Facile synthesis of cobalt fluoride (CoF₂)/multi-walled carbon nanotube (MWCNT) nanocomposites and improvement of their electrochemical performance as cathode materials for Li-ion batteries

Abstract

Conversion-type metal fluoride cathodes are considered promising candidates for electrochemical applications owing to their large specific capacities and high operating voltages. However, harnessing the potentially high energy-density of metal fluorides...

Surface Engineering of Anodic WO3 Layers by In Situ Doping for Light-Assisted Water Splitting

“…For the Co 2p peak (Figure B,D,F), across different samples, the primary signal after deconvolution, at energies of 781.2 eV (10 mM CoF 2 ), 781.8 eV (30 mM CoF 2 ), and 781.6 eV (100 mM CoF 2 ), could be attributed to the Co 2+ state. , Another notable peak at higher binding energies, above 783.0 eV, is related to the presence of Co–F bonds, identifiable as cobalt fluoride (CoF 2 ) . This interpretation is further supported by the main fluorine signal F 1s (Figure C,E,G) which displayed a maximum binding energy ranging from about 684.0 eV (100 mM) to about 687.5 eV (10 mM), confirming the presence of cobalt fluoride in the materials. − Similar to the findings of the EDS study (Figure F,G,H), an increase in the Co concentration was observed in correlation with the variation in the amount of CoF 2 added to the electrolyte. The Co content in the oxide layer ranged from 0.2 atom % (10 mM) to 0.3 atom % (100 mM).…”