Electrochemically Induced Phase Transition in V <sub>3</sub> O <sub>7</sub> · H <sub>2</sub> O Nanobelts/Reduced Graphene Oxide Composites for Aqueous Zinc‐Ion Batteries
نویسندگان
چکیده
V3O7·H2O nanobelts/reduced graphene oxide (rGO) composites (weight ratio: 86%/14%) are synthesized by a microwave approach with high yield (85%) through controlling pH acids. The growth mechanisms of the highly crystalline nanobelts (average diameter: 25 nm; length: ≈20 µm; oriented along [101] direction) have been thoroughly investigated, governing role acid upon morphology and oxidation state vanadium disclosed. When used as ZIB cathode, composite can deliver specific capacity 410.7 385.7 mAh g−1 at current density 0.5 4 A g−1, respectively, retention 93%. is greater than those V3O7 · H2O, V2O5 nanobelts, V5O12 6H2O film. Zinc ion storage in V3O7·H2O/rGO mainly pseudocapacitive behavior rather diffusion. presence rGO enables outstanding cycling stability up to 1000 cycles 99.6%. Extended shows gradual phase transition, that is, from original orthorhombic H2O stable hexagonal Zn3(VO4)2(H2O)2.93 phase, which new electrochemical route found materials. This transition process provides insight into reactions aqueous ZIBs.
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ژورنال
عنوان ژورنال: Small
سال: 2021
ISSN: ['1613-6829', '1613-6810']
DOI: https://doi.org/10.1002/smll.202100558