Innovative 2D dioxonium vanadium oxide: enhancing stability in aqueous zinc-ion battery cathodes.

Autor: De Luna Y; Materials Science and Technology Graduate Program, Department of Physics and Materials Science, Qatar University Doha 2713 Qatar., Mohamed Z; Faculty of Applied Science, Universiti Teknologi MARA 40450 Shah Alam Selangor Malaysia., Dawoud A; Department of Chemistry and Earth Sciences, College of Arts and Science, Qatar University PO Box 2713 Doha Qatar nasr.bensalah@qu.edu.qa., Bensalah N; Department of Chemistry and Earth Sciences, College of Arts and Science, Qatar University PO Box 2713 Doha Qatar nasr.bensalah@qu.edu.qa.
Jazyk: angličtina
Zdroj: RSC advances [RSC Adv] 2024 Dec 11; Vol. 14 (53), pp. 39193-39203. Date of Electronic Publication: 2024 Dec 11 (Print Publication: 2024).
DOI: 10.1039/d4ra06871h
Abstrakt: Vanadium oxide-based compounds have attracted significant interest as battery materials, especially in aqueous Zn-ion batteries, due to favorable properties and compatibility in Zn-ion systems. In a simple hydrothermal method with moderate conditions, a novel vanadium oxide compound has been synthesized using ammonium metavanadate with oxalic acid as a reducing agent. Various characterization techniques confirmed the formation of layered V 3 O 8 (H 3 O) 2 nanoplatelets with a tetragonal crystal structure. The as-prepared cathode material was tested in coin cells against a Zn metal anode in two aqueous electrolytes of the same concentration: ZnSO 4 ·7H 2 O and Zn(CF 3 SO 3 ) 2 . Electrochemical results showed high reversibility of Zn insertion/de-insertion and impressive cycling stability with aqueous Zn(CF 3 SO 3 ) 2 electrolyte. Notably, the cathode material delivered a specific capacity of 150 mA h g -1 at 100 mA g -1 and a relatively constant coulombic efficiency near 100%, indicating impressive stability during cycling and reversibility of charge/discharge electrochemical reactions. Post-mortem characterization exposed a significant structural change in the as-prepared cathode material from nanoplatelets to nanoflakes after full discharge, which reverted to nanoplatelets after charging, reflecting the high level of reversibility of the material. DFT calculations revealed a structural change in the material after cycling, providing mechanistic insights in Zn 2+ -ion storage.
Competing Interests: The authors declare no conflict of interest.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
Externí odkaz: