TiO2 modified FeS Nanostructures with Enhanced Electrochemical Performance for Lithium-Ion Batteries

Abstract

Anatase TiO2 modified FeS nanowires assembled by numerous nanosheets were synthesized by using a typical hydrothermal method. The carbon-free nanocoated composite electrodes exhibit improved reversible capacity of 510 mAh g−1 after 100 discharge/charge cycles at 200 mA g−1, much higher than that of the pristine FeS nanostructures, and long-term cycling stability with little performance degradation even after 500 discharge/charge cycles at current density of 400 mA g−1. Full batteries fabricated using the FeS@TiO2 nanostructures anode and the LiMn2O4 nanowires cathode with excellent stability, and good rate capacities could also be achieved. The enhanced electrochemical performance of the composite electrodes can be attributed to the improved conductively of the integrated electrodes and the enhanced kinetics of lithium insertion/extraction at the electrode/electrolyte interface because of the incorporation of anatase TiO2 phase.

Following the structure and reactivity of Tuncbilek lignite during pyrolysis and hydrogenation

“…While the quartz (2θ~26.8, 20.9, 50.4, 37.2, 39.7°) peaks remained uninfluenced after pyrolysis and hydrogenation, the kaolinite (2θ~12.5, 20.3, 24.9, 36.1, 38.6°)[46] peaks disappeared after the aforementioned processes. Appearance of Fe (110) peak at 2θ = 44.6°confirmed the elimination of pyrite to form metallic Fe during hydrogenation[47,48].…”

Cyclic Voltammetric Studies on the Role of Electrode, Electrode Surface Modification and Electrolyte Solution of an Electrochemical Cell

“…It has been a well established fact that the reduction and oxidation process in an electrochemical reaction are kinetic in nature. There is a systematic shift in the redox peak position with voltage scan rate in cyclic voltammetric measurements [18,19]. A theoretical model has been developed by Randles and Sevcik to predict how the peak current in reduction /oxidation process dependents on the voltage scan rate [20].…”

Effect of calcination on structural, morphological and photoelectrochemical performance of SnO2/TiO2 nanostructure films

“…6 reveal the effect of calcination temperature on impedance spectra of SnO 2 /TiO 2 nanostructure, indicating that the size of arc radius decreases rapidly with increasing calcination temperature. The lowest resistance can be observed in the sample calcined at 400°C which indicates that this electrode possess lower contact and charge-transfer impedances [45]. Therefore, the higher calcination temperature makes the nanostructure film less resistive which leads to an effective separation of photogenerated electron-hole pairs [44].…”