Work

Carboxymethyl Cellulose‐Induced Phase Transformation of Metal‐Organic Framework‐Derived Vanadium Oxides for High‐Rate and High‐Capacity Zinc Storage

Year: 2026

Type: article

Abstract: Conventional synthesis of metal oxides from metal‐organic frameworks (MOFs) precursors typically relies on high‐temperature pyrolysis, which inherits the structural advantages of MOFs but is energy‐intensive. Herein, we report a low‐energy hydrothermal transformation strategy to fabricate two phase‐pure vanadium oxides (VO 2 and V 3 O 7 ·H 2 O) without high temperature treatment. The tunnel‐structured VO 2 nanobelts with high oxygen vacancy defects can be obtained by the function of water‐soluble polymer sodium carboxymethyl cellulose (CMC), which plays a critical phase‐directing role by coordinating with released vanadium ions on the V‐MOF surface. As a cathode for aqueous zinc‐ion batteries (AZIBs), the VO 2 nanobelts deliver high specific capacities of 320.8 mAh g −1 at 0.1 g −1 and 242.2 mAh g −1 at 10 A g −1 , significantly outperforming the CMC‐free V 3 O 7 ·H 2 O counterpart (309.5 and 162.3 mAh g −1 ). Moreover, VO 2 exhibits a high‐capacity retention of 73.6% after 1400 cycles at 10 A g −1 . The enhanced electrochemical behavior arises from the synergistic effects of the tunnel structure, uniform nanobelt morphology, and abundant oxygen vacancies, which facilitate Zn 2+ diffusion and electronic conduction. This work not only provides a high‐performance VO 2 cathode for AZIBs but also establishes a general, low‐cost, and scalable hydrothermal route for phase‐engineered MOF‐derived metal oxides.

Source: ChemSusChem

DOI: 10.1002/cssc.71013