Abstract
A high reversible Li-ion storage capacity (200mAh/g) with C/10 rate and good rate capability is achieved in reduced graphene oxide (rGO) wrapped anatase mesoporous TiO2 nanofiber anodes fabricated by electrospinning. X-ray analysis of rGO wrapped TiO2 nanofibers confirmed the crystalline anatase structure of TiO2, while Raman spectroscopy established high frequency shift caused by the interaction of TiO2 with 2–4 layers of rGO. FT-IR analysis of rGO wrapped TiO2 nanofibers revealed disappearance of CC, CO, and COH stretching frequencies suggesting the successful reduction of GO to graphene, further confirmed by X-ray Photoelectron spectroscopy. The BET surface area of TiO2 nanofibers (54m2g−1) increased to 105m2g−1 after wrapping rGO leading to mesoporous structure with pore diameters 5–20nm, complementary observations with scanning and transmission electron microscopies. The oxidation/reduction peaks revealed lithium insertion and lithium extraction mechanism, from 1D TiO2 fibers with superior electrode/electrolyte contacts, with shorter Li-ion diffusion length and improved ionic conductivity. Successful anchoring of rGO on TiO2 nanofiber with Ti3+-C bonds energetically favors the electrochemical reaction yielding high rate and specific TiO2 capacity as a promising anode of lithium ion battery.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call