Water-steam activation toward oxygen-deficient vanadium oxides for enhancing zinc ion storage

Abstract

A major limitation of vanadium oxides in aqueous Zn/V2O5 ion battery applications is that it suffers from strong Coulombic ion-lattice interactions with divalent Zn2+. Correspondingly, the vanadium oxides endow the...

Polyaniline-Intercalated Vanadium Dioxide Nanoflakes for High-Performance Aqueous Zinc Ion Batteries

“…The XRD result is consistent with the observation of layered structure from SEM measurement. Previous reports have shown that V 2 O 5 with some metal ion intercalation could display purely layered structure by adjusting the experimental parameters accurately, such as LiV 3 O 8 , Ca 0.25 V 2 O 5 , Mg x V 2 O 5 , and AlVO, delivering high energy density and reversibility. ,,,, Similar layered structures have been found for water and aniline molecular intercalated V 2 O 5 materials. ,,− Considering our experimental process and XRD results, it is reasonable to gain primary deduction that the intercalated PANI molecular causes layer spacing of the (001) plane of monoclinic VO 2 to be enlarged from 6.2 Å (14.4°) to 10.2 Å (at 8.7°). However, the phase of L-PANI-VO 2 could not be derived solely by XRD due to the high degree of preferred orientations.…”

Challenges and Strategies in the Development of Zinc‐Ion Batteries

“…[213,214] The oxygen vacancies were also stated to provide more electrons into the delocalized electron cloud for a higher capacity. [215] Wu et al employed a liquid-exfoliation technique to create a high concentration of oxygen vacancies in bilayer VOPO 4 ⋅2H 2 O (bilayer VOP). [212] Density functional theory showed that this improved conductivity due to the lowered bandgap of ≈0.2 eV (relative to 1.5 eV of the bulk sample) and improved kinetics by lowering the Zn 2+ diffusion energy barrier to ≈0.08 eV from 0.13 eV of the bulk sample when oxygen vacancies were introduced.…”

“…[ 213,214 ] The oxygen vacancies were also stated to provide more electrons into the delocalized electron cloud for a higher capacity. [ 215 ] Wu et al. employed a liquid‐exfoliation technique to create a high concentration of oxygen vacancies in bilayer VOPO 4 ⋅2H 2 O (bilayer VOP).…”

Electrochemically induced amorphous and porous VOx/N-doped carbon spheres as a cathode for advanced aqueous zinc-ion batteries

“…Particularly, vanadium-based oxides have captured con-siderable attention for ZIB cathodes benefiting from their rich valences and superior theoretical capacity. [20][21][22][23][24][25][26] For example, Yang et al reported that VO 2 (B) nanofibers with tunnel-like frameworks displayed a reversible capacity (357 mA h g −1 at 0.25 C upon 50 cycles). 7 Cheng et al reported that porous V 2 O 5 nanofibers exhibited a sustainable capacity (166 mA h g −1 at 2 C upon 500 cycles).…”