In situ construction of N-doped Ti₃C₂T _x confined worm-like Fe₂O₃ nanoparticles by Fe–O–Ti bonding for LIBs anode with superior cycle performance

Abstract

The development of Fe2O3 as lithium-ion batteries (LIBs) anode is greatly restricted by its poor electronic conductivity and structural stability. To solve these issues, this work presents in situ construction of three-dimensional crumpled Fe2O3@N-Ti3C2Tx composite by solvothermal-freeze-drying process, in which wormlike Fe2O3 nanoparticles (10 ~ 50 nm) in situ nucleated and grew on the surface of N-doped Ti3C2Tx nanosheets with Fe-O-Ti bonding. As a conductive matrix, N-doping endows Ti3C2Tx with more active sites and higher electron transfer efficiency. Meanwhile, Fe-O-Ti bonding enhances the stability of the Fe2O3/N-Ti3C2Tx interface and also acts as a pathway for electron transmission. With a large specific surface area (114.72 m2 g-1), the three-dimensional crumpled structure of Fe2O3@N-Ti3C2Tx facilitates the charge diffusion kinetics and enables easier exposure of the active sites. Consequently, Fe2O3@N-Ti3C2Tx composite exhibits outstanding electrochemical performance as anode for LIBs, a reversible capacity of 870.2 mAh g-1 after 500 cycles at 0.5 A g-1, 1129 mAh g-1 after 280 cycles at 0.2 A g-1 and 777.6 mAh g-1 after 330 cycles at 1 A g-1.

Integration of Magnetic-Field-Directed Self-Assembly-Based Cell Culture and Biosensing Platform for Improving hPSCs-Derived Neurons and Quantitative Detection of Neurotransmitter

“…The Ti–O–Fe covalent linkage is situated at 458.3 and 464.2 eV, confirming a robust interaction. Similar evidence is also discernible in the O 1s spectrum (Figure F), where a peak at 530.3 eV, corresponding to Fe–O–Ti bond, was observed . Additionally, peaks at 529.7 eV (Ti–O), 530.0 eV (Fe–O), 530.9 eV (C–Ti–O), and 531.9 eV (C–Ti–OH) were observed .…”

“…Similar evidence is also discernible in the O 1s spectrum (Figure 1F), where a peak at 530.3 eV, corresponding to Fe−O−Ti bond, was observed. 30 The maximum signal intensity was attained at 25 μg/mL M/F (Figure S3). To address the potential influence of M/F concentration on cell culture, we opted for 25 μg/mL M/F for the subsequent experiments.…”