Du Yanyan, Wang Yongkang, Yang Beibei, Liu Xiao, Li Congcong, Li Wenbin, Zhang Panpan, Lu Hongbin, Bin Duan, Xia Yongyao
School of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, China.
School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China.
Nano Lett. 2025 Jan 22;25(3):1002-1009. doi: 10.1021/acs.nanolett.4c04752. Epub 2025 Jan 13.
Vanadium-based oxides have garnered significant attention for aqueous zinc batteries (AZBs), whereas sluggish Zn 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 FeVO and FeVO 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 at 0.6 A g, excellent rate capability (252.3 mAh g, 80 A g), and superior long-term cycling performance (95% capacity retention over 12 000 cycles at 40 A g). This work presents a reasonable strategy for engineering heterostructure materials for AZB application.
钒基氧化物在水系锌电池（AZB）领域引起了广泛关注，然而，缓慢的锌扩散和结构坍塌仍是实现高性能阴极的主要挑战。在此，通过调节钒含量制备了不同结构的铁钒氧化物。研究发现，由FeVO和FeVO混合相组成的多孔莫特-肖特基异质结用于构建自生的FeVO-5结构，该结构可降低扩散势垒并改善源自界面处形成的内建电场的电子传输，与单相FeVO-1相比，表现出更快的反应动力学和更高的容量。令人惊讶的是，FeVO-5阴极在0.6 A g下具有高达431 mAh g的可观容量、出色的倍率性能（252.3 mAh g，80 A g）以及优异的长期循环性能（在40 A g下12000次循环后容量保持率为95%）。这项工作为水系锌电池应用的异质结构材料工程提供了合理策略。
