A facile route to achieve ultrafine Fe2O3 nanorods anchored on graphene oxide for application in lithium-ion battery

Biological Metabolism Synthesis of Metal Oxides Nanorods from Bacteria as a Biofactory toward High‐Performance Lithium‐Ion Battery Anodes

“…In the first cycle, a well‐defined reduction peak located at ≈0.6 V is observed during the cathodic scanning, which is attributed to the Li + insertion into the crystal structure of Fe 2 O 3 and the reduction of Fe 2 O 3 (Fe 2 O 3 + 6 Li + + 6 e − ↔ 2 Fe + 3Li 2 O) as well as the formation of SEI layer . Meanwhile, a broad oxidation peak at ≈1.7 V in the first anodic scan is mainly ascribed to the two‐step oxidation process of Fe 0 to Fe 2+ and Fe 2+ to Fe 3+ . From the second cycle onward, the reduction peak shifts distinctly to the higher potential of ≈0.9 V, implying that the kinetics of the reduction process of Fe 3+ to Fe 0 are improved after the structure realignment and electrochemical activation during the first cycle .…”

“…However, restricted by dramatic volume expansion rate, low electronic conductivity, and unstable solid electrolyte interphase (SEI), α‐Fe 2 O 3 suffers rapid capacity fading during the long‐term cycling and inferior rate capability under high‐current charge–discharge processes . So far, one effective approach to improve the cycle life and rate performance is to rationally design and fabricate delicate nanostructured α‐Fe 2 O 3 that can not only shorten Li + diffusion pathways but also alleviate volume expansion . Although a variety of nanostructured α‐Fe 2 O 3 including nanorods, nanowires, nanotubes, nanosheets, nanospheres, and nanoparticles are widely verified to overcome the aforementioned issues in the past decades, the conventional physical/chemical synthetic methods extensively involve complex chemical reactions, high hazardous and expansive reagents, and high energy and time consumption, which is a huge challenge for the large‐scale application of nanostructured α‐Fe 2 O 3 anodes in LIBs.…”

Fe-ZIF@C with Porous Nanostructure as Anode Material for Lithium-Ion Batteries

“…According to the BET and BJH results, it was found that Fe-ZIF@C had a higher specific surface area and smaller pore size, the latter of which can shorten the diffusion distance of lithium ions. [23][24][25] The carbon introduced by Fe-ZIF@C can not only increase the specific surface area of the material but also provide more active sites for embedding of lithium ions and improve the electrochemical properties. [26][27][28] Figure 5 shows the CV profiles of commercial a-Fe 2 O 3 , Fe-ZIF, and Fe-ZIF@C electrodes for the initial three cycles.…”

Effects of size on the photocatalytic properties of high-index faceted pseudocubic and rhombohedral α-Fe2O3 nanocrystals

“…34-1266) was completely transformed into to α-Fe 2 O 3 through the hydrothermal treatment under different initial pHs. 36 The average crystallite sizes of α-Fe 2 O 3 nanocrystals prepared at pH values of 1.2, 2.0, 4.0, and 6.0 were 50.61, 42.92, 39.99, and 37.06 nm, respectively, which were calculated by Scherrer formula. 37 The result demonstrates the crystallite size of the sample decrease with the increasing of precursor pH value.…”