Sodium Ion Intercalation in Metal–Organic‐Framework‐Derived Porous V ₂ O ₅ Nanobelts Toward Durable and High‐Capacity Cathode Material for Aqueous Zinc‐Ion Batteries

ABSTRACT Vanadium (V)‐based composites are promising cathodes for aqueous zinc (Zn)‐ion batteries (AZIBs), but their low surface area, poor conductivity, and sluggish Zn 2+ diffusion severely limit performance. Here, metal–organic‐framework‐derived porous Na 0.33 V 2 O 5 (NVO) nanobelts (NBs) are synthesized by a simple hydrothermal route, with controlled sodium (Na) contents of 1, 3, and 5 wt%. Strong Na─O bonding with lattice oxygen reinforces the layered framework and stabilizes the structure during cycling. Among them, the NVO‐3wt% electrode delivers a high specific capacity of 650 mA h g −1 at 0.5 A g −1 , excellent rate capability (298 mA h g −1 at 32 A g −1 ), and outstanding long‐term durability with ∼85% capacity retention at 30 A g −1 after 20 000 cycles. Ex situ structural and spectroscopic analyses reveal a reversible mixed Zn 2+ /H + storage mechanism in NVO‐3wt%. In addition, flexible full cells are assembled using NVO‐3wt% cathodes, highlighting their strong potential for application in wearable AZIBs. Hence, this study holds significance for developing high‐performance V‐based electrodes for wearable AZIBs.