▎ 摘　　要

Vanadium-based oxides have attracted much attention due to their open framework structure and multiple oxygen coordination polyhedral. Herein, the novel hydrated vanadates (CaV8O20 center dot 3 H2O) nanoribbons with graphene are prepared, which are used as a cathode material for aqueous zinc-ion batteries (AZIBs). Specifically, Ca-ion and crystal water as a pillar enhance the layered frameworks stability and decrease the electrostatic interaction with Zn2+. Meanwhile, the introduction of graphene is helpful to further strengthen the electrical conductivity and fast electron transfer. Most importantly, the amount of graphene oxides (GO) precursor would induce the structural transitions of oxygen coordination polyhedral (CaV6O16 center dot 3 H2O to CaV8O20 center dot 3 H2O). Benefiting from the combination of interlayer and structure engineering strategy, the optimized CaVO-40 0 not only offers a high reversible capacity (290.9 mAh g-1 at 1 A g-1 after 100 cycles) but exhibits a good cycling performance (56.4 mAh g-1 at 3 A g-1 after 10000 cycles). Especially, the CaVO-400 shows a superior rate capability (197.9 mAh g-1 at 10 A g-1). Furthermore, through the detailed phase transition and kinetics analysis, we studied the Zn2+/H+ insertion/extraction mechanism behind the good electrochemical performance. Accordingly, this work provides a reasonable strategy for the study of Vanadium-based oxides cathode materials for AZIBs.(c) 2023 Elsevier B.V. All rights reserved.