Electrochemically Induced Phase Transition in V3 O7·H2O Nanobelts/Reduced Graphene Oxide Composites for Aqueous Zinc-Ion Batteries

Huili Cao*, Zhiyong Zheng, Poul Norby, Xinxin Xiao*, Susanne Mossin*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

V3O7·H2O nanobelts/reduced graphene oxide (rGO) composites (weight ratio: 86%/14%) are synthesized by a microwave approach with a high yield (85%) through controlling pH with acids. The growth mechanisms of the highly crystalline nanobelts (average diameter: 25 nm; length: ≈20 µm; oriented along the [101] direction) have been thoroughly investigated, with the governing role of the acid upon the morphology and oxidation state of vanadium disclosed. When used as the ZIB cathode, the composite can deliver a high specific capacity of 410.7 and 385.7 mAh g-1 at the current density of 0.5 and 4 A g-1 , respectively, with a high retention of the capacity of 93%. The capacity of the composite is greater than those of V3O7· H2O, V2O5 nanobelts, and V5O12 · 6H2O film. Zinc ion storage in V3O7·H2O/rGO is mainly a pseudocapacitive behavior rather than ion diffusion. The presence of rGO enables outstanding cycling stability of up to 1000 cycles with a capacity retention of 99.6%. Extended cycling shows a gradual phase transition, that is, from the original orthorhombic V3O7· H2 O to a stable hexagonal Zn3(VO4)2(H2O)2.93 phase, which is a new electrochemical route found in V3O7 materials. This phase transition process provides new insight into the reactions of aqueous ZIBs.
Original languageEnglish
Article numbere2100558
JournalSmall
Volume17
Issue number24
Number of pages10
ISSN1613-6810
DOIs
Publication statusPublished - 2021

Keywords

  • Microwave-assisted synthesis
  • Phase transition
  • Reduced graphene oxide
  • V3O7H2O nanobelts
  • Zinc-ion batteries

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