Carbon decorated octahedral shaped Fe3O4 and α-Fe2O3 magnetic hybrid nanomaterials for next generation supercapacitor applications

Annealing-Assisted Dip-Coating Synthesis of Ultrafine Fe3O4 Nanoparticles/Graphene on Carbon Cloth for Flexible Quasi-Solid-State Symmetric Supercapacitors

“…At high magnification, as shown in Figure d,h, the carbon fiber surface of CC is very clean, with only the existence of ravines, while that of FG-2 is covered with evenly distributed ultrafine Fe 3 O 4 nanoparticles. The size of Fe 3 O 4 nanoparticles is about 10 nm, which is much smaller than the values reported in other literature. − TEM images (Supporting Information Figure S1a,b) of the peeled off coating on FG-2 also indicate that thin graphene layers are densely coated with Fe 3 O 4 nanoparticles with the size of about 10 nm. To ascertain the specific element composition in the measured area, the energy dispersive spectrometry (EDS) pattern of FG-2 was tested.…”

Effects of multiple injections on the efficacy and cytotoxicity of folate-targeted magnetite nanoparticles as theranostic agents for MRI detection and magnetic hyperthermia therapy of tumor cells

“…In the FTIR spectra of the dextran-coated , two absorption bands appeared in the range of 400-900 cm −1 arises from metal-oxygen bonds in the spinel structure of Fe 3 O 4 nanoparticles 41 . The strong band in the range of 500-800 cm −1 could be related to the stretching vibration of the Fe-O bond in tetrahedral sites (ν 1 ), and the small band observed in the range of 400-500 cm −1 is attributed to the vibration mode related to the Fe-O bond in octahedral sites (ν 2 ) 41 . Also, the broad absorption peak at 3408 cm −1 is a distinctive stretching vibration of the hydroxyl groups presented in the dextran.…”

Porous Fe2O3 Nanorods on Hierarchical Porous Biomass Carbon as Advanced Anode for High-Energy-Density Asymmetric Supercapacitors

“…By constructing integrated hybrid electrodes, α-Fe 2 O 3 is directly deposited onto conductive skeletons of carbonaceous materials. Carbon nanotubes (Dong et al, 2018;Yue et al, 2018), porous carbon (Arun et al, 2019), and graphene (Xu et al, 2019) can overcome this vexing issue of low conductivity, which indeed demonstrates that integrated hybrid electrodes show better electrochemical performances than individual components because of the synergistic effect between the α-Fe 2 O 3 nanostructure and the carbon configurations. Thus, far, the unsatisfactory dispersion and small surface area of α-Fe 2 O 3 still causes a relatively low specific capacitance.…”

“…Carbon materials play a role as negative electrodes, using the electrical double layer to accumulate energy, while the specific capacitance is trapped at an intermediate level of 100-200 F g −1 (Zhu et al, 2011;Sahu et al, 2017;Wang et al, 2019). Recent studies have reported that pseudocapacitive anodes can deliver higher charge storage capacities than carbon materials, such as MoO 3 (Zhang et al, 2019), V 2 O 5 (Guo et al, 2015), WO 3 (Yun T. G. et al, 2019), TiN Sun et al, 2020, Fe 3 (Arun et al, 2019), FeOOH (Chen et al, 2016), and Fe 2 O 3 (Yun X. et al, 2019;Le et al, 2020;Zhang et al, 2020). Among them, α-Fe 2 O 3 is chosen as a potential candidate for ASCs because of its natural abundance, eco-friendly nature, excellent physicochemical stability, large theoretical capacitance (∼3,625 F g −1 ), and high hydrogen evolution potential in aqueous solution (Han et al, 2014;Nithya and Arul, 2016;.…”