Aggregation of polyoxometalates (POM) is largely responsible for the reduced performance POM-based energy-storage systems. To address this challenge, here, precise confinement single Keggin-type POM molecule in a porous carbon (PC) unimodal super-micropore (micro-PC) realized. Such single-molecule enables sufficient activity center exposure and maximum electron-transfer from micro-PC to POM, wh...

Micrometer size activated porous carbon spheres doped with nitrogen and sulfur (NSAPC) are synthesized hydrothermally by using saccharose as the precursor l-cysteine doping agent, followed KOH activation. These possess a high specific surface area (SSA) porosity (mainly microporous) suitable for efficient charge storage. Additionally, significantly changes chemistry. When tested electrode mater...

A hybrid energy-storage system (HESS), which fully utilizes the durability of energy-oriented storage devices and rapidity power-oriented devices, is an efficient solution to managing energy power legitimately symmetrically. Hence, research into these systems drawing more attention with substantial findings. battery–supercapacitor (BS-HESS) widely adopted in fields renewable integration, smart-...

Conducting polymers show great promise as supercapacitor materials due to their high theoretical specific capacitance, low cost, toughness, and flexibility. Poor ion mobility, however, can render active material more than a few tens of nanometers from the surface inaccessible for charge storage, limiting performance. Here, we use semi-interpenetrating networks (sIPNs) of a pseudocapacitive poly...

A simple and scalable method has been developed to fabricate nanostructured MnO2-carbon nanotube (CNT)-sponge hybrid electrodes. A novel supercapacitor, henceforth referred to as "sponge supercapacitor", has been fabricated using these hybrid electrodes with remarkable performance. A specific capacitance of 1,230 F/g (based on the mass of MnO2) can be reached. Capacitors based on CNT-sponge sub...

Two different ionic liquid-based biopolymer electrolyte systems were prepared using a solution casting technique. Corn starch and lithium hexafluorophosphate (LiPF₆) were employed as polymer and salt, respectively. Additionally, two different counteranions of ionic liquids, viz. 1-butyl-3-methylimidazolium hexafluorophosphate (BmImPF₆) and 1-butyl-3-methylimidazolium trifluoromethanesulfonate (...

Metal nanowires show promise in a broad range of applications, but many synthesis techniques require complex methodologies. We have developed a method for depositing patterned aluminum nanowires (Al NWs) onto Cu, Ni, and stainless steel substrates using low-pressure decomposition of trimethylamine alane complex. The NWs exhibited an average diameter in the range from 45 to 85 nm, were crystalli...

Very high surface area activated carbons (AC) are synthesized from pine cone petals by a chemical activation process and subsequently evaluated as an electrode material for supercapacitor applications in a nonaqueous medium. The maximum specific surface area of ∼3950 m(2)  g(-1) is noted for the material treated with a 1:5 ratio of KOH to pine cone petals (PCC5), which is much higher than that ...

One-dimensional flexible supercapacitor yarns are of considerable interest for future wearable electronics. The bottleneck in this field is how to develop devices of high energy and power density, by using economically viable materials and scalable fabrication technologies. Here we report a hierarchical graphene-metallic textile composite electrode concept to address this challenge. The hierarc...