CoFe₂O₄ Nanoparticle Decorated Hierarchical Biomass Derived Porous Carbon Based Nanocomposites for High-Performance All-Solid-State Flexible Asymmetric Supercapacitor Devices

Abstract

In this modern era of electronics possessing features like advanced compactness and wearability, flexible all-solid-state supercapacitor devices constructed by using biomass-derived materials are considered as suitable aspirants by virtue of their high energy density, power density, and good cyclic life. Herein, we have constructed a high-performance all-solid-state flexible asymmetric supercapacitor device using coconut fiber derived porous carbon as the anode and a nanocomposite composed of CoFe 2 O 4 nanoparticles (CF) immobilized within the pores of porous carbon (PC) as the cathode. The constructed device possessed a high energy density of 50.34 W h kg −1 at a power density of 1450 W kg −1 and good cycle life (retention of ∼91% specific capacitance (C S ) after ∼5000 cycles). The fabricated device retained its performance even after considerable physical deformation. These excellent features of this device can be credited to the synergy between the CF and PC nanomaterials. CF nanoparticles provide fast redox processes and good power delivery within a few seconds of time, whereas the high surface area (BET surface area ∼1323 m 2 g −1 ) porous carbon possessing structural porosity hosts the CF nanoparticles and also helps in faster ion transfer in the nanocomposite and provides mechanical robustness to the electrode. The results obtained from the present work encourage the augmentation of low-cost electrode material for highly efficient green energy-based electrochemical energy storage (EES) devices.

CoFe2O4 Hollow Spheres-Decorated Three-Dimensional rGO Sponge for Highly Efficient Electrochemical Charge Storage Devices

“…The N 2 adsorption–desorption isotherm of 80CF hs -20rGO sp ( Figure S5 ) clearly depicts a type IV isotherm with an H3 hysteresis loop indicating the presence of a pore network consisting of meso- and macropores in it. 37 , 38 …”

A high-performance flexible energy storage device from biomass-derived porous carbon supported MnCo2O4 nanorods and MnO2 nanoscales

“…32 PC exhibited a very high BET surface area of $1300 m 2 g À1 with a total pore volume of $0.75 cm 3 g À1 and cumulative pore surface area of $433.7 m 2 g À1 which were decreased to $404 m 2 g À1 , $0.28 cm 3 g À1 and $117.3 m 2 g À1 in case of the MCO-MnO 2 -PC nanocomposite due to the presence of MCO and MnO 2 in the pores of PC. 22 The chemical states of the elements of the MCO-MnO 2 -PC nanocomposite were analyzed using X-ray photoelectron spectroscopy (XPS) and the obtained XPS survey spectrum is presented in Fig. S6 † which displays the characteristic peaks of C 1s, O 1s, Mn 2p and Co 2p.…”

“…Besides, it acts as a strong solid support which prevents the agglomeration of the anchored materials as well as making the electrode mechanically more exible. 21,22 Herein, we report a exible all-solid-state ASC device made from low-cost and environment-friendly electrode materials which is capable of providing preeminent electrochemical performances for a long period of time. MCO-MnO 2 -PC was used as the cathode material that was prepared from low-cost and abundantly available and non-toxic chemicals and biomass-derived PC.…”

CoFe2O4 Nanoparticles Grown within Porous Al2O3 and Immobilized on Graphene Nanosheets: A Hierarchical Nanocomposite for Broadband Microwave Absorption

“… 31 , 38 As shown in Figure 3 e, the O 1s peak curve was deconvoluted to two peaks at 530.0 and 531.5 eV, which arises due to the lattice M–O (M=Co 2+ , Fe 3+ , Al 3+ ) bonds and oxygen-containing functional groups, respectively. 31 , 39…”

“… 36 The curve fitting of the Co 2p peak showed two peaks at 780.9 and 796.6 eV that represents the spin–orbit splitting of Co 2p 3/2 and Co 2p 1/2 , respectively, and their satellite peaks (sat) were observed at 785.7 and 802.9 eV, respectively ( Figure 3 c). 31 , 37 The deconvoluted Fe 2p spectrum is presented in Figure 3 d, and the peaks at 710.9 and 724.3 eV were credited to Fe 2p 3/2 and Fe 2p 1/2 of Fe 3+ in the octahedral sites, and two peaks at 712.8 and 726.0 eV were attributed to Fe 2p 3/2 and Fe 2p 1/2 of Fe 3+ in the tetrahedral sites, respectively, whereas the satellite peaks were observed at 718.1 and 733.1 eV. 31 , 38 As shown in Figure 3 e, the O 1s peak curve was deconvoluted to two peaks at 530.0 and 531.5 eV, which arises due to the lattice M–O (M=Co 2+ , Fe 3+ , Al 3+ ) bonds and oxygen-containing functional groups, respectively.…”