Vanadate ion promoting the transformation of a-phase molybdenum trioxide (a-MoO3) to h-phase MoO3 (h-MoO3) for boosted Zn-ion storage
JOURNAL OF COLLOID AND INTERFACE SCIENCE(2023)
摘要
Molybdenum trioxide (MoO3) has been widely studied in the energy storage field due to its various phase states and unique structural advantages. Among them, lamellar a-phase MoO3 (alpha-MoO3) and tunnel-like h-phase MoO3 (h-MoO3) have attracted much attention. In this study, we demonstrate that vanadate ion (VO3-) can transform a-MoO3 (a thermodynamically stable phase) to h-MoO3 (a metastable phase) by altering the connection of [MoO6] octahedra configurations. h-MoO3 with VO3- inserted (referred to as h-MoO3-V) as the cathode material for aqueous zinc ion batteries (AZIBs) exhibits excellent Zn2+ storage performances. The improvement in electrochemical properties is attributed to the open tunneling structure of the h-MoO3-V, which offers more active sites for Zn2+ (de)intercalation and diffusion. As expected, the Zn//h-MoO3-V battery delivers specific capacity of 250 mAh.g (-1) at 0.1 A.g(- 1) and rate capability (73% retention from 0.1 to 1 A.g (-1), 80 cycles), well exceeding those of Zn//h-MoO3 and Zn//alpha-MoO3 batteries. This study demonstrates that the tunneling structure of h-MoO3
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关键词
MoO3, Vanadate ion, Phase transformation, Aqueous zinc ion batteries, Cathode material
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