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Vanadium-based oxides have garnered significant attention for aqueous zinc batteries (AZBs), whereas sluggish Zn2+ diffusion and structural collapse remain major challenges in achieving high-performance cathodes. Herein, different structures of iron–vanadium oxides were fabricated by modulating the amount of vanadium content. It is found that the porous Mott–Schottky heterojunction composed of Fe0.12V2O5 and Fe2V4O13 mixed phase was used to construct a self-generated FeVO-5 structure, which could lower the diffusion barrier and improve the electron transport derived from the formed built-in electric field at the interface, showing faster reaction kinetics and improved capacity compared with the singe-phase FeVO-1. Surprisingly, the FeVO-5 cathode delivers an impressive capacity of up to 431 mAh g–1 at 0.6 A g–1, excellent rate capability (252.3 mAh g–1, 80 A g–1), and superior long-term cycling performance (95% capacity retention over 12 000 cycles at 40 A g–1). This work presents a reasonable strategy for engineering heterostructure materials for AZB application.
Du et al. (Mon,) studied this question.