO3electrodes exhibits higher specific capacitances of ∼778.8 and ∼478 F/g at a current density of 0.4 A/g, respectively, superior long-cycle stabilities, and rate capabilities. Moreover, the convened ASC device achieves a maximum specific energy of ∼29.2 Wh/kg and a specific power density of ∼3201.6 W/kg, along with a retention of the capacitance of ∼82.6% after 10,000 cycles. The associated porous morphology network affords instantaneous accessibility of the electrolytic ions that utterly revamp the proficiency of the electrodes in the field of energy storage.

Integrating an energy harvester and energy storage into a single unit, without connecting any external source, has gathered substantial attention for its ability to convert and store energy in a single device. This study introduces an innovative, self-sustaining power cell called the self-power supercapacitor (SPSC). The SPSC consists of two triboelectric nanogenerators (TENG) and a carbon based supercapacitor cell sandwiched between two TENGs. The SPSC utilizes the energy produced by two TENGs and stores it directly in the supercapacitor, bypassing the requirement of power management circuits. This energy storage process is achieved using tribo-electrochemical methodology. The supercapacitor consists of activated porous carbon obtained from natural biowaste, infused with an ionic liquid electrolyte gel. Each TENG is constructed using a blend of naturally abundant Silk with PVA and PVDF as triboelectric components and exhibit a maximum voltage of 800 V with an instantaneous output power density of 598 mW/cm2. In addition, the self-power supercapacitor effectively gets charged to a voltage of 0.8 V after continuous tapping of 100 s Due to the huge active surface area of the activated carbon electrodes, the device attains a specific capacitance of 43.75 mF/cm2. The assessed specific energy and specific power of the assembled SPSC device were 3.89 mWh/cm2and 666.67 mW/cm2, respectively when subjected to tapping operations. The self-power supercapacitor cell also has the ability to power a range of portable electronics, such as LED. This research evidences the competence of charging the supercapacitor of SPSC system using TENGs without the need for an external parameter.

Background: Nowadays, microbial infections are considered the most important causes of morbidity and mortality. Various microorganisms including biofilm-forming bacteria reported playing a crucial role in such public health concerns. On the other hand, the inefficacy of conventional antimicrobial agents due to various reasons including drug resistance creates a need for the development of effective drug molecules. In this context, nanoparticles can be promisingly used in the management of all such concerns. Objective: The study aimed to evaluate antibacterial and biofilm removal efficacy of various metal nanoparticles against biofilm-forming bacteria. Methods: Various metal nanoparticles including silver (AgNPs), copper (CuNPs) and zinc oxide (ZnONPs) were synthesized from plant leaf extracts of Punica granatum, Citrus medica, and Annona squamosa, respectively. Results: Thus synthesized nanoparticles were evaluated for their antibacterial and biofilm removal efficacies against Enterococcus gallinarum, Staphylococcus haemolyticus, Enterobacter aerogenes, and Salmonella enterica serovar Typhi to propose a promising approach towards management of such pathogens. In vitro antibacterial study demonstrated that AgNPs showed the maximum efficacy against all the test bacteria followed by CuNPs and ZnONPs. Conclusion: Our results indicate that the metal nanoparticles can be effectively used for the removal of biofilm and also as antimicrobial agents for the management of microbial pathogens responsible for dreadful infections.

A mammoth effort has been levied to alleviate the specific energy of supercapacitors and the asymmetric cell formation that delineates a broader potential window. The α-Fe2O3is a potential candidate for the negative electrode in supercapacitor storage for possessing widespread operating potential, economic, higher redox activity, and eco-friendliness. The significance of the synergistic effects compared on the supercapacitive responses in accordance to the specific energy, specific capacitance, specific power, long cycle stability, and rate capability are emphasized along with the cathodic vanadium oxide PANI CNT composite. The flakes fashioned vanadium dioxide (V2O5) with the assimilation of mw-CNT and polyaniline (PANI) originate by a facile synthesis methodology to antagonize the barrier possessed by vanadium-based oxides in the advancement of supercapacitor. As a result of mw-CNT and PANI integration with V2O5, the established organic-inorganic electrode depicts a higher specific capacitance. Those iron and vanadium oxide composite delineates specific energy of ∼78.72 Wh kg−1and ∼49.31 Wh kg−1, along with retention of the capacitance of ∼91.1% and ∼80.9% each after 10,000 cycles. These inimitable amalgam systems of the combination of inorganic-organic can accomplish the compulsion for the growth of novel functional materials for the applications of energy storage.

The dual metal oxides anticipated prospective substitution of the transition of cathodic energy materials. The prominent attributes like higher specific energy, specific power, and long cycle stability are crucial to a supercapacitor device's energy storage. In this acclaimed research, the novel MnV2O7composite is fabricated by microwave process and tailed by a hydrothermal method where dimethyl formamide, ethylene glycol, and water are used as solvents separately. The bimetallic oxide's distinctive morphology with crystallinity variation realizes by the solvent. It delineates a higher active surface area that grossly supersedes redox-active sites, which eases diffusion of electrolyte ions and multi-valence redox reaction with ions intercalation. The lignocellulosic bio-waste-derived activated carbon materials are worked as anodic material. The synthesized oxide is investigated using diversified characterization tools to confirm the phase formation and investigated by electron microscopy for structural characteristics. The Hirshfeld surface, EPR and theoretical generalized gradient approximations simulation assist in comprehending the electronic interaction to elucidate the experimental consequences. The MnV2O7oxide depicts improved capacitance is 402 Fg−1at 2 mVs−1scan rate and 364 Fg−1at 2 mAcm−2current for dimethyl formamide as solvent compared to rest. Also, composites delineate 96 % long cycle stability up to 10,000 cycles at 40mAcm−2current with a maximum specific energy of 51.8 Whkg−1and specific power of 2500 Wkg−1. The integration of augmented energy storage of the composite leads to a perfect candidate to apprehend the urge of novel advanced materials engineering for applications of energy storage.

•Synthesis of activated porous carbon from bio waste.•Symmetric super capacitor based on the activated porous carbon attributes excellent electrochemical performance.•The symmetric super capacitor device and the carbon itself evinced excellent long cycle stability and high cell voltage.•High specific energy and specific power are realized in super capacitor analysis.•The system potential is calculated by utilizing the upper limit of the capacitive potential value.