2D Layered α‐Fe₂O₃/rGO Flexible Electrode Prepared through Colloidal Electrostatic Self‐Assembly

Abstract

Via simple hydrolysis of FeCl 3 in the boiling water, Fe(OH) 3 colloidal nanoparticles (NPs) exhibit highly positively charged. Graphene oxide (GO) nanosheets show negatively charged when dispersed in water. Inspired by this two fascinating characteristics, 2D layered α-Fe 2 O 3 /rGO hybrid film (FGHF) was fabricated through a facile colloidal electrostatic self-assembly with subsequent vacuum filtration and hydrothermal reduction. In this hybrid film, cubical α-Fe 2 O 3 NPs are well-distributed on rGO sheets, which can provide sufficient active interfacial sites and effectively alleviate the volume variation of α-Fe 2 O 3 NPs during the electrochemical reactions. The as-obtained FGHF exhibits a high specific capacitance of 714 F g -1 and an outstanding rate capability of 42.6% retention at 30 A g -1. Moreover, a flexible supercapacitor was fabricated, which can achieve a high volumetric capacitance of 16.45 F cm -3 , leading to a energy density of 1.46 mWh cm -3 and a power density of 199.8 mW cm -3. The flexible nature of FGHF allows the as-fabricated supercapacitor remained undamaged and almost no change in capacitive performance under bending up to 180 degree.

Partially Graphitized Iron-Carbon Hybrid Composite as Electrochemical Supercapacitor Material

“…[26] The specific capacitance for CF10 calculated from GCD is 878.0, 868.3, 863.1, 836.8 and 800 F/g at current densities of 5, 6, 7, 8 and 9 A/g respectively which is higher than CF0 and CF20 with Csp of 25.7 F/g and 381.6 F/g at 5 A/g (Table S3) respectively. The Csp of CF10 is higher than the reported results for Fe3O4@hollow graphite shells (481 F/g, 1 A/g), [27] α-Fe2O3/rGO flexible electrode (714 F/g, 1 A/g), [28] Fe3O4/rGO nanosheets hybrid (455 F/g, 3.6 A/g), [29] and rGO/Fe2O3 composite (577.5 F/g, 2 A/g) [30] . Figure 4d and 4e represent the specific capacitance as a function of scan rate and current density respectively.…”

Simultaneous enhanced electrochemical and photoelectrochemical properties of α-Fe2O3/graphene by hydrogen annealing

“…As shown in figure 2(d), the typical type-IV isotherm of GFC4 indicates the presence of mesoporous structures. The BET specific surface area of GFC4 is larger than Fe 2 O 3 powder values in the references [46,58,59]. This result demonstrates the advantages of the present rGO decorated route to produce large accessible surface area and prevent the restacking of graphene sheets.…”

Preparation of stable and superior flux GO/LDH/PDA‐based nanofiltration membranes through electrostatic self‐assembly for dye purification

“…As to the GO/LDH self‐assembled hybrids (Figure C and D), the typical semitransparent wrinkled surface of GO can be observed, and the positively charged LDH nanoplates anchored on the negatively charged surface of GO in the form of aggregates, which were attached together firmly. This result is attributed to the electrostatic interaction between GO and LDH . Further, the difference in LDH agglomerate size can be ascribed to the nonuniform distribution of negative charges on GO surface.…”