Flower-like Fe2O3/reduced graphene oxide composite for electrochemical energy storage

Abstract

Fe 2 O 3 /reduced graphene oxide composite (FFGC) was fabricated by a hydrothermal method for the exploration of electrochemical energy storage, where the Fe 2 O 3 nanoparticles (NPs) loaded onto the surface of reduced graphene oxide (rGO) sheet uniformly. Interestingly, the TEM image showed that visible micro-cracks were appeared on the surface of flower-like Fe 2 O 3 NP, which did not interfere with its stably crystalline structure. Herein, FFGC was investigated as anode material for lithium-ion battery (LIB) as well as electrode material for supercapacitor (SC). For instance, the specific discharge capacity was of 1366 mAh g-1 at 0.1 A g-1 in LIB case, while the specific capacitance of 318.9 F g-1 at 0.1 A g-1 in SC experiment. On the other hand, FFGC exhibited the excellently steady performance in either LIB or SC experiment. Those results suggest the roseate future of FFGC in the application of energy issues.

Core‐Shell Architectured Sulfur Coated α‐Fe2O3 Nano‐Sheet Anode for Li‐Ion Battery with Insitu Active Solid Electrolyte Interfacial Layer and Li‐Sulfur Energy Storage Systems

“…The sharp and distinct diffraction peaks (2θ) observed at 24.138°, 33.153°, 35.612°, 39.277°, 40.855°, 49.480°, 54.09°, 57.59°, 62.45°, 63.991°, 69.60°, 71.937°, and 75.431°in both the XRD patterns of bare α-Fe 2 O 3 and α-Fe 2 O 3 @S-2 are corresponding to crystallographic planes (012), (104), (110), (006), ( 113), (024), ( 116), (018), (214), (300), ( 208), (1010), and (220) of α-Fe 2 O 3 respectively (ICDD: 00-033-0664). [36][37][38] Whereas the XRD pattern of α-Fe 2 O 3 @S-1 shows slightly different diffraction peaks (2θ) as observed at 35.612°, 39.277°, 40.855°, 54.09°, 57.59°and 69.60°w hich are corresponding to crystallographic planes of (110), (006), ( 113), ( 116), ( 018) and (208), respectively for α-Fe 2 O 3 . The observed diffraction peaks of α-Fe 2 O 3 @S-1 are in best match with ICDD: 00-033-0664, which corresponds to the development of the rhombohedral crystal structure of pristine α-Fe 2 O 3 within which the Fe 3 + cation occupies 2/3 octahedral sites in closepacked oxygen lattice and crystallize in R3c space group.…”

“…In order to visualize the low angle reflection planes, the XRD plot is magnified in the 2(θ) range of 10 ○ to 40 ○ . The magnified XRD pattern indicates two slight humps at 64.5° and 85.2° in the FB and FS1 electrodes which are corresponding to the (300) and (134) reflection planes due to the rhombohedral phase of α‐Fe 2 O 3 (ICDD: 00‐033‐0664) [36–38] . In the FB electrode, less intense peaks observed at 56.34 ° , 67.27 ° , and 83.83 ° are corresponding to (220), (311), and (400) reflection planes which might be due to the Li 2 O cubic phase (ICDD card No: 00‐012‐0254) [78] .…”

“…The magnified XRD pattern indicates two slight humps at 64.5°a nd 85.2°in the FB and FS1 electrodes which are corresponding to the (300) and (134) reflection planes due to the rhombohedral phase of α-Fe 2 O 3 (ICDD: 00-033-0664). [36][37][38] In the FB electrode, less intense peaks observed at 56.34°, 67.27°, and 83.83°are corresponding to (220), (311), and (400) reflection planes which might be due to the Li 2 O cubic phase (ICDD card No: 00-012-0254). [78] The formation of Li 2 O in the FB electrode may be due to the capture of mobile lithium ions by oxygen anions arise from the decomposition of electrolyte components as well as surface-adsorbed oxygen of the electrode.…”

WO3 Quantum Dots Decorated GO/Mg‐doped ZnO Composites for Enhanced Photocatalytic Activity under Nature Sunlight

“…Using semiconductors with optical storage capability (such as WO 3 , SnO 2 , MoO 3 , and Fe 2 O 3 ) can endow the traditional catalytic materials (TiO 2 and ZnO) with optical memory characteristic . Among these semiconductors, WO 3 as a narrow band gap (2.4–2.8 eV) n‐type semiconductor has been deemed as a promising nanomaterial in practical application sowing to non‐toxic, low cost, excellent stability and visible light response .…”

A corn-inspired structure design for an iron oxide fiber/reduced graphene oxide composite as a high-performance anode material for Li-ion batteries

“…To overcome these drawbacks, several strategies have been employed such as Fe 2 O 3 nanotubes, nanorods/rGO, nanoropes/rGO, hollow nanobarrels, hollow nanoparticles/rGO, hollow spheres, and hollow-structured tubular nanostructures. [17][18][19][20][21][22][23][24][25][26][27][28] Chaudhari et al 26 reported a hollow-structured a-Fe 2 O 3 nanobers electrode with a reversible capacity of 1293 mA h g À1 at a current density of 60 mA g À1 . Fe 2 O 3 hollow nanoparticles/N-doped graphene aerogels were prepared by Liu et al, 27 and the grapheme/Fe 2 O 3 aerogels exhibit high rate capability and excellent cyclic stability (729 mA h g À1 at 0.1 A g À1 for 300 cycles).…”