Abstract
? 2022 Elsevier B.V.The (NH4)2Co2V10O28·16H2O/(NH4)2V10O25·8H2O (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.
NSTL
Elsevier