Anchored Fe₃O₄ Nanoparticles on rGO Nanosheets as High‐Power Negative Electrodes for Aqueous Batteries

Abstract

Fe 3 O 4 nanoparticles were anchored on GO nanosheets and evaluated as negative electrode materials for high-performance aqueous batteries. The prepared samples were characterized by using XRD, Raman spectroscopy, TGA, and TEM. The energystorage behavior of the samples was investigated by testing high-mass-loaded (ca. 8.5 mg · cm À2 ) Fe 3 O 4 ÀrGO electrodes with different electrochemical techniques, including cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy. The nanocomposites showed better electrochemical storage properties than pure Fe 3 O 4 nanoparticles and rGO nanosheets, suggesting superior performance through synergistic effects. Accordingly, the Fe 3 O 4 ÀrGO nanocomposite with an optimized composition of [60 : 40] showed a maximum capacity of 402 C · g À1 (111.6 mA · h · g À1 ) and superior rate capability (ca. 40 % capacity retention with a 20-fold increase in scan rate) compared to the pure oxide. To further evaluate the applicability of the Fe 3 O 4 ÀrGO nanocomposite, aqueous batteries based on the Fe 3 O 4 ÀrGO [60 : 40] nanocomposite as negative electrodes and NiCoMnO 4 as positive electrodes were assembled and examined by using various electrochemical techniques. Fe 3 O 4 ÀrGO//NiCoMnO 4 cells demonstrated a maximum specific energy of 26 Wh · kg À1 and a maximum specific power of 6.8 kW · kg À1 , with a desirable rate capability. All of the obtained results suggest the Fe 3 O 4 ÀrGO nanocomposite as a promising negative electrode material for high-power aqueous batteries.[a] J.

Metal Oxide Wrapped by Reduced Graphene Oxide Nanocomposites as Anode Materials for Lithium-Ion Batteries

“…The partial weight loss of the rGO/Fe 2 O 3 T−5 and rGO/Co 3 O 4 T−5 nanocomposites is <8% in the pre-300 °C temperature range, which is most likely due to the adsorbed water evaporation and the extraction of oxygen-containing functional groups from the surface of the rGO sheets. Furthermore, a considerable weight loss occurred owing to rGO’s disintegration and combustion at temperatures ranging from 450 to 550 °C [ 55 ]. The results indicate that the percentages of Fe 2 O 3 and Co 3 O 4 in the composites rGO/Fe 2 O 3 T−5 and rGO/Co 3 O 4 T−5 are approximately 51.26 wt.…”

Graphene‐functionalised Olivine Lithium Manganese Phosphate Derivatives for High Performance Lithium‐ion Capacitors

“…It can be observed that the R ct value for AC//G‐LMNP LIC is smaller than that of AC//LMNP and AC//LMP LICs, suggesting that the modified nanocomposite electrode showed faster charge transfer kinetics. Moreover, the low frequency line is more vertical in G‐LMNP nanocomposite, showing better capacitive behaviour and lower ionic diffusion resistance due to the addition of graphene which contributed in the enhancement of the electrochemical performance of G‐LMNP nanocomposite [61].…”

Investigation of Cytotoxicity, Apoptosis, and Oxidative Stress Response of Fe3O4-RGO Nanocomposites in Human Liver HepG2 cells

“…Figure 4B depicted that Fe3O4 NPs were tightly anchored on the surface of thin RGO sheets. Isolated Fe3O4 NPs were rarely observed in TEM study, indicating that most of the Fe3O4 NPs were attached on the surface of RGO sheets [33]. Besides, Fe3O4NPs on the surface of RGO may act as spacers to reduce the restacking of RGO sheets and to avoid the reduction of their high surface area [34].…”