Abstract: The method for fabricating an asymmetric solid-state device (ASSD), comprising synthesizing an SrO//CdO composite thin film on a conductive substrate to form a positive electrode; providing an activated carbon negative electrode; preparing a gel electrolyte consisting of 1M Polyvinyl Alcohol-Potassium Hydroxide (PVA-KOH) composition for use between the positive and negative electrodes; stacking the SrO/CdO positive electrode, the 1M PVA-KOH gel electrolyte, and the AC negative electrode in a multi-layer arrangement; and pressing the stacked layers together to form the asymmetric solid-state device (ASSD). The asymmetric solid-state device, comprising a positive electrode comprising a SrO thin film and a CdO thin film on a conductive substrate; a negative electrode comprising activated carbon (AC); and a 1M PVA-KOH gel electrolyte positioned between the positive and negative electrodes, wherein the device is formed by stacking the components in layers and pressing them together.

Abstract: The present invention generally relates to a process of fabricating an asymmetric supercapacitors device comprising synthesizing a BaO and CeO2 thin film as a first electrode using a one-step successive ionic layer adsorption and reaction (SILAR) method for uniform deposition and adhesion on a conductive substrate; synthesizing an activated carbon (AC) electrode as a second electrode; formulating a solid-state electrolyte layer comprising polyvinyl alcohol (PVA) and potassium hydroxide (KOH), wherein the solid-state electrolyte layer is formed as a gel; assembling the device by layering the first electrode, the solid-state electrolyte layer, and the second electrode in a stacked configuration, wherein the assembled device is allowed to stabilize for a period of 12-24 hours at room temperature to ensure uniform distribution of the electrolyte and structural integrity; and pressing the assembled layers together to enhance contact between electrodes and the electrolyte.

Abstract: The method for synthesizing ZnO//CuO nanocomposites for dual-mode supercapacitor devices. The method comprises preparing a precursor solution by dissolving Zn(NO3)2·6H2O and Cu(NO3)2·3H2O in 100 milliliters of sterile double-distilled water; separately adding 5 milliliters of a plant extract and the 50 milliliters of precursor solution dropwise into a reaction flask under stirring at 100-120 rpm to form a mixture and a precipitate; centrifuging the mixture to separate the precipitate from the supernatant; drying the separated precipitate in a hot air oven at approximately 323 K until fully dehydrated; calcining the dried precipitate to obtain the ZnO//CuO nanocomposite and fabricating a symmetric supercapacitor device using ZnO//CuO nanocomposite electrodes, a filter paper separator and PVA-KOH gel electrolyte and an asymmetric supercapacitor device using an activated carbon electrode, a ZnO//CuO nanocomposite electrode, a filter paper separator and PVA-KOH gel electrolyte that exhibits a Cs of 819.

Abstract: The present invention relates to a process for synthesizing copper-supported cobalt-doped bismuth oxide nanomaterial electrode for supercapacitor applications. For the synthesis of said nanomaterial electrode, Successive Ionic Layer Adsorption and Reaction (SILAR) technique is used. The present invention carried out the maticulous fabrication of copper-supported cobalt doped Bi2O3 nanomaterial electrode, wherein the synthesized nanomaterial electrode, harnesses the unique properties of each constituent material to achieve superior electrochemical performance. Through precise control of SILAR parameters, including deposition cycles and solution concentrations, a finely tuned composite material is produced, characterized by enhanced conductivity, stability, and specific capacitance. The strategic incorporation of copper and cobalt doping within the Bi2O3 matrix synergistically enhances the overall electrochemical behavior, facilitating efficient charge transfer and storage.

Abstract: The present invention relates to a method for synthesizing dysprosium-doped cobalt-chromate for supercapacitor applications and a composition for the same, wherein an efficient and cost-effective Solution Combustion synthesis method is utilized for the preparation of Dy-doped CoCr2O4 (CCD). The stoichiometric dissolution of metal and rare earth nitrates, along with fuels, in distilled water forms a green-colored solution, subsequently heated to 450 degrees Celsius. The resulting ash undergoes grinding to yield a fine green pigment with a controlled size of 25 nm. Electrochemical properties of CCD are thoroughly examined through cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. Capacitive behavior, evaluated via various techniques, demonstrates an increase in capacitance with Dy3+ concentration. Density of states calculations reveal improved electronic features after Dy3+ doping, emphasizing enhanced charge storage capabilities.

Abstract: The present invention generally relates to a water purification device designed to operate primarily on gravitational force. The device comprises an inlet chamber (102) for storing surface water; and a filtration chamber (104) placed beneath the inlet chamber housing: a first filter made up of a 1:3 mixture of zeolite and acid-fractionalized activated charcoal, supported on a cotton bed; a second filter (104B) consisting of powdered eggshell membrane mixed with zeolite and Fe3O4 nanoparticles in a 5:3:1 ratio; and a third filter (104C) composed of a mixture of eggshell membrane powder, zeolite, Fe3O4, and AgNO3 nanoparticles, all supported on a cotton bed in a 5:3:1:1 ratio; and an outlet (106) adjusted at a bottom section for collecting purified water. The surface water enters from a top of the filtration chamber and is subjected to gravitational force, leading it through the series of filters towards the outlet.