Perovskite rare earth porous hollow microspheres of SmFeO3/MWCNT battery type asymmetric hybrid supercapacitors

The rapid advancements made by science and technology in the present world are astonishing and have a way of stimulating our imagination. Modern research centres on search for unique cathode electrodes to improve energy density in hybrid supercapacitors (HSCs). A battery-type perovskite rare earth-based SmFeO3/MWCNT electrode is being investigated as cathode electrode for future-generation energy storage devices. Herein, perovskite rare earth-based metal oxides and its carbon composites (SmFeO3, SmFeO3/GC,SmFeO3/MWCNT) are flourishingly synthesized via one-step solvothermal technique as cathode materials for hybrid supercapacitors. The asymmetric solid-state supercapacitor SmFeO3/MWCNT//CNT device is constructed with an excellent 216.68 F/g specific capacitance, 67.71 Wh/kg energy and 749.97 W/kg power density at 1 A/g current density. An improved cycling performance of 79.83% capacity retention and 99.84% coulombic efficiency after 20000 long-cycles is reported. This work revealed that SmFeO3/MWCNT//CNT AHSSCs offer boundless ability as good electrode for practical energy storage applications.This work was supported by MHRD RUSA–Phase 2, UGC-SAP, DST-FIST, and PURSE grants

Unique hierarchical mesoporous SmMnO3/MWCNT for highly efficient energy storage applications

Unique hierarchical mesoporous with hollow nanostructures of rare earth transition metal oxides (RE-TMOs) has obtained significant research notice owing to its surface permeability (hollow interior), bulky surface area, low density, as electrode materials for better search of supercapacitors. Nevertheless, controlling the hallow nanostructures in a simple method is a very challenging one. A unique SmMnO3/MWCNT material as a potential battery-typesupercapacitor electrode material was prepared from a solvothermal method in water/ethanol media. The as prepared SmMnO3/MWCNT electrode delivered 47.13 mAh/g@1A/g specific capacities from the galvanostatic charge discharge (GCD) analysis and delivered 86.22% capacity retention over 5000 cycles. Furthermore, an assembled hybrid supercapacitor (SmMnO3/MWCNT//CNT HSC) displays 255.82 F/g specific capacitance, 79.94 Wh/Kg @ 1 A/g energy density, 14996.39 W/Kg@20 A/g power densities with the decent cycling stability of 79.83% and coulombic efficiency of 99.84%@20000 cycles.This work was supported by MHRD RUSA–Phase 2, UGC-SAP, DST-FIST, and PURSE grants

Quaternary Cu2FeSnS4/PVP/rGO Composite for Supercapacitor Applications

Electrochemical energy storage is a current research area to address energy challenges of the modern world. The Cu2FeSnS4/PVP/rGO-decorated nanocomposite using PVP as the surface ligand was explored in a simple one-step solvothermal route, for studying their electrochemical behavior by designing asymmetric hybrid supercapacitor devices. The full cell three-electrode arrangements delivered 748 C/g (62.36 mA h/g) at 5 mV/s employing CV and 328 F/g (45.55 mA h/g) at 0.5 A/g employing GCD for the Cu2FeSnS4/PVP/rGO electrode. The half-cell two-electrode device can endow with 73 W h/kg and 749 W/kg at 1 A/g energy and power density. Furthermore, two Cu2FeSnS4/PVP/rGO//AC asymmetric devices connected in series for illuminating a commercial red LED more than 1 min were explored. This work focuses the potential use of transition-metal chalcogenide composite and introduces a new material for designing high-performance supercapacitor applications