(NR4)2Co2V10O28•16H2O/(NR4)2V10O25•8H2O heterostructure as cathode for high-performance aqueous Zn-ion batteries

The (NR4)(2)Co2V10O28 center dot 16H(2)O/(NR4)(2)V10O25 center dot 8H(2)O (NCVO-NVO)-based heterostructure nanorods with a length that lies within the range of 800-1200 nm and a width of 150 nm was fabricated by enforcing a simple hydrothermal method. In this structure, the ammonium ion and water enlarge the interlayer distance of the layered vanadium-oxide and at the same time promote the insertion/extraction of Zn2+ into the layered structure without imposing any volume change. In addition, the internal electric field built at the heterointerface of the NCVO-NVO-based heterostructure can facilitate the Zn2+ diffusion and improve the reaction kinetics. On top of that, when is exploited as cathode material in aqueous Zn-ion batteries (AZIBs), the NCVO-NVO electrode presents a relatively high discharge capacity (367.7 mAh g(-1) at 0.1 A g(-1)) in combination with an excellent cycling performance (201.3 mAh g(-1) after 1000 cycles at 1.0 A g(-1) with an enhanced capacity retention of 82.1%). The enormous potential of the fabricated vanadium-oxide heterostructure cathode is indicated in this work to develop for AZIBs with improved properties. (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

Heterostructure nanorods based on NCVO-NVO were fabricated using a simple hydrothermal method, displaying high discharge capacity and excellent cycling performance in aqueous Zn-ion batteries.