Thermally Driven High-Rate Intercalated Pseudocapacitance of Flower-like Architecture of Ultrathin Few Layered δ-MnO₂ Nanosheets on Carbon Nano-Onions

Abstract

The layered two-dimensional (L2D) nanostructures are greatly favorable electrode materials in electrochemical energy storage as a consequence of enhanced specific surface area and effective intercalation of ions. However, the realizations of uniform L2D structure with appropriate van der Waals gap and its threedimensional architecture of a few-layered association enhance the accommodation of ions for superior supercapacitor. Temperature driven boost in the storage by compensating minor life span is highly noteworthy. Herein, we report a fascinating 3D architecture composed of L2D δ-MnO 2 nanosheets decorated on carbon nanoonion (CNO) by a cost-effective, template-free, low-temperature chemical route. The temperature-driven electrochemical kinematics exhibits efficient charge storage capacity via intercalated pseudocapacitance. The specific capacitance was boosted from 147 F•g −1 to 321 F•g −1 with increasing temperature from 4 to 70 °C at 2 mV•s −1 . Nevertheless, merely 25% stability retention has been forfeited up to 6000 cycles at high current density (5 A•g −1 ). Furthermore, the flexible asymmetric device (FAD) demonstrates a high operating voltage of 1.8 V and superior bendability via retention of 97% capacitance with the bending angles from 0°to 180°. The superior energy density of 49.5 Wh kg −1 and excellent stability of 89% up to 10 000 cycles are figures of merit of L2D δ-MnO 2 nanosheets decorated on carbon nano-onion (CNO) electrode candidate for next-generation wearable energy storage devices.

Ultrathin cobalt phosphate enfolded with biomass-derived multishelled carbon onion as a proficient electrocatalyst for the oxygen evolution reaction and its green sustainability assessments

“…6(c)). 66 The thickness of CoP was ∼20 nm. The interconnected porous with a free flow of delocalized electrons in the multi-shelled graphitic structure with cobalt phosphate could synergistically enhance the electrochemical reaction and highly favours improving the surface oxygen vacancies, water adsorption, dissociation, and OER stability.…”

Assembling a high-performance asymmetric supercapacitor based on pseudocapacitive S-doped VSe2/CNT hybrid and 2D borocarbonitride nanosheets

“…13,14 The nanocarbon additives, such as carbon nanotubes (CNTs) and graphene, enhance the energy storage performance of VSe 2 along with providing excellent structural and electrochemical stability. 15–18 However, the energy storage performance of VSe 2 -based electrodes is still far below the theoretically predicted values. Doping of TMDs with non-metal, such as sulphur, is also a reported strategy to enhance energy storage performance.…”

Heteroatom Doping in Pollutant Diesel Soot-Derived Nanocarbon for Enhanced Zn-Ion Storage Performance

“…ONCs comprise sp 2 -hybridized graphitic layers along with the presence of sp 3 -hybridized carbons forming the circular layers . Owing to the presence of exo- and endohedral apertures on ONCs high specific surface area, , these ONCs are used as a potential candidate for electrode materials in electrochemical energy storage systems (EESS). , As per available literatures, there are few reports on DS and DS-based composites to fabricate EESS. For instance, Singh et al used the DS for supercapacitor application in aqueous and nonaqueous electrolytes .…”